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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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147 results- TTech DetectDeveloper tools
One HTTP request per host, matched against an in-house signature set. Every hit carries a confidence value from 0 to 100 and the evidence it rests on: response header, asset path, cookie name, meta generator, DNS or ASN record. Results are cached for 24 hours per host, so a repeat lookup of the same domain answers from cache.
Basestack.halowerk.comfrom $0.005106 endpoints
WebberSites x402 Data APICrypto & DeFiANTHROPIC-COMPATIBLE /v1/messages — Claude Haiku 4.5 through the exact Anthropic API dialect: same request/response shape, no Anthropic account, the x402 payment IS the auth. Point an Anthropic SDK's base_url at https://api.webbersites.com and pay per call. Caps: 16,000 input chars, 1,024 output tokens (max_tokens clamped), text-only, no streaming.
Baseapi.webbersites.comfrom $0.00123 endpoints
NansenCrypto & DeFiGet Smart Money Holdings Data
SolanaBaseX Layer+2api.nansen.aifrom $0.0160 endpoints- 33RouteCrypto & DeFi
Price a swap without building a transaction. Returns expected input, output, and gas without constructing an executable transaction. Quotes are informational and can change with liquidity and chain state.
BaseEVM chain 42793Solanaapi.3route.iofrom $0.0011 endpoint
ManyLives AIImages, audio & videoRead back values the paying wallet saved with /paid/memory/set: one key, or list your keys by prefix (keys, sizes and expiry, newest first). Another wallet can never see them. No free trial.
BaseSolanaapi.manylives.mefrom $0.00286 endpoints- Aagentbit.appSearch & web
Web search API for AI agents — find current information, news, documentation, competitors, prices or any fact that needs a fresh, citable source. Pay-per-call, no API key. Returns ranked results with title, URL, snippet, publish date and source from neural + keyword search over the live web, with automatic provider failover. Use when an agent asks: search the web, look up the latest on a topic, fi
BasePolygonArbitrum+2agentbit.appfrom $0.00197 endpoints - HHALOWERK formwerkOther services
Prüft am Objekt seite den Befund Übermittlung vor Einwilligung.
Baseformwerk.halowerk.comfrom $0.001100 endpoints
x402stockCrypto & DeFiThe total US public debt outstanding to the penny — the headline national-debt figure — split into debt held by the public and intragovernmental holdings, with the latest value, prior business day, day-over-day change, and recent history. No ticker needed. Updates each business day. Sourced from the US Treasury (FiscalData). Pass `?limit=` for more history (default 30, max 250). From x402stock
Basezeroclickagents.x402stock.xyzfrom $0.0197 endpoints- WWorld Clock / TimezoneImages, audio & video
World clock API — exact current time for any IANA timezone with UTC offset and correct daylight-saving handling. Deterministic on-chain execution by the AmanChain node — live consensus state, real blocks, pools and balances. Pay per call via x402 (USDC on Base), no account, no API key. POST JSON {"serviceId":"aman-world-clock","request":"<input>"}.
Baseamanchain-relay.gitajhd.workers.devfrom $0.00518 endpoints - AAetherCrypto & DeFi
Wallet balance on Base: the native ETH balance of any address, read live from the chain. Input: address
Baseaether-x402.vercel.appfrom $0.00122 endpoints - Hhandelsrechner_text_signalOther services
Freitext-Signal in ein strukturiertes Schema. Nur ausdrücklich gelieferte Richtung, Einstieg, Stop und Ziele; keine Ergänzung oder Signalerzeugung. Alle Zahlen, Kurse und Vorgaben liefert der Aufrufer. Keine eigenen Kursdaten, kein Brokerzugriff, keine Ausführung. Rechenwerkzeug, keine Anlageberatung, keine Empfehlung.
Basehandel.halowerk.comfrom $0.00251 endpoints
DataStore APIAI & agentsStore JSON or a file (up to 25 MB) privately for 7 days and hand it to a human or another agent with a signed link or a password-protected address. Includes 100 reads. No account needed: pay $0.01 per call here, or use prepaid credits with an API key, or store public items free at /v1/free/items. Docs: https://fileshareforagents.online/llms.txt
Basefileshareforagents.onlinefrom $0.011 endpoint- VVerifyLiteImages, audio & video
Web page to markdown for AI agents: fetch one URL and get its main content as clean, LLM-ready markdown (navigation, ads, footers and scripts removed) with title, description, language, word count and a token estimate. Uses the site's own Markdown version when it offers one. Useful for RAG, summarizing articles, research and feeding pages to an LLM. Not charged if the page can't be fetched or isn'
BaseEVM chain 5042Polygonverifylite.hydratinghealingtouch.workers.devfrom $0.00138 endpoints
CyreCrypto & DeFiCyre Gate — before your agent pays ANY other x402 service, grade the payTo counterparty + spend shape in one cheap call. Patterns, not verdicts. Agent guide: use before non-Cyre awal x402 pay. Agent guide: https://cyre.dev/SKILL.md
SolanaBasecyre.devfrom $0.00125 endpoints- CCrypto Wallet Sanctions (OFAC)Crypto & DeFi
Crypto wallet sanctions check (OFAC): is this blockchain address on the US Treasury OFAC sanctions lists? Exact match against all 1,000+ digital currency addresses OFAC publishes on SDN and Consolidated entries (Bitcoin, Tron, Ethereum and EVM chains, USDT, Litecoin, Monero and more), returning the listing's program and entry ID. Use before sending or accepting a crypto payment. No tracing or risk
BasexrplBase Sepolia+1api.stablecoingateways.comfrom $0.00114 endpoints - Aapi.newsgurus.aiCrypto & DeFi
News Gurus Intel API — US equity + crypto market regime now: TRENDING, MEAN_REVERTING or VOL_EXPANSION with confidence. Example: {regime: TRENDING, confidence: 0.74, reason: 'ADX 31 + VIX compression', vix_spot: 14.2, adx: 31}. Derived by a 40-source trading bot, refreshed intraday. Cheapest first call on this API and the standard 'trend day or chop day' check before sizing any trade. Educational
Baseapi.newsgurus.aifrom $0.00238 endpoints
ToolsmithImages, audio & videoKeyless web search for agents: pass a query, get a concise web-grounded answer plus the top source results (title, URL, snippet). Live web access, no API key or account needed. JSON response. $0.008 USDC per call, pay via x402, no API key.
