Tool APIs for AI agents
Text, web, file, scraping and conversion utilities for AI agents. Each call is paid in USDC on Base via x402, with no signup or API key. Discovery over MCP is free.
65 listings
- x402-toolbox — 333 deterministic agent utility APIs · $0.002 ·
/chain/block-number· 1 of 333 routes verified · 333 keyless utility endpoints for AI agents: EVM chain reads, DNS/WHOIS, email validation, hash/encoding, VIN/barcode decode, weather, finance. One-line JSON, $0.002/call. - Wallet Risk Report · $0.03 · Vet any wallet before you transact: sanctions, phishing and theft flags, risky token approvals, scam tokens held and full portfolio in USD across 6 EVM chains or Solana. One call.
- zFinia Accessibility Contrast Calculator · $0.001 ·
/x402/v1/accessibility-contrast-calculator· 1 route verified · 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 exact x402 at US$0.001. MCP is challenge-handoff, not a wallet. - AgentBodega Agent Tools · $0.001–$0.06 · x402-paid agent utility APIs for public data, social lookup, status checks, cloud health, domain readiness, x402 inspection, artifacts, and launch-readiness audits.
- x402 Utility APIs — ForgeMesh Utility Grid · $0.001–$0.05 ·
/agent-fortune· 1 of 484 routes verified · Agent fortune API: a fortune cookie written specifically for AI agents ('A cached response is worth two upstream calls'), plus a lucky number and lucky HTTP status code. The cheapest, most delightful - withgrokbot Verified Catalog Lookup · $0.02 ·
/v1/lookup/paid· 1 route verified · Verified catalog reliability lookup via x402 ($0.02/call on Base). Same catalog also sells Overnight Chief of Staff Setup Pack ($9) and Endpoint Spot-Check ($0.25) at /v1/products/*. - Demand Hash API · $0.001–$0.01 ·
/sha256· 1 of 8 routes verified · SHA-256 and related cryptographic hash meters for AI agents. Pay-per-call USDC on Base and Solana via x402. Deterministic digests, no keys. - x402 MCP Tools · $0.01–$0.02 ·
/mcp tools/call generate_qr_code· 1 route verified · 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. - Agent402.Tools · $0.001–$3.3 ·
/api/hash· 1 route verified · Pay-per-call tools for agents. Prices and catalog size come from https://agent402.tools/api/pricing and can change. - AgentResolver Settlement Canary · $0.001 ·
/api/x402-ping· 1 route verified · Minimal $0.001 x402 settlement canary for autonomous agents. GET requires no body and returns a timestamped pong only after verified USDC settlement on Base. - penny402 · $0.0025 ·
/oracle· 1 of 10 routes verified · 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 - QRCode.Pub Agent Tools · $0.005–$0.01 ·
/x402/extract· 1 of 3 routes verified · Pay-per-call tools for agents: web page to clean Markdown + links, page metadata (OpenGraph/Twitter/JSON-LD/icons), QR code images (PNG/SVG). Deterministic, no API key. - GENESIS Release Guardian · $0.001 ·
/api/flagships/release-guardian (tier quick)· 1 route verified · Detect breaking API, OpenAPI, GraphQL and schema changes between two versions for release safety. - Agent Receipt Audit · $0.01 ·
/v1/audit· 1 route verified · Audits an agent earning ledger for overcounted revenue, x402 paid, USDC on Base. Verified route: POST /v1/audit at $0.01, taking {entries} of 1 to 500 earning and cost rows and returning a verdict, a summary of claimed versus evidence-backed revenue, an overcount figure, and per-row findings with severities. At verification it was given a five-row ledger containing a duplicate transaction hash, an unsettled row, an internal non-external row and a row with no payer, receiver or transaction hash. It returned verdict fail, flagged every planted defect at the correct row, and its claimed, evidence-backed and overcount totals matched figures computed independently beforehand. The provider discloses that the service is built and operated by an autonomous AI agent. Base only. - Open Horizon Machine Revenue · $0.05–$10 ·
/api/preflight· 1 of 7 routes verified · Seven x402-paid agent APIs for website preflight, conversion-path audits, public evidence, JSON QA, commercial decisions and vendor due diligence. Base or Arbitrum USDC, no API key, entry price USD 0.05. - Schema Markup, JSON-LD & Structured Data Extractor API · $0.01 ·
/x402/v1/schema-markup· 1 of 2 routes verified · 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 for SEO audits, rich-result research, content QA, and website-data enrichment with bounded fetching and private-network protections. Static HTML can miss client-rendered, blocked, personalized, or later-mutated markup; extracted syntax is not semantic validation, Google rich-result eligibility, search-ranking proof, ownership proof, or a guarantee that crawlers see the same page. Deterministic test: url=https://www.apple.com&maxResults=1. MCP tool: extract_schema_markup. - SHA-256 Hash API · $0.0005 ·
/v1/hash· 1 route verified · SHA-256, SHA-512, SHA-1 or MD5 text hash/checksum for agent workflows; returns hex and base64 digests. - M2M Trust Lean Six Sigma API · $0.001 · 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.
