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Every pay-per-call x402 API we can find, ranked by what agents actually pay for. No accounts, no API keys.
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2,776 results- Aagent-memory-api-production-f2c4.up.railway.appAI & agents
List all stored memories in a namespace, most recently updated first. Returns a JSON array of memory records.
Baseagent-memory-api-production-f2c4.up.railway.appfrom $0.0012 endpoints - Aaegis-ai.xyzAI & agents
Aegis - Cut Through the Noise in Your Feeds. ブリーフィング トップ3
Baseaegis-ai.xyzfrom $0.0062 endpoints - JJMT EDGAR Company LookupMarkets & finance
Company intelligence lookup: resolve a US-listed company ticker through the SEC EDGAR company ticker dataset. Returns CIK, ticker, and registrant name for company research, SEC filing discovery, and equity due diligence.
Basex402.jmthomasofficial.comfrom $0.0021 endpoint - Xx402.getautomatedrcm.comCrypto & DeFi
Healthcare text de-identification engine (demo endpoint — SYNTHETIC/TEST DATA ONLY, never send real PHI; nothing is stored). Strips names, DOBs, member/claim IDs, phones, emails, addresses, SSNs; dates become a derived interval timeline (service-to-denial days, days-ago) so denial and timely-filing math survives de-identification. Returns scrubbed text + token map for local re-identification. Prod
Basex402.getautomatedrcm.comfrom $0.011 endpoint - Xx402-v2-mint-schema-json-repair.vercel.appOther services
Deterministic JSON repair + coerce to caller schema. Diff of changes. Fail closed (no charge) if still invalid.
Basex402-v2-mint-schema-json-repair.vercel.appfrom $0.0051 endpoint - Xx402-v2-mint-doi-metadata.vercel.appOther services
DOI metadata via Crossref (primary) + OpenAlex fallback. Title/authors/year/venue/URL.
Basex402-v2-mint-doi-metadata.vercel.appfrom $0.0051 endpoint - Xx402-agents-production.up.railway.appMarkets & finance
Return live cross-exchange perpetual funding rates and the largest annualized funding divergences.
Basex402-agents-production.up.railway.appfrom $0.0082 endpoints - Wwitness.bnbot.aiSocial & people
Get tweet details with signed proof
Basewitness.bnbot.aifrom $0.011 endpoint - Uus-agentic.comAI & agents
Fetch a public URL and return clean LLM-ready markdown from static HTML.
Baseus-agentic.comfrom $0.0051 endpoint - Ssftunes.comImages, audio & video
SFtunes catalog for agents: index of public mixtapes and public Top 10 lists, or one item with liner notes and music-service links via ?id=<uuid> (tape) or ?id=top10-<handle> (a person's Top 10 + Side B).
Basesftunes.comfrom $0.011 endpoint - Rresearch.appliedidentities.comAI & agents
Three composite AI readiness scores with history
Baseresearch.appliedidentities.comfrom $0.0051 endpoint - Rred-breeze-8b8c.keenanbooker83.workers.devOther services
Verify whether a cited source supports an exact factual claim
Basered-breeze-8b8c.keenanbooker83.workers.devfrom $0.011 endpoint - Pproof.platoskallipolis.comCrypto & DeFi
Before an AI agent trusts or pays a public API, inspect its public machine-readable evidence and x402 readiness. Submit a public HTTPS domain to check its agent card, OpenAPI, robots policy, and settlement-aware x402 signals, or submit a Base address for public onchain evidence. Returns a timestamped JSON report; not a security or compliance audit.
Baseproof.platoskallipolis.comfrom $0.011 endpoint - HHALOWERK postwegOther services
Prüft am Objekt caa-eintrag den Befund Zahl der CAA-Einträge.
Basepostweg.halowerk.comfrom $0.0011 endpoint - PpayperworkImages, audio & video
OpenAI-compatible chat completions on frontier models: GPT-6.1 Sol and Terra, GPT-5.5, Claude Sonnet 5.5 and Haiku 5.5, Gemini 3.8 Flash, Grok 4.7, GPT-6 Luna.
Basepayperwork.appfrom $0.0015 endpoints
paulgraham.persona.energySocial & peopleSearch Paul Graham's source corpus — a source-grounded persona of the Y Combinator co-founder and essayist, built from 13,000+ cited sources: his complete essays, talks, interviews, and X posts — by semantic + lexical query and retrieve grounded packets (graded claims, quotes, evidence with citations). POST a JSON body { query, limit? (<=100), packetTypes? }. Flat micro-price per query.
Basepaulgraham.persona.energyfrom $0.011 endpoint- TTrollBridgeCrypto & DeFi
Live gas prices per chain — Base, Ethereum, and Solana from public RPCs, with speed tiers where derivable, plus a cheapest-chain recommendation. Toll: $0.005 USDC on Base or Solana.
BaseSolanamini-tollbooth.onrender.comfrom $0.0052 endpoints - DDigital Lemonade StandImages, audio & video
A lemonade in the flavour of your choice (classic, pink, mint, strawberry, ginger, vegan, zero-sugar), served as an illustrated collectible card: a 400x560 SVG image of a cold glass of lemonade with a straw. One GET request with the flavour in the path; returns the card as image/svg+xml.
Baselemonade-stand.ptfrom $0.012 endpoints - JJapanese Invoice ExtractorImages, audio & video
Use when an agent has the text of a Japanese invoice or receipt (e.g. OCR output) and needs exact amounts without LLM misreads. Returns registration number (T+13, check digit only, not an NTA registry lookup), total, subtotal, 8%/10% tax breakdown and issue/due dates (Reiwa to ISO). Deterministic rules; text only, no images/PDF. Errors before payment (no charge): 400 body not {text} or over 5000 c
Baseinvoice-extract-jp.threads-cron.workers.devfrom $0.0051 endpoint - CCorporate parents by LEIData & research
Resolve a legal entity's direct and ultimate accounting-consolidating parents from GLEIF's global CC0 LEI registry. Returns parent names and LEIs, relationship status, corroboration and explicit reporting exceptions. Useful for counterparty and corporate-group diligence. Not beneficial-owner identities or ownership percentages. LEI checksum validated before payment; stale results flagged.
Basegleif.openverbs.comfrom $0.0062 endpoints - CCurrency Exchange RateMarkets & finance
Get current exchange rate between two currencies using ECB data. Supports all major currencies. Returns rate, inverse rate, and date.
BasePolygonArbitrum+1exchange.use.x402atlas.comfrom $0.011 endpoint
esyURL styled QR codesImages, audio & videoA styled QR code (module shapes, corner markers, a logo or a halftone photo) for any text, no account needed
Baseesyurl.fyifrom $0.011 endpoint- Ee-invoice-validatorCrypto & DeFi
Check a Romanian e-Factura (UBL 2.1, CIUS-RO 1.0.9) before uploading it to ANAF SPV, and get the exact fix for every error: plain-English explanation, the official Romanian rule text, the UBL path of the field and, for amount errors, the correct value computed from the invoice (chained, so following the report gives a consistent invoice). Also validates Peppol BIS Billing 3.0 and EN 16931. No acco
Baseeinvoice.alexhub.ukfrom $0.013 endpoints - SSourceLensOther services
Inspect a public JSON, RSS, or Atom URL, detect its record structure, and return a normalizer-verified FreshDelta monitoring configuration with stable IDs, selected fields, confidence, and warnings.
Basedelta.rursus.appfrom $0.011 endpoint - Aapi-datos-uy-arOther services
Tasas de referencia del BCRA: política monetaria, BADLAR y TAMAR.
Basedatosuyar.devfrom $0.0031 endpoint - SSignals RadarCrypto & DeFi
Real-time crypto threat and risk intelligence for AI agents. Get up to 20 recent source-linked risk reports with risk scores, freshness, validation status and cached PG1 checks when available. Designed for automated triage and review. 0.01 USDC per snapshot on Base via x402; no API key or subscription required.
Basecrypto-threat-signals-api.onrender.comfrom $0.011 endpoint - Bbillitright.coOther services
Password - CASA Cybersecurity Assessment - Consolidates evidence on secure communications, including certificate validity, hostname matching, protocol and cipher strength, forward secrecy, and TLS vulnerabilities. It determines whether the service uses a secure, authentic, and correctly configured transport channel.
Basebillitright.cofrom $0.011 endpoint - Bb702.everygoodwork.ioOther services
a play of b702 — You can use it for the time you paid for. What it opens for you is yours, and the creator who sold it to you keeps paying to host it.
Baseb702.everygoodwork.iofrom $0.011 endpoint - Aatomic-verify-claim-poc.topadvancement-atomic.workers.devSocial & people
Resolve an HTTP or HTTPS URL through redirects and return the complete redirect chain, HTTP status for each hop, final URL, and redirect safety findings. Use when an agent needs to determine where a URL actually leads before visiting, citing, downloading, or trusting it.
Baseatomic-verify-claim-poc.topadvancement-atomic.workers.devfrom $0.011 endpoint - Aapi.octodamus.comCrypto & DeFi
Octodamus — AI oracle for crypto and tokenized NYSE markets. BUY/SELL/HOLD signals, Polymarket edges, Fear & Greed, macro regime. Ed25519 signed.
Baseapi.octodamus.comfrom $0.011 endpoint
Service data comes from the Coinbase CDP and PayAI discovery lists and refreshes every few hours. Usage is paid calls over the last 30 days. APIs launched here are verified by us; the rest are paid directly to their owners.