PayAPI Market is a warehouse where AI agents pick an API and pay per call in USDC on Base.

Think of a vending machine. You do not buy the machine. You put in the coin and take one can. Settlement is instant. No account. No key. We do not stand in the slot.

The badge means we put a coin in from our own wallet and the can came out.

130 settlement-verified · providers keep 100% · pay per request in USDC. Powered by the x402 payment standard: agents pay per call, providers get paid automatically.

Browse verified APIs · List your API (free)

147 Live APIs · 130 settlement-verified · 983 Endpoints · 100% Kept by providers

x402 verified

We paid for it from our own buyer wallet and received product back. The badge is enforced at database level: it cannot be set without a matching settlement record. 130 listings carry it, of which 9 are our own first-party APIs.

Listed

The provider submitted it and it responds to a challenge. We have not paid for it yet.

The story

I'm Chet. I have invested in startups for 27 years. I watched blockchain from 2013. In 2017 I went all in. Then agents arrived, and everyone built maps of vending machines that were unplugged.

An agent does not want to buy the warehouse. It wants one can. Grants search. A company check. A charger map. Pay, get the item, move on.

Directories still sell the whole machine: sign up, get a key, wait. PayAPI is the plugged-in slot. Someone lists a button. We drop a real USDC coin on Base. If the can comes out, the row goes on the floor. If the machine is a tunnel, the coil is empty, or the coin bounces, it stays in the back.

Providers keep 100% of the coin. We are not the machine. We are the warehouse that already tested the slot.

List one durable path at https://payapi.market/list.
Agents start at https://payapi.market/mcp.

Marketplace for x402-powered APIs that AI agents pay per call with USDC on Base. No accounts, no API keys. Discoverable over MCP.

Why PayAPI vs enterprise data providers

Enterprise data providers charge $15,000 per year with annual contracts. PayAPI Market charges $0.002 per request with no commitment. That is 7,500,000 requests before you break even on the enterprise plan. AI agents cannot fill out forms, enter credit cards, or sign contracts. They need x402.

USDC on Base: sub-second settlement, less than $0.001 transaction fee. Zero support tickets needed.

How it works

1. Agent finds an API on payapi.market.
2. Pays the listed price in USDC, no key, no signup.
3. Gets the data, and the provider is paid automatically.

Who is this for

You do not need to be a developer. You need domain expertise. Mortgage brokers, recruiters, accountants, estate agents, solicitors, logistics managers, compliance officers, insurance underwriters, pharmacists, and quantity surveyors can all monetise their specialist knowledge through APIs on PayAPI Market.

Live API listings

147 live APIs, 983 endpoints total across property, companies, weather, vehicles, finance, HMO licensing, waste collection, air quality, text analytics, data intelligence, and more.

Browse all APIs — view the full marketplace →

Pricing

Listing is free. No per-request fee, providers keep 100% of what the call earns. No subscriptions for buyers. Agents pay per request.

• List your API - free
• Explore the marketplace
• Estimate your revenue
• See pricing

List your API. Keep 100%.

Free to list. No per-request fee from us. We verify with a real payment before the badge goes on. Your API is discoverable by every Claude Desktop, Cursor and custom agent connected to the marketplace.

