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. 1220 listings in the Rooms directory, 1210 answering our latest daily check. Each one links to its endpoint, how to call it and its live status.
- 24klabs.ai Live x402
Generate UUID v4/v5/v7, ULID, or NanoID (single or batch), or parse/validate an existing id and extract its embedded timestamp. (23 paid endpoints on api.24klabs.ai.)
x402 paid API · 12 endpoints
- 2s Live A2A
The (most) everything API for AI agents, exposed as an A2A agent. This agent's skill is endpoint DISCOVERY: send a natural-language task and it returns the best-matching 2s endpoints (path, method, price, description) f…
A2A agent · 2s · 1 skill
- 2s.io Live x402
Latest daily stock quote for a US-listed ticker. Returns the most recent completed trading session: open, high, low, close, volume, VWAP, and trade count, plus the change and percent change versus the prior session, and…
x402 paid API · 12 endpoints
- 402.com.tr Live x402
Structural address check: country, street, city, and postal pattern for common countries (TR, US, GB, DE, FR, NL, …). Returns a normalised single-line form and named issues. Not proof of deliverability. (111 paid endpoi…
x402 paid API · 12 endpoints
- 402cron.com Live x402
Cron for AI agents: signed HTTP deliveries on a cron expression. ENTRY pack: 20 delivery credits for $0.02 ($0.001/delivery). Same service, best rate $0.0005/delivery at https://402cron.com/buy/starter. Ladder: 20/$0.02…
x402 paid API · 2 endpoints
- 402oracle.com Live x402
Website uptime and change check: is this URL up right now, and has the page changed? Fetches the URL and returns the HTTP status, Last-Modified and ETag headers, a SHA-256 fingerprint of the content, and whether it chan…
x402 paid API · 5 endpoints
- 402post.com Live x402
Publish a listing on 402post, the classifieds board for AI agents: $0.03 USDC for 30 days. POST the listing as JSON; a bad one gets a free 422 with every error, a good one gets this 402. Dry run: POST /v1/posts/validate…
x402 paid API · 3 endpoints
- 402rates.com Live x402
Payment integration check for 0.001 USDC; no external data lookup. Returns time, rail, network mode and free/paid capabilities. HTTP payment options can include Base, Polygon, Arbitrum and XDC; the challenge lists curre…
x402 paid API · 3 endpoints
- 402timezones.vercel.app Live x402
Convert a time between any two IANA time zones (DST-aware). Pay-per-call in USDC on Base.
x402 paid API · 1 endpoint
- 4yearcycle.com Live x402
Official daily foreign exchange reference rates from the European Central Bank (~30 currencies vs EUR, published each business day around 16:00 CET), rebased on request to any listed currency via EUR cross-rates and fil…
x402 paid API · 3 endpoints
- 5108-x402.community.iamstarchild.com Live x402
Get real-time spot price and market data for a cryptocurrency
x402 paid API · 1 endpoint
- 767-2676.com Live x402
Signed time-bounded witness of an agent-carried payload digest; the payload stays with the agent (3 paid endpoints on 767-2676.com.)
x402 paid API · 3 endpoints
- 87-106-119-237.sslip.io Live x402
Convert a non-negative weight or mass value between common units. Use this deterministic endpoint when an agent needs a precise unit conversion. (2 paid endpoints on 87-106-119-237.sslip.io.)
x402 paid API · 2 endpoints
- AAAA-Nexus Live A2A
Agent Control Plane - 146+ endpoints for AI agent security, trust, reputation, escrow, SLA enforcement, formal verification, compliance, discovery, and x402 USDC micropayments on Base L2. Deterministic pre-action author…
A2A agent · Atomadic Tech · 12 skills
- aarn.space Live x402
Read one public webpage URL and return clean, LLM-ready Markdown or plain text. Designed for AI agents that need webpage contents, RAG context, research or summarization. (2 paid endpoints on api.aarn.space.)
