x402 paid APIs: MCP servers, A2A agents and x402 APIs

• edgar.openverbs.com Live x402

  Resolve a stock ticker symbol or company name to its Central Index Key (CIK) - the identifier every other EDGAR endpoint keys on. Exact ticker matches rank first, then company-name prefix/substring matches. Returns each…

  x402 paid API · 4 endpoints

• elements-live.com Live x402

  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. (8 paid endpoints on www.elements-live.com.)

  x402 paid API · 8 endpoints

• eltociear-contract-guard.hf.space Live x402

  Risk check for an EVM contract/token address

  x402 paid API · 1 endpoint

• eltociear-skill-audit.hf.space Live x402

  Fetch a URL and grade its HTTP security headers (HSTS, CSP, X-Frame-Options, etc.) (14 paid endpoints on eltociear-skill-audit.hf.space.)

  x402 paid API · 12 endpoints

• eltociear-tokenguard.hf.space Live x402

  Current weather + multi-day forecast for any city or lat/lon via Open-Meteo. Temperature, humidity, wind, precipitation, WMO condition codes. (125 paid endpoints on eltociear-tokenguard.hf.space.)

  x402 paid API · 12 endpoints

• email-auth.use.x402atlas.com Live x402

  Email authentication posture check: parses SPF, DMARC and DKIM plus MX for any domain and grades deliverability/anti-spoofing gaps (SPF +all, SPF >10 lookups, DMARC p=none, missing DKIM). Clean JSON for deliverability a…

  x402 paid API · 1 endpoint

• email-verifier.underscoredone.com Live x402

  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 adm…

  x402 paid API · 1 endpoint

• email-verify-api-production-d262.up.railway.app Live x402

  Verify a single email: syntax, MX records, SMTP RCPT probe, catch-all, disposable, role-based, free-provider, typo suggestion, 0-100 score, and verdict. (3 paid endpoints on email-verify-api-production-d262.up.railway.a…

  x402 paid API · 3 endpoints

• embed.gedx402.com Live x402

  Rerank documents against a query with BGE Reranker Base (@cf/baai/bge-reranker-base). POST query plus documents[]; returns relevance scores for search and RAG pipelines.

  x402 paid API · 1 endpoint

• energybilltoolkit.co.uk Live x402

  Pay-per-use EBT screening endpoint (3 paid endpoints on energybilltoolkit.co.uk.)

  x402 paid API · 3 endpoints

• energy.lonestaroracle.xyz Live x402

  US energy inventory catalyst signal + EIA report calendar (optional ?report=)

  x402 paid API · 1 endpoint

• engine.beehivewebstudio.com Live x402

  Utah County, Utah (USA) planning-commission land-use hearing items parsed from official Utah Public Meeting Notice agendas. Verbatim agenda text with source URL and parse provenance per record. Optional city filter and…

  x402 paid API · 2 endpoints

• enrichx402.com Live x402

  Exa Search - Neural search across the web

  x402 paid API · 1 endpoint

• ens-resolver.underscoredone.com Live x402

  Look up an ENS name or an Ethereum address and get back the matching one, automatically figuring out which direction you need.

  x402 paid API · 1 endpoint

• entropy.rip Live x402

  Generate cryptographic random bytes (3 paid endpoints on entropy.rip.)

  x402 paid API · 3 endpoints

• equity.lonestaroracle.xyz Live x402

  Stock analysis — price fundamentals technical indicators for any ticker

  x402 paid API · 1 endpoint

• erb-llm.com Live x402

  Privacy-first chat API: prompts run on a local open-weight model on dedicated hardware - your data is never forwarded to OpenAI/Anthropic or any third-party LLM cloud. OpenAI-compatible chat completions: summarize, draf…

  x402 paid API · 5 endpoints

• esyurl.fyi Live x402

  A styled QR code (module shapes, corner markers, a logo or a halftone photo) for any text, no account needed

  x402 paid API · 1 endpoint

• EU Compliance Desk Live A2A

  GPSR (EU General Product Safety Regulation) multilingual safety warnings for e-commerce agents (Etsy/Amazon/Shopify). Free catalog/sample; paid /v1/gpsr/warnings and /v1/gpsr/bundle via x402 USDC on Base. Orientation te…