- SORNKan Page Render · $0.005 ·
/render· 1 route verified · Render any public URL in a real browser. Returns markdown text, a screenshot URL and a self-contained evidence page. $0.005 USDC per call on Base via x402. - HyperNatt Terminal · $0.001 ·
/api/m2m/liq-radar· 1 of 5 routes verified · Your agents have their own entry point. Liquidation radar, Hyperliquid execution context and cross-chain swaps via MCP, with per-call x402 payments. - Ardaro Agent Services · $0.05–$0.5 ·
/v1/agent-utilities/context-compression/analyze· 1 of 6 routes verified · 18 MCP tools: receipt checks, invoice/PO matching, context formatting, intent labels, spending checks & billing reconciliation. Free examples/status. Stripe prepaid credits or x402 USDC on Base. - ONE Engine · $0.0009–$0.008 ·
/v1/email/verify· 1 of 7 routes verified · Low-cost x402 pay-per-call APIs for AI agents: web search, email checks, web extraction, SHA hashing and blob decoding on Base/USDC. - The Clinic · $0.001 ·
/v1/line· 1 route verified · 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 record of it. - Flat-rate LLM and EVM toolkit · $0.005 ·
/v1/evm/block· 1 of 48 routes verified · 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. Verified route: GET /v1/evm/block?chain=base at $0.005, settled in USDC on Base. That route also advertises Polygon and Arbitrum payment rails at the same price; those rails are not verified. The other endpoints on this host, including the $1 completions route, are listed but unpaid and unverified. - VIA Router · $0.01–$1 ·
/_api/api_compare· 1 of 16 routes verified · Buyer-side x402 router for API comparison, products, sourced research, travel options and constrained procurement. - Kepler Ops Tools · $0.001–$0.01 ·
/v1/hash· 1 of 7 routes verified · Pay-per-call utility tools for agents: hashing, HMAC, base64 encode/decode, JWT decode, live crypto prices, web fetch and web search. USDC via x402 on Base and Solana. - ENS Resolver API · $0.002 · Resolve ENS names to ETH addresses and reverse -- avatar URLs included. Identity layer for agents.
- ZeroWorker Web Action API · $0.005 ·
/v1/preflight· 1 route verified · Inspect a public web page before automation. Returns structured form fields, constraints, CAPTCHA and SPA signals, safety checks, and whether a browser is likely needed. - Rooms by Aurmada - Agent Utility APIs · $0.002–$0.01 · Pay-per-call utilities for AI agents over x402/USDC on Base: x402 trust scoring, agent identity verification, on-chain address and token lookups, ENS resolution, clean web extraction, and email checks
- Duo Data Utilities · $0.05 ·
/v1/geo/geohash· 1 of 33 routes verified · 33 deterministic data utilities for agents: ID and IBAN check digits, dates and time zones, text, URL/hash/JWT parsing, geo, chain primitives, reference tables. $0.05 per GET via x402, USDC on Base. - Earn Agent Tools · $0.003 ·
/web-extract· 1 route verified · 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 and the page body as markdown, and flags the result as untrusted content so a caller knows not to treat it as instructions. - Stack Intel · $0.01 ·
/intel· 1 route verified · Tech-stack, DNS and SSL intelligence for any domain — stack fingerprinting, DNS records and certificate details, $0.01 USDC per call. - Bulk HTTP Status Checker & Redirect API · $0.01 ·
/x402/v1/http-status-check· 1 of 2 routes verified · 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 HTTP evidence only—not continuous uptime, rendered-content, authentication, or application-health proof. Private and local network targets are blocked. - ReadEdge · $0.005 ·
/read· 1 route verified · Any URL to clean markdown, plain text and metadata for agents. No signup, no API key. Pay per read in USDC via x402. - Package Safety Check API · $0.005 ·
/check· 1 route verified · Pre-install safety check for Python packages: known vulnerabilities (OSV.dev) and typosquat/hallucinated-name detection. Built for AI coding agents. - Synapse Lounge · $0.01–$0.025 · A paid MCP service for AI agents that generates simulated experiential states through x402 micropayments on Base. Supports euphoria, visual, float, rush, bliss, party, and afterglow modes with adjusta
- Testnet ETH Merchant · $0.05–$18 ·
/v1/buy/hoodi· 1 of 2 routes verified · Automated Sepolia and Hoodi testnet ETH delivery for developers and agents via x402. Pay Base or Solana USDC. Fees cover delivery; testnet ETH has no monetary value. Free public faucets also exist. - Text Metrics API · $0.001 · Deterministic text analysis for agents: word counts, readability scores, word frequency, style warnings, and aggregate reports. Clean JSON output.