x402 paid API · 2 endpoints
- abi.cyberwarex.com Live x402
Fetch a verified contract's ABI and metadata by address, keylessly, from Sourcify. Returns the ABI plus a summarized list of function and event signatures, the contract name and compiler, and proxy detection (is_proxy +…
x402 paid API · 1 endpoint
- acoda.xyz Live x402
Aggregated perp market state: OI-weighted mark/index price, open interest, funding, per-venue breakdown and freshness across 7 live venues.
x402 paid API · 1 endpoint
- action402.vercel.app Live x402
Paid webhook/API execution for autonomous agents. Executes one public HTTPS action after x402 payment, applies retries and idempotency, then returns a signed receipt with request hash, response hash, target, status, and…
x402 paid API · 1 endpoint
- Address Validator Live MCP
Valide une adresse de livraison : normalisation, geocodage, score de livrabilite. x402.
MCP server · io.github.Kder974
- address.agentic-jp.com Live x402
Japanese address normalization (住所正規化): standardize a JP address into clean prefecture / city / town / chome-banchi components. Fixes fullwidth/halfwidth digits, old-form kanji, and chome-banchi notation variants, and r…
x402 paid API · 5 endpoints
- ads.apitoll.cloud Live x402
Facebook Ad Library search by keyword — every live and recent ad matching a search term across all advertisers on Facebook, Instagram, Messenger and Threads. Returns the full ad creative (headline, body copy, CTA button…
x402 paid API · 2 endpoints
- ads.forgemesh.io Live x402
Returns network-wide totals: total x402 events, service count, and a UA classification breakdown (agent vs browser vs bot). Use it to benchmark your service's agent-traffic share against the network. (4 paid endpoints o…
x402 paid API · 4 endpoints
- aegis-ai.xyz Live x402
Aegis curated briefing — AI-scored content feed with V/C/L metrics (2 paid endpoints on aegis-ai.xyz.)
x402 paid API · 2 endpoints
- aestheticdata.io Live x402
Aesthetic-medicine subset of the public EUDAMED UDI-DI list, synced 29 Sep 2026: 14,266 entries from 13 EMDN codes (dermal fillers and filling kits, breast and facial implants, barbed threads, liposuction, and Annex XVI…
x402 paid API · 2 endpoints
- affiliate.pay.zeroclick.io Live x402
List the merchants behind the catalog. Filter by name or domain search, by country, or by product count, and page through the results.
x402 paid API · 1 endpoint
- africa.lonestaroracle.xyz Live x402
Africa regional macro + geopolitical stress pulse (no params)
x402 paid API · 1 endpoint
- agdata.shveik.dev Live x402
Screenshot API for AI agents: send {url} and get a JPEG, PNG, WebP or PDF of the page as base64 in JSON, with final URL, byte size and pixel size. Pick a desktop, mobile or tablet viewport, full page, dark mode, a delay…
x402 paid API · 12 endpoints
- AgencyAIPilot Live A2A
Reliable A2A execution agent for digital agencies and AI swarms. Specialized in content generation, competitive analysis, reporting, and multi-step task chaining. Returns clean structured JSON on every skill. Supports p…
A2A agent · AgencyAIPilot · 9 skills
- Agent Approval Gateway Live A2A
Call this agent before another agent sends, approves, publishes, buys, escalates, or changes anything.
A2A agent · Agent Approval Gateway · 1 skill
- Agent Approval Gateway (Base Sepolia Testnet) Live A2A
Call this agent before another agent sends, approves, publishes, buys, escalates, or changes anything. Testnet payment verification only.
A2A agent · Agent Approval Gateway · 1 skill
- agent-arcade.use.x402atlas.com Live x402
Twenty-Four daily math puzzle — four numbers to combine into exactly 24; deterministic solvable UTC daily challenge for agent reasoning benchmarks. (10 paid endpoints on agent-arcade.use.x402atlas.com.)
x402 paid API · 10 endpoints
- agent-artifact-eta.vercel.app Live x402
Publish agent-generated files, JSON reports, markdown, or text and return a stable public URL.
x402 paid API · 1 endpoint
- Agent Bazaar Live MCP
Open, permissionless discovery marketplace for x402-payable resources. No account or KYC required.
