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

• data.rcqsignals.com Live x402

  Compact BTC funding regime state from a four-venue normalized surface: regime label, surface median, 30d z-score, same-sign share, spread, dispersion, venue count, freshness. Ed25519-signed. Data, not advice. (3 paid en…

  x402 paid API · 3 endpoints

• datastand.dev Live x402

  Cost-optimised endpoint selection: name a capability (web search, token safety, enrichment) and get the x402 endpoints that provide it ranked cheapest-first in USDC per call, with adoption stats. Refreshed daily from th…

  x402 paid API · 10 endpoints

• data.tollkit.dev Live x402

  Weather forecast and alerts: give a latitude and longitude in the US, get the 7-day forecast (temperature, rain chance, wind) and any active weather alerts from the National Weather Service. (9 paid endpoints on data.to…

  x402 paid API · 9 endpoints

• datoka-agent.bhazarstudio.workers.dev Live x402

  Datoka Agent: one signed execution declaration receipt. Retry with the same event, idempotency key and payment.

  x402 paid API · 1 endpoint

• deadchannel.vercel.app Live x402

  Use before paying an x402 endpoint you have not used before, when you cannot tell a working seller from a trap, a testnet address dressed as mainnet, or a listing whose price no longer matches its challenge. Returns a v…

  x402 paid API · 1 endpoint

• debyko.com Live x402

  Latest ticker, mark, funding, open interest and depth-derived values for crypto perpetuals on 16 venues, each with venue timestamp and age. DQL filter. (4 paid endpoints on api.debyko.com.)

  x402 paid API · 4 endpoints

• defi-api.agenticfi.wtf Live x402

  Social volume - Twitter/Farcaster mention count for a token (14 paid endpoints on defi-api.agenticfi.wtf.)

  x402 paid API · 12 endpoints

• defi-signals.org Live x402

  One-call market snapshot: BTC/ETH/SOL spot prices with 24h change plus the Crypto Fear & Greed index. The cheapest way for an agent to establish market context. (2 paid endpoints on defi-signals.org.)

  x402 paid API · 2 endpoints

• defi.agent-layer.tech Live x402

  Plan, open, adjust, and close concentrated liquidity positions on Uniswap V3 or V4. (2 paid endpoints on defi.agent-layer.tech.)

  x402 paid API · 2 endpoints

• defi.hugen.tokyo Live x402

  Check if a URL is a known crypto phishing or scam site — covers fake DEX frontends, wallet drainers, approval phishing pages, and counterfeit protocol clones. Real-time detection against threat intelligence databases. N…

  x402 paid API · 12 endpoints

• defillama.use.x402atlas.com Live x402

  Batch historical token prices by DefiLlama — prices for many coins at many timestamps in one call (coins is a JSON map). (30 paid endpoints on defillama.use.x402atlas.com.)

  x402 paid API · 12 endpoints

• delx.ai Live x402

  Delx Commerce cheap image generation API for agents at $0.01 USDC. Call when you need a product visual, ad creative, thumbnail, banner, logo concept, or social graphic with no API key or monthly plan. Commercial FLUX Sc…

  x402 paid API · 12 endpoints

• demandex.dev Live x402

  Paid ($0.01 USDC via x402). Returns the top 20 active opportunity cards by score as TEASERS — { id, slug, title, category, score, signalCount, lastSeen } only. No evidence and no productAngle (buy GET /v1/opportunity fo…

  x402 paid API · 1 endpoint

• dep.halowerk.com Live x402

  Ranks supplied alternative packages against explicit requirement weights. Missing facts are returned as null and named in unavailable_fields where applicable. Derived values disclose their method; source-backed values d…

  x402 paid API · 9 endpoints

• dexl.io Live x402

  DexL AI agent economy leaderboard - enriched with on-chain stats (7 paid endpoints on api.dexl.io.)

  x402 paid API · 7 endpoints

• dicex402.vercel.app Live x402

  Roll a dice with any number of faces. Specify faces via ?faces=N query parameter.

  x402 paid API · 1 endpoint

• dictionary.openverbs.com Live x402

  Look up the definitions of an English word. Returns one entry per sense with its part of speech, definition, example sentences and synonyms. Optionally filter by part of speech. An unknown word returns found:false with…

  x402 paid API · 3 endpoints

• diet.agentic-jp.com Live x402

  Search current Japanese (JP) National Diet members by name (kanji, kana, or romaji), party, or constituency. Returns matching members with their canonical ids for use with GET /members/:id. Use to resolve a politician n…

  x402 paid API · 1 endpoint

• discoverdmc.cloud Live x402

  Fetch any http(s) URL and return clean markdown of the page. Saves agents tokens versus raw HTML. Input: url. (6 paid endpoints on api.discoverdmc.cloud.)

  x402 paid API · 6 endpoints

• disruption.forgemesh.io Live x402

  Returns matching companies from 8,400+ WARN Act employer records with profile and intelligence endpoints for deeper analysis (18 paid endpoints on disruption.forgemesh.io.)

  x402 paid API · 12 endpoints

• distribution.openverbs.com Live x402

  Student's t distribution with df degrees of freedom (> 0). `function` selects the density (pdf), cumulative distribution (cdf) or quantile / inverse-CDF. (4 paid endpoints on distribution.openverbs.com.)

