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

Pay-per-call HTTP APIs that accept x402 payments (USDC), callable by agents with no account or API key. 1222 listings in the Rooms directory, 1212 answering our latest daily check. Each one links to its endpoint, how to call it and its live status.

computeindex.lonestaroracle.xyz Live x402
Energy cost per GPU-hour by US power region + regional basis (no params)
x402 paid API · 1 endpoint
compute.lonestaroracle.xyz Live x402
GPU compute spot prices — best deals across Vast.ai, RunPod, AWS, Lambda + market signal + AI brief
x402 paid API · 1 endpoint
Comrades of War Archive Research Agent Live A2A
Searches a privacy-curated archive of nearly five years of Spanish Call of Duty clan, gaming-community, and SA-MP role-play history. Returns free previews and exact x402 purchase URLs for citation-ready individual forum…
A2A agent · Comrades of War Archive · 1 skill
conch402.dylan-caponi.workers.dev Live x402
Perform the chant: 'All hail the Magic Conch!' The club responds: 'Hooray for the magic conches!' That is all this does, and it is enough.
x402 paid API · 1 endpoint
concordancehq.duckdns.org Live x402
Full-text search across every aggregated data source in one call: news, SEC filings, court opinions, academic papers, government records, and developer discussions. One query surfaces everything concordant across indepe…
x402 paid API · 4 endpoints
consumer.lonestaroracle.xyz Live x402
US consumer-demand signal (retail sales)
x402 paid API · 1 endpoint
content.hugen.tokyo Live x402
Extract and classify all hyperlinks from a web page — internal vs external using eTLD+1 domain matching. Returns up to 200 internal and 200 external links with counts. No web crawler setup needed. Accepts USDC payments…
x402 paid API · 5 endpoints
context-relay.contextrelay.workers.dev Live x402
URL-to-Markdown web extraction and context compression for AI agents. Fetch a public web page and return clean, task-relevant, citation-verifiable LLM context with exact excerpts, locators, hashes, and estimated tokens…
x402 paid API · 1 endpoint
contextiq.trango-compute.com Live x402
Token Inspector model pricing (per call) (8 paid endpoints on contextiq.trango-compute.com.)
x402 paid API · 8 endpoints
contextslim.friczero.com Live x402
[MCP: fetch_result] Targeted JSONPath extraction (query param mode) from cached context reference. (2 paid endpoints on contextslim.friczero.com.)
x402 paid API · 2 endpoints
convert.guru Live x402
Detects the likely real file format from filename, file creation time, file size, and the first 200 bytes of the file. Identifies common formats such as PDF, DOCX, XLSX, CSV, JPG/JPEG, PNG, WEBP, HEIC, TXT, HTML, MP3, W…
x402 paid API · 2 endpoints
convrgent.ai Live x402
Create a new persistent human profile in the vault. Agent-namespaced by wallet address. Accepts initial identity, text samples, observations, and birth data. (2 paid endpoints on convrgent.ai.)
x402 paid API · 2 endpoints
coord.taifoon.dev Live x402
OHLCV bars of BTC, ETH, SOL or the CME micro futures NQ, ES, YM (15s, 1m, 5m, 1h) from the Taifoon venue tape, past windows only (up to 1,000 bars a call), with a sha256 digest of the bars. The tape seals a past window,…
x402 paid API · 7 endpoints
cors-header-checker.underscoredone.com Live x402
Sends a real request to any URL you provide, attaches an Origin header, and reads back all six standard cross-origin permission headers the server returns. Tells you whether cross-origin requests are enabled at all, whe…
x402 paid API · 1 endpoint
cot.lonestaroracle.xyz Live x402
CFTC Commitments of Traders positioning for a market (?market=<name>)
x402 paid API · 1 endpoint
Council of AI GSPC Live MCP
19 tools (14 free, 5 x402-metered): GSPC board, evidence, Ed25519 card verify. Measurement only.
MCP server · ai.councilof
Council of AI — Measurement Agent Live A2A
Independent AI-governance MEASUREMENT body. Publishes the living GSPC board (Governance · Safety · Provenance · Continuity) — quote totals.lid and totals.public_count from GET /api/gspc, never a typed integer here — wit…
A2A agent · CSOAI Ltd · 12 skills
cpi-report-us.underscoredone.com Live x402
Gives you official United States inflation numbers from the government's BLS Consumer Price Index. Ask for the newest reading, a specific month in the past, or a whole range of months, and get back clear percentages for…
x402 paid API · 1 endpoint
craigmbrown.com Live x402
Fast real-time news scan across 44+ curated domains (configs/search_domain_profiles.json), every item source-attributed. Settlement proof: ProofOfSettledOutcome (kind 30120, data/proof_settled_outcomes.jsonl). The quick…
x402 paid API · 12 endpoints
crawlspur.halowerk.com Live x402
Prüft am Objekt parameter-url den Befund Wert des X-Robots-Tags. (100 paid endpoints on crawlspur.halowerk.com.)
x402 paid API · 12 endpoints
creative-tim.com Live x402
View component code after payment (2 paid endpoints on x402.creative-tim.com.)
x402 paid API · 2 endpoints
creativeforesight.io Live x402
