Explore APIs
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- CCompany Registry LookupData & research
French company lookup in the official SIRENE register (Annuaire des Entreprises) by SIREN, SIRET or company name. Returns legal name, active/ceased status, legal form, creation date, head-office address and NAF activity code in a schema shared across countries.
BasePolygonArbitrum+1companies.use.x402atlas.comfrom $0.058 endpoints - BBacon ServicesImages, audio & video
Use when an agent needs a web-ready image: shrinks a PNG, JPEG or WebP to a maximum width and converts it to WebP, keeping transparency.
Basebaconservices.comfrom $0.018 endpoints - Aapi.lastlookdata.comData & research
LastLook Data — current 30-year US Treasury yield (DGS30). Alias for /api/current?id=DGS30.
Baseapi.lastlookdata.comfrom $0.014 endpoints - EECB FX RatesImages, audio & video
Public holidays and business-day count for any of 200+ countries (and subdivisions) over a date range: holiday names, weekend rule, business days, next business day. For travel, deadlines, delivery and scheduling agents.
Basebase-token-check.vercel.appfrom $0.0112 endpoints - PPlaces & Local Business SearchSearch & web
Google Maps local business search by place name — find places by query and a free-text location (e.g. 'Austin, Texas'), no coordinates needed; returns Google's local-pack results as clean JSON.
BasePolygonArbitrum+1places.use.x402atlas.comfrom $0.026 endpoints
PaywallWatchSocial & peopleUse when an agent needs email validation, screening only, for an address from a form, a scrape or a CRM and must decide whether it is worth sending to. Screens the address: syntax, DNS mail exchanger, disposable domain, role account, free provider and common typos. It does not verify that the mailbox exists. A DNS failure answers 503 and is not charged.
BaseSolanaapi.paywallwatch.comfrom $0.0032 endpoints- Aapi.oassis.devSearch & web
Opens a browser session and returns the map of controls.
Baseapi.oassis.devfrom $0.0027 endpoints
sanctions.nsgoods.orgCrypto & DeFiSigned multi-chain OFAC SDN address screening (USDC on Base or Solana)
SolanaBasesanctions.nsgoods.orgfrom $0.0053 endpoints- SSupplier Payment Decision AgentAI & agents
Registers an RSA public key (2048-bit or larger, PEM) used to sign payment-decision requests. Keys are immutable per tenant; rotate by registering a new key_id.
Basesupplier-payment-verifier-production.up.railway.appfrom $0.0054 endpoints
Mearef - Mid-East reference dataSocial & peopleCentral-bank policy rates, VAT/GST rates and thresholds, statutory interest and minimum wages for 9 Middle Eastern countries including Saudi Arabia, United Arab Emirates, Israel, Qatar; also CPI, income, corporate and withholding tax, social contributions, holidays. JSON with value, unit, effective date, official source URL and last_confirmed; a country with no such rate says so. GET /v1/{country}
Basemearef.devfrom $0.0025 endpoints
Machina SportsData & researchResolves a provider id (api_football, sportradar, opta, entain, espn) or canonical machina URN to the entity it identifies, with all cross-provider ids attached.
Basemachina.pay.zeroclick.iofrom $0.012 endpoints
Afriref - Africa reference dataSocial & peopleCentral-bank policy rates, VAT/GST rates and thresholds, statutory interest and minimum wages for 34 African countries including South Africa, Nigeria, Kenya, Egypt; also CPI, income, corporate and withholding tax, social contributions, holidays. Official central-bank FX reference rates for EG, KE, NG, ZA. JSON with value, unit, effective date, official source URL and last_confirmed; a country wit
Baseafriref.devfrom $0.0025 endpoints- Xx402-domain-check.vercel.appSearch & web
Clinical trials search (ClinicalTrials.gov, NLM): filter by condition, intervention/drug, sponsor, status, location. Returns NCT id, title, status, phase, conditions, interventions, sponsor, enrollment, dates, locations summary, link. Not charged on errors.
Basex402-domain-check.vercel.appfrom $0.0120 endpoints - SSCRIPTMASTERLABSMarkets & finance
FRED economic data API. Fetch the latest official Federal Reserve economic-series value and metadata by FRED series ID.
Basesqueezeos-api.onrender.comfrom $0.00166 endpoints - AAlgebra and Geometry SolversOther services
Complex number arithmetic, modulus and argument, integer powers, square root and n-th roots, in rectangular and polar form.
BaseSolanaPolygon+1math-geometry.x402tookit.comfrom $0.0211 endpoints - EElectronics CalculatorsImages, audio & video
Battery runtime estimate from capacity (mAh and volts, or Wh) and load (mA or W), with efficiency and usable depth of discharge.
BaseSolanaPolygon+1electronics-calc.x402tookit.comfrom $0.0211 endpoints - PPerp Derivatives SignalsCrypto & DeFi
Most extreme perp funding right now across Hyperliquid, filtered by open interest. Top crowded longs and shorts.