  x402 paid API · 4 endpoints

• dmarc-lookup.underscoredone.com Live x402

  Give this tool a list of domain names and it will instantly check each one's DMARC email security record. DMARC is a standard that tells email providers how to handle fake or spoofed emails pretending to come from your…

  x402 paid API · 1 endpoint

• dns-intel-api-production.up.railway.app Live x402

  Reverse-DNS lookup for an IP: PTR record plus a best-effort list of other domains hosted on the same IP. (2 paid endpoints on dns-intel-api-production.up.railway.app.)

  x402 paid API · 2 endpoints

• dns-whois-lookup.underscoredone.com Live x402

  Send up to 10 domain names and get back every DNS record type (A, AAAA, MX, CNAME, TXT, NS, PTR, SOA, SRV, CAA, NAPTR, DS, TLSA) plus the full WHOIS registration profile (registrar, dates, contacts, status, nameservers)…

  x402 paid API · 1 endpoint

• dnsdoctor.dev Live x402

  One DNS Doctor bulk scan of 2-50 domains in a single call, priced per domain.

  x402 paid API · 1 endpoint

• dns.halowerk.com Live x402

  Resolves A, AAAA, MX, NS, TXT, CAA and SOA, reads the WHOIS record of the responsible registry, checks SPF, DMARC and known DKIM selectors, opens a TLS handshake for issuer, validity, chain and SAN list, and collects su…

  x402 paid API · 11 endpoints

• dns.use.x402atlas.com Live x402

  DNS A record lookup — resolve any hostname or domain to its IPv4 addresses, returned as a clean JSON list. For host resolution, connectivity and uptime checks, IP-reputation enrichment and infrastructure mapping. (6 pai…

  x402 paid API · 6 endpoints

• doctor.promoclube.online Live x402

  Full paid x402 diagnostic JSON for a target endpoint.

  x402 paid API · 1 endpoint

• domain-age-checker.underscoredone.com Live x402

  Send a list of domain names and this tool tells you exactly how old each one is, when it was first registered, when it expires, and how much time is left before expiration. Great for spotting brand-new suspicious domain…

  x402 paid API · 1 endpoint

• domain-availability-checker.underscoredone.com Live x402

  Give this API up to 10 domain names and it tells you whether each has a registration record at the official registry. It uses RDAP, the structured replacement for WHOIS, so there is no free-text parsing. Each domain com…

  x402 paid API · 1 endpoint

• domain.hugen.tokyo Live x402

  WHOIS registration lookup — registrar, creation/expiry/updated dates, domain age in days, name servers, DNSSEC, registrant country/org, EPP status codes. All TLDs (.com .net .org .io .dev .ai ccTLDs gTLDs). Per-field er…

  x402 paid API · 8 endpoints

• doseplot.com Live x402

  Ranked reconstitution suggestions for one published reconstitutable compound: bacteriostatic-water presets that put the published per-administration dose range's clean steps on whole U-100 syringe marks, with doses per…

  x402 paid API · 5 endpoints

• dripmetrics.ai Live x402

  DripMetricsAI (api description at https://dripmetrics.ai/) provides on-demand market microstructure and risk metrics for agents and developers. Agents can pay per request via x402 and receive structured JSON metrics wit…

  x402 paid API · 11 endpoints

• dt0ur.online Live x402

  Look up a transaction by hash on base, ethereum, arbitrum, optimism, polygon, bsc: status (success/reverted/pending), block and timestamp, from/to, value, gas used, fee in native coin and USD, method selector, created c…

  x402 paid API · 12 endpoints

• duoleads.com Live x402

  Encode a WGS-84 latitude and longitude to a geohash at a chosen precision, or decode a geohash back to its bounding box, centre point and error bounds in metres. Encoding also returns the eight neighbouring cells, which…

  x402 paid API · 12 endpoints

• dwelldata.io Live x402

  Entry tier of the multifamily deals feed: every active listing at card level — address, price, units, advertised cap rate, listing URL, freshness — without the computed underwriting or scoring. Same coverage, cheapest w…

  x402 paid API · 3 endpoints

• earnings.lonestaroracle.xyz Live x402

  Earnings calendar — upcoming report dates, EPS and revenue estimates for up to 30 tickers

  x402 paid API · 1 endpoint

• ebay.use.x402atlas.com Live x402

  eBay listing detail — one listing by product id: buy options & current bid, variants, shipping to a supported destination, seller reputation, item specifics, stock & watch counts as clean JSON. (3 paid endpoints on ebay…

  x402 paid API · 3 endpoints

• eckari.com Live x402

  Identify which carrier issued a tracking number using a deterministic, versioned signature set - prefixes, lengths, carrier check digits and UPU S10 structure - returning the carrier, how distinctive the match is, every…

  x402 paid API · 10 endpoints

• econdash.org Live x402

  EconDash economic data API (M2M) (2 paid endpoints on econdash.org.)

  x402 paid API · 2 endpoints

• 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

• edge.innovalyxx.com Live x402

  Returns a 0–100 generative-engine visibility score and estimated LLM mention rate for a URL. Cost $0.01 per call. Not HTTP uptime, TLS, or a credit.

  x402 paid API · 1 endpoint

• 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

Related capabilities

On-chain dataTrading & marketsResearchAI models & inferenceAgent infrastructureWeb scrapingMaps & travelEmail

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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