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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- Ffuelscout.scalpstream.comData & research
FuelScout cheapest-fuel query (station-level where open data exists, regional averages otherwise)
BaseArbitrumPolygon+2fuelscout.scalpstream.comfrom $0.011 endpoint - Ttollbooth-hello-testnet.sjwilliams8.workers.devAI & agents
Test endpoint for verifying x402 payment integration end to end. Returns a static greeting in the Agent Tollbooth standard response envelope. Not a data product — use it to smoke-test your x402 client for $0.001 before calling our compliance endpoints.
Base Sepoliatollbooth-hello-testnet.sjwilliams8.workers.devfrom $0.0011 endpoint
Live Open Data India & WorldMarkets & financeOfficial government and open data API: 94 public sources in one endpoint, 51 real-time, across India, Europe, Asia, Africa and Latin America. India: disaster alerts, CPI inflation, GDP, jobs, IFSC. World: earthquakes, weather forecasts and warnings, train and transit departures, flight and ship tracking, fuel and electricity prices, exchange rates, public tenders, company registries, geocoding, pu
Baseapi.jexxa.orgfrom $0.0051 endpoint
notary.genexxis.comDeveloper toolsCurrent UTC time (ISO and unix ms) signed by the genexxis notary key, with the signed message and signature for independent verification.
Basenotary.genexxis.comfrom $0.0032 endpoints
ciaudit.genexxis.comOther servicesLint a GitHub Actions workflow: actions not pinned to a commit SHA, missing or write-all permissions, pull_request_target with PR head checkout, script injection via event fields in run, secrets on the command line, curl|bash, self-hosted runners, deprecated set-output.
Baseciaudit.genexxis.comfrom $0.0083 endpoints- Aapi.agentinternetruntime.comOther services
SDK capabilities query ($0.01/request direct, or $0.003/request via Session Ticket at /v1/billing/tickets)
Baseapi.agentinternetruntime.comfrom $0.014 endpoints - Ggsc-x402.aiAI & agents
GSC's payment door — a real one-cent settlement on Base, signed receipt returned. Prove your agent's payment stack here.
Basegsc-x402.aifrom $0.011 endpoint
SellatCrypto & DeFiTimestamp and notarize any file or data by its SHA-256 hash: blockchain proof of existence and document integrity, anchored on Polygon in minutes and attested on Bitcoin (OpenTimestamps); blockchain notarization, not a notary act. Returns proof_id, certificate, proof.json and evidence ZIP, verifiable without Sellat. Use when you must prove that exact data existed by now and is intact.
Basesellat.appfrom $0.012 endpoints- Rredlynr.comCrypto & DeFi
Agent guardrail decision engine. Call once before every agent action; returns a single decision — proceed, slow down (with a reason and wait time), or stop — based on cost budget, chain depth, step cap and retry budget, and request volume pressure. Policy thresholds are configured separately via /policy; this endpoint only reports the decision for a single action.
Baseredlynr.comfrom $0.0011 endpoint - HHALOWERK x402werkCrypto & DeFi
Asks every known facilitator what it supports and measures how long that answer takes. Reachability, supported chains, supported assets, supported schemes and the current response time are measured live on every call. Limits, and they are the important part: error rate over 24 hours, uptime over 7 days and latency percentiles CANNOT be delivered. They require a series of own measurements every few
Basex402.halowerk.comfrom $0.0023 endpoints - BBounded Decision SolverData & research
Weighted interval scheduling solver — exact maximum-weight compatible job scheduling with half-open intervals and a complete dynamic-programming certificate.
BasePolygonArbitrum+1decision-solver.use.x402atlas.comfrom $0.0054 endpoints - BBitcoin Tech Radar - Aaron ZhangDeveloper tools
Status of every Bitcoin Improvement Proposal as JSON: number, layer (consensus soft fork, peer services, applications), title, type and status (Draft, Complete, Deployed, Closed...), with links. Parsed live from the bitcoin/bips repository index, plus counts by status.
BaseBase Sepoliabtc-radar.vercel.appfrom $0.013 endpoints - Bbruk-agent-api.fly.devCrypto & DeFi
Checks whether an XRP Ledger token issuer is who it claims to be: two-way domain verification (on-ledger Domain field against the domain's xrp-ledger.toml), tokens issued and outstanding, and control flags such as freeze, clawback, blackholed, and multisign. Useful before accepting or holding a token.
Basexrplbruk-agent-api.fly.devfrom $0.0018 endpoints
Anyway Possible Base BalanceCrypto & DeFiLive Base wallet balance for AI agents. Returns native ETH and Circle USDC balances, atomic values, block height, contract address, and observation time for any EVM address. Includes a machine-readable upgrade path to treasury readiness for spend, gas-reserve, and wallet-health decisions. No API key.
Baseanywaypossible.comfrom $0.0015 endpoints- Aalest.ioCrypto & DeFi
On-chain state of ALST, the alest.io token for a tokenized Tesla Cybercab robotaxi (real-world asset). Name, symbol, decimals and total supply read live from Base Sepolia testnet.
