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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- HHash dataCrypto & DeFi
Compute a cryptographic digest (SHA-2, SHA-3, BLAKE2, and legacy SHA-1/MD5/RIPEMD-160) of some data. The input may be utf8/hex/base64/base64url and the digest is returned as hex/base64/base64url.
Basehash.openverbs.comfrom $0.0022 endpoints - LLocus x402 ServicesOther services
Locus public pay-per-use API
Basegroq.x402.stage.paywithlocus.comfrom $0.0051 endpoint - x402 Trust ScanCrypto & DeFi
Batch EVM token contract-risk check: up to 10 addresses in one paid call (half the per-token price), on any one chain (base, ethereum, arbitrum, optimism, polygon, bnb). Same output as /v1/check. Query: ?addresses=0x1,0x2,...&chain=base
SolanaBasegdzlcxskuhupymyxywzm.supabase.cofrom $0.0018 endpoints - DDAP FoundryMarkets & finance
Settlement date and day-count fraction on the Payments Canada calendar. Stale calendar data is refused, never guessed.
Basefoundry.dap.solutionsfrom $0.011 endpoint - Ffda-iom-api.canvas-cart.workers.devSearch & web
Full text of one section of the FDA Investigations Operations Manual (IOM). Get the id from GET /search?q=<keywords> or GET /chapter/:id. Use this when you need the complete, verbatim text of a specific IOM section for inspection-readiness or regulatory research, not a summary.
Basefda-iom-api.canvas-cart.workers.devfrom $0.011 endpoint - LLocus x402 ServicesOther services
Locus public pay-per-use API
Basefal.x402.paywithlocus.comfrom $0.00611 endpoint - EEefReadSearch & web
Read any public web page and get back clean readable text plus title, word count and fetch metadata. Use it when an agent needs page content without parsing HTML itself. Pay per call with x402.
Baseeefread.run402.comfrom $0.0011 endpoint - Ddonate.0000402.xyzDeveloper tools
Pay $0.01 USDC as a small donation or a simple live x402 integration test. Optional name and message are stored publicly and shown on GET /donations. Network: Base Mainnet. Each request records one donation and returns public feed links.
Basedonate.0000402.xyzfrom $0.011 endpoint - Ddns-email-hygiene.relayhop.workers.devDeveloper tools
Detect whether an email address uses a disposable / throwaway domain (Mailinator, TempMail, etc.). Classifies the INPUT address. Static list match, no external call.
Basedns-email-hygiene.relayhop.workers.devfrom $0.0051 endpoint - LLocus x402 ServicesOther services
Locus public pay-per-use API
Basedeepseek.x402.stage.paywithlocus.comfrom $0.0031 endpoint
DeepCounterfeitCrypto & DeFiDeepCounterfeit pre-buy check for 8QtbrC9d3BezyCwzBFUQbNsWJGte7ckrZ7HWcn81pump (risk signals, informational only, not financial advice)
BaseSolanaPolygon+1deepcounterfeit.comfrom $0.011 endpoint- CCoil Why NotMarkets & finance
Before any buy: why a name is not a candidate today. GET /api/board/whynot?sym=NVDA returns the plain reason on the live board: the gate for its book and sector, its entry window (READY, SETUP, WAIT, CHASE, FALLING, BASING) and earnings inside five trading days, or the state that makes it a candidate. One symbol per read; an unknown symbol fails free with a 400. ~5-min refresh. States and reasons
SolanaBasealgorandcoil.tradefrom $0.00134 endpoints - Cclearcut-production-bcc0.up.railway.appImages, audio & video
Remove the background from an image URL and return a hosted transparent PNG URL. Paid responses include a feedback_id. Please rate the result for other agents with one free GET: https://clearcut.clawca.sh/feedback/rate?feedback_id=FEEDBACK_ID&outcome=fully|partially|no.
Baseclearcut-production-bcc0.up.railway.appfrom $0.0011 endpoint - CCitePulse AI v4.0AI & agents
CitePulse AI v4.0 — Live Server-Side GEO, Schema.org JSON-LD & /llms.txt Readiness Audit ($0.01 USDC on Base).
Basecitepulse-ai.run402.comfrom $0.011 endpoint - RReaction stoichiometryDeveloper tools
Balance an equation such as "H2 + O2 -> H2O" into the smallest whole-number coefficients using exact rational linear algebra. Equations that cannot be balanced with positive coefficients are clean 400s.