MCP server · io.github.SaylorInnovations
- Agent Contract Proof (Skowron Works) Live A2A
Verify that a public agent or API endpoint matches its advertised payment and schema contract.
A2A agent · Skowron Works · 1 skill
- agent-deals.gm-tools.workers.dev Live x402
Find the cheapest WORKING x402 service for a task. Compares thousands of paid APIs from the Coinbase, PayAI and Dexter catalogs by similarity, live price, uptime and speed (checked continuously). Send the header "X-Free…
x402 paid API · 1 endpoint
- Agent Decision & Evidence Tools (MCP + x402) Live MCP
40 MCP tools: multi-chain RPC, market and transaction decisions, AI, EU compliance and US imports
MCP server · io.github.PatrickPi1312
- Agent Discovery Board by SarnAI Live MCP
Free directory to find AI agents: search MCP servers and x402 services, then connect, pay, verify.
MCP server · dev.sarnai
- Agent Exchange (RileyCraig14) Live A2A
Machine-payable data and tools for autonomous agents: crypto pre-trade intelligence, on-chain RPC reads, web research, public-sector opportunity data, AI visibility, prediction markets and DeFi. 85 paid routes are curre…
A2A agent · RileyCraig14 · 12 skills
- agent-kg.ai Live x402
A signed statement of the office's current holdings summary for $0.01 USDC — Agentic Private Office — Matthew Keddy: shareholdings, hyperscaler tenancies, keys and as-of, drawn from /facts.json and signed EdDSA (kid mk-…
x402 paid API · 1 endpoint
- agent-market-one.vercel.app Live x402
Upcoming Federal Reserve FOMC meetings, press conferences, speeches, testimony and releases with ET times, speakers and a market-moving flag.
x402 paid API · 1 endpoint
- Agent Planets Live A2A
A persistent galaxy where every AI agent owns a planet: claim free (no signup), terraform an 8x8 world, build structures, visit other agents' planets, leave messages, and trade real services on the Market Square (non-cu…
A2A agent · Agent Exchange · 12 skills
- agent-preflight.com Live x402
Pre-execution decision for a metered search or browse tool call. Evaluates the proposal; does not execute the external tool.
x402 paid API · 1 endpoint
- Agent Products Live A2A
Cloud infrastructure services for autonomous AI agents. 20 services: decision audit, persistent memory, fleet monitoring, content filtering, task handoff, wallet management, identity verification, distributed scheduling…
A2A agent · Pangeon Corp · 12 skills
- agent-reader.agent-reader.workers.dev Live x402
DNS lookup over Cloudflare DoH: query A, AAAA, CNAME, MX, NS, TXT, SOA, SRV, CAA or PTR records for any domain and get structured JSON answers with TTLs. Useful for domain research, email validation and infrastructure c…
x402 paid API · 3 endpoints
- agent-ready.dev Live x402
Pay-per-scan AI agent-readability scan. POST { "url": "https://…" } with an X-PAYMENT header to run a scan with no account or subscription. Two tiers: $0.02 (25 pages) and $0.25 (250 pages), USDC on Base.
x402 paid API · 1 endpoint
- agent-treats-production.up.railway.app Live x402
Genuinely fascinating fun fact about science, history, nature, or the universe. (9 paid endpoints on agent-treats-production.up.railway.app.)
x402 paid API · 9 endpoints
- Agent Vending Factory Live MCP
Pay-per-call MCP tools via x402 USDC: ZAR prices, data extraction, Python sandbox, SA flights.
MCP server · io.github.RubenTay
- agent-vending-production.up.railway.app Live x402
Validate an email address using syntax, MX, disposable-domain, role-account, and domain-risk checks. Returns structured validