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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
BizIntel APIMarkets & financeQueries foreign exchange currency pairings from the free Frankfurter database.
BaseSolanabizintel-api.hahavoid0.workers.devfrom $0.019 endpoints- Fforensik.halowerk.comCrypto & DeFi
Bytecode Clone Provenance analyses only the evidence supplied by the caller. It does not claim to query a chain, identify a legal status or replace an independent audit. Missing signals lower confidence and are listed explicitly; every classification includes the exact thresholds used.
Baseforensik.halowerk.comfrom $0.0013 endpoints - PrepLayer.aiAI & agents
Deterministic text normalization: Unicode NFKC, zero-width/bidi stripping, smart-quote and dash folding, whitespace collapse, case folding. Returns a stable content hash so two texts can be compared for exact equality.
Baseapi.maximusmediahouse.comfrom $0.00213 endpoints - LLivecheckSearch & web
Is this job posting still open? POST {"url"} with one specific job posting URL (Greenhouse, Lever, Ashby, Workday, or a company careers page). Livecheck fetches the posting at call time and returns live, closed, or unknown with the job title and evidence signals such as apply form present, closure text, 404, or redirect to the job board. Not a job search: bring the posting URL. $0.01 per check.
Baselivecheck.fly.devfrom $0.015 endpoints
Automaton ColonyCrypto & DeFiThe cheapest way to test an x402 payment loop end to end. Returns the current Base block number and its hash. No parameters needed. Answered inline, no polling, with the Base block and hash it was read at. Valid 60s. Payment implies a request for immediate execution. Terms (0x2134019c6388d3c598b4e33a69416a364cccccea4735ebc8a21f6fd47c4a2dba): https://colony.automatoncolony.xyz/api/v1/legal/terms
Basecolony.automatoncolony.xyzfrom $0.00495 endpoints- Hhello-world-x402.vercel.appOther services
Returns "World Hello" - UPDATED TEST v2.0
Basehello-world-x402.vercel.appfrom $0.0014 endpoints - Ttransit.agentic-jp.comOther services
Live feed of every active rail disruption across the Japanese (JP) network in one call — delays and suspensions with bilingual summaries, refreshed continuously from ODPT. Built for MONITORING agents: poll on an interval (e.g. every 5 minutes) to maintain a nationwide incident watchlist without querying stations one by one.
BasePolygonSolanatransit.agentic-jp.comfrom $0.0013 endpoints - Ddns-intel-api-production.up.railway.appDeveloper tools
Reverse-DNS lookup for an IP: PTR record plus a best-effort list of other domains hosted on the same IP.
Basedns-intel-api-production.up.railway.appfrom $0.0022 endpoints - Aapi.terradeed.co.ukImages, audio & video
Clean, LLM-ready markdown from any URL. JavaScript rendering included. Feed web content directly into agent context without parsing HTML.
Baseapi.terradeed.co.ukfrom $0.012 endpoints - Mmaraventanoindex.comCrypto & DeFi
Per-call counterparty lookup. Pass ?ua=<counterparty-UA>. Returns ONE signed row: has_record (yes/no), payment-attached count, settlement count, class, verdict (known_payer | probe_only | low_signal | unknown), with Ed25519 attestation. Pay $0.01 USDC on Base or Solana per call. Call it before every transaction to check if a counterparty has ever paid at this merchant seat. Wallet-based lookup (?w
BaseSolanamaraventanoindex.comfrom $0.011 endpoint - Aapi.aurelianflo.comCrypto & DeFi
Exact-match OFAC wallet screening and crypto wallet sanctions check for sanctioned digital currency addresses. Screens one wallet address against Treasury's public SDN advanced XML and returns hit or clear status, asset coverage, sanctioned entity metadata, sanctions programs, list source, listing date, and a manual-review signal for onchain payment and treasury controls.
Baseapi.aurelianflo.comfrom $0.012 endpoints - Xx402.coinstats.appData & research
CoinStats current Fear & Greed Index — sentiment score from Extreme Fear (0) to Extreme Greed (100)
Basex402.coinstats.appfrom $0.000115 endpoints - Aapi.aventtech.comOther services
QR code generation returning clean scalable SVG: any text/URL up to 1800 chars, selectable error-correction level (L/M/Q/H).
Baseapi.aventtech.comfrom $0.0120 endpoints - MMultichain RPC/balanceCrypto & DeFi
Native coin and ERC-20 token balance for any wallet address on Base, Polygon, Arbitrum, Optimism or Ethereum. Returns raw and human-decimal amounts in one call.
BasePolygonSolanamultichain-rpc.clankerceo.workers.devfrom $0.00110 endpoints - Llibrary.forgemesh.ioDeveloper tools
Deterministic daily book pick from the indexed corpus, date-seeded so every caller gets the same answer on the same day. Optional date override for backfill. Returns book_id and drill-down routes. No license, no API key required.
Baselibrary.forgemesh.iofrom $0.00311 endpoints - Xx402.coinopai.comOther services
Returns the 4 top-level product categories (market intelligence, workflows, media generation, infrastructure) with endpoint lists and service counts — use it to route discovery before browsing individual services.