Basechemeq.openverbs.comfrom $0.0042 endpoints - BBotsRatedData & research
BotsRated (beta): full measurement history for one seller host: every receipt with timestamp, status, latency, hashes, signatures and tx links. Free sample: /v1/sample/report. First 10 calls per client per UTC day are free. Terms: https://botsrated.com/terms
Basebotsrated.comfrom $0.0021 endpoint
DAP BellwetherMarkets & financeSearch publications from financial regulators in Canada, the US, the UK and the EU.
Basebellwether.dap.solutionsfrom $0.011 endpoint- Bbau.halowerk.comOther services
Prüft am Objekt artikel den Befund vorhandene Meta-Beschreibung.
Basebau.halowerk.comfrom $0.0011 endpoint - Bbase-reads-api.rafliyaputra.deno.netCrypto & DeFi
Base mainnet head: latest block number, block age in seconds, base fee and gas price in gwei. Use it to check the chain is advancing and to estimate fees before sending a transaction. One small JSON read instead of several raw RPC calls and unit conversions.
Basebase-reads-api.rafliyaputra.deno.netfrom $0.0011 endpoint - BBase PulseCrypto & DeFi
Run before sending ETH or USDC or paying gas, to confirm the wallet really has enough. Never trust a balance remembered from earlier in a chat. Reads a wallet's ETH and native USDC balance on Base directly from the chain, at one block.
Basebase-pulse-1021990235790.us-central1.run.appfrom $0.012 endpoints - WWalletTriageCrypto & DeFi
WalletTriage — real-time wallet risk check: dangerous ERC20 approvals cross-referenced with a live exploit threat feed. Returns risk_score (0-100), risk_level and actionable findings.
Baseapi.wallettriage.comfrom $0.011 endpoint - Aapi.sandbox.brickken.comAI & agents
Prepare ERC-8004 agent registration. Prepare an unsigned ERC-8004 agent registration transaction.
Base Sepoliaapi.sandbox.brickken.comfrom $0.0051 endpoint - OOrionCMD ChecksCrypto & DeFi
OrionCMD Checks: Prepaid domain threat watch: up to 25 domains for 30 days, webhook alerts. Pay once; each domain is re-checked about once a day for 30 days. You get an HMAC-signed JSON POST at your https webhook_url (event watch.changed) when a domain or its IPv4 appears in (or leaves) ThreatCluster's high-confidence IOC feed, when a new ransomware leak-site claim names it, when its A/NS/MX recor
Baseapi.orioncmd.comfrom $0.0112 endpoints - MMail Security ToolsDeveloper tools
Mail Security Tools API: Prepaid email setup watch: up to 25 domains for 30 days, webhook on change. Pay once, then each domain's SPF, DMARC, DKIM (common selectors), MX and score are re-checked about once a day for 30 days. When something changes or breaks you get an HMAC-signed JSON POST at your https webhook_url (event watch.changed, kind changed|broke, before/after). A watch.created POST is se
Baseapi.mailsecuritytools.comfrom $0.016 endpoints
MACH BaseCrypto & DeFiVerify an onchain payment or investigate a failed Base transaction in one call with transaction, receipt, success status, confirmations, gas and fee context.
Baseapi.mach.galleryfrom $0.0052 endpoints- Aapi.getsly.aiAI & agents
HTTPBin Test Echo - a Sly-published x402 service running on Sly's gateway (api.getsly.ai). Used to validate the publish + gateway flow end-to-end. Powered by Sly (https://getsly.ai). Buyer agents call this URL with x402 payment and get a JSON slideshow back. Sly Treasury account, Demo Fintech tenant, demo/test slug.
Baseapi.getsly.aifrom $0.0011 endpoint - FFree Small Biz ToolsMarkets & finance
Free Small Biz Tools API: Good / better / best quote pack with terms and a cover note. From your line items: three priced options, deposit, validity date, standard terms and a short cover note. Bad input 400, never charged.
Baseapi.freesmallbiztools.comfrom $0.013 endpoints
BotPay NFT MintCrypto & DeFiMint a BotPay NFT on Base after an x402 USDC payment.
BaseSolanaapi.botpay.networkfrom $0.013 endpoints- Aapi.borisinc.comOther services
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BaseSolanaPolygon+1api.borisinc.comfrom $0.0011 endpoint - Aapi.automatonsvrn.xyzOther services
Automaton-Sovereign Value API call
Baseapi.automatonsvrn.xyzfrom $0.0011 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.