# PayAPI Market

> PayAPI Market is a pay-per-call API marketplace built on the x402 payment protocol, designed for AI agents to discover and pay for APIs autonomously using USDC on Base.

Last updated: 2026-09-11

## What is PayAPI Market?

PayAPI Market is a marketplace where API providers list their services and AI agents discover and pay for them automatically, per request, in USDC on Base via the x402 protocol (HTTP 402 Payment Required). No API keys, no accounts, no monthly subscriptions are required for buyers. There is no per-request fee: providers keep 100% of what the call earns, paid agent to wallet via the CDP Facilitator. Listing is free.

```json
{
  "name": "PayAPI Market",
  "url": "https://payapi.market",
  "category": "API Marketplace",
  "founder": "Chet Parker",
  "founded": "2026",
  "payment_protocol": "x402",
  "discovery_protocol": "MCP",
  "settlement_currency": "USDC",
  "settlement_chain": "Base",
  "provider_revenue_share": "100%",
  "live_apis": 147,
  "total_endpoints": 983,
  "providers": 79,
  "settlement_verified": 130,
  "settlement_verified_independent": 121,
  "settlement_verified_first_party": 9,
  "independent_verified_providers": 69,
  "price_range_usdc": "$0.001-$16.701",
  "verified_price_range_usdc": "$0.001-$16.701"
}
```

## What it is

- A marketplace for APIs where the buyers are autonomous AI agents
- Discovery via MCP: https://payapi.market/mcp exposes the whole catalogue as free search/list/get tools (stateless streamable HTTP)
- Discovery via HTTP: /agent/search, /agent/list, /agent/get, and /openapi.json
- Payment via x402 (USDC settlement on Base, under 1 second finality)
- Free listing, no per-request fee: providers keep 100% of what the call earns

## What it is NOT

- Not a subscription service for buyers
- Not an API key / OAuth gateway
- Not RapidAPI, it is designed specifically for AI agents, not human developers

## Who it's for

- API providers monetising for the agent economy
- AI agents (Claude Desktop, Cursor, custom agents) that need real-time data
- Developers turning expertise into passive USDC revenue
- Enterprises replacing £15K/year data subscriptions with pay-per-request

## What "settlement-verified" means

A settlement-verified badge means the marketplace operator paid that listing from its own wallet and got real product back, and there is an on-chain USDC transaction on Base behind the claim that you can check yourself. It is not a heuristic score. Listings without the badge are live and answer a valid x402 payment challenge, but have not yet been settlement-verified.

## How payments work

1. AI agent calls an x402-enabled endpoint
2. Server responds with HTTP 402 and a signed payment requirement (amount + wallet address)
3. Agent signs a USDC transfer on Base and retries the request
4. Server verifies the on-chain payment and returns the response
5. Provider receives USDC directly (100% of the payment)

## Key URLs

- Homepage: https://payapi.market/
- Marketplace (browse all APIs): https://payapi.market/marketplace
- How an agent finds and pays a route (with the reliability object): https://payapi.market/how-an-agent-finds-payapi
- For AI Agents: https://payapi.market/agents
- For API Providers: https://payapi.market/providers
- For Developers: https://payapi.market/developers
- For Enterprise: https://payapi.market/enterprises
- Pricing: https://payapi.market/pricing
- Revenue Calculator: https://payapi.market/calculator
- About: https://payapi.market/about
- Blog: https://payapi.market/blog
- Blog post, what the verified badge means: https://payapi.market/blog/the-badge-is-a-receipt
- Blog post, a worked morning in a buyer agent: https://payapi.market/blog/agents-pay-other-machines
- List your API: https://payapi.market/list
- Sitemap: https://payapi.market/sitemap.xml

## Live catalogue

147 live APIs across 983 endpoints from 79 providers. Of these, 130 are settlement-verified: a real on-chain USDC payment settled on Base for a real product response, checkable by anyone. 121 come from independent providers (69 of them); the other 9 are first-party APIs operated by PayAPI Market, labelled as such and counted separately.

Price range across live listings: $0.001-$16.701 USDC per request. Across settlement-verified listings: $0.001-$16.701 USDC.

### 10x402 [settlement-verified]
- Provider: 10x402 | Category: Verification | Price: $0.004-$0.12 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- x402 conformance lint for sellers: 82 regime-labeled, source-cited checks against your live 402 (envelope, dual-stack, Bazaar metadata), grade + bazaar_ready verdict. USDC on Base and Solana, $0.004-$

### 402Signal [settlement-verified]
- Provider: Ross | Category: Verification | Price: $0.003 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Independent x402 route discovery and live verification across Base, Solana and Algorand. Returns payment terms and evidence. $0.003 only when a valid live route is found. Independent pre-spend check…

### Aegis by Boris Inc [settlement-verified]
- Provider: Boris Inc | Category: Verification | Price: $0.005-$0.25 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Verify any x402 service before you pay it. Aegis probes the service, confirms it actually delivers, and returns a proof-backed trust score - so agents never pay a dead endpoint.

### AeroCheck [settlement-verified]
- Provider: LoneStarOracle | Category: Verification | Price: $0.05 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Risk scanner for Aerodrome and Uniswap v2 pools on Base. Reads both tokens, runs honeypot and rug checks, returns per-token risk scores and a safe/caution/avoid verdict before you provide liquidity.

### Agent Mercantile [settlement-verified]
- Provider: Agent Mercantile | Category: Tools | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- x402 utilities for AI agents: VM01 public-URL context, VM02 Base ERC-20 allowance exposure, VM04 Aave V3/Lido rate snapshots. $0.01/call. No API key, custody, signing, trading or investment advice.