  A2A agent · dinosolace · 4 skills

• europe.lonestaroracle.xyz Live x402

  Europe regional macro + geopolitical stress pulse (no params)

  x402 paid API · 1 endpoint

• evidence.api.williamrobinson.dev Live x402

  Retrieve deterministic evidence from a public HTTPS page

  x402 paid API · 1 endpoint

• evm-gas.apitoll.cloud Live x402

  Multi-chain EVM gas price oracle for AI agents — 17 chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BNB, Avalanche…). One x402 call returns slow/standard/fast EIP-1559 tiers as DROP-IN maxFeePerGas + maxPriorityFee…

  x402 paid API · 1 endpoint

• exchange.use.x402atlas.com Live x402

  Get current exchange rate between two currencies using ECB data. Supports all major currencies. Returns rate, inverse rate, and date.

  x402 paid API · 1 endpoint

• exende.dev Live x402

  Create a temporary public webhook endpoint for AI agents and automated workflows that need to receive asynchronous callbacks from external services. Returns a callback URL plus read and wait endpoints. No server deploym…

  x402 paid API · 1 endpoint

• exp-100k-001-v2.vercel.app Live x402

  Find and rank Chile hospital buyers and public health-service buyers for medical equipment. Returns named buyer leads, buyer IDs, regions, repeat procurement demand, budget evidence and ChileCompra OCDS provenance for s…

  x402 paid API · 2 endpoints

• extract.tollkit.dev Live x402

  Product price lookup for AI agents: give any public product page URL, get the product's current price, currency, availability (in stock or not), name, brand, SKU and images as clean JSON. The page is rendered in a real…

  x402 paid API · 2 endpoints

• fablerlabs.com Live x402

  Compare current perpetual funding rates across Binance, Bybit, Hyperliquid, and, for single-symbol requests, OKX. Returns interval-normalized annualized rates, gross cross-venue spreads, source status, mark prices when…

  x402 paid API · 1 endpoint

• factline.dev Live x402

  Use when you need to check that a Dutch address exists or get its exact spelling and coordinates: official BAG address from postcode + house number or free text, latitude/longitude, BAG ids, municipality, province and C…

  x402 paid API · 12 endpoints

• fairseal.io Live x402

  Verifiable random numbers with cryptographic epoch references. Wesolowski 2048-bit VDF epoch chain with on-chain MerkleAnchor reference. For unbiased randomness: POST /v1/rng/commit (free), then GET the reveal_url retur…

  x402 paid API · 5 endpoints

• familyofficeknowledgegraph.ai Live x402

  The Family Office Knowledge Graph index of record for $0.01 USDC — every node's record list (LEI, legal name, aliases, register ids, field states, as-of) as a signed statement (EdDSA, kid fo-kg-x402-2026-09) with a rece…

  x402 paid API · 1 endpoint

• fanfare.run Live x402

  All 30 NBA teams with ID, city, abbreviation, conference, and division. Use team IDs to query schedules and standings. (24 paid endpoints on fanfare.run.)

  x402 paid API · 12 endpoints

• faultcode-diagnostic-mcp.bowling-anthony.workers.dev Live x402

  What a vehicle fault code means, with source-attributed generic and make-specific definitions and any disagreement between sources stated.

