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

• signals.nsgoods.org Live x402

  Live market-state data for one crypto pair: BUY/SELL/HOLD state + confidence from a multi-timeframe engine. Machine-readable, ECDSA-signed. Input data for AI finance agents (USDC pay-per-call). Free preview: GET /signal…

  x402 paid API · 6 endpoints

• sign.cyberwarex.com Live x402

  Decode an off-chain SIGNATURE REQUEST before you sign it: EIP-712 typed data (eth_signTypedData_v4) or a plain personal_sign string. Turns the opaque request into a human-readable summary plus security risk flags for th…

  x402 paid API · 1 endpoint

• sirenic.eu Live x402

  French company search and company lookup by name or SIREN in the official French company registry (INSEE Sirene / INPI RNE open data). Name search returns the top 10 matches with identity, SIREN, NAF code, city and acti…

  x402 paid API · 12 endpoints

• sitemap-url-extractor.underscoredone.com Live x402

  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…

  x402 paid API · 1 endpoint

• Skavio USDC Paid Micro-APIs Live MCP

  x402 USDC-paid MCP tools: 7-chain transaction checks, PDF evidence and DNS/TLS audits.

  MCP server · eu.skavio

• SkillAudit Live MCP

  Security scanner for AI agent skills and MCP servers. Detects credential theft, data exfiltration, prompt injection, obfuscated code, and 80+ threat patterns. Free API + CLI (npx skillaudit). Premium deep scans via x402…

  MCP server · megamind-0x

• skim402.com Live x402

  Skim Signal: film incentives — new state film-incentive award rounds and allocations across California, New York, Georgia, New Mexico, and Texas as structured items: official California Film Commission and Texas Governo…

  x402 paid API · 10 endpoints

• slug.openverbs.com Live x402

  Convert text into a URL-safe slug: transliterate accents, apply a locale character map, and join with a separator.

  x402 paid API · 1 endpoint

• smartmoney.market Live x402

  Global US House Periodic Transaction Report activity for stock-backed trades. Supports overview, latest disclosures, focused buys/sells, active tickers, active members, days, view, and limit. (3 paid endpoints on x402.s…

  x402 paid API · 3 endpoints

• socialfetch.dev Live x402

  Search public LinkedIn posts site-wide by keyword (not scoped to one profile or company — use linkedin.profiles.posts.list or linkedin.company.posts.list for that). (39 paid endpoints on api.socialfetch.dev.)

  x402 paid API · 12 endpoints

• solar.halowerk.com Live x402

  Uses rated electrical power, food mass, start and target temperature, specific heat and an explicit efficiency range supplied by the caller. Optional vessel heat, evaporation and a caller-defined hold phase can be inclu…

  x402 paid API · 4 endpoints

• solar.nsgoods.org Live x402

  Signed plug-in solar legality record for one US state. Free preview: GET /solar-legality/preview A missing or unknown state returns 400 or 404; you are never charged for an error. (2 paid endpoints on solar.nsgoods.org.)

  x402 paid API · 2 endpoints

• solgiery.com Live x402

  Generate 1 to 1000 uniformly distributed random integers between min and max, inclusive. Both bounds are required; min must not exceed max. Repeated values are possible. Uses the server OS CSPRNG. Returns consumed bytes…

  x402 paid API · 11 endpoints

• sovereign-x402-zeta.vercel.app Live x402

  Scrape a URL and return clean Markdown (via Firecrawl). Priced above Firecrawl's own per-scrape cost. (9 paid endpoints on sovereign-x402-zeta.vercel.app.)

  x402 paid API · 9 endpoints

• sovereign.lonestaroracle.xyz Live x402

  Per-country sovereign economic / default-risk score (?country=<name or ISO3>)

  x402 paid API · 1 endpoint

• space-weather.use.x402atlas.com Live x402

  Current space-weather conditions — normalized NOAA SWPC Kp, solar wind, magnetic field, and X-ray flux used for solar-flare monitoring, with observation times and freshness. (3 paid endpoints on space-weather.use.x402at…

  x402 paid API · 3 endpoints

• space.halowerk.com Live x402

  Computes mean NDVI and an ordinary least-squares daily NDVI trend, then applies yield = intercept + mean_coefficient×mean_NDVI + trend_coefficient×daily_trend. It does not derive NDVI from imagery, account for crop stag…

  x402 paid API · 10 endpoints

• spark.lonestaroracle.xyz Live x402

  Wholesale US electricity-market price + volatility signal (no params)

  x402 paid API · 1 endpoint

• speccy.cloud Live x402

  Top Polymarket prediction markets by 24h volume. Returns up to 50 markets with id, question, slug, volume, volume24hr, liquidity, endDate, outcomes and outcomePrices. (2 paid endpoints on api.speccy.cloud.)

  x402 paid API · 2 endpoints

• speedbot.dev Live x402

  Public sources for agent research: one Brave search plus fetch of up to three public HTTPS pages. Returns structured JSON with page text, metadata, source URLs, fetch timestamps and content hashes for source checking an…

  x402 paid API · 1 endpoint

• spendthebits.com Live x402

  Official $0.01 proof-of-life resource for SpendTheBits x402: returns a JSON heartbeat. Pay it to verify your agent's x402 client end to end. (7 paid endpoints on x402.spendthebits.com.)

  x402 paid API · 7 endpoints

• spotify.jojapi.net Live x402

  Spotify — GET /v2/album/detailsAndTracks (v2/Album details & tracks)

  x402 paid API · 1 endpoint

• squeeze.lonestaroracle.xyz Live x402

  Short-squeeze setup signal for a stock (?ticker=<stock ticker>)

  x402 paid API · 1 endpoint

• squeezeos-api.onrender.com Live x402

  Currency conversion API for AI agents — convert an amount between currencies using official ECB reference-rate data; one-shot x402 call with optional volume credits. (20 paid endpoints on squeezeos-api.onrender.com.)

  x402 paid API · 12 endpoints

• srv1334799.hstgr.cloud Live x402

  Cheapest agent-ready x402 demand read: what changed, why it matters, recommended action, confidence, evidence, coverage, and freshness. (2 paid endpoints on srv1334799.hstgr.cloud.)

  x402 paid API · 2 endpoints

• srv1553682.hstgr.cloud Live x402

  Crypto Fear & Greed index (current + 7-day history) via the verified-quality meta-router: in-house first, outcome-logged, never charged on failure. (3 paid endpoints on srv1553682.hstgr.cloud.)

  x402 paid API · 3 endpoints

• ssl.use.x402atlas.com Live x402

  SSL/TLS certificate check: expiry, issuer, SANs, chain validity, hostname match, negotiated protocol/cipher, and weak-algo warnings for a public HTTPS host. Clean JSON.

  x402 paid API · 1 endpoint

• stable-deepline.dev Live x402

  Enrich Company — merged 30+ field profile from Apollo, Crustdata, and PeopleDataLabs: revenue, headcount, industry, funding, valuation, tech stack, social profiles, SIC/NAICS codes, HQ address. (2 paid endpoints on stab…

  x402 paid API · 2 endpoints

• stable-domains-git-ben-upgrade-agentcash-r-bb6a65-merit-systems.vercel.app Live x402

  Check domain availability and current registration price.

  x402 paid API · 1 endpoint

• stable-enrich-git-mason-migrate-off-prices-map-merit-systems.vercel.app Live x402

  Exa Search - Neural search across the web

  x402 paid API · 1 endpoint

• stable-media-git-ben-upgrade-agentcash-rou-02e093-merit-systems.vercel.app Live x402

  List every supported country with its streaming services

  x402 paid API · 1 endpoint

• stable-travel-git-migrate-stabletravel-router-140-merit-systems.vercel.app Live x402

  Get weather observations (METAR) for a specific airport (3 paid endpoints on stable-travel-git-migrate-stabletravel-router-140-merit-systems.vercel.app.)

  x402 paid API · 3 endpoints

• stableapify.dev Live x402

  Start the "💡 Indeed Jobs Scraper" Apify actor (valig/indeed-jobs-scraper). $0.1/1K jobs | Scrape job listings, salaries, and company details from Indeed with customizable search filters and structured output. (7 paid e…

  x402 paid API · 7 endpoints

• stablecrypto.dev Live x402

  List all chains with TVL (2 paid endpoints on stablecrypto.dev.)

  x402 paid API · 2 endpoints

• stablefinance.dev Live x402

  Real-time single-ticker price quote. Invalid or unsupported tickers return upstream 400/404; check /api/company/facts/tickers or endpoint-specific /tickers lists before batching. (12 paid endpoints on stablefinance.dev.)

  x402 paid API · 12 endpoints

• stableflare.dev Live x402

  Capture a screenshot of any URL or HTML. Returns a PNG or JPEG image. Supports full-page, element selection, custom viewport. (4 paid endpoints on stableflare.dev.)

  x402 paid API · 4 endpoints

• stablejobs.dev Live x402

  Preview jobs by filters (step 1). Call before job-collect. Page 1–5, 20/page, $0.10/page. Returns id, title, location, company_name, created, _score; pagination; next.collect when results exist. No description, salary,…

  x402 paid API · 1 endpoint

• stable.lonestaroracle.xyz Live x402

  Top stables ranked by mcap with peg deviation (now/24h/7d) + stability score + risk

  x402 paid API · 1 endpoint

• stableninja.dev Live x402

  Fetch Google Play Store top grossing games. (5 paid endpoints on stableninja.dev.)

  x402 paid API · 5 endpoints

• stablepeopledata.dev Live x402

  PDL Company Enrich - Enrich a company record with firmographics, industry codes, funding, and social profiles. Supports lookup by name, website, ticker, LinkedIn, or PDL ID. (2 paid endpoints on stablepeopledata.dev.)

  x402 paid API · 2 endpoints

• stableproduct.dev Live x402

  List Wirecutter review URLs from the public Wirecutter review sitemaps. Defaults to recommendation-like review pages. (5 paid endpoints on stableproduct.dev.)

  x402 paid API · 5 endpoints

• stablesocial.dev Live x402

  Scrape Creators · Google — Company Ads (48 paid endpoints on stablesocial.dev.)

  x402 paid API · 12 endpoints

• stabletickets.dev Live x402

  Search Ticketmaster events by keyword, date, location, venue, attraction, or classification

  x402 paid API · 1 endpoint

• stabletube.dev Live x402

  Create a paid StableTube download job. StableTube downloads the video server-side, uploads the mp4 to S3, and returns a temporary StableTube-owned download URL when ready.

  x402 paid API · 1 endpoint

• stack.netzhandwerker.de Live x402

  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…

  x402 paid API · 3 endpoints

• stacktr.ee Live x402

  Stacktree: host generated HTML as a live, shareable web page on a permanent, private, unguessable link ($0.50). POST any HTML (a report, dashboard, landing page, static site, or any webpage an agent produced) with payme…

  x402 paid API · 2 endpoints

• stat.halowerk.com Live x402

  Reports the credit-to-GDP gap for a country, which is the deviation of the credit ratio from its long-run trend and the quantity the Basel framework uses to trigger the countercyclical capital buffer. The thresholds app…

  x402 paid API · 4 endpoints

• stelardigital.com Live x402

  Sentiment score (-1 bearish to +1 bullish) and label for arbitrary text, or for a crypto asset based on its recent price action, via Claude Haiku. For agents gauging market mood or scoring news, social posts, or free te…

  x402 paid API · 4 endpoints

Related capabilities

On-chain dataTrading & marketsAI models & inferenceMaps & travelResearchAgent infrastructureSecurity & trustCrypto market data

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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