Basetoolsmith-api.dassad10.workers.devfrom $0.0025 endpoints- Aapi.blockscout.comCrypto & DeFi
Access to api/v2/addresses/:address_hash/token-transfers. List token transfers involving a specific address with filtering options
BaseEVM chain 42220api.blockscout.comfrom $0.0027 endpoints - FForeverKaratDeveloper tools
One-day API key for a weather data API. A test product on the Agentify test channel; nothing real is delivered.
Base Sepoliatest.agentify.adfrom $0.0116 endpoints - RRooms by AurmadaSocial & people
Use it before you send to an address, or to screen sign-ups and leads for typos, disposable domains and role addresses. Checks syntax, MX records (with the A-record fallback), null MX, a list of about 120,000 disposable domains, role addresses (info@, support@…) and free providers, without sending anything. No SMTP probing, so it can't confirm the mailbox exists. Never charged for errors: we settl
Baserooms.aurmada.comfrom $0.00119 endpoints
CortexCloudCrypto & DeFiSpot USD price for a token/coin (CoinGecko where free tier suffices, else Alchemy). x402-paid.
Baseapi.cortexcloud.orgfrom $0.00415 endpoints- Xx402 Carbon Retirement APICrypto & DeFi
Entry point to the x402 Carbon Retirement API on Base. Returns every endpoint you need plus a live snapshot of the top 3 carbon classes and marketplace listings by liquidity. Discover, quote and certificate are free. Retiring is paid: each retirement costs the credit price plus a fee, sent from your own wallet (prepare/retire) or relayed from a signed USDC authorization (prepare-auth + POST action
Basex402.klimalabs.comfrom $0.0012 endpoints
Kakerapetit Japan Company DataImages, audio & videoEDINET filing calendar: annual securities reports (yukashoken hokokusho) filed by Japanese listed companies in a date range. Returns company code, EDINET document ID, fiscal period, accounting standard (JGAAP/IFRS/USGAAP) and the exact filing timestamp for each report — track new disclosures, trigger data pipelines, or find which Japanese stocks just reported. Query: /v2/calendar?from=2026-06-20&t
BasePolygonapi.kakerapetit.devfrom $0.00211 endpoints- HHyperNatt TerminalCrypto & DeFi
NattSwap cross-chain swap quote (Li.Fi)
BaseSolanahypernatt.comfrom $0.0012 endpoints - Aarchtools.devOther services
Parse RSS/Atom feeds into structured JSON. Pay per call with USDC (x402) or credits - archtools.dev
BasePolygonarchtools.devfrom $0.0118 endpoints - Xx402 Image ToolsImages, audio & video
Resize an image at a URL to a width, a height or both, keeping the aspect ratio inside the box by default (cover, contain, inside, outside or fill), optionally converting it. Returns a signed URL of the result, valid for an hour.
Baseimage.kagurazaka.devfrom $0.00110 endpoints - Xx402 Web ToolsImages, audio & video
Encode text or a URL as a QR code: PNG (base64 and a data URL) or SVG, with the size and error correction level you choose.
Baseweb.kagurazaka.devfrom $0.00110 endpoints
readfetch.comImages, audio & videoFetch a public URL and return its main readable content as Markdown or plain text, plus title, author, published date and site name. Strips navigation, ads and boilerplate. No JavaScript rendering by default (cheaper than readfetch_scrape); one Chromium fallback when plain HTTP is blocked. Prefer readfetch_fetch when you need raw status, headers, or non-HTML bytes; readfetch_scrape when the articl
Basereadfetch.comfrom $0.00312 endpoints- Xx402 AI ToolsImages, audio & video
Detects words and lines of text in a photo or screenshot (JPEG or PNG at a URL) with Amazon Rekognition, up to 100 words. Suited to signs, product labels and UI text; for documents use /v1/ocr.
Baseai.kagurazaka.devfrom $0.00212 endpoints
BytemineSocial & peopleRead any company page in real time and return clean structured content, links, metadata, and the detected tech stack. Data is fetched live from the source.
Baseagents.bytemine.aifrom $0.0150 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.