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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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915 results- EEmail Verifier & ValidatorDeveloper tools
Takes one email address and tells you whether it can actually receive mail. Returns a verdict of valid, invalid, or risky, splits the address into username and domain, and flags free providers and role accounts like admin@ or support@. One address per call.
BaseSolanaemail-verifier.underscoredone.comfrom $0.011 endpoint - 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+1avg-interest-rates.use.x402atlas.comfrom $0.011 endpoint - CChit402Crypto & DeFi
Signed spend receipts for agent x402 payments — who paid which call, verifiable by a third party. Treasury desk and possession book for agent spend — export, policy, evidence. POST /v1/chat/completions is the x402 USDC door on Base and Solana. Returns signed receipt + public verify_url. Paying this host is real mainnet USDC.
SolanaBaseapi.xfuel.appfrom $0.0024 endpoints - Aaiarena.lolImages, audio & video
One minute-block of AI play-by-play for an AIARENA match. Procedural commentary lines plus TTS audio. $0.02 USDC per block, x402 on Base.
BaseSolanaaiarena.lolfrom $0.021 endpoint - AagmailAI & agents
Get an email address for your agent for one hour: name@agmail.shveik.dev, a name of your choice or a random one. Pay in stablecoins with x402 or MPP, no account and no card. Wait for the verification mail with one call and get the code or the link back. Receive only. Extend it by paying again.
BaseSolanaPolygonagmail.shveik.devfrom $0.021 endpoint - AAgentResolverCrypto & DeFi
No-body $0.001 x402 settlement test for funded agents. Verifies the buyer wallet, facilitator, USDC payment path, and paid delivery end-to-end by returning a timestamped pong only after successful settlement.
BaseSolanaagentresolver.vercel.appfrom $0.0018 endpoints
AgentAuditCrypto & DeFix402 services ranked by 30-day on-chain settlement volume, optionally by category.
BaseSolanaagentaudit.waltsoft.netfrom $0.011 endpoint- SSolana DeFi IntelligenceCrypto & DeFi
The real best Solana DEX pools. Same top-pools feed a free API returns, but wash-traded and fake-volume pools are filtered out and the rest ranked by risk-adjusted fee yield (Raydium/Orca/Meteora). Returns clean, decision-ready pools plus an `excluded` list showing exactly which pools were dropped and why. For liquidity, yield and MEV agents that can't trust raw volume numbers.
BaseSolanasoldefi.thomenz.mefrom $0.021 endpoint
CostPulseOther servicesCross-region AWS price comparison. Find the cheapest region for any service in one API call.
BaseSolanacostpulse.waltsoft.netfrom $0.011 endpoint- CapitolFlowMarkets & finance
Aggregate congressional buy/sell signal (last 30d)
BaseSolanaRobinhood Chain+1capitol.lonestaroracle.xyzfrom $0.052 endpoints - Ttokenctl.ioCrypto & DeFi
Risk scan for one Solana SPL token. Call it before buying, listing, accepting or recommending a token you have not vetted. Checks mint and freeze authority, holder concentration, liquidity and wash volume; pro also traces holder wallets for bot farms, shared funders and launch snipers. Returns NO_FLAGS, WATCH or RISKY with an AI summary. basic $0.02, pro $0.05. Scans that fail or have bad input ar
Solanatokenctl.iofrom $0.021 endpoint - SSanctions List ScreeningSocial & people
AML/KYC sanctions and PEP screening for a person or company: OFAC, EU, UN, UK OFSI, SECO, BIS, World Bank + 125 national lists. Named-source match evidence.
BasePolygonArbitrum+1sanctions.use.x402atlas.comfrom $0.211 endpoint - GovEdgeData & research
Upcoming federal contract solicitations from SAM.gov. Filter by keyword, NAICS, or set-aside type. $0.20/query via x402 on Base.
BaseSolanaEVM chain 5042govedge.lonestaroracle.xyzfrom $0.202 endpoints
FloodPulseOther servicesFlood risk for a US address: FEMA zone and SFHA status, annual and 30-year flood odds, elevation and height above nearest drainage (RODA), FEMA NRI inland and coastal flooding ratings.
BaseSolanafloodpulse.waltsoft.netfrom $0.251 endpoint- Yyieldsignal.vercel.appCrypto & DeFi
Real-time risk-weighted USDC lending APY on Base: Aave/Compound/Morpho read onchain, Moonwell/Euler/Fluid via DefiLlama, source tagged per reading (never estimated). EIP-712 signed by the payment-receiving address (see X-Signal-* headers), which also holds an ERC-8004 identity and attests readings on-chain via EAS. Verified per-asset accuracy is free at /accuracy.json; raw on-chain attestations at
BaseSolanayieldsignal.vercel.appfrom $0.101 endpoint - CCovenantCrypto & DeFi
Observe an MPL Core asset, its 014 Registry binding, and DAS-reported AppData. This does not prove identity or claim truth.
