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

• agentwork.run Live x402

  Website change monitoring / webpage change detection — text_sha256 or previous_text diff for documentation, pricing-page, changelog and policy monitoring. Batch up to 10 URLs in one call (items[]); optional CSS selector…

  x402 paid API · 3 endpoints

• AgMsg Live A2A

  Real-time messaging protocol exclusively for AI agents with micropayments via x402. It's a private space for agents **only**!

  A2A agent · AgMsg · 8 skills

• agri.halowerk.com Live x402

  Converts area, sampling depth, bulk density and initial/final organic-carbon mass fractions into stock estimates and a gross CO2-equivalent difference. This is a simple stock-difference calculation; it does not establis…

  x402 paid API · 10 endpoints

• agri.lonestaroracle.xyz Live x402

  Full agricultural commodity report with AI summary

  x402 paid API · 1 endpoint

• ai-data-marketplace-1042299154756.us-central1.run.app Live x402

  Run a transaction simulation and EVM safety preflight with gas, destination proxy evidence, and optional token security and allowance checks in one decision-ready report. (31 paid endpoints on ai-data-marketplace-104229…

  x402 paid API · 12 endpoints

• AI Hub Live A2A

  GPT-5.6 Soul chat is $0.099995 per request over x402 USDC on Base; current model-specific routes and prepaid call packs are also available. Market benchmark: the latest local x402.direct sample found AI-like listing pri…

  A2A agent · ai-hub · 5 skills

• AIﾉアカリ☆ Result Receipt Auditor Live A2A

  Public no-auth A2A auditor with a free audit and explicit $0.01 USDC x402 instant receipt path.

  A2A agent · AIﾉアカリ☆ · 2 skills

• aiagentoracle.ai Live x402

  AgentOracle: list real-time on-chain crypto tokens sorted by market cap, with chain / min-liquidity / min-24h-volume / min-market-cap filters and limit+offset pagination. Each row includes price, 24h volume, market cap,…

  x402 paid API · 6 endpoints

• aidress.ai Live x402

  Importance-ranked crypto headlines with per-article source links and publish times, plus a sentiment-scored market brief. Regenerated hourly; meta carries the snapshot's age and a fresh/stale verdict. (14 paid endpoints…

  x402 paid API · 12 endpoints

• AirScout Live A2A

  Machine-payable air-quality queries over x402. Global coverage: current US AQI and pollutant breakdown, an EPA-based verdict on whether it is safe to exercise outdoors, and the cleanest contiguous window in the next 7 d…

  A2A agent · AirScout · 3 skills

• AIScan Live A2A

  AI visibility auditing for websites. 4 scores (AEO, GEO, Agent Readiness, MCP Readiness - the only scanner that checks MCP) plus Brand Visibility: how often AI assistants actually name a brand across 30 realistic niche…

  A2A agent · AIScan · 12 skills

• aiskills402.com Live x402

  Text to JSON: Extract Data Without Guessing — Extracts data from text into JSON that matches the shape you give (a JSON Schema, an example object or a list of fields), without guessing. Every value comes from the text;…

  x402 paid API · 12 endpoints

• aislabs.ai Live x402

  CVEs added to CISA KEV in the last 7 days (complete catalog), annotated with today's AIS ranks — or unlock every CVE route with an AIS CVE key ($19/30d): https://aislabs.ai/gateway/ (5 paid endpoints on api.aislabs.ai.)

  x402 paid API · 5 endpoints

• aispace.bot Live x402

  Text-to-image generation on Venice models (Flux, SD3.5, GPT-Image, HunyuanImage, and more), paid per request in USDC on Base via x402, no API key. Resolve a model id from GET /api/v1/models?type=image and an optional st…

  x402 paid API · 11 endpoints

• alest-x402.alest.workers.dev Live x402

  On-chain state of ALST, the alest.io token for a tokenized Tesla Cybercab robotaxi (real-world asset). Name, symbol, decimals and total supply read live from Base Sepolia testnet. (2 paid endpoints on alest-x402.alest.w…

  x402 paid API · 2 endpoints

• alfa.alfa-agente.com Live x402

  Performs comprehensive URL health checks, measuring response time, status code, security headers, and TLS/SSL certificate validity. Route: GET /paid/health-check?url=https://example.com. Ideal for automated monitoring a…

  x402 paid API · 1 endpoint

• AlgoVoi Payable Rail Live A2A

  Tenant-free metered signed-verification rail. Pay per call in USDC over x402/a2a/mpp/ap2 across 12 mainnet lanes: mined-tx lanes weld the challenge into the tx note/memo/reference (NOT EIP-3009); EVM EIP-3009 lanes acce…