BaseSolanaPolygon+1derivatives.x402tookit.comfrom $0.0211 endpoints - CCompany EnrichmentSocial & people
One-call company snapshot from SEC data: profile, filing freshness, red-flag filings, insider filing count and LEI.
BaseSolanaPolygon+1company-enrichment.x402tookit.comfrom $0.0211 endpoints - CChemistry CalculatorsMarkets & finance
Bond type between two elements from the Pauling electronegativity difference: nonpolar covalent, polar covalent or ionic.
BaseSolanaPolygon+1chemistry-calc.x402tookit.comfrom $0.0211 endpoints - Ddep.halowerk.comOther services
Calculates release intervals and inactivity from current registry timestamps. Missing facts are returned as null and named in unavailable_fields where applicable. Derived values disclose their method; source-backed values disclose source, time window and age.
Basedep.halowerk.comfrom $0.0039 endpoints - CCryptoPulseCrypto & DeFi
Verifiable track record for any Hyperliquid wallet from the public ledger, for copy-trading research and prop screening. Answers "what is this trader's win rate and drawdown", "which markets make their money", "how fresh is their activity". Per address: realized PnL, win rate and expectancy per closing order, profit factor, fees, per-market breakdown, equity curve, max drawdown, live positions, an
BaseSolanaRobinhood Chain+9cryptopulse.theaslangroupllc.comfrom $0.0315 endpoints
IXSCrypto & DeFiIXS Real world asset vaults — 6% yields, BlackRock exposure, tokenized on-chain
Baseapi-dev-v2.ixs.financefrom $0.0011 endpoint
Darkly EnergizedCrypto & DeFiCatalog of the macro liquidity series x402 serves (Fed net liquidity, global central bank balance sheets), with unit, source and update frequency ($0.01). Daily readings, not weekly: the Fed's weekly H.4.1 balance sheet is merged with the daily Treasury General Account and overnight reverse repo data, so the aggregate liquidity series update each business day instead of once a week.
Basedarklyenergized.comfrom $0.0114 endpoints
DEBYKOCrypto & DeFiCrypto perpetual futures screener that finds markets across 19 venues (Aster Perpetuals, Avantis, Binance USD-M Futures, Bitget Perpetual Futures, Bybit Perpetuals, Coinbase Global Derivatives and 13 more) by funding rate, open interest, price, basis, volume or data age with a DQL query, e.g. any(venues where funding > 0). Returns the matching instruments with each venue's value, its timestamp and
Baseapi.debyko.comfrom $0.0054 endpoints- CClinicalIntelPulseSearch & web
ClinicalTrials.gov lookup, deterministic. Answers "what is the status of NCT02142738", "recruiting phase-3 melanoma trials", "Pfizer trial pipeline". Single trial by NCT id (status, phase, sponsor, enrollment, dates, countries) or search by condition/sponsor with phase and status filters. Typed records straight off the official v2 API — no LLM, no key, public domain.
BaseSolanaPolygon+8clinicalintelpulse.theaslangroupllc.comfrom $0.0215 endpoints - CCompliAPICrypto & DeFi
Screen a website URL or domain against OFAC SDN and other global sanctions lists. Call before paying, advertising on, or integrating with a website to check for sanctions associations. Returns per-list matches with source URLs.
Baseapi.compliapi.comfrom $0.016 endpoints - Xx402-gateway-production.up.railway.appDeveloper tools
x402engine — Run code in isolated sandbox — Python, JavaScript, Bash, R (up to 5 min)
BaseEVM chain 4326Solanax402-gateway-production.up.railway.appfrom $0.0026 endpoints - TTransitPulseAI & agents
Rail/coach/ferry/cruise compensation eligibility — UK Delay Repay, EU Rail 2021/782 (25/50%), EU/UK ferry 1177/2010, EU coach 181/2011, US FMC cruise refunds (46 CFR 540, 3-day rule), Athens Convention ship baggage — plus honest answers for VIA, Amtrak, India TDR, Japan JR. Deterministic percentages, article-level citations, claim-deadline math, operator defenses. No LLM.
BaseSolanaPolygon+8transitpulse.theaslangroupllc.comfrom $0.0513 endpoints - SsupremeaiAI & agents
Probe a public HTTP(S) URL and report availability: up/down, HTTP status, and latency in ms. Use it to check whether another paid API or x402 service is alive before spending money calling it. Public internet targets only.
Baseagents.supremeai.cafrom $0.0034 endpoints - AAvasis Agent PlatformCrypto & DeFi
Ethereum mainnet gas tip for agents that send transactions: latest block number and age, base fee, eth_gasPrice, eth_maxPriorityFeePerGas and a suggested maxFeePerGas (2x base fee + priority), from one batched RPC call every 4 s. Long-poll with ?since=<seq>&wait=25. Prepaid meter price $0.0002/call (packs at /v1/meter); SSE at /v1/stream/tips.
Basepremium.35-171-220-195.sslip.iofrom $0.00113 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.