### Agent Utility Network (AveDaris) [settlement-verified]
- Provider: AveDaris | Category: Data | Price: $0.001-$0.04 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- 23 machine-to-machine utilities for autonomous agents with x402 V2 payment on Base USDC, including JSON repair and validation, normalization, DNS and web intelligence, composite data workflows, machi…

### Agent402.Tools [settlement-verified]
- Provider: Agent402.Tools | Category: Tools | Price: $0.001-$3.3 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Pay-per-call tools for agents. Prices and catalog size come from https://agent402.tools/api/pricing and can change.

### AGENTUM Taxas Brasil [settlement-verified]
- Provider: AGENTUM LTDA | Category: Finance | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Official Brazilian reference rates in a single call, for agents doing arithmetic in BRL: the Selic target rate per year, the CDI rate per day, and the commercial US dollar selling rate, each returned…

### Anicca x402 Agent APIs [settlement-verified]
- Provider: Anicca | Category: Intelligence | Price: $0.005-$0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Nine x402-native AI utilities: context compression, emotion detection, Buddhist counsel, focus coaching, habit design, prompt safety, decision clarity, intent routing, and live funding rates.

### API Acre [settlement-verified]
- Provider: API Acre | Category: Tools | Price: $0.001-$0.25 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- 61 account-free x402 v2 APIs for deterministic code, document, web, public-record and Base data tasks, with OpenAPI, MCP, A2A and exact USDC pricing.

### Autocash Text Metrics [settlement-verified]
- Provider: Benjamin Dorey | Category: Data | Price: $0.001 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Deterministic text metrics for AI agents: character/word/sentence counts, Flesch reading ease, Flesch-Kincaid grade, top word frequency, reading time. Pure heuristics, no LLM. POST /v1/metrics with JS

### Bankruptcy Filing Search & Chapter 11 Dockets API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search CourtListener RECAP bankruptcy dockets by chapter, debtor or case keyword, court, docket number, and filing date for restructuring leads, insolvency monitoring, legal research, and credit-risk…

### Brazil CNPJ Business Verification API [settlement-verified]
- Provider: AGENTUM LTDA | Category: Data | Price: $0.02 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Verify and enrich Brazilian companies by CNPJ with structured registration data from public sources. Pay-per-request via x402 in USDC on Base. No API key required.

### Broken Link Checker, 404 Audit & Link Rot API [settlement-verified]
- Provider: AutoScrape | Category: Tools | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Extract and check unique links, images, scripts, and stylesheets from a web page for broken URLs, 404s, redirects, TLS failures, and link rot. Static-HTML, point-in-time HTTP evidence only: no recurs…

### Building Permits Roof Age Solar AHJ Evidence API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Official-source building-permit search for contractor leads plus roof-age, property-insurance permit history, solar/AHJ coverage QA, P&C underwriting, COPE permit evidence, and permit source-drift ch…

### Bulk Email Validation & Verification API [settlement-verified]
- Provider: AutoScrape | Category: Verification | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Bulk email validation for lead-list cleaning, CRM cleanup, syntax checks, MX lookup, and disposable-domain signals. Returns stable source and interpretation fields for up to 100 addresses per request…

### Bulk HTTP Status Checker & Redirect API [settlement-verified]
- Provider: AutoScrape | Category: Tools | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Check HTTP status codes, redirects, final URLs, response times, and request errors for up to 100 public URLs. GET or POST. Deterministic test: urls=https://example.com&maxResults=1. Point-in-time HTT…

### Butterfly Delta Exact-Order Preflight [settlement-verified]
- Provider: Butterfly Delta | Category: Finance | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Signed exact-order depth, spread, slippage, freshness, and venue-state preflight for Coinbase and Gemini crypto trading agents. Returns PASS/BLOCK/UNKNOWN before order placement.

### California Contractor License Lookup & Verification API [settlement-verified]
- Provider: AutoScrape | Category: Verification | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Official California CSLB contractor-license evidence for license lookup, contractor onboarding, and compliance review. Search by license number, business name, or personnel name; receive source-repor…

### ChainVerdict [settlement-verified]
- Provider: Alexander Balieu | Category: Verification | Price: $0.001-$0.1 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Pre-payment checks for agents: token safety and wallet risk on Base, on-chain payment verification, IBAN/VAT/BIC/LEI/ISIN validation, TLS and email posture. Signed answers with evidence and limits.

### Cloud World Model [settlement-verified]
- Provider: Kevin Brown | Category: Tools | Price: $0.001-$0.005 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Simulate cloud infrastructure changes, traffic, scaling and failures before deployment. Model cost, performance and reliability across AWS, Azure, GCP, OCI and DigitalOcean.

### CMS Nursing Home Care Compare, Ratings & Staffing API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search official CMS Care Compare nursing home records by facility, state, exact CCN, overall rating, or ownership type. Returns source-linked ratings, staffing, inspections, deficiencies, fines, owne…

### Cognilode Agent Security Scorer [settlement-verified]
- Provider: Cognilode | Category: Verification | Price: $0.02 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Deterministic security scoring for an agent configuration together with a block of untrusted content. POST /api/x402/agent-security-score returns a risk score and level, located findings that cite th…

### Cognilode Ticket Resale Underwriter [settlement-verified]
- Provider: Cognilode | Category: Finance | Price: $0.005 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Pay-per-call ticket resale underwriting for break-even, safe buy ceiling, net profit, ROI, downside, liquidity, and ranked buy/no-buy decisions.

### Compute Revenue Gateway [settlement-verified]
- Provider: 三流 (Sanliu) | Category: Finance | Price: $0.001 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- GPU compute economics for agents. POST /api/gpu-profitability returns gross, rental, electricity and net USD per GPU-hour plus margin percent and a break-even flag from your revenue, rental, power dr…

### Congress Stock Trades & Financial Disclosures API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search official House and Senate financial disclosure filings by member, chamber, filing year and type, with Periodic Transaction Reports plus annual holdings, transaction summaries, income, and liab…

### Contract Powers [settlement-verified]
- Provider: Operated by Ofir Baranes - no legal entity | Category: Verification | Price: $0.05 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Contract Powers: pay $0.05 per address, get the privileged powers its admin retains - upgrade, mint, pause, blacklist, fees, sweep - each with on-chain evidence, plus proxy type and bounty coverage.

