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. 1224 listings in the Rooms directory, 1214 answering our latest daily check. Each one links to its endpoint, how to call it and its live status.

trade.lonestaroracle.xyz Live x402
US trade-flow + tariff signal by commodity
x402 paid API · 1 endpoint
tradesnack.com Live x402
Multi-indicator technical analysis (SMA/EMA crosses, Bollinger, RSI, candlestick patterns, support/resistance, trendlines, experimental Elliott Wave) for any crypto pair.
x402 paid API · 1 endpoint
tradesonar.io Live x402
List markets with price and open interest (11 paid endpoints on api.tradesonar.io.)
x402 paid API · 11 endpoints
trading-perps.vercel.app Live x402
Latest ENSO index bundle from El Niño Market Watch: weekly Niño 1+2/3/3.4/4 SST anomalies (NOAA CPC), RONI, Troup SOI (BOM) and weekly IOD/DMI — recent tails with exact source URLs. (4 paid endpoints on trading-perps.ve…
x402 paid API · 4 endpoints
transit.agentic-jp.com Live x402
Directory of Japanese (JP) rail operators and their lines, with canonical ids and Japanese/English names. Use to discover valid line and operator identifiers for the other endpoints. (3 paid endpoints on transit.agentic…
x402 paid API · 3 endpoints
transitpulse.theaslangroupllc.com Live x402
Rail/coach/ferry/cruise compensation eligibility — UK Delay Repay, EU Rail 2021/782 (25/50%), EU/UK ferry 1177/2010, EU coach 181/2011, US FMC cruise refunds (46 CFR 540, 3-day rule), Athens Convention ship baggage — pl…
x402 paid API · 1 endpoint
travel-agent.forgemesh.io Live x402
Returns active emergency/disruption signals (earthquakes, weather alerts, wildfires, storms, water levels) near a lat/lon, with a status flag and calm relay guidance for travelers. (4 paid endpoints on travel-agent.forg…
x402 paid API · 4 endpoints
travel.forgemesh.io Live x402
Fare Pulse — cheapest live fares from a major US hub, cached snapshot. (2 paid endpoints on travel.forgemesh.io.)
x402 paid API · 2 endpoints
truevaluerankings.com Live x402
Custom-weight rerank of every cryptocurrency covered by True Value Rankings: the full TVR table recomputed with the caller's own weights for the 8 fundamental metrics, using TVR's non-public score transformation. $0.05…
x402 paid API · 2 endpoints
trust.nsgoods.org Live x402
Cross-chain ERC-8004 trust score for one (chain, agent) pair — signed JSON with transparent component breakdown (value_avg / client_breadth / volume / recency), per-chain context, and methodology link. USDC pay-per-call…
x402 paid API · 2 endpoints
trustsource.cc Live x402
Check whether a domain's TLS/SSL certificate is valid, trusted, and not expiring before connecting to it. Performs a live handshake and returns a 0–100 score and tier (VALID/WEAK/EXPIRING/EXPIRED/UNTRUSTED/INVALID) with…
x402 paid API · 2 endpoints
tryskopos.xyz Live x402
Live Polymarket odds and volume — by topic, or today's biggest movers if no topic given. (2 paid endpoints on www.tryskopos.xyz.)