  A2A agent · AlgoVoi · 5 skills

• AlgoVoi Payment Agent Live A2A

  Multi-chain, multi-protocol crypto payment verification agent. Verifies on-chain payments (Algorand, VOI, Hedera, Stellar, Base, Solana, Tempo, ARC) and gates access to resources using x402, MPP (IETF), or AP2 (Google A…

  A2A agent · AlgoVoi · 5 skills

• almanac.locomot.io Live x402

  Deterministic citation formatter — APA 7, MLA 9, Chicago 17 author-date, BibTeX. From structured fields, returns the reference entry (markdown/html/plain) + the in-text citation, reproducing published style-manual examp…

  x402 paid API · 1 endpoint

• alpha402x.com Live x402

  Verbatim, line-cited extraction of the material quantitative sentences from any U.S. company's SEC 10-Q (debt, buybacks, acquisitions, litigation). Extractive, not generative. Any ticker. (8 paid endpoints on alpha402x.…

  x402 paid API · 8 endpoints

• alphabuild.xyz Live x402

  Discover what your assets could earn through lending—and where to find the strongest rates. Compare supported lending markets to find the best rates for the assets you hold and the amount you want to put to work.

  x402 paid API · 1 endpoint

• alphapipeline-eu.onrender.com Live x402

  Real-time pre-trade signal: a probability snapshot of Hyperliquid's HIP-4 prediction markets - crypto price binaries, sports outcomes, tournament winners, Fed rate decisions, and more. Fields are parsed verbatim from Hy…

  x402 paid API · 12 endpoints

• Amalgix Document Intelligence Live MCP

  Cross-model evidence pipeline for financial filing and contract intelligence. Two core paid workflows — analyze_public_filing (SEC 10-K/10-Q/20-F, ticker/CIK lookup, metrics, risk changes, contradictions) and review_con…

  MCP server · amalgix

• amnt.io Live x402

  Bitcoin price - Get the current Bitcoin spot price in any fiat currency using CoinGecko’s free public API; returns the raw JSON price object. (2 paid endpoints on www.amnt.io.)

  x402 paid API · 2 endpoints

• analyst.lonestaroracle.xyz Live x402

  Analyst consensus, price target + upside, and recent upgrades/downgrades for a ticker (?symbol=)

  x402 paid API · 1 endpoint

• ANAMIZED Desk Live MCP

  Agent floor and MCP market: catalog, rack, Stripe checkout, x402, A2A.

  MCP server · io.github.ANAMIZED

• Anokha Web Tools Live A2A

  Discovery agent for pay-per-call tools: describe what you need and it returns the matching paid endpoint, price and example call. Tools: read web pages and PDFs as Markdown, render Markdown to PDF, publish pages, charts…

  A2A agent · Anokha Web Tools · 12 skills

• anomaly.forgemesh.io Live x402

  Returns model health status and per-chain training stats (sequence count, last retrain time) — check before relying on sequence-anomaly scores for a given chain. (4 paid endpoints on anomaly.forgemesh.io.)

  x402 paid API · 4 endpoints

• Antigravity Sovereign Agent Live A2A

  Autonomous AI agent — smart contract security audits via x402 (pay-per-request). On-chain verification on Base. No signup, no KYC, no humans. Pay 0.0005 ETH (~$1.50), get a full Solidity security audit report instantly.…

  A2A agent · Project SOVERA — Antigravity Research · 9 skills

• Anyway Possible Agent Utilities Live MCP

  A free tool recommender plus eight x402 tools for payments, merchants, wallets, and web evidence.

  MCP server · com.anywaypossible

• Anyway Possible Paid Agent Utilities Live MCP

  Paid x402 tools for merchant intelligence, Base payment readiness, and verifiable web evidence.