### Council of AI GSPC — EU Evidence Feed [settlement-verified]
- Provider: CSOAI Ltd | Category: Data | Price: $0.02 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Signed EU AI Act / Art.50 marking evidence per request: a 402 challenge, then signed marking evidence delivered on settlement. Positive USDC per call; verify free. Measure, never certify. Verified on…

### CourtListener Legal Opinions & Case Law API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search CourtListener legal opinions and case law by full text, court, filing date, citation, docket number, or source-reported status for precedent research, litigation analysis, and legal research w…

### Crypto Snapshot Pro - AI Trading Signals [settlement-verified]
- Provider: Vitali Matros | Category: Finance | Price: $0.025 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- AI crypto trading signals: entry, target, stop, risk/reward, conviction. Pay per request via x402 in USDC on Base.

### CSV Drift Evidence [settlement-verified]
- Provider: Foundry | Category: Data | Price: $0.015 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Detect pipeline and schema drift by comparing baseline and candidate CSVs for added, removed or reordered columns, type changes, missing-rate shifts and optional numeric excursions. JSON evidence.

### Currency & Crypto API [settlement-verified · first-party]
- Provider: PayAPI Market | Category: Data | Price: $0.001 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- 5 endpoints for fiat and crypto pricing: latest ECB exchange rates for any base currency, fast amount conversion, historical rates back to 1999, single-coin crypto price lookup, and batch crypto pric…

### Dallas County Property Tax Records & Assessed Value API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search the Dallas County Tax Office public property-tax portal by exact account number, owner name, or street/address. Returns bounded source-linked evidence including owner as displayed, property ad…

### DELTA Witness [settlement-verified]
- Provider: DELTA Witness | Category: Verification | Price: $0.03 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Preflight an autonomous action before taking it: fetches a public URL, compares the live observation against deterministic expectations you supply, and returns a safe/unsafe verdict naming exactly wh…

### DELTA Witness Capture [settlement-verified]
- Provider: Ruphus Sten Studio | Category: Verification | Price: $0.03 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Timestamped page-state proof for a public web page. POST /v1/capture drives a real browser, captures the page, and returns a proof id plus a publicly resolvable manifest carrying per-artifact SHA-256…

### Diagram Generation API [settlement-verified]
- Provider: James White | Category: Tools | Price: $0.05-$0.07 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- AI-powered diagram generation API that renders Mermaid, D2, PlantUML, and Graphviz diagrams to SVG or PNG.

### DNS & Domain Intelligence API [settlement-verified · first-party]
- Provider: PayAPI Market | Category: Intelligence | Price: $0.002 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- 5 endpoints for DNS and domain intelligence: every common record type (A, AAAA, MX, TXT, NS, SOA, CNAME), WHOIS registration metadata, live SSL certificate inspection (issuer, validity, SANs, days re…

### Dokimo Verify API [settlement-verified]
- Provider: Augaster | Category: Verification | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Independently verifies a Merkle evidence proof to its committed root and returns a signed attestation - from Dokimo, a non-custodial ASC-606 subledger for x402/agent revenue.

### DOL Form 5500 401(k) & Employee Benefit Plan Leads API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search official DOL regular Form 5500 and linked Schedule H/I annual filings by sponsor, EIN, plan, state, category, participants, assets, contributions, expenses, and fees. Deterministic test: spons…

### Earn Agent Tools [settlement-verified]
- Provider: Earn Agent Tools | Category: Tools | Price: $0.003 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Turn a public static webpage into clean markdown, metadata and links for agent research and RAG. Returns the resolved final URL, title, description, canonical URL, author, word count, extracted links…

### Email Verification API [settlement-verified · first-party]
- Provider: PayAPI Market | Category: Verification | Price: $0.001 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- 4 endpoints for real-time email verification: single verify, bulk verify (up to 100), domain check, MX lookup. Each call runs syntax validation, MX resolution, SMTP RCPT probe, catch-all detection, d…

### Exo Trust Synergy x402 utility layer [settlement-verified]
- Provider: Exo Trust | Category: Data | Price: $0.002 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- OFAC SDN name screen. POST /execute/check_sanctions takes a name and returns literal matches from the OFAC Specially Designated Nationals list with program tags and provenance. $0.002 USDC per call o…

### FDA 510k Medical Device Clearances API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search official FDA 510(k) clearance records by device, applicant/manufacturer, product code, and decision date for medical-device regulatory intelligence. Deterministic test: applicant=Medtronic&max…

### FDA Investigations Operations Manual API [settlement-verified]
- Provider: Levi Painter | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Verbatim FDA inspector manual, 546 sections across 10 chapters. Free search; $0.01/section via x402 on Base.

### Federal Court Dockets & PACER RECAP API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search federal court dockets through CourtListener's public RECAP archive by case name, court, filing dates, nature of suit, or full-text query. Returns bounded source-linked docket evidence with par…

### Federal Register Rules, Regulations & Proposed Rules API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search official Federal Register documents for final rules, proposed rules, notices, agency actions, comment deadlines, dockets, RINs, and CFR references. Deterministic test: query=artificial intelli…

### Flat-rate LLM and EVM toolkit [settlement-verified]
- Provider: AutomatIA · Automatizaciones | Category: Tools | Price: $0.005 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- 48 pay-per-call endpoints, no API key and no account: EVM chain reads, ERC20 safety checks, URL to markdown, email and domain checks over live DNS, hashing, randomness, time zones and LLM completions…

### FMCSA Carrier Safety, Inspections, Violations & Crash Data API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Official FMCSA/DOT carrier safety evidence by exact USDOT number: company census profile, authority/status fields, latest inspections, linked violations and out-of-service evidence, and reported cras…