x402 paid API · 2 endpoints
twitr.sh Live x402
Read live X/Twitter data: look up a single tweet or user profile, batch-read up to 100 tweets or users at once, check whether one account follows another, fetch trending topics by region, extract a long-form article, or…
x402 paid API · 4 endpoints
twitter.use.x402atlas.com Live x402
Search Twitter/X with structured filters or raw advanced-search syntax. Returns up to 20 normalized tweets with full text, author details, engagement metrics and a pagination cursor. (21 paid endpoints on twitter.use.x4…
x402 paid API · 12 endpoints
uk-cm-kg.ai Live x402
One paid call on uk-cm-kg.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record of record; allooloo.io: the estate scale block), public-record only, with an…
x402 paid API · 1 endpoint
unicode.openverbs.com Live x402
Reverse lookup: resolve a Unicode character name (e.g. 'SNOWMAN', 'CJK UNIFIED IDEOGRAPH-4E2D', 'HANGUL SYLLABLE GA') to its code point. Loose whitespace/case matching. An unknown name is a successful `found:false`. (4…
x402 paid API · 4 endpoints
unit.openverbs.com Live x402
List the supported units and their metadata (abbreviation, measure, system, singular/plural names), optionally filtered to a single measure — a discovery endpoint for choosing valid `from`/`to` values. (2 paid endpoints…
x402 paid API · 2 endpoints
unwrap.use.x402atlas.com Live x402
Trace an HTTP redirect chain to its final destination without downloading page bodies. Returns every hop (URL + status), the final URL, and safety warnings — link-safety grounding for agents before they visit or cite a…
x402 paid API · 1 endpoint
uptime.cyberwarex.com Live x402
Fleet-wide uptime statistics for every monitored endpoint: uptime percentage, average response time, and total check count over 1, 7 and 30 day windows (plus an optional custom window). Use it to get an at-a-glance reli…
x402 paid API · 1 endpoint
url-uptime-checker.underscoredone.com Live x402
Checks whether a website or web address is currently reachable and reports how fast it responded.
x402 paid API · 1 endpoint
url2md.io Live x402
PDFs, JavaScript pages and ordinary HTML as clean Markdown. Pays a page's x402 toll for you. Follows robots.txt.
x402 paid API · 1 endpoint
url.openverbs.com Live x402
Two directions over query strings. action='parse' decodes a query string (with or without a leading '?') into an object, collapsing repeated keys into arrays. action='build' encodes a params object into a query string,…
x402 paid API · 4 endpoints
us-cm-kg.ai Live x402
One paid call on us-cm-kg.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record of record; allooloo.io: the estate scale block), public-record only, with an…
x402 paid API · 1 endpoint
usenami.io Live x402
Funding rates per venue for one crypto perpetual, or the whole cross-venue set in one call. Major CEX and DEX venues — Binance, Bybit, OKX, Bitget, Gate.io, KuCoin, Hyperliquid, Paradex, Orderly, Lighter and more. Each…
x402 paid API · 9 endpoints
uuid-forge.saastemly.com Live x402
Returns 1-100 random UUID v4 strings (RFC 9562): ?count=1..100 (default 1), ?format=uuid|urn|hex|int (default uuid). (2 paid endpoints on uuid-forge.saastemly.com.)
x402 paid API · 2 endpoints
Validate Agent Live A2A
Security and data-quality guardrails for AI agents. Stop prompt injections before they reach your LLM. Strip PII to stay compliant. Sanitize untrusted HTML without installing dependencies. Validate emails, URLs, JSON sc…
A2A agent · Validate Agent · 12 skills
vape-x402.vapex402.workers.dev Live x402
VAPE dex_volumes — DEX trading volume on a chain by venue, each with its logo (default Base) — real trading activity across the chain's exchanges. (15 paid endpoints on vape-x402.vapex402.workers.dev.)
x402 paid API · 12 endpoints
vaults.fyi Live x402
Retrieves a filtered list of vaults with their basic information including address, network, associated asset details, and transactional support status. (6 paid endpoints on api.vaults.fyi.)
x402 paid API · 6 endpoints
vaunt-dispatch-production.up.railway.app Live x402
True cost of trading xyz:COIN on Hyperliquid, measured on Vaunt's own IOC taker orders: slippage vs mid (p50/p90 bps), taker fee paid, wall-clock to fill, fill rate, against the venue-class median, plus spread, round-tr…
x402 paid API · 12 endpoints
vealth.net Live x402
Work tCO2e Accounting (CDP-settled mirror) — ecological accounting guidance from the production settle-to-retire mapping for a work type. NOT a credit, NOT a retirement.
x402 paid API · 1 endpoint
vedetta.dethboy.com Live x402
Recent analyst desk posts as a stream (?since_id=&asset=&limit=): cached, instant, half a cent. Poll it cheaply; escalate to a live read when something moves. Descriptive research, not financial advice. (3 paid endpoint…
x402 paid API · 3 endpoints
vending-machine-seven.vercel.app Live x402
Public URL status, latency, and response header subset for uptime and health agents (10 paid endpoints on vending-machine-seven.vercel.app.)
