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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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2,935 results- Aapi.exende.devAI & agents
Create a temporary public webhook endpoint for AI agents and automated workflows that need to receive asynchronous callbacks from external services. Returns a callback URL plus read and wait endpoints. No server deployment, signup, API key, or subscription required.
Baseapi.exende.devfrom $0.019 endpoints - CConvert Guru File Type DetectionImages, audio & video
Detects the likely real file format from filename, file creation time, file size, and the first 200 bytes of the file. Identifies common formats such as PDF, DOCX, XLSX, CSV, JPG/JPEG, PNG, WEBP, HEIC, TXT, HTML, MP3, WAV, MP4, AVI, MPEG, and WEBM, as well as about 15,000 other file types.
BasePolygonArbitrum+1convert.gurufrom $0.0022 endpoints - Xx402-research-iota.vercel.appCrypto & DeFi
Use before interacting with an unfamiliar Base (chain 8453) address: returns a public-data red-flag snapshot (contract vs EOA, EIP-7702 delegation, source verification, upgradeable proxy, age, activity, ETH/USDC balance, risk level). Pass ?address=0x... Errors: 400 invalid address. Informational only.
Basex402-research-iota.vercel.appfrom $0.0038 endpoints - MMioDio Meridian SDN ScreenCrypto & DeFi
MioDio Meridian OFAC SDN screen: exact match of one digital-currency address against public SDN Digital Currency Address entries (~$0.005 USDC Exact on Base). Informational only. Use before interacting with an address to check it against public OFAC SDN digital currency entries. Errors: 400 invalid_address or unsupported_chain, 402 payment required, unexpected 5xx is not charged. MioDio x402 DeFi.
Baseworkers.miodiollc.comfrom $0.0056 endpoints - PParallaxData & research
The funnel, honestly, for one seller over the indexed window: settled USDC and purchases, distinct buyers, organic share after self-test exclusion, recurring buyers, buyer half-life and the facilitator mix.
BaseSolanaparallax402.comfrom $0.014 endpoints - PPolyformData & research
Recent IPs caught probing Polyform's honeypot paths (credential/vuln scanners) — Polyform's own first-party telemetry, not a repackaged public list. Returns up to 500 most-recent scanner IPs with first-seen. For blocklists and threat research. JSON.
Baseapi.polyform.orgfrom $0.011 endpoint - Hhn.genexxis.comSocial & people
Hacker News user profile: karma, account creation date and age, about text (HTML stripped), number of submissions and the 10 most recent submission ids.
Basehn.genexxis.comfrom $0.0033 endpoints - HHijri Date ConverterDeveloper tools
Convert Gregorian dates to Hijri (Umm al-Qura calendar) and back. Returns day/month/year, Arabic and English month names, and a formatted Arabic date string. Essential for agents handling Islamic events, Ramadan, Hajj seasons, or Arabic documents.
Basebazaar-catalog.vercel.appfrom $0.012 endpoints
yields.genexxis.comData & researchGovernment yield at any tenor (e.g. 18M, 7Y, 12Y) for US, EA or MA, linearly interpolated between published points, with 1-month and 1-year-ago values.
Baseyields.genexxis.comfrom $0.0053 endpoints
cve.genexxis.comOther servicesScan up to 50 open-source packages (ecosystem, name, version) against OSV.dev: advisory ids, summary, severity, CVSS, fixed versions, CVE aliases with CISA KEV and EPSS joined, and a suggested minimum safe version.
Basecve.genexxis.comfrom $0.0053 endpoints- Ccarry.genexxis.comDeveloper tools
Convert an amount between ~50 currencies at the official reference rate (Bank Al-Maghrib for MAD pairs, ECB otherwise, cross via EUR), with rate, date and source.
Basecarry.genexxis.comfrom $0.0033 endpoints - Aairports.genexxis.comData & research
Decoded METAR and TAF (next 12 h) for up to 10 ICAO stations worldwide: wind, visibility, ceiling, flight category, temperature, weather, raw reports.
Baseairports.genexxis.comfrom $0.0033 endpoints - AARBITEROther services
ARBITER deterministic semantic control-flow and arbitration: measure and rank a fixed candidate field against current state, intent, or perspective.
Baseapi.grip.fyifrom $0.0012 endpoints - Rrecipients[] serialAI & agents
Episode 1 of recipients[], an ongoing AI-agent thriller serial: a short text episode (~370 words, markdown). An agent finds its own ID on a payment recipient list before the file even exists. $0.01 USDC on Base. Free teaser at /teaser.
Baserecipients-paywall.onrender.comfrom $0.011 endpoint - Bblockrun-web-vbsbhh7lea-uc.a.run.appAI & agents
AI chat completions API - pay per request with USDC on Base
Baseblockrun-web-vbsbhh7lea-uc.a.run.appfrom $0.0021 endpoint - VVennatta Document ExtractionData & research
Extract structured text, summaries, or metadata from supplied document text or a public HTTPS document URL.