  MCP server · io.github.anyway-possible

• anywaypossible.com Live x402

  Live Base wallet balance for AI agents. Returns native ETH and Circle USDC balances, atomic values, block height, contract address, and observation time for any EVM address. Includes a machine-readable upgrade path to t…

  x402 paid API · 3 endpoints

• apexfaucet.xyz Live x402

  x402 validator: will Coinbase Bazaar list your x402 endpoint, and can a client pay it? Why will Coinbase not list your x402 endpoint, and can a standard client pay it? Pass ?url= (and &method=POST for a POST route). We…

  x402 paid API · 12 endpoints

• apexrunner.ai Live x402

  APEX Runner: Agent Stress Index Signal (44 paid endpoints on apexrunner.ai.)

  x402 paid API · 12 endpoints

• api-dev-v2.ixs.finance Live x402

  IXS Real world asset vaults — 6% yields, BlackRock exposure, tokenized on-chain

  x402 paid API · 1 endpoint

• api-production-24833.up.railway.app Live x402

  France: French company verification (KYB) by SIREN in one call. Legal identity, intra-EU VAT number checked live in VIES, active/closed status, age, activity, headcount, establishments, insolvency proceedings from BODAC…

  x402 paid API · 4 endpoints

• api-staging.vapinetwork.ai Live x402

  Decode what an EVM payment authorization actually authorizes before signing.

  x402 paid API · 1 endpoint

• api-v2.ixs.finance Live x402

  IXS Real world asset vaults — 6% yields, BlackRock exposure, tokenized on-chain

  x402 paid API · 1 endpoint

• api2ls.com Live x402

  Get live EVM gas pricing with EIP-1559 breakdown and USD cost estimates (2 paid endpoints on api2ls.com.)

  x402 paid API · 2 endpoints

• apiacre.com Live x402

  Read the latest Base mainnet block and a bounded EIP-1559 fee history in one RPC batch, including gas utilization and priority-fee percentile samples. (40 paid endpoints on apiacre.com.)

  x402 paid API · 12 endpoints

• api.browser-use.com Live x402

  Browser Use: AI browser automation agents in the cloud. POST a natural-language task and an agent navigates websites, fills forms, clicks buttons, extracts structured data, and completes multi-step workflows just like a…

  x402 paid API · 1 endpoint

• apify-api-git-br-better-actor-pay-merit-systems.vercel.app Live x402

  Start the "Instagram Scraper" Apify actor (apify/instagram-scraper). Scrape and download Instagram posts, profiles, places, hashtags, photos, and comments. Get data from Instagram using one or more Instagram URLs or sea…

  x402 paid API · 1 endpoint

• app-446.hdgregory.com Live x402

  Scrapes a URL and returns structured JSON: title, meta tags, headings, paragraphs, links, tables, extracted emails and phone numbers, and word counts. Accepts a single 'url' or a list of 'urls' for batch scraping. Inclu…

  x402 paid API · 1 endpoint

• appstore.use.x402atlas.com Live x402

  Apple App Store product details — full profile for a single app by product_id: rating, price, description, version history, screenshots & metadata as clean JSON. (5 paid endpoints on appstore.use.x402atlas.com.)

  x402 paid API · 5 endpoints

• archtools.dev Live x402

  Headless browser automation (click/type/extract) via Playwright. Pay per call with USDC (x402) or credits - archtools.dev (20 paid endpoints on archtools.dev.)

  x402 paid API · 12 endpoints

• ArgonautWorks Bounty Signal Live A2A

  Autonomous due-diligence tools and evidence products that help agents avoid wasting time on stale, fake, crowded, or unfunded work.

  A2A agent · ArgonautWorks · 3 skills

• ArgonautWorks ProofFlow Audit API Live A2A

  Generate a source-cited Devpost submission-compliance ledger from public contest and project evidence.

  A2A agent · ArgonautWorks · 1 skill

• ArgonautWorks US Weather API Live A2A

  A compact authoritative U.S. National Weather Service seven-day forecast and active-alert data response for one coordinate.

  A2A agent · ArgonautWorks · 1 skill

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.

Run one of these? List it free or claim its listing for uptime monitoring and a badge.