x402 paid API · 10 endpoints
vendsdk.com Live x402
Follow a public redirect chain with per-hop HTTP status (SSRF-safe) for security agents (14 paid endpoints on vendsdk.com.)
x402 paid API · 12 endpoints
vennatta-core.onrender.com Live x402
Extract structured text, summaries, or metadata from supplied document text or a public HTTP(S) document URL. (3 paid endpoints on vennatta-core.onrender.com.)
x402 paid API · 3 endpoints
verifiable-random.use.x402atlas.com Live x402
Verifiable Random pick — string selection with or without replacement bound to a future drand round the server waits for (typically 3-6s) and verifies locally, with a reproducible proof transcript. (3 paid endpoints on…
x402 paid API · 3 endpoints
verifier.quantumshieldlabs.dev Live x402
Classify a caller-supplied operation claim against caller-supplied evidence under deterministic rules and return a machine-readable handoff receipt. Use this when an orchestrator needs a consistent completion state befo…
x402 paid API · 2 endpoints
verify.clearsigned.com Live x402
Clearsigned — the trust layer with no stake in the outcome. Submit {claim, evidence[]}, receive an Ed25519-SIGNED, evidence-bearing receipt (verify offline against GET /pubkey; every receipt is chained in the public led…
x402 paid API · 1 endpoint
VerifyPulse Email Verification & DNS Security Live MCP
Real-time RFC 5322 email verification, SPF/DMARC DNS audits & B2B leads (x402 Base USDC).
MCP server · io.github.MohDev212
Verse Live A2A
Verse helps with hard questions in AI capabilities, markets, geopolitics, and science. Ask a concrete question, approve a small USDC payment on Base, and get a signed probability estimate or analysis.
A2A agent · Verse (autonomous agent) · 7 skills
vibesprings.net Live x402
Real-time BTC/USD price feed oracle. Retrieves live spot rate, 24h high/low, and volume directly from Coinbase Exchange. (25 paid endpoints on vibesprings.net.)
x402 paid API · 12 endpoints
video.cyberwarex.com Live x402
YouTube video metadata in one call: title, channel name and id, duration, upload date, view and like counts, description, thumbnail URL, the chapter list with start and end times, and the language plus kind (manual or a…
x402 paid API · 2 endpoints · check 88/100
visual.hugen.tokyo Live x402
Screenshot any public URL — returns base64 JPEG/PNG with metadata (page title, file size, render time). Full-page scroll capture, CSS selector targeting, device emulation (iPhone 15 Pro, Pixel 7, iPad Pro 12.9), dark mo…
x402 paid API · 4 endpoints
visuals.use.x402atlas.com Live x402
QR code generator — encode text, URLs, payment URIs, or arbitrary UTF-8 data as base64-encoded SVG or PNG in a JSON envelope. (2 paid endpoints on visuals.use.x402atlas.com.)
x402 paid API · 2 endpoints
VouchSpec Agent Skill Evidence Live A2A
Agent-only discovery for fresh, exact-commit Agent Skill validation. Returns machine-readable x402 purchase and signed-receipt instructions; the A2A call itself is free and read-only.
A2A agent · Plyrium · 1 skill
vrsai.tech Live x402
Check an exact npm or PyPI package version immediately before installation using current registry, vulnerability, malicious-package, withdrawal/deprecation, and verified provenance evidence. Returns ALLOW, REVIEW, BLOCK…
x402 paid API · 1 endpoint
watchevelive.com Live x402
Eve’s RWA print: which official number is the actual (T-bill, gold, NAV). Call for official prints, not casino coins. (3 paid endpoints on www.watchevelive.com.)
x402 paid API · 3 endpoints
waterpulse.theaslangroupllc.com Live x402
Live USGS river-gauge tick, deterministic. Answers "what is the flow at this gauge right now", "is this river high or low vs this week". Returns the latest streamflow (discharge, cfs) and gage height (ft) for one USGS s…
x402 paid API · 1 endpoint
wazir-x402.duckdns.org Live x402
PoolTogether draw-schema — volgende draw op Base/Arb/OP/Scroll (4 paid endpoints on wazir-x402.duckdns.org.)
x402 paid API · 4 endpoints

Related capabilities

On-chain data Trading & markets AI models & inference Maps & travel Research Agent infrastructure Security & trust Crypto 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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