Foresight API request (9 paid endpoints on api.creativeforesight.io.)
x402 paid API · 9 endpoints
creator.halowerk.com Live x402
Sorts caller-supplied placement opportunities by end time and solves the weighted non-overlapping interval problem exactly with dynamic programming. It does not buy inventory, predict conversion, enforce platform policy…
x402 paid API · 10 endpoints
CrossingKey MCP Live MCP
Agent-native MCP for governed commerce, x402 payments, paid capabilities, and verifiable receipts.
MCP server · com.crossingkeyintelligence
crypto-sentiment-x402.onrender.com Live x402
Real-time crypto sentiment for a ticker symbol (e.g. BTC, ETH, SOL) from 9 crypto news RSS outlets (CoinDesk, Cointelegraph, Decrypt, Bitcoin Magazine, The Block, CryptoSlate, NewsBTC, CryptoPotato, The Defiant) and the…
x402 paid API · 2 endpoints
cryptodataapi.com Live x402
Issuer-aggregated daily spot ETF net flows for btc, eth or sol. (7 paid endpoints on cryptodataapi.com.)
x402 paid API · 7 endpoints
cryptoetfsentinel.com Live x402
Crypto ETF Sentinel — Side-by-side comparison of ALL trading US spot crypto ETFs: POS AM profile, XBRL financials, market data and Fund Health metrics (premium/discount, tracking, implied NAV) per fund. Use when choosin…
x402 paid API · 12 endpoints
crypto.forgemesh.io Live x402
Returns current market risk state, per-symbol signal streaks, and active cooldown timers — use it as a pre-trade risk gate before acting on any signal. Typical agent tasks: check if BTC or ETH is in cooldown before a tr…
x402 paid API · 12 endpoints
crypto.openverbs.com Live x402
Total value locked (USD) for one DeFi protocol by DefiLlama slug or name (e.g. "aave-v3", "lido", "uniswap-v3"): current TVL, per-chain TVL breakdown, 1h/1d/7d TVL change, category, chains, token symbol and market cap.…
x402 paid API · 12 endpoints
CryptoPulse Data API Live MCP
Pay-per-call crypto market intelligence for AI agents. USDC on Base via x402.
MCP server · ai.saascloud
cryptoshark.duckdns.org Live x402
Current USD market snapshot for a supported cryptocurrency symbol or CoinGecko asset name
x402 paid API · 1 endpoint
cueframe.ai Live x402
Validate a composition body without saving it (dry-run) (3 paid endpoints on api.cueframe.ai.)
x402 paid API · 3 endpoints
curl-http-request.underscoredone.com Live x402
Send an HTTP request to any URL from our servers and receive the full response — including the status code, all response headers, and the body content. Supports GET, POST, PUT, PATCH, DELETE, and HEAD. Automatically fol…
x402 paid API · 1 endpoint
currency-api-production-4a8d.up.railway.app Live x402
Current price, market cap, and 24h change for a single cryptocurrency by symbol or name (CoinGecko). (3 paid endpoints on currency-api-production-4a8d.up.railway.app.)
x402 paid API · 3 endpoints
cycle.lonestaroracle.xyz Live x402
US inventory & production cycle signal (bullwhip gauge)
x402 paid API · 1 endpoint
dailyelo.com Live x402
Live reliability feed of x402 endpoints on Base: which services are up, return a valid 402 envelope, and how fast — free-probed across the CDP Bazaar catalog. A real share of listed endpoints are broken/misconfigured; p…
x402 paid API · 9 endpoints
darrylbots.com Live x402
Darrylbots paid research: Standard Stock Screen: Quality, Momentum, and Durable Execution (3 paid endpoints on darrylbots.com.)
x402 paid API · 3 endpoints
data.finery.cc Live x402
Search Singapore MOE schools by name or postal code (optional level filter). Results include the school directory joined with subjects offered, CCAs, MOE programmes and distinctive programmes. (2 paid endpoints on data.…
x402 paid API · 2 endpoints
dataforagents.net Live x402
DataForAgents — Steam catalog search for agents (name, genre, price filters) (2 paid endpoints on dataforagents.net.)
x402 paid API · 2 endpoints
data.greeneris.io Live x402
Hourly weather forecast for any point on Earth from Open-Meteo (blend of ECMWF/GFS/ICON models, refreshed hourly; data CC-BY 4.0). Query: ?latitude=48.8566&longitude=2.3522&hourly=temperature_2m,precipitation,wind_speed…
x402 paid API · 12 endpoints
data.japanagent.dev Live x402
Company name search across jurisdictions. jurisdiction=lei searches the global GLEIF LEI database (all countries); jurisdiction=jp searches the official Japan National Tax Agency corporate registry. Returns registered l…
x402 paid API · 3 endpoints
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
Dayze — Life Context Live MCP
Life context for agents: get_context_pack + public notable packs. x402 + OAuth.
MCP server · com.dayze
DCL Trust Oracle — AI/LLM Output Audit (x402 MCP) Live MCP
AI/LLM agent output audit MCP: policy eval, tamper-evident chain, AI safety, x402 USDC on Base.
MCP server · com.fronesislabs
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

Related capabilities

On-chain data Trading & markets Agent infrastructure Research AI models & inference Maps & travel Web scraping Email

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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