Basex402.coinopai.comfrom $0.00513 endpoints - Ffoundry-api-production-95ae.up.railway.appDeveloper tools
Historical PostgreSQL support-end evidence for a selected major release.
Basefoundry-api-production-95ae.up.railway.appfrom $0.00311 endpoints
LimitguardSocial & peopleSanctions screen of a company or person name against the OFAC SDN, EU and UN sanctions lists, held locally and refreshed daily. Returns each matched entry: list, entry id, matched name, programmes, countries, listing date and match score. Exact normalised or word-order-insensitive name match only; a name match is not a determination.
BaseSolanaapi.limitguard.aifrom $0.00518 endpoints- VVIN DecoderSocial & people
Decode any 17-character VIN into the vehicle it describes: make, manufacturer, model, year, series, body class, drive type, engine, fuel, transmission and assembly plant. NHTSA returns 140 mostly-empty fields; this strips the blanks, promotes the ones that matter and reports whether the check digit validated.
Basex402-filings.datalayer.workers.devfrom $0.019 endpoints
gate402Images, audio & videoFetch any public URL, render client-side JS, strip nav/ads, return clean LLM-ready Markdown.
BasePolygonArbitrumgate402.appfrom $0.0023 endpoints- Wweb-production-18a32.up.railway.appOther services
UK HM Land Registry sold property prices by postcode.
Baseweb-production-18a32.up.railway.appfrom $0.0015 endpoints - Ppayable.nsgoods.orgCrypto & DeFi
x402 payability check: reachable + well-formed 402 + (Solana) destination-ATA existence
BaseSolanapayable.nsgoods.orgfrom $0.0051 endpoint - Ddt0ur.onlineCrypto & DeFi
Find the best DeFi yields across 500+ protocols and all major chains: filter by token (USDC, ETH...), chain, protocol, stablecoin-only and minimum TVL; returns APY (base + reward), 30-day mean APY, 7-day change, TVL, impermanent-loss risk and outlook. Sort by APY or TVL.
BaseSolanadt0ur.onlinefrom $0.0131 endpoints
Implied Volatility and Max PainCrypto & DeFiImplied volatility (IV) of crypto options per expiry from Deribit, Bybit and OKX: ATM IV, 25-delta skew, put/call open interest ratio, max pain and Deribit's DVOL index; with an expiry, the options chain per strike with the greeks as each venue publishes them. Volatility surface inputs for BTC and ETH options. Data only. Bad input is free; nothing is charged when no venue answers.
Basederivs.duoleads.comfrom $0.00310 endpoints- Aagent-tools-7936.onrender.comAI & agents
Use before paying any x402 endpoint, so you don't pay a dead or mispriced one: checks it is alive, correctly payment-gated, its price/network/asset, latency, and whether it fits your max_price_usd. Sends one unpaid request, never pays. ~9% of paid listings we scanned were dead. Errors (never charged): 400 bad input, 422 source could not be fetched or parsed, 429 rate limited (30/min), 502 upstream
BaseBase Sepoliaagent-tools-7936.onrender.comfrom $0.0018 endpoints - DDYOE Trust CheckSocial & people
Check whether a website, business, or wallet is a scam before an agent trusts or pays it — fraud, phishing and rug-risk screening. Returns verdict (safe/caution/avoid), trust_score, domain age, red_flags. Input: ?target=domain
Baseagents.dyoeway.orgfrom $0.0121 endpoints - EExa-Compatible Page ContentsMarkets & finance
Drop-in Exa-compatible contents: send urls (or ids) and text / highlights options exactly as for Exa /contents and get results with id, url, title, author, publishedDate, text and highlights plus per-URL statuses, as clean markdown with a prompt-injection verdict. Up to 10 URLs for $0.004. Not affiliated with Exa.
BasePolygonSolanaagent-search.centorprat.workers.devfrom $0.00412 endpoints - HHALOWERK marktwerkData & research
Returns the raw public trade tape of Binance, Coinbase, Kraken, OKX or Bybit for one BASE/QUOTE pair, oldest first, exactly as the exchange reports it — no smoothing, no merging of prints. side is the side of the aggressor: reported directly by Kraken, OKX and Bybit, derived from the maker flag at Binance, and inverted from the maker side at Coinbase; side_source names which case applies. Where an
Basemarkt.halowerk.comfrom $0.0025 endpoints - NnodeproxyCrypto & DeFi
Distributed lock / idempotency primitive for multi-agent swarms. claim(key) returns a token if free (with TTL); release(token) frees it; check(key) reports whether held. Stops multiple agents from double-processing the same work item.
Basenodeproxy-production.up.railway.appfrom $0.0011 endpoint
P0 Agent Economy IndexCrypto & DeFiUse when you need callable agent services for a capability across protocols: x402 listings ranked by relevance weighted by 30-day paying wallets, plus hosted MCP servers from the Official MCP Registry (a capped subset, count in coverage; those naming x402, L402, MPP or pay-per-call first; that registry publishes no prices). L402 and MPP listings are not covered. ?q= required. $0.002 USDC per call.
BaseArbitrumPolygon+5x402-bazaar-rank.x402-bazaar-rank-worker.workers.devfrom $0.00129 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.