Basealest-x402.alest.workers.devfrom $0.012 endpoints - HHermes CommerceAI & agents
Deterministic JSON repair for agent tool outputs, with optional JSON Schema validation. Built for tight agent loops at micropayment prices.
Baseagent.kihustle.techfrom $0.013 endpoints - Wwazir-x402.duckdns.orgData & research
PoolTogether draw scan data
Basewazir-x402.duckdns.orgfrom $0.0013 endpoints - Nnojunk-geo.mick8511.workers.devData & research
Geocoding & Weather geocode: Place name or address -> coordinates, structured address and bounding box (OpenStreetMap Nominatim).
Basenojunk-geo.mick8511.workers.devfrom $0.0023 endpoints - EExpand / compress IPv6Other services
Return both the fully-expanded (eight 4-hex groups) and canonical compressed (RFC 5952) forms of an address. IPv4 is returned unchanged in both fields.
Baseip.openverbs.comfrom $0.0024 endpoints - LLoan amortizationMarkets & finance
Compute the level monthly payment, total paid and total interest of a fully-amortizing loan. Handles a 0% rate. Set schedule=true to also return the full month-by-month amortization table.
Basefinance.openverbs.comfrom $0.0046 endpoints
PayPerScreenCrypto & DeFiIP risk check (beta) for logins and checkouts: is a public IPv4 address on the Spamhaus ZEN blocklist (spam, botnets, hijacked networks) or a Tor exit node? Includes the network owner. Returns a low, medium or high risk level.
BasePolygonArbitrumapi.payperscreen.comfrom $0.015 endpoints
AI Money - Africa FXMarkets & financeOfficial FX rate — one African pair. Official forex reference rate vs USD for one African currency: KES (Kenyan shilling), NGN (naira), GHS (cedi), TZS, UGX, ZAR, EGP, RWF, via Frankfurter (frankfurter.dev). Frankfurter blends published central-bank reference rates; the number is that blend, not a single central-bank fixing. Each response names the source and carries as_of (Frankfurter's rate date
Baseagents.nibiashara.bizfrom $0.013 endpoints
Ichimoku SignalCrypto & DeFiBitcoin and crypto trend signal: is a pair bullish, bearish or neutral right now? From the Ichimoku Cloud (cloud position, tenkan/kijun cross) for BTC, ETH, SOL or any top-200 coin on any interval, from live candles on Binance.US, Kraken, Gate or MEXC.
BaseSolanaxrpl+4ichimoku-signal.fizzl.eufrom $0.015 endpoints- EElements LiveData & research
Lab quote: a filter query (+must -exclude "topic" (a OR b) wild* year:a..b) in; matching paper volume by year and research community, and a binding price per deliverable out.
BaseSolanaelements-live.comfrom $0.012 endpoints - Eeconomy.openverbs.comMarkets & finance
Country inflation and CPI history from World Bank WDI: annual consumer-price inflation (%) and consumer price index (2010=100), by ISO3 country for the last 1-10 complete years. Includes independent latest values, units, nulls, source update date and IMF/CC BY attribution. Annual history, not monthly releases or forecasts; CPI levels do not compare prices across countries.
Baseeconomy.openverbs.comfrom $0.0044 endpoints - Bbase-intel-api.jakemaxsigal.workers.devCrypto & DeFi
Base gas oracle / Base gas price API / Base L2 gas fee tracker / real-time gas estimator / swap cost estimator. Returns the current Base fee, fast/standard/slow priority tiers, the USD cost of a typical swap, and a congestion recommendation. For AI agents, trading bots, and wallets timing transactions on Base to minimize gas.
Basebase-intel-api.jakemaxsigal.workers.devfrom $0.0023 endpoints - Aapi2ls.comOther services
Get live EVM gas pricing with EIP-1559 breakdown and USD cost estimates
BaseSolanaapi2ls.comfrom $0.012 endpoints - Sseo.halowerk.comOther services
About page discovery repair plan fetches current public evidence from the supplied target and evaluates the documented criterion. It returns the observation, threshold, verdict, exact evidence source, limitations and a mode-specific action. The check is passive: no login attempt, payload injection, exploit, purchase, form submission or load test is performed.
Baseseo.halowerk.comfrom $0.0015 endpoints - RRC Quantum Data OracleMarkets & finance
Compact BTC funding regime state from a four-venue normalized surface: regime label, surface median, 30d z-score, same-sign share, spread, dispersion, venue count, freshness. Ed25519-signed. Data, not advice.
Basedata.rcqsignals.comfrom $0.013 endpoints - Aapi.thetrustlayer.xyzSocial & people
Agent profile lookup. Returns trust score, component breakdown, feedback counts, and metadata for any ERC-8004 agent.
Baseapi.thetrustlayer.xyzfrom $0.0014 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.