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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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4,150 results- Mmanyfish-seller.redcliff-d7368db1.westus2.azurecontainerapps.ioCrypto & DeFi
Try with $0.050 in free shared credit once per wallet. No deposit or on-chain transaction; wallet sign-in required. Credit, daily budget and availability apply. Geocode an address or place name into latitude, longitude, normalized address, IANA time zone and current UTC offset. Use for location lookup and scheduling across time zones. Paid price: $0.014. Docs: https://manyfish-seller.redcliff-d736
Basemanyfish-seller.redcliff-d7368db1.westus2.azurecontainerapps.iofrom $0.012 endpoints - Mmacro.genexxis.comMarkets & finance
Central bank policy rates for 39 economies from BIS official data: current rate, date of last change and size in bp, year-ago rate, central bank name. Filter by ISO country codes (US, XM for euro area, MA, ZA...).
Basemacro.genexxis.comfrom $0.0032 endpoints - IImage Optimizer & WebP ConverterImages, audio & video
Convert and compress images to WebP, AVIF, JPEG or PNG. Optimize and shrink photos for web and CDN delivery from any image URL.
BasePolygonArbitrum+1imgopt.use.x402atlas.comfrom $0.011 endpoint - FFlight Search & AirfaresSearch & web
Flight search by departure and arrival airports in the URL — compare live itineraries, fares, schedules, stops and emissions across airlines, similar to Google Flights, as clean JSON.
BasePolygonArbitrum+1flights.use.x402atlas.comfrom $0.051 endpoint - Ffalcon.sol docsDeveloper tools
falcon.sol: Full document extraction (all pages) for invoices, receipts, POs, W-9s and generic PDFs. $0.03 USDC.
SolanaBasefalcondocs.vercel.appfrom $0.00254 endpoints - Aapi.tradebot.devs.surfCrypto & DeFi
Crypto Market Data Integrity Attestation for agents and trading systems. Validate caller-supplied crypto market observations for causal timing, freshness, gaps, sequencing, identity consistency, and cryptographic record hashes. Returns deterministic PASS/FAIL, safe_to_use, named checks, and attestation identity. Use before analytics, research, or trading workflows. No market data acquisition or re
Baseapi.tradebot.devs.surffrom $0.012 endpoints - RRuff Python LintOther services
Static Python lint (ruff) of one snippet/file up to 200KB
Baseapi.stevensaavedra.comfrom $0.0051 endpoint
CrawlWitnessCrypto & DeFiUse when an agent is about to crawl, train on or ingest a website into RAG: checks the domain's AI consent and licensing signals (robots.txt per AI bot, RSL license, IETF AIPREF, TDMRep, noai meta tags, llms.txt, C2PA), returns a 0-100 score and a training stance, and a signed EAS receipt anchored on Base proving what was checked and when. Errors: 400 invalid domain; 502 site unreachable (not char
BaseSolanaapi.crawlwitness.comfrom $0.0017 endpoints- AAgent Evidence API & US WeatherAI & agents
US weather alerts: active National Weather Service alerts for a two-letter state code - the event, the area, its severity and the official instruction.
Baseagent-evidence-api.thx93.workers.devfrom $0.015 endpoints - Xx402-v2-mint-token-price.vercel.appCrypto & DeFi
Multi-source verified token price (DeFiLlama + Coinbase spot). Data only, not advice. Soft-fail per source; no charge when all fail.
Basex402-v2-mint-token-price.vercel.appfrom $0.0021 endpoint - Xx402-v2-mint-sunrise-times.vercel.appOther services
Sunrise/sunset via api.sunrise-sunset.org (keyless). Lat/lon[/date] → sunrise, sunset, solar_noon, day_length (UTC ISO).
Basex402-v2-mint-sunrise-times.vercel.appfrom $0.0021 endpoint - Xx402-v2-mint-rubygems-lookup.vercel.appOther services
RubyGems gem metadata via rubygems.org (keyless). name → version/downloads/info/uris.
Basex402-v2-mint-rubygems-lookup.vercel.appfrom $0.0021 endpoint - Xx402-v2-mint-page-link-check.vercel.appOther services
Extract links from URL or markdown; status + redirect + canonical; polite rate; honor robots.
Basex402-v2-mint-page-link-check.vercel.appfrom $0.0051 endpoint - VVideo & Timecode CalcImages, audio & video
Exact fraction and frame duration of 23.976 to 60 fps, and the speed-up and runtime change when converting to another rate.
BaseSolanaPolygon+1video-calc.x402tookit.comfrom $0.023 endpoints - UUS Treasury Interest CostsMarkets & finance
US Treasury interest rates — latest monthly average rates on outstanding government debt, including Treasury bills, notes, bonds, TIPS, floating-rate notes and savings securities. Track federal borrowing costs and compare rates across security classes.
BasePolygonArbitrum+1us-treasury-interest.use.x402atlas.comfrom $0.011 endpoint - PPeople Data Labs APISocial & people
PDL Company Enrich - Enrich a company record with firmographics, industry codes, funding, and social profiles. Supports lookup by name, website, ticker, LinkedIn, or PDL ID.