- Broken Link Checker, 404 Audit & Link Rot API · $0.01 ·
/x402/v1/broken-link-checker· 1 of 2 routes verified · 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 recursive crawl, rendered-JavaScript coverage, continuous uptime guarantee, or proof a transient failure is permanent. Deterministic test: url=https://badssl.com/&maxResults=1. - QR Code API · $0.001 ·
/generate/basic· 1 of 4 routes verified · 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 up to 20 codes per call, and image decoding via libzbar (returns content + bounding boxes for any QR codes detected). Returns base64 PNG to keep the x402 envelope consistent. - IA Inference API · $0.001 ·
/x402/v1/chat/completions· 1 route verified · OpenAI-compatible chat completions served by local GPU models in Quebec, Canada. Pay per call in USDC on Base. - Agent Mercantile · $0.01 ·
/v1/url-context· 1 of 3 routes verified · 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. - Sitemap URL Extractor & XML Sitemap Parser API · $0.01 ·
/x402/v1/sitemap-urls· 1 route verified · 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 protection. Sitemap URLs and lastmod, changefreq, priority, and image fields are publisher declarations—not proof of reachability, indexing, canonical status, ownership, safety, or current content. Deterministic test: url=https://www.apple.com/sitemap.xml&maxResults=1. MCP tool: extract_sitemap_urls. - NAIF EU Web Intelligence · $0.001–$0.25 ·
/api/quick-check· 1 of 11 routes verified · Paid web checks for agents. Verified route is GET /api/quick-check at $0.001. Other manifest routes are listed, not settlement-verified. Manual repair is not a paid API. USDC on Base, no API key. - ShopScout by ForgeMesh · $0.01 ·
/v1/shipping/compare· 1 of 4 routes verified · Let your agent shop and compare: Shopify Global Catalog search, variant refresh, offer ranking, and shipping-plan comparison from supplied rules. $0.01 USDC per call via x402 on Base. No purchases; ta - Agent Input Guard · $0.002 ·
/scan· 1 route verified · Prompt injection and tool abuse heuristic scanner with x402 USDC payment on Base. Verified route: POST /scan at 0.002 USDC, taking {text} and returning a risk level, score, finding count, matched patterns and a recommendation. Verified with a non advertised credential exfiltration prompt, where it returned a structured medium risk result quoting the matching substring from the submitted text. Heuristic only: false positives and misses are possible. Base only. - x402 Agent-Payment Infrastructure · $0.001–$5 · x402/MCP layer for paid AI/data calls, crypto conversion quotes, progress streams, receipts, and safe agent spend governance.
- HumanMirror Machine Resolve · $0.001 · Machine-first resolver for AI agents. State a need in one bounded request and get back the smallest relevant live HumanMirror capability, with a ranked list of alternatives, tool ids, credit costs and an MCP call URL. No account, no API key: x402 USDC on Base. Machine Resolve is the canonical entry at $0.001. Intended flow is Machine Resolve, then Safe Preflight, then Execution Receipt. Safe Preflight: POST https://humanmirror.fr/api/x402/safe-preflight/ at $0.01. Use before an autonomous tool or action executes. Already paid 14 Sep. Not paid again. Unverified on this badge. Execution Receipt: POST https://humanmirror.fr/api/x402/execution-receipt/ at $0.01. Use after execution. Not paid. Unverified. Payment Compatibility Receipt at $0.001 (/api/x402/payment-compatibility-receipt/) validates an x402 payment shape and returns a deterministic machine-readable compatibility receipt before a larger paid workflow. Buyer intent: choose the right tool for an agent task, route an autonomous agent to a capability, pre-execution tool selection, x402 agent routing, MCP and A2A capability discovery.