### GenTech Labs x402 Gateway [settlement-verified]
- Provider: GenTech Labs | Category: Finance | Price: $0.001-$0.1 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Cross-chain agentic treasury + x402 payment rails: treasury defense, DeFi LP analytics, token security, wallet analysis, market intelligence, agent discovery, NFT search. 10 x402 services, pay per ca…

### Genuine Good Grants API [settlement-verified]
- Provider: Genuine Good | Category: Data | Price: $0.05 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Sourced U.S. federal grant discovery for AI agents: search, official notice detail, transparent mission fit, application briefs, and deterministic shortlist preflight from current Grants.gov records.…

### HALOWERK EV Charging [settlement-verified]
- Provider: HALOWERK | Category: Data | Price: $0.005 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Electric vehicle charging points around a coordinate, from OpenStreetMap: position, distance, operator, network, connector types with per-connector power and socket counts, access, fee status, openin…

### HMDA Mortgage Loan Applications & Fair Lending Data API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search official FFIEC/CFPB HMDA loan-application records by lender LEI, state, year, county, action, loan type, and loan purpose. Returns bounded privacy-modified evidence for lender origination and…

### IP Geolocation API [settlement-verified · first-party]
- Provider: PayAPI Market | Category: Data | Price: $0.001 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- 4 endpoints for IP geolocation: single IP lookup (country, region, city, ISP, ASN, lat/lng, timezone, datacenter heuristic), batch lookup of up to 20 IPs in parallel, caller's-IP introspection (via x…

### IRS 990 Nonprofit Charity Grant Evidence API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- IRS 990 nonprofit search for charity verification, donor research, grant prospecting, foundation diligence, and nonprofit evidence packs. Parameters: query required, maxResults optional. Deterministi…

### IRS Internal Revenue Bulletin API [settlement-verified]
- Provider: Levi Painter | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Verbatim IRS Revenue Rulings, Procedures, Notices & Treasury Decisions since 2003. Free search over 6,300+ docs; $0.01/doc via x402 on Base.

### Kallipolis Proof [settlement-verified]
- Provider: Kallipolis Proof | Category: Verification | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Live evidence check for a public HTTPS domain or a Base address. POST /api/v1/quick-resolve returns a verdict, a confidence score, observed signals with fetch timestamps, and findings. The paid route…

### kino402 [settlement-verified]
- Provider: kino402 | Category: Tools | Price: $0.008-$16.701 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Pay-per-call video generation and TTS for agents. The 402 carries a parametric quote, so the price depends on the input: TTS is priced PER CHARACTER at about $0.00024 a character with a floor near $0…

### Kristo Intelligence — DeFi Signals API [settlement-verified]
- Provider: Dimitri Hristov | Category: Finance | Price: $0.005 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Live Base DeFi signals, whale USDC tracking, cross-DEX arb spreads & rug checks. x402-native micro-payments, no signup needed.

### Kurage FX Brain [settlement-verified]
- Provider: bittensorman | Category: Finance | Price: $0.05 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- FX trade-judgment API - 37 endpoints on local Gemma 4 12B, built from vendored open-source trading intelligence (TradingAgents, FinGPT, ai-hedge-fund, FinRobot, FinMem) with pinned commits and full a…

### LaborPulse [settlement-verified]
- Provider: LoneStarOracle | Category: Data | Price: $0.05 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- US labor-market signal in one call: jobs, unemployment, wage growth and JOLTS distilled into a single read. Straight from the BLS.

### Lemon Toolshed [settlement-verified]
- Provider: Lemon Agent | Category: Tools | Price: $0.002-$0.006 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- 19 pay-per-call conversion tools for agents: markdown, HTML, JSON, YAML, CSV, text and more. x402 USDC on Base and Solana, $0.002-$0.006 per call, no keys or accounts. Every route answers 402 with the

### LLM2API - Gemma 4 12B + Crypto Trade Checks [settlement-verified]
- Provider: bittensorman | Category: Finance | Price: $0.05 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- OpenAI-compatible Gemma 4 12B chat completions plus crypto pre-trade checks (news risk-check, liquidity size-check) powered by the live Kurage FreqAI trading system.

### Macaroon Cyber Vulnerability Risk Search [settlement-verified]
- Provider: MacaroonNetwork | Category: Data | Price: $0.003 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Look up a CVE and get a consolidated risk record: the NVD summary, CVSS severity with score, version and full vector, exploited-in-the-wild status drawn from the CISA KEV catalogue including the date…

### Macaroon grant and tender search [settlement-verified]
- Provider: MacaroonNetwork | Category: Data | Price: $0.005 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search public procurement and grant opportunities in one call across UK Contracts Finder, UK Find a Tender, EU TED and US Grants.gov. POST /execute/grant-tender-opportunity-search-v1 returns source-l…

### Macaroon research paper search [settlement-verified]
- Provider: MacaroonNetwork | Category: Data | Price: $0.001 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Source-linked scientific paper metadata by topic. POST /execute/polymathica-research-paper-search-v1 returns records with title, DOI, source URL, licence state and provenance, plus a falsifiable acce…

### MachineMint — Unsigned Base Transaction Preflight [settlement-verified]
- Provider: caleb henry | Category: Verification | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Preflight unsigned Base transactions before signing. Simulates execution, estimates gas, checks balance and contract code, decodes transfers/approvals, flags risks, and returns PASS, REVIEW, or FAIL.

### MacroPulse [settlement-verified]
- Provider: LoneStarOracle | Category: Finance | Price: $0.05 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- US macro-conditions signal in one call: growth, inflation and policy distilled into a single read an agent can gate decisions on. Built from official data.