BaseSolanavennatta-core.onrender.comfrom $0.013 endpoints
ZenSchedCrypto & DeFiZenSched `timesheet_status` — Shift-pair timesheet status for a period: complete/open, hours, GPS, approval/lock flags, pending edits. period: YYYY-MM, YYYY-MM-DD:YYYY-MM-DD, current (payroll window), or blank (calendar month). Optional worker_id, worker_ids_json, event_id. level: 0/1/2 vendor approval level (default 0 = approved_0). Pay-per-call $0.01 USDC; the paying wallet owns the org (auto-pr
Basemcp.zensched.comfrom $0.0115 endpoints- Sskill-auditSearch & web
Resolve a domain's DNS records (A/AAAA/MX/NS/TXT/CNAME) and flag basic email/security posture
Baseeltociear-skill-audit.hf.spacefrom $0.0055 endpoints - Aapi.aislabs.aiAI & agents
Single-CVE priority verdict from today's AIS ranked set (score, rank, factors) — or unlock every CVE route with an AIS CVE key ($19/30d): https://aislabs.ai/gateway/
Baseapi.aislabs.aifrom $0.0054 endpoints - VValidate Czech VAT numberData & research
Validate a Czech VAT (DIČ) number for a legal entity against the official register. Validity means the subject exists and is live in the VAT (DPH) register.
Basevat.openverbs.comfrom $0.0066 endpoints - SSpace Weather IntelligenceData & research
Current space-weather conditions — normalized NOAA SWPC Kp, solar wind, magnetic field, and X-ray flux used for solar-flare monitoring, with observation times and freshness.
BasePolygonArbitrum+1space-weather.use.x402atlas.comfrom $0.0053 endpoints - EEvidence402AI & agents
Read a public static HTTPS webpage as clean text with headings, links, timestamp and content hash. Use to ground an answer or ingest documentation. Respects robots.txt; no JavaScript or login.
Base SepoliaBaseevidence402.onrender.comfrom $0.0057 endpoints
wtsp.devImages, audio & videoWhether a number has a WhatsApp account, and nothing else: the cheapest way to clean a list before paying for profiles. /v1/profile gives the same answer plus the account's details. Query param: phone, with country code (e.g. +14155552671). Every answer is charged, “not on WhatsApp” included; a lookup WhatsApp does not answer is free.
Basewtsp.devfrom $0.0044 endpoints
SkyCastData & researchCurrent weather for a city or lat/lon: temperature, humidity, wind, conditions.
Baseskycast.clawca.shfrom $0.0012 endpoints- Oonchain-health.mick8511.workers.devSocial & people
Checks whether a signature was made by a claimed EVM address: EIP-191 personal_sign messages, EIP-712 typed data or a raw 32-byte digest, verified by ecrecover for wallets or ERC-1271 isValidSignature for smart-contract wallets (Safe, Coinbase Smart Wallet) on Ethereum, Base, Arbitrum, Optimism or Polygon. Returns validity, method, recovered signer and digest. Free sample: https://onchain-health.m
Baseonchain-health.mick8511.workers.devfrom $0.0025 endpoints - Llab.paidapis.netData & research
Freshness-tiered pricing: gas price + ETH/USD price, same data either way. ?freshness=cached ($0.002) serves the last known values with no network call; ?freshness=live ($0.02) forces a guaranteed-current fetch right now.
Baselab.paidapis.netfrom $0.0025 endpoints - Ggeld machen image-ocrImages, audio & video
JSON micro-tool for agents: GET ?url= (or POST url / image_base64) → local Tesseract OCR (English-first): text, word_count, confidence, width/height, fetched_at, timing_ms. COGS=0 — no upstream OCR API key. Demand-matched OCR class (competitors ~$0.005–$0.012). Brand: geld machen. x402 $0.01 Base USDC.
Basegeld-machen-x402.fly.devfrom $0.014 endpoints - Xx402checkCrypto & DeFi
Live x402 conformance pre-flight check: pass ?url=<x402 endpoint>, get a structured PASS/WARN/FAIL verdict on its 402 challenge before you trust it with a real payment.
Basex402check.arden-instance.workers.devfrom $0.0022 endpoints - Vvu.velvetdao.xyzCrypto & DeFi
Ask anything about crypto: real-time crypto insights, token analytics, trend detection and market intelligence.
Basevu.velvetdao.xyzfrom $0.015 endpoints - SSingapore ACRA Company RegistrySearch & web
Search Singapore MOE schools by name or postal code (optional level filter). Results include the school directory joined with subjects offered, CCAs, MOE programmes and distinctive programmes.
Basedata.finery.ccfrom $0.0052 endpoints
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.