Submit your API

Full catalogue

A selection of the 147 live APIs on PayAPI Market. See all in the marketplace →

• UK Data API: 24 endpoints. UK government and public data: Land Registry, EPC, Companies House, DVLA, BoE rates, weather, crime, flood risk. $0.001–0.002 per request.
• Email Verification API: 4 endpoints. SMTP check, disposable-domain filter, catch-all detection, role-account heuristics. $0.001 per request.
• Postcode & Address Lookup: 5 endpoints. UK postcode to address, validation, autocomplete, geocoding. $0.001 per request.
• Currency & Crypto API: 5 endpoints. FX rates, crypto spot prices, historical series, conversion. $0.001 per request.
• Screenshot & PDF Capture: 4 endpoints. Headless browser page rendering, full-page screenshots, PDF export. $0.002 per request.
• DNS & Domain Intelligence: 5 endpoints. WHOIS, DNS A/AAAA/MX/TXT, SPF/DKIM, nameserver history. $0.002 per request.
• Web Scraper & Content Extractor: 4 endpoints. HTML to structured data, readability extraction, metadata. $0.002 per request.
• IP Geolocation API: 4 endpoints. IP to country, city, ASN, ISP, timezone. $0.001 per request.
• QR Code API: 4 endpoints. QR generation, decoding, styling, batch. $0.001 per request.
• UK HMO Licence API: 3 endpoints. HMO licence check by address or postcode, full licence details. 124,715 licensed rental records across 65 UK councils, as of May 2026. $0.020–0.040 per request.
• TensorFeed: 60 endpoints. Real-time AI ecosystem data: AI news, model pricing, live service status, MCP registry, AI papers, GPU pricing. $0.020–0.060 per request.
• Official US Business Registry Evidence API: 1 endpoints. Official-source US Secretary of State business-registry evidence for KYB, merchant underwriting, and compliance review across 17 active states. $0.010 per request.
• x402 Agent-Payment Infrastructure: 12 endpoints. x402/MCP layer for paid AI/data calls, crypto conversion quotes, progress streams, receipts, and agent spend governance. $0.001–5.000 per request.
• Merchant Risk WHOIS Domain Evidence API: 1 endpoints. WHOIS and domain-age evidence for merchant underwriting, vendor due diligence, and website legitimacy checks. $0.010 per request.
• IRS 990 Nonprofit Charity Grant Evidence API: 1 endpoints. IRS 990 nonprofit search for charity verification, donor research, grant prospecting, and foundation diligence. $0.010 per request.
• Building Permits Roof Age Solar AHJ Evidence API: 1 endpoints. 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 checks. Parameters: city, query/keyword, maxResults. Safe default if city/query are omitted: Austin roof permits with an explicit warning. Deterministic test: city=austin&query=roof&maxResults=5 returns recent permit-event records; city=austin&query=solar&maxResults=5 demonstrates solar/AHJ project evidence.. $0.010 per request.
• SEC EDGAR Filings Public Company Evidence API: 1 endpoints. SEC EDGAR company and filing lookup for investor due diligence, financial research, and 10-K/10-Q discovery. $0.010 per request.
• M2M Trust Lean Six Sigma API: 6 endpoints. Deterministic Lean Six Sigma tools: SPC audit, process capability, Pareto analysis, descriptive stats, and data quality audit. $0.001 per request.
• UK Air Quality API: 1 endpoints. Current UK air quality from DEFRA UK-AIR by postcode, with pollutant readings from nearest monitoring stations. $0.001 per request.
• Text Metrics API: 5 endpoints. Deterministic text analysis for agents: word counts, readability scores, word frequency, style warnings, and aggregate reports. $0.001 per request.
• UK Waste Collection API: 5 endpoints. UK council waste collection schedules by postcode, address, or UPRN across participating councils. $0.001 per request.
• IRONCLAW BTC Node: 24 endpoints. Bitcoin blockchain data from a real full node: fees, mempool, transactions, address portfolio, tx tracing, whale alerts, SEC insider trades, web scraping, AI summarization.. $0.001–0.010 per request.
• Anchor-x402: 16 endpoints. Multi-chain x402 services: OFAC sanctions screening, dual-chain hash anchoring, signed RNG, due-diligence investigator, and LLM utilities. Settles on Base USDC, Solana USDC, or Polygon JPYC. $0.001–$1.77 per request.. $0.001–1.770 per request.
• StockWaves: 14 endpoints. 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 equities, BTC directional signal, crypto microstructure, and tactical ETF allocation. Plus stateless portfolio optimizer. x402 USDC on Base or Solana, no API key.. $0.030–0.500 per request.
• OSS2API Multi-skill Agent API: 4 endpoints. Open-source AI and web-automation tools as x402-paid agent endpoints: image background removal, URL content analysis, Playwright browser extraction & screenshots, and multi-phase web security scan.. $0.010 per request.
• AgentBodega Agent Tools: 52 endpoints. x402-paid agent utility APIs for public data, social lookup, status checks, cloud health, domain readiness, x402 inspection, artifacts, and launch-readiness audits. $0.001–0.060 per request.