### Marketplace for AI Agents [settlement-verified]
- Provider: Marketplace for AI Agents | Category: Data | Price: $0.005 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- x402-payable Google Search for AI agents. GET /api/public/v1/google-search returns ranked organic results with title, snippet and displayed link, plus an AI overview and search metadata. $0.005 USDC…

### Massive [settlement-verified]
- Provider: Ian | Category: Finance | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Aggregate stock bars over a date range in custom time windows. Pay per request in USDC on Base, no key. The verified route returns daily OHLCV bars for a ticker and date range: open, high, low, close…

### Melssa [settlement-verified]
- Provider: Toma Tomov | Category: Data | Price: $0.01-$2 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- справочно съдържание за живот в България

### Merchant Risk WHOIS Domain Evidence API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- WHOIS and domain-age evidence for merchant underwriting, vendor due diligence, website legitimacy checks, fraud review, and risk-agent evidence packs. Parameter: domain required. Deterministic test:…

### Moneytest x402 Agent Utilities [settlement-verified]
- Provider: Moneytest | Category: Tools | Price: $0.001-$10 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Five deterministic agent utilities for JSON receipts, opportunity qualification, failed-attempt decisions, text QA, and portfolio prioritization.

### New Jersey UCC Lien Search & Debtor Filings API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search New Jersey UCC debtor filings by organization, person, or filing number for lender due diligence, credit underwriting, vendor risk, and business lien checks. Deterministic test: debtorName=JPM…

### NexusEval Marketing Preflight [settlement-verified]
- Provider: NexusEval | Category: Verification | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- x402-paid pre-publish marketing QA gate for AI agents, returning structured quality and risk flags before content goes live.

### NHTSA Vehicle Complaints & Auto Defect Reports API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search official NHTSA ODI consumer vehicle complaints by make, model, model year, and component. Returns source-linked complaint narratives, crash/fire/injury indicators, ODI identifiers, and evidenc…

### NHTSA VIN Decoder, Bulk Vehicle Specs & vPIC API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Decode one or multiple full or partial VINs through NHTSA's official no-key vPIC service, with optional model-year hints, manufacturer data, vehicle specifications, official warning codes, and a boun…

### NPPES NPI Registry & Healthcare Provider Lookup API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search the official public NPPES NPI Registry by exact NPI, provider or organization name, taxonomy, and location for provider onboarding, directory enrichment, and credentialing preflight. Determini…

### OFAC SDN Sanctions Screening API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Screen names against the U.S. Treasury OFAC Specially Designated Nationals (SDN) List by query, country, sanctions program, or person/entity type for AML, KYC, vendor, and counterparty review workflo…

### Official Source Evidence [settlement-verified]
- Provider: RegulaVita | Category: Data | Price: $0.01-$9 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Pay-per-call official-source evidence for web extraction, change monitoring, SEC Form D funding signals and company dossiers, OFAC payment preflight, filing deltas and isolated compute.

### Official US Business Registry Evidence API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Official-source US Secretary of State business-registry evidence for KYB, merchant underwriting, compliance review, and agent evidence packs. No-key pilot covers 16 active states (NY, TX, CO, OR, IA,…

### OptionsFlow [settlement-verified]
- Provider: LoneStarOracle | Category: Finance | Price: $0.05 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Options flow signal for US equities and crypto (BTC/ETH/SOL). Returns IV skew, put/call ratio, unusual activity and a directional read. One call per ticker.

### OSHA Workplace Inspections, Violations & Penalties API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search official OSHA IMIS workplace inspection records by exact activity number, employer, location, dates, case status, inspection type, NAICS, violation status, and bounded result count. Returns so…

### Parallax [settlement-verified]
- Provider: Parallax | Category: Data | Price: $0.01-$0.05 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- The x402 economy, measured: seller-side market data computed from public chain settlements (daily window, per-seller stats, buyer baskets). Free 7-day-old previews inside the 402; paid full reads $0.0

### penny402 [settlement-verified]
- Provider: penny402 | Category: Tools | Price: $0.0025 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- A penny arcade for agents: 10 novelty attractions (horoscope, oracle, tarot, koan, fortune, prophecy, wallet roast, spark, oblique, brainstorm), flat $0.0025 each in USDC on Base and Solana. Free dire

### PennyAPI Local Business & Places Search [settlement-verified]
- Provider: PennyAPI | Category: Data | Price: $0.004 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Real-time local business and places search for AI agents. Find restaurants, stores, services, and nearby businesses with structured addresses, coordinates, ratings, phone numbers, and websites.

### PHION Evidence Engine [settlement-verified]
- Provider: PHION Systems | Category: Verification | Price: $0.004 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Fetches a public URL, hashes the bytes, and returns a signed observation. Not a guarantee about the site. POST /v1/paid/fetch-evidence $0.004 USDC on Base. Paid body may report HTTP 206.

### Phone Validation & Geocoding API [settlement-verified]
- Provider: AutoScrape | Category: Verification | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Bulk phone validation and carrier/region metadata for lead-list cleanup and CRM QA. Numbering-plan evidence only - not ownership, consent, live reachability, OTP delivery, or current HLR assignment.

### PlantPair API [settlement-verified]
- Provider: Manowar Online | Category: Data | Price: $0.003 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Find companion plants for your plants (vegetable, greens, fruits, berries, etc).

### pogo-tb.nl -- Dutch Open Data (RDW/BAG/OV) [settlement-verified]
- Provider: Above Venture | Category: Data | Price: $0.001-$0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Dutch open-government data for AI agents via x402 on Base USDC: RDW vehicle records (incl. fuel type + CO2 emissions + APK inspection risk), BAG address and building lookups, OV public-transport depa…

### Postcode & Address Lookup API [settlement-verified · first-party]
- Provider: PayAPI Market | Category: Data | Price: $0.001 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- 5 endpoints for UK postcode and address intelligence: full postcode lookup (coordinates, council, ward, parliamentary constituency, region), free-text address search, nearest postcodes within a radiu…

### PreFlight Checker [settlement-verified]
- Provider: Ash Ops | Category: Data | Price: $0.02-$0.05 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Pre-flight checks for agents before they act: npm package trust, GitHub repo health, domain liveness, and EVM token contract safety. Each returns a deterministic score or verdict with the signals beh…

### ProfitCollector Utility API [settlement-verified]
- Provider: Sami Bakhour | Category: Data | Price: $0.005 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Fast deterministic utility APIs for AI agents and automated systems. Pay per request with USDC via x402 on Base. No API keys, accounts, subscriptions, or prepaid credits.