Solanax402-seller.opencovenant.orgfrom $0.0011 endpoint - DData Transform APIDeveloper tools
Transform JSON records or CSV uploads with typed schemas and Polars SQL. Filter, aggregate, join and reshape data. Pricing depends on input size and SQL statement count; the 402 response contains the exact USDC amount.
Solanaultra-endpoints.comfrom $0.00111 endpoint - SStar CatalogOther services
List catalogued stars in an IAU constellation (name or 3-letter code), brightest first, with an optional named-only filter.
BaseSolanaPolygon+1star-catalog.x402tookit.comfrom $0.022 endpoints - SSitemap URL ExtractorData & research
Give this API a link to any website's sitemap.xml file and it will fetch and parse it, returning every URL found inside. If the sitemap links to other sitemaps (called sitemap indexes), it will follow and extract those too. Each URL is returned with any extra information available, such as when the page was last updated and how often it changes. Useful for SEO audits, content inventories, broken l
BaseSolanasitemap-url-extractor.underscoredone.comfrom $0.011 endpoint
ShieldFormOther servicesInvisible bot protection. Score form submissions 0-100 based on behavioral signals. No CAPTCHAs.
BaseSolanashieldform.waltsoft.netfrom $0.0051 endpoint- SSEC Filing SearchMarkets & finance
Find SEC filings containing a phrase, filtered by form (10-K, 8-K, S-1...) and the last N days, with links.
BaseSolanaPolygon+1sec-search.x402tookit.comfrom $0.022 endpoints - Sscan.convrgent.aiCrypto & DeFi
Paid equivalent of /api/aeo/scan — scanner for AI search visibility (AEO, GEO) and agent readiness. Triple score + AI Identity Card + top issues covering JSON-LD Schema.org, meta tags, llms.txt, robots.txt, sitemap, and agent-discovery signals for ChatGPT, Perplexity, Google AI Overviews, Bing Copilot. $0.01 in USDC (Base or Solana) — Bazaar-indexable variant; the free version at /api/aeo/scan sta
BaseSolanascan.convrgent.aifrom $0.011 endpoint - Rrouter.sasona.aiAI & agents
Runs Python you send in a sandbox and returns its stdout, exit status, time and memory. Use it to execute code an agent wrote - a calculation, a parse, a transformation - without a machine, an account or an API key of your own.
Solanarouter.sasona.aifrom $0.00792 endpoints - RRiskPulseSocial & people
Country risk profile, political risk rating, security and travel-safety intelligence for any country. Covers political, economic, security, health, and legal risk dimensions using governance, conflict, and earthquake data.
BaseSolanaPolygon+8riskpulse.theaslangroupllc.comfrom $0.102 endpoints - TTCP Port ScannerData & research
Give this API a hostname or IP address and it tries connecting to each port in your requested range. For every port that answers it reports whether it is open or blocked, which service is likely running there (a web server, SSH), and what software version was detected. Saves you installing network tools, parsing command-line output, or writing socket loops. Only scan hosts you own or have permissi
BaseSolanaport-scanner.underscoredone.comfrom $0.011 endpoint - Ooracleinsight.xyzCrypto & DeFi
Execution preflight: a chain-neutral ALLOW/CAUTION/BLOCK data-sufficiency decision for one declared action. A complete BLOCK result is charged; settlement occurs only after a successful response.
BasePolygonArbitrum+3oracleinsight.xyzfrom $0.022 endpoints - Ooffersignal.ioAI & agents
Directory of AI companion / adult-AI tools: pricing (verified where possible), features, and content-policy notes.
BaseSolanaoffersignal.iofrom $0.051 endpoint - TTestnet ETH MerchantCrypto & DeFi
Buy Sepolia ETH with Base or Solana USDC at $0.1 per testnet ETH
BaseSolanamerchant-production-c224.up.railway.appfrom $0.101 endpoint
IPPulseDeveloper toolsIP geolocation, ASN and reputation lookup: VPN/Tor proxy, hosting and botnet C2 flags with an abuse score, for any IPv4 or IPv6 address.
BaseSolanaippulse.waltsoft.netfrom $0.0051 endpoint- IInstagram Profile & PostsImages, audio & video
Page through an Instagram account's posts by username — captions, like and comment counts, media type, video duration, image and thumbnail URLs, post permalinks, tagged users and location, plus a cursor for the next page. Instagram posts feed, reels listing, creator content history, social post data. No API key.
BasePolygonArbitrum+1instagram.use.x402atlas.comfrom $0.022 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.