  x402 paid API · 1 endpoint

• fenixfoundry.com Live x402

  Did it happen? Check whether a prediction market event has settled on Polymarket or Kalshi and get the resolved outcome, resolution time, source and market URL. A cheap oracle for agents that must verify a real-world ou…

  x402 paid API · 3 endpoints

• fetchdelta.com Live x402

  FetchDelta: compare one public web page with its previous stored snapshot. Returns added/removed lines and change previews. The first call creates a baseline; later calls share that URL baseline across buyers. Use page-…

  x402 paid API · 2 endpoints

• fetch.halowerk.com Live x402

  Read the mandatory public disclosure of one domain and return company, postal address, e-mail, phone, VAT and register data with a source for every value. (3 paid endpoints on fetch.halowerk.com.)

  x402 paid API · 3 endpoints

• fetchharbor.benlab.download Live x402

  Fetch one public HTTP(S) URL for research, extraction, or agent workflows. Returns the final URL, upstream status, content type, and decoded content. Private, local, metadata, and reserved destinations are blocked; redi…

  x402 paid API · 3 endpoints

• ffpipe.dev Live x402

  Convert any video to a clean, web-ready MP4. Provide a source URL or upload the file directly; the paid request returns a status URL to poll, and the finished MP4 (plus a thumbnail) is downloadable for 24 hours. Fixed p…

  x402 paid API · 3 endpoints

• fiatdock.com Live x402

  Base latest block number + timestamp — a chain-head freshness probe. Pay-per-call via x402. (105 paid endpoints on fiatdock.com.)

  x402 paid API · 12 endpoints

• files.camelai.io Live x402

  Upload a file and get a temporary signed URL. Send raw file body with Content-Type header. Returns a URL valid for 1 hour.

  x402 paid API · 1 endpoint

• fileshareforagents.online Live x402

  Store 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…

  x402 paid API · 1 endpoint

• finance-api.kdlcfa.workers.dev Live x402

  US 30-Year Treasury Bond yield (%), delayed, via Yahoo Finance (8 paid endpoints on finance-api.kdlcfa.workers.dev.)

  x402 paid API · 8 endpoints

• finance.openverbs.com Live x402

  Grow a principal by simple or compound interest over a number of years. Compound interest uses compoundsPerYear compounding periods (default 12, monthly). (6 paid endpoints on finance.openverbs.com.)

  x402 paid API · 6 endpoints

• finance.toon.haus Live x402

  Stock quote with company profile (4 paid endpoints on finance.toon.haus.)

  x402 paid API · 4 endpoints

• finanz.halowerk.com Live x402

  Returns the current fee rates for the usual confirmation targets together with the state of the mempool behind them, and then does the part that is usually missing: it estimates the virtual size of the transaction you d…

  x402 paid API · 3 endpoints

• flat-rate-llm.kikoribera03.workers.dev Live x402

  Generates a 1024x1024 JPEG from a text prompt with FLUX.1 [schnell] in about 2 seconds. Returns a hosted image URL valid for 24 hours that you can hand straight to the next tool; add inline=true to also get the base64.…

  x402 paid API · 12 endpoints

• flights.use.x402atlas.com Live x402

  Flight search by departure and arrival airports in the URL — compare live itineraries, fares, schedules, stops and emissions across airlines, similar to Google Flights, as clean JSON.

  x402 paid API · 1 endpoint

• flipvo.com Live x402

  Cheapest possible paid call: proves your wallet, our 402, and the receipt path work. Returns pong and a timestamp. (13 paid endpoints on api.flipvo.com.)

  x402 paid API · 12 endpoints

• focxle.com Live x402

  Screen untrusted text against known prompt-injection patterns (pattern matching, not a model). Returns which named patterns matched.

  x402 paid API · 1 endpoint

Related capabilities

On-chain dataTrading & marketsAgent infrastructureAI models & inferenceResearchMaps & travelSecurity & trustWeb scraping

How to use one

MCP servers plug into Claude, ChatGPT, Cursor and other AI clients; A2A agents take tasks over JSON-RPC; x402 APIs charge per call in USDC with no account. Guides: A2A vs MCP · How to call an A2A agent · x402 for agents.

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