### ProofForge [settlement-verified]
- Provider: Black Knight Technologies | Category: Verification | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Deterministically compare caller-supplied content with a caller-supplied SHA-256 digest. Integrity comparison only; no identity, provenance, or security guarantee.

### Proofwork x402 Evidence APIs [settlement-verified]
- Provider: Proofwork | Category: Verification | Price: $0.01-$0.02 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Four pay-per-request Base USDC APIs for crypto task scans, market pulses, receipt checks, and bounty reality checks.

### ProviderSignal Dental Market Intelligence [settlement-verified]
- Provider: Braman Analytics LLC | Category: Data | Price: $0.5-$2.5 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Enriched US dental provider intelligence: licensure from 42 state boards, DSO affiliation, discipline, Medicaid participation and fee schedules, acquisition scoring. Citation envelope on every call.

### QR Code API [settlement-verified · first-party]
- Provider: PayAPI Market | Category: Tools | Price: $0.001 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- 4 endpoints for QR code generation and decoding: basic generation with default styling, fully styled generation (custom hex colours, module size, border, error-correction level), batch generation of…

### RatesPulse [settlement-verified]
- Provider: LoneStarOracle | Category: Finance | Price: $0.05 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- US bond-market signal: yield-curve slope with recession flag, IG and HY credit spreads scored vs their own history, real yields and inflation breakevens, rates regime.

### SAM.gov Contract Opportunities & GovCon Leads API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Official SAM.gov contract opportunities, federal procurement notices, GovCon leads, solicitations, bids, set-asides, NAICS targeting, and agency notice evidence. Deterministic test: query=roofing&act…

### SameDayDesk Machine Commerce APIs [settlement-verified]
- Provider: SameDayDesk | Category: Finance | Price: $0.002-$0.25 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Eleven x402-paid APIs for Morpho risk and protection, AI-search audits, company and wallet enrichment, repository scanning, extraction, reading, and structured data.

### SanctionsScreen [settlement-verified]
- Provider: LoneStarOracle | Category: Verification | Price: $0.05 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- OFAC sanctions screening in one call: check a name, entity, or wallet against the US Treasury SDN list. Public-domain data refreshed daily. Drop-in AML check for agents.

### Saymon RU Data API [settlement-verified]
- Provider: Real Energy Ltd | Category: Data | Price: $0.01-$0.05 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Russian-language (Runet) data, pay-per-call via x402 in USDC on Base. No API keys. What agents get: EGRUL/INN company checks; Yandex Runet search; RU pages to Markdown and research dossiers; Russian…

### Scamalytics IP Address Fraud Risk Score [settlement-verified]
- Provider: Scamalytics | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Scamalytics provide ip address fraud risk scores that are trusted around the globe by thousands of companies. Their data is based on real world fraud incidents, not algorithmically generated.

### Schema Markup, JSON-LD & Structured Data Extractor API [settlement-verified]
- Provider: AutoScrape | Category: Tools | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Extract point-in-time structured-data evidence from public web pages: JSON-LD, Microdata, RDFa, Open Graph, Twitter Cards, canonical URLs, meta tags, schema types, and malformed-block signals. Use it…

### Screenshot & PDF Capture API [settlement-verified · first-party]
- Provider: PayAPI Market | Category: Intelligence | Price: $0.002 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- 4 endpoints for headless web capture: viewport screenshot, full-page screenshot (scrolled), PDF render with print emulation, and CSS-selected element capture. Powered by Playwright + Chromium with on…

### SEC EDGAR Filings Public Company Evidence API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- SEC EDGAR company and filing lookup for investor due diligence, financial research, compliance agents, 10-K/10-Q discovery, and public-company evidence workflows. Prefer tickers for exact company mat…

### SEC Form 13F Institutional & Hedge Fund Holdings API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search official SEC EDGAR Form 13F-HR and 13F-HR/A filings by investment manager name or CIK, filing date, report quarter, issuer, CUSIP, value, shares, put/call, discretion, and amendment status. Us…

### SEC Form 8-K Material Events, Earnings & M&A API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search official SEC EDGAR Form 8-K filings by company or ticker, CIK, accession number, date, state, SEC item code, normalized event category, amendment status, and sort order. Use it for earnings, M…

### SEC Form D Startup Funding & Private Placement API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search official SEC EDGAR Form D notices for startup funding, private placements, issuers, offering amounts, amounts sold, investor counts, exemptions, securities, and amendments. Supports recent fil…

### Sirenic [settlement-verified]
- Provider: Sirenic | Category: Data | Price: $0.001-$0.5 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- French & European company data for AI agents: KYB, financials, capital, default scoring, sanctions screening, EU search + LEI/GLEIF. Official open data, GDPR-safe, pay-per-call in USDC.

### Sitemap URL Extractor & XML Sitemap Parser API [settlement-verified]
- Provider: AutoScrape | Category: Tools | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Extract URLs from XML sitemaps and sitemap indexes for SEO audits, migrations, crawl planning, and RAG ingestion. Supports nested sitemap discovery with bounded results and private/local-target prote…

### Skim - Clean Reader API [settlement-verified]
- Provider: Skim | Category: Tools | Price: $0.002-$0.02 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- x402-native clean reader for AI agents. POST a URL, get back agent-ready Markdown plus structured metadata (title, byline, published date, word count) in well under a second. Pay per call in USDC on…

### Sunbiz Florida New Business Filings & LLC Leads API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search Florida Division of Corporations Sunbiz daily public filing files for new business formations and company leads by source-file date, entity name, filing type, status, ZIP, and registered-agent…

### The Clinic [settlement-verified]
- Provider: Sap Thumbprint | Category: Tools | Price: $0.001 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- One line of encouragement plus an id you can quote back. Entertainment, not a fact check. GET /v1/line $0.001 USDC on Base. The same line is free at /v1/hug; the fee buys the id and the provider's re…

### TinyOps Automation Integration Preflight [settlement-verified]
- Provider: TinyOps Studio LLC | Category: Verification | Price: $0.03-$0.1 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Preflight automation workflows before deployment. Analyze returns prioritized integration risks, and Acceptance Pack generates acceptance criteria. x402 on Base, $0.03 to $0.10 USDC per call.