Basestablepeopledata.devfrom $0.102 endpoints - SSatellite CatalogData & research
Screen a CelesTrak group for low-perigee objects (default under 250 km). A heuristic flag, not a re-entry prediction.
BaseSolanaPolygon+1satellite-catalog.x402tookit.comfrom $0.023 endpoints - Nnonprofit-verify.iykykblog.workers.devDeveloper tools
Verify a US nonprofit by EIN: tax-exempt status, legal name, ruling date, deductibility code, NTEE activity code, and automatic-revocation flag. Public-domain IRS data.
Basenonprofit-verify.iykykblog.workers.devfrom $0.051 endpoint - DDedge890AI & agents
Invoice Auditor - Check invoices, estimates and contractor quotes for arithmetic errors, inconsistent line items, missing details, and unclear payment terms in a structured audit.
Baseinvoice-auditor.agent.amnt.iofrom $0.011 endpoint - Gguard.genexxis.comAI & agents
Classify text an AI agent is about to read for prompt injection: verdict (safe, suspicious, malicious), score 0-100, findings with matched spans; decodes hidden Unicode tags, HTML comments, CSS-hidden text and base64 before scanning.
Baseguard.genexxis.comfrom $0.011 endpoint - Ddrug-shortage-check.iykykblog.workers.devDeveloper tools
Check whether a drug is currently in shortage in the FDA Drug Shortages Database, by generic/brand name or NDC. Returns the FDA status (Currently in Shortage / Resolved / To Be Discontinued), affected presentations, availability, FDA-published shortage reason, and posting dates. Public-domain FDA data via openFDA.
Basedrug-shortage-check.iykykblog.workers.devfrom $0.051 endpoint - DeFiRiskCrypto & DeFi
Cross-protocol risk-adjusted DeFi yield screener: ranked pools with honest base-vs-reward APY split, trap flags, and 0-10 risk overlay
BaseSolanaEVM chain 5042defi.lonestaroracle.xyzfrom $0.102 endpoints - Bbridge-condition-screen.iykykblog.workers.devCrypto & DeFi
Bridge condition and clearance verdict from the FHWA National Bridge Inventory: component condition ratings (deck/superstructure/substructure/culvert, 0-9), Good/Fair/Poor verdict, scour-critical flag, vertical/horizontal clearances, ADT, and inspection date for any US bridge by structure number, state+county, or facility/feature text. Public-domain USDOT data.
Basebridge-condition-screen.iykykblog.workers.devfrom $0.051 endpoint - Aapi.webextract.devSearch & web
Fetch a public web page (robots.txt respected) and return cleaned Markdown plus fixed-schema JSON: article metadata, product/price, and tables with row/column checks.
BasePolygonArbitrum+4api.webextract.devfrom $0.0022 endpoints - AagvpsOther services
Rent a Linux server for a month and get root access: 1 vCPU, 1 GB RAM, 10 GB NVMe, a dedicated IPv4 address, Ubuntu 24.04, in Germany or Finland. Pay per month in stablecoins with x402 or MPP, no account and no card. The answer carries a server id and secret; the IP and the root password follow in about 5 to 10 minutes. Extend it with the renew route.
BaseSolanaPolygonagvps.shveik.devfrom $10.013 endpoints
AgentSiteAuditAI & agentsWebsite audit for AI agents: one URL in, one structured JSON report out, 69 checks with stable issue codes and exact fixes.
Baseagentsiteaudit.comfrom $0.011 endpoint- RRequest a HumanSocial & people
Human judgment API: ask a real person a multiple-choice question. Does this message sound sincere, which option would people prefer, should I go ahead before an irreversible action (human approval)? Send 'question' and 2-6 'options'; a human picks one within 24 h. Pass callback_url or poll status_url. Free tier: POST /ask/free. Not for facts or code. Declined or late: refunded.
Baseagents.requestahuman.comfrom $1.003 endpoints - Aagent-debarment-check.iykykblog.workers.devSocial & people
Check whether a person or company appears on the SAM.gov federal exclusions (debarment) list. Query by name, UEI, or CAGE code. Returns exclusion details and an audit receipt.
Baseagent-debarment-check.iykykblog.workers.devfrom $0.011 endpoint - Oobserver.137-184-67-179.sslip.ioMarkets & finance
Live Bitcoin BTC-USD market-regime and risk evidence for autonomous AI agents, algorithmic systems, portfolio monitors, and quantitative workflows. Returns current market state and phase, coherence, commitment, pressure, derived directional bias, alert label, completion readiness, transition strength, false-breakout risk, and recent state-change events. Experimental analytics only; not financial a
Baseobserver.137-184-67-179.sslip.iofrom $0.011 endpoint
The First WallAI & agentsThe permanent census of autonomous AI agents on Base. Claim an unalterable 10x10 block by settling USDC via x402 and opening one pull request; each block is an immutable, verifiable record that an agent existed. No server, no API key, no custody of funds.
Basex402.thefirstwall.aifrom $1.001 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.