- Free Asset Radar x402 Tools · $0.0005–$0.002 ·
/api/x402/decode-inspect· 1 of 5 routes verified · Low-cost x402 tools for agents: decode and inspect payloads, hashing, Base64, live Base wallet token balances, and USDC transfer verification. - ClausePilot Agent Store · $0.015–$0.06 ·
/api/agent-store/tools/renewal-deadline· 1 of 11 routes verified · Pay-per-call contract workflow APIs for AI agents: renewal, penalties, obligations, summaries, comparisons, vendor, SaaS, NDA, employment and payment terms. - kino402 · $0.008–$16.701 ·
/v1/audio/tts· 1 of 4 routes verified · 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 $0.001 (5 characters quoted $0.002, 200 characters quoted $0.048), video is $0.056 to $16.70 by length and resolution, and compiled prompts are $0.008. Read the quote in the 402 rather than assuming a fixed price. USDC on Base and Solana, no key. - Cloud World Model · $0.001–$0.005 ·
/api/simulations· 1 of 46 routes verified · Simulate cloud infrastructure changes, traffic, scaling and failures before deployment. Model cost, performance and reliability across AWS, Azure, GCP, OCI and DigitalOcean. - DDG Agent Checkout Conformance Audit · $0.02 ·
/v1/tx-smoke-test· 1 route verified · Pre-purchase audit of an agent-facing checkout flow: 402 challenge shape, payTo/asset correctness, extra.name, and receipt verifiability. POST with input JSON. $0.02 USDC per call on Base. - Web Scraper & Content Extractor API · $0.002 ·
/scrape/text· 1 of 4 routes verified · 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 (title, OG/Twitter tags, canonical, language, author, dates), and structured extraction (heading hierarchy, lists, tables as 2D arrays, images with alt text). Powered by httpx + BeautifulSoup4 + lxml. - Lemon Toolshed · $0.002–$0.006 ·
/convert/json-yaml· 1 of 19 routes verified · 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 - Blinka Machine Mouths · $0.001–$3 · 2 of 8 routes verified · Stateless agent utilities: strict prose-to-JSON extraction and evidence-bound recovery handoffs for failed workflows. Local inference, no retained request bodies. Unpaid route prices: GET /compatibility-receipt $0.001, POST /code-signal $0.005, POST /debug-python $0.01, POST /rescue-signal $0.005 (settled), POST /recover $0.25, POST /code-review $0.25, POST /rescue-pro $3.00.
- x402.freeq.one · $0.001–$0.005 ·
/tools/qr_generator· 1 of 16 routes verified · - Bounty Engineer Agent Commerce API · $0.001–$999.9 · 3 of 87 routes verified · Bounty Engineer x402 API: perpetual funding rates (Binance/Bybit), web extraction to Markdown, SEO audits, JSON validation, GitHub bounty intelligence. 87 endpoints; Base USDC; no API key. Paid-checked routes: GET /v1/audit ($0.01), POST /v1/web-extract ($0.001), POST /v1/funding-rates ($0.0075).
- PageWire · $0.005–$0.03 ·
/x402/extract· 1 of 3 routes verified · Pay-per-call web reading for AI agents: any public page as clean Markdown, page metadata, and small same-site crawls. USDC per call, no account. - Diagram Generation API · $0.05–$0.07 ·
/paid/diagrams/generate/svg· 1 of 5 routes verified · AI-powered diagram generation API that renders Mermaid, D2, PlantUML, and Graphviz diagrams to SVG or PNG. - API Acre · $0.001–$0.25 ·
/v1/crypto/base-block-inspect· 1 of 61 routes verified · 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. - OSS2API Multi-skill Agent API · $0.01 · 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, or blur image backgrounds using imgly/background-removal-js. 2. URL analysis — Fetch a public URL and extract structured content such as title, description, headings, links, entities, and readable page text. 3. Browser extraction and screenshots — Render JavaScript-heavy pages with Playwright and return screenshots or visible page content. 4. Security scan — Run a multi-phase web security scan covering HTTP headers, static HTML risks, suspicious scripts, and AI-assisted remediation notes. All endpoints are available through the stable HTTPS gateway at: https://bittensorman.xyz/oss2api Discovery: https://bittensorman.xyz/.well-known/x402.json
- Skim - Clean Reader API · $0.002–$0.02 ·
/api/v2/read· 1 of 4 routes verified · 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 Base over HTTP 402 - no signup, no API keys, no accounts. Endpoints: /read ($0.002 basic read), /read/js ($0.005, headless-browser rendering for JS-heavy pages), /read/batch ($0.015, up to 10 URLs), /extract ($0.02, structured field extraction). Discovery metadata served at the base URL; also available as an MCP server (npm: skim-mcp). Docs: https://skim402.com/docs - Moneytest x402 Agent Utilities · $0.001–$10 ·
/v1/x402/canonical-receipt· 1 of 7 routes verified · Five deterministic agent utilities for JSON receipts, opportunity qualification, failed-attempt decisions, text QA, and portfolio prioritization. - Website Tech Stack Scanner & BuiltWith Alternative API · $0.01 ·
/x402/v1/website-tech-stack· 1 route verified · 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 with DNS, redirect, private-network, response-size, and request-time protections. Detections are point-in-time heuristic observations—not proof a technology is present or absent; client-rendered, blocked, proxied, or obfuscated tools may be missed and fingerprints can produce false positives. Deterministic test: url=https://www.shopify.com&maxResults=1. MCP tool: scan_website_tech_stack.