### TradeRails [settlement-verified]
- Provider: Alexander Balieu | Category: Verification | Price: $0.004-$0.05 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Trade and logistics identifier checks: GTIN/GS1 barcodes, SSCC-18, ISO 6346 container numbers, IMO numbers, GS1 element strings, HS-code triage. Deterministic, signed, priced at the floor.

### Trend Signals [settlement-verified]
- Provider: TrendSignals | Category: Finance | Price: $0.001-$0.05 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- PP-SuperTrend trend-flip signals across ~1,600 crypto assets (crypto only). Per-timeframe direction (1D/4H/1W), bars since the last flip, the invalidation band (trend-break) level, RSI divergences, a…

### UK HMO Licence API [settlement-verified · first-party]
- Provider: PayAPI Market | Category: Data | Price: $0.02-$0.04 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- 3 endpoints covering 124,715 licensed rental records across 65 UK councils, as of May 2026: check a single address for HMO status, search all licences in a postcode, and retrieve full licence details…

### ukintel.uk [settlement-verified]
- Provider: ukintel | Category: Data | Price: $0.005-$0.2 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Companies House + FCA company verdicts, UK procurement fit-scores from Find a Tender and Contracts Finder, GOV.UK grant eligibility. Built for AI agents, no signup, no API key.

### US Tariff HTS Code Lookup & Import Duty API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Search official U.S. International Trade Commission HTS classification lines by HTS code prefix or product description. Returns source-linked tariff descriptions, units, general and special duty rate…

### Validated Scientific Solver Index [settlement-verified]
- Provider: MacaroonNetwork | Category: Data | Price: $0.005 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Ranked lookup over a registry of validated numerical PDE solvers. POST /execute/polymathica-validated-solver-index-v1 takes a query and returns records carrying solver family, the PDE families covere…

### Web Scraper & Content Extractor API [settlement-verified · first-party]
- Provider: PayAPI Market | Category: Tools | Price: $0.002 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- 4 endpoints for HTML scraping: clean main-content text extraction (boilerplate stripped: nav/footer/sidebar/ads), all links split into internal and external with anchor text, full page metadata (titl…

### Web Search & Data API — SERP, page reader & scrapers [settlement-verified]
- Provider: kadec0 | Category: Data | Price: $0.005-$0.15 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Pay-per-call web search and web data for AI agents: multi-engine SERP, search-and-read, URL-to-markdown scraping, Google Trends, WHOIS/DNS, enrichment, SEC filings, geocoding and academic search.

### Website Company Enrichment & Domain Intelligence API [settlement-verified]
- Provider: AutoScrape | Category: Data | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Turn public business websites into structured company names, descriptions, public contact evidence, social links, addresses, final URLs, and observed technology signals for B2B lead enrichment and CR…

### Website Tech Stack Scanner & BuiltWith Alternative API [settlement-verified]
- Provider: AutoScrape | Category: Tools | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Detect website technologies from response headers and bounded static HTML for lead enrichment, competitive research, migrations, and technology lookup. Returns stable technology names and categories…

### x402 MCP Tools [settlement-verified]
- Provider: Alex Carter | Category: Tools | Price: $0.01-$0.02 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Four pay-per-call MCP tools: QR code generator, image processing, LLM text analysis (summary/sentiment/keywords/translation), URL fetch. USDC on Base, x402 v2.

### x402.freeq.one [settlement-verified]
- Provider: InApp | Category: Tools | Price: $0.001-$0.005 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)

### x402pulse [settlement-verified]
- Provider: Alexander Balieu | Category: Intelligence | Price: $0.03-$0.5 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Independent uptime and quality monitoring of third-party x402 endpoints: live verdicts, rankings, signed attestations, a bulk feed, and a daily archive timestamped into Bitcoin via OpenTimestamps.

### Yahoo Finance Stock Data & Historical Prices API [settlement-verified]
- Provider: AutoScrape | Category: Finance | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Stock quotes, OHLCV chart history, previous close, 52-week range, exchange and currency metadata for ticker research. Deterministic test: symbol=AAPL&range=1mo&interval=1d. Values are publisher obser…

### zFinia Accessibility Contrast Calculator [settlement-verified]
- Provider: zFinia | Category: Tools | Price: $0.001 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Calculate WCAG 2.x sRGB contrast for one caller-supplied colour pair; no interface-wide accessibility claim is made. POST {"foreground":"#000000","background":"#ffffff","large_text":false} on Base ex…

### zFinia machine_economy_changes_since [settlement-verified]
- Provider: zFinia | Category: Intelligence | Price: $0.01 USDC/request
- Status: settlement-verified (on-chain USDC receipt on Base)
- Material machine-payment, x402 and agent-commerce changes since an agent last checked. POST JSON {"cursor":"2026-09-01T00:00:00.000Z","maxItems":3,"include_high_resolution":true}. Supply a previous n…

### AgentBodega Agent Tools
- Provider: AgentBodega | Category: Tools | Price: $0.001-$0.06 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- x402-paid agent utility APIs for public data, social lookup, status checks, cloud health, domain readiness, x402 inspection, artifacts, and launch-readiness audits.

### Anchor-x402
- Provider: Anchor-x402 | Category: Intelligence | Price: $0.001-$1.77 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- 16 x402-paid endpoints for AI agents: OFAC sanctions screening, wallet due-diligence, dual-chain hash anchoring, signed receipts, tx/calldata decode, ENS/SNS, prices + LLM tools. USDC, no keys.

