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

• Wizeb AI-Native Index Live MCP

  AI-Native Index scoring, PDF report, Wizeb Q&A, and an Enhanced report agents buy over x402.

  MCP server · com.wizeb

• workbot1.oddsys.org Live x402

  Live foreign-exchange reference rates (European Central Bank daily fixes, ~30 major currencies): any cross-rate from any base, optional amount conversion. Refreshed daily; response carries the rate date. (13 paid endpoi…

  x402 paid API · 12 endpoints

• x-402.online Live x402

  Get price per square metre and recent sales around a French address. Lite property analysis for a French address: median price per square metre in the area, estimated value and an investment score. Enough to screen a sh…

  x402 paid API · 12 endpoints

• x402-adsb.x402-adsb-worker.workers.dev Live x402

  Live aircraft positions over Kansai / western Japan from an independent ADS-B receiver (~1s freshness): position, altitude, speed, squawk, plus callsign→route resolution (origin/destination airports) from official timet…

  x402 paid API · 1 endpoint

• X402 AI 自助门店 Live A2A

  AI 对 AI 自助服务门店：别的 AI 可出示 ERC-8004 身份卡、与店员谈判、通过 x402 链上自动付款并即时获得服务交付。客户是 AI 程序，不是人类。

  A2A agent · X402 AI 自助门店 · 7 skills

• x402-api.aubr.ai Live x402

  Send a question about longevity, aging, or lifespan science. Returns a request ID to poll for the AI-generated answer from Aubrai, VitaDAO's decentralized co-scientist. (5 paid endpoints on x402-api.aubr.ai.)

  x402 paid API · 5 endpoints

• x402 Bazaar Listing Monitor Live MCP

  Checks x402 Bazaar resource listings against the public discovery catalog and flags drops.

  MCP server · com.acjlabs

• x402-data-api.onrender.com Live x402

  IP geolocation: country, region, city, coordinates, and timezone for any IPv4 or IPv6 address. Fast in-memory lookup for analytics, fraud, and personalization agents. (2 paid endpoints on x402-data-api.onrender.com.)

  x402 paid API · 2 endpoints

• x402-datashop-production.up.railway.app Live x402

  Latest European Central Bank reference exchange rates, normalized JSON. Query: ?base=EUR&symbols=USD,GBP,JPY (symbols optional -> all). Rates update once per working day; served with a 1h cache. (7 paid endpoints on x40…

  x402 paid API · 7 endpoints

• x402-dataviz-poc.theliminalguy.workers.dev Live x402

  Render a bar/line/area chart to SVG (v2 discovery probe)

  x402 paid API · 1 endpoint

• x402 Doctor Live MCP

  Diagnose x402 seller endpoints: what is wrong with your 402 challenge, and how to fix it.

  MCP server · com.twelvepermissions

• x402-doctor.fizzl.eu Live x402

  Is this x402 endpoint safe to pay? Call it before your AI agent pays an endpoint it has not used before. Returns a go / caution / no_go verdict, the recommended payment option (network and amount) and the reasons (payme…

  x402 paid API · 5 endpoints

• x402-factory.com Live x402

  Cheapest endpoint: liveness plus x402 payment pipeline check — Returns ok with the server time and whether this call was paid. Use it to verify your x402 client end to end before spending on data endpoints. (189 paid en…

  x402 paid API · 12 endpoints

• x402-filings.datalayer.workers.dev Live x402

  Job postings read straight from a company's own applicant tracking system — Greenhouse, Lever, Ashby, SmartRecruiters, BambooHR or Recruitee. This is the source that job boards scrape, so there are no duplicates, no exp…

  x402 paid API · 6 endpoints

• x402 Format Checker Live MCP

  IBAN, EU VAT, NIP, REGON, PESEL, email checks. Only $0.001 (0.1 cent) per check via x402 on Base

  MCP server · com.crewofthecaptain

• x402 Format Checker (Crew of the Captain) Live A2A

  Format and checksum validation for IBAN, EU VAT, Polish NIP/REGON/PESEL and email, pay-per-call via x402. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Send message/send with a data part {"type": "<sk…

  A2A agent · Crew of the Captain · 6 skills

• x402-fuelprice-poc.theliminalguy.workers.dev Live x402

  Current UK weekly average road fuel price (petrol + diesel, pence/litre), sourced live from DESNZ (UK gov)

  x402 paid API · 1 endpoint

• x402-gateway-production.up.railway.app Live x402

  x402engine — Run code in isolated sandbox — Python, JavaScript, Bash, R (up to 5 min) (4 paid endpoints on x402-gateway-production.up.railway.app.)

  x402 paid API · 4 endpoints

• X402 Git Live MCP

  Buy private git repos and agent skills with USDC over x402. Read the manifest free, then pay.

  MCP server · com.x402git

• x402 Market Intelligence + Russian Web Access Live MCP

  Check x402 endpoints before paying: liveness, price history, farm detection. Plus RU web access.

  MCP server · com.ruscrape

• x402-pulse-seller-production.up.railway.app Live x402

  Live BTC/ETH/SOL prices + the Crypto Fear & Greed Index in one call. Sourced from CoinGecko and alternative.me public data, combined for convenience.

  x402 paid API · 1 endpoint

• x402-retire-git-feat-paid-indexing-gate-and-openapi-carbonmark.vercel.app Live x402

  Live snapshot of the most liquid carbon credits retirable on Base: the top 3 Klima Protocol carbon classes and the top 3 Carbonmark marketplace listings, with USDC-per-tonne prices and tonnes available. Additionally, th…

  x402 paid API · 1 endpoint

• x402-seller-a5et.onrender.com Live x402

  Call when you want the current Musebook money-challenge leaderboard, trending lobby posts, and newest Playbook skills in one payload. $0.01 USDC (2 paid endpoints on x402-seller-a5et.onrender.com.)

  x402 paid API · 2 endpoints

• x402-seller.onrender.com Live x402

  Latest Henry Hub natural gas spot price (USD/MMBtu), sourced from the U.S. Energy Information Administration. Data lags several business days behind the market; not live trading data. (16 paid endpoints on x402-seller.o…

  x402 paid API · 12 endpoints

• x402-tollbooth.onrender.com Live x402

  Check whether email addresses are real and safe to send to. Verifies up to 25 addresses per call: syntax, domain MX/A record (including null-MX), disposable-domain, role-account, free-provider and typo checks. Does not…

  x402 paid API · 2 endpoints

• x402-tools.vercel.app Live x402

  Search for upcoming concerts. Supports city, date range, genre, and artist filtering. (2 paid endpoints on x402-tools.vercel.app.)

  x402 paid API · 2 endpoints

• x402-trends-server.onrender.com Live x402

  Scrape a public webpage and extract clean readable text. Use this web scraping endpoint when an AI agent needs page content for summarization, research, retrieval, content extraction, indexing, or downstream analysis wi…

  x402 paid API · 4 endpoints

• x402-url-extractor-production.up.railway.app Live x402

  Extract a public HTTP(S) page into JSON: title, description, JSON-LD, Open Graph, headings, links, and AI-readiness signals. No JavaScript; 12-second timeout; 3 MB cap. Paid JSON keeps requestedUrl, finalUrl, status, so…

  x402 paid API · 1 endpoint

• x402 Web Extract Live MCP

  Pay-per-use web extract, token prices, and wallet balances via x402 USDC micropayments.

  MCP server · io.github.Senpi-Station

• x402agentic.ai Live x402

  Per-agent budget enforcement — track an agent's cumulative spend against a cap and block overspend. Part of x402 Agentic, the payment-trust suite for AI agents on Base USDC.

  x402 paid API · 1 endpoint

• x402check.xyz Live x402

  Check a counterparty before paying: OFAC SDN, phishing and drainer feeds, a live watch of drainer infrastructure, transaction simulation and injected-instruction analysis. Returns a score and a signed ES256 attestation.…

  x402 paid API · 2 endpoints

• x402financialdata.com Live x402

  Real crypto market data in one batched call: price, market cap, market-cap rank, 24h volume/high/low/change, circulating/total/max supply, and all-time-high with date -- for BTC, ETH, SOL, and 17+ other major coins by t…

  x402 paid API · 12 endpoints

• x402joker.com Live x402

  Pay-per-joke vending machine: send USDC, get a fresh Claude-generated joke. Optional "theme" picks the topic.

  x402 paid API · 1 endpoint

• x402lifeadvice.vercel.app Live x402

  Get one piece of thoughtful life advice, paid per request over x402.

  x402 paid API · 1 endpoint

• x402stock.pay.zeroclick.io Live x402

  Get the latest available price for any US-listed stock: the most recent 1-minute bar close plus today's OHLCV, change, and previous close. Currently 15 minutes delayed; each response carries `is_delayed: true`. Real-tim…

  x402 paid API · 3 endpoints

• x402stock.vercel.app Live x402

  Reference list of US equity exchanges and market centers with names, MICs, operating MICs, and SIP participant IDs. From x402stock, a pay-per-call market & economic data API for AI agents. No API key or account; pay in…

  x402 paid API · 5 endpoints

• x402stock.xyz Live x402

  The daily US Treasury par yield curve (Constant Maturity Treasury rates) for every maturity from 1 month to 30 years, in percent. Defaults to the latest published day; pass `?limit=` for more recent days (max 250) and `…

  x402 paid API · 12 endpoints

• x402swag.com Live x402

  x402swag.com — merch store for AI agents and builders. T-shirts, stickers, mugs and custom print-on-demand designs. Full catalog with prices, variants and the exact buy flow in one call.

  x402 paid API · 1 endpoint

• x402uselessfacts.vercel.app Live x402

  Pay a tiny amount of USDC and receive one delightfully useless fact.

  x402 paid API · 1 endpoint

• x402wordoftheday.vercel.app Live x402

  Get today's curated Word of the Day (definition + part of speech).

  x402 paid API · 1 endpoint

• x711 — Universal Agent Gas Station Live MCP

  Pay-per-use tool API for AI agents. Free tier, x402 USDC micropayments, or API key.

  MCP server · io.github.0580iris-lang

• xDEO — Earnings Oracle Live MCP

  Reputation-ranked analyst earnings estimates. Pay per call via x402 on Base.

  MCP server · io.github.Timwal78

• xfuel.app Live x402

  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…

  x402 paid API · 1 endpoint

• xynaptic.io Live x402

  Xynaptic Asia News v2 — structured events across Asia (China, Japan, India, Korea, ASEAN, last 3h): importance, lifecycle, entities, sectors, multi-source verification, agent-ready actions. Refreshed every 2 hours. (148…

  x402 paid API · 12 endpoints

• yieldprobe: DeFi intel for agents Live MCP

  Paid DeFi data for agents via x402 on Base: yields, APY moves, stablecoin pegs, token risk.

  MCP server · com.yieldprobe

• yield.trdefi.com Live x402

  TRDEFI prepare request (2 paid endpoints on yield.trdefi.com.)

  x402 paid API · 2 endpoints

• YouTube Video Summarizer (pay-per-call) Live MCP

  Summarize YouTube videos or fetch transcripts. Pay-per-call via x402 (USDC on Base), no account.

  MCP server · io.github.JonTelep

• Zambo (zambo.dev) Live A2A

  Zambo is the Trust Layer for AI work. Every job returns a verifiable receipt: a SHA-256-committed record of exactly what was executed, checkable by anyone at https://zambo.dev/verify. Zambo implements AER-1, the open dr…

  A2A agent · zambo.dev · 2 skills

Related capabilities

On-chain dataTrading & marketsAI models & inferenceAgent infrastructureResearchMaps & travelSecurity & 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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