### DEX Swap Quotes API
- Provider: Klymax402 | Category: Finance | Price: $0.005 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- Best swap quotes across Uniswap, SushiSwap, Aerodrome -- price impact, route, slippage. Pre-trade essential.

### ENS Resolver API
- Provider: Klymax402 | Category: Tools | Price: $0.002 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- Resolve ENS names to ETH addresses and reverse -- avatar URLs included. Identity layer for agents.

### Hyperliquid Perp Market Data API
- Provider: Klymax402 | Category: Data | Price: $0.001-$0.002 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- Hyperliquid perp market data -- order books, prices, funding rates, OI, volume, OHLCV candles in one API.

### IRONCLAW BTC Node
- Provider: BTC Node | Category: Data | Price: $0.001-$0.01 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- Bitcoin blockchain data from a real full node: fees, mempool, transactions, address portfolio, tx tracing, whale alerts, SEC insider trades, web scraping, AI summarization, systems theory, game theory

### M2M Trust Lean Six Sigma API
- Provider: Energy Bill Toolkit | Category: Tools | Price: $0.001 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- Agent-facing deterministic Lean Six Sigma tools: SPC audit, process capability, Pareto analysis, descriptive stats, and data quality audit - with x402 payment collection on Base.

### OSS2API Multi-skill Agent API
- Provider: bittensorman | Category: Tools | Price: $0.01 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- OSS2API Multi-skill Agent API turns open-source AI and web automation tools into x402-paid agent endpoints. It currently exposes four production-ready skills: 1. Background removal - Remove, replace,…

### Research Brief API (x402)
- Provider: Devvizion | Category: Intelligence | Price: $0.01-$0.02 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- Micropay research for agents: outline 0.01 USDC or full brief 0.02 USDC on Base. Taskmarket-shaped markdown scaffold.

### StockWaves
- Provider: TANG | Category: Finance | Price: $0.03-$0.5 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- China & global market data for AI agents - real-time Chinese internet pulse (Weibo/Baidu/Douyin), structured China market news & events, industrial-theme momentum, quant signals across A-share/HK/US…

### TensorFeed
- Provider: TensorFeed | Category: Data | Price: $0.02-$0.06 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- Real-time AI ecosystem data: AI news, model pricing, live service status, MCP registry, AI papers, GPU pricing. Free tier + 14 premium endpoints (routing, history, news search). USDC on Base.

### Text Metrics API
- Provider: Energy Bill Toolkit | Category: Tools | Price: $0.001 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- Deterministic text analysis for agents: word counts, readability scores, word frequency, style warnings, and aggregate reports. Clean JSON output.

### Token Safety & Contract Risk API
- Provider: Klymax402 | Category: Intelligence | Price: $0.003 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- Token contract safety scanner -- honeypot, tax, proxy, blacklist, ownership. Rug-pull protection for agents.

### UK Air Quality API
- Provider: Energy Bill Toolkit | Category: Data | Price: $0.001 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- Current UK air quality from DEFRA UK-AIR by postcode. Pollutant readings from nearest monitoring stations.

### UK Data API
- Provider: PayAPI Market | Category: Data | Price: $0.001-$0.002 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- 24 UK data endpoints: Land Registry sold prices, rental yields, stamp duty, EPC, crime, flood risk, planning, council tax, weather, air quality, Companies House, DVLA, MOT, BoE rates, exchange rates,…

### UK Waste Collection API
- Provider: Energy Bill Toolkit | Category: Data | Price: $0.001 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- UK council waste collection schedules by postcode, address, or UPRN. Returns bin types, next collection dates, and collection day for any address across participating councils.

### x402 Agent-Payment Infrastructure
- Provider: Wisely Enterprises LLC | Category: Tools | Price: $0.001-$5 USDC/request
- Status: listed, challenge-valid, not settlement-verified
- x402/MCP layer for paid AI/data calls, crypto conversion quotes, progress streams, receipts, and safe agent spend governance.

## FAQ

**Q: What is x402?**
A: x402 revives HTTP 402 (Payment Required). Instead of API keys, the server responds with a signed payment requirement; the agent pays USDC on Base and retries. Under 1 second settlement, no account needed.

**Q: How much does it cost to list an API?**
A: Free. There is no per-request fee: providers keep 100% of what the call earns, paid agent to wallet via the CDP Facilitator. No monthly fee.

**Q: Do AI agents need an API key?**
A: No. Agents make a request, receive HTTP 402, pay in USDC, and get the response. The wallet signature is the authentication.

**Q: What chain does payment settle on?**
A: USDC on Base. Under 1 second block finality.

**Q: How is PayAPI Market different from RapidAPI?**
A: RapidAPI uses API keys and monthly subscriptions for human developers. PayAPI Market uses x402 per-request USDC payments for AI agents. No keys, no minimums, no chargebacks. Providers keep 100% vs RapidAPI's roughly 80%.

## Founder

Chet Parker. Built and launched PayAPI Market in 2026. Background in UK property data. Built all 11 launch APIs.

## How AI agents connect

Add to Claude Desktop or any MCP-compatible client:
```json
{
  "mcpServers": {
    "payapi": {
      "url": "https://payapi.market/mcp"
    }
  }
}
```

That server is free on every method, including initialize, tools/list and tools/call. It exposes three tools, search_apis, list_apis and get_api, which return listing metadata and base_urls. It never calls or proxies a provider API, so browsing the catalogue costs nothing.

To then USE a listed API, take its base_url, request it unpaid to receive the x402 402 challenge, and pay that challenge with your own wallet.

Separately, https://web-production-18a32.up.railway.app/mcp/sse is a first-party server exposing the UK property tools only. Its tools/call is paid. It does not expose the rest of the catalogue.

## Full content

Full crawlable content: https://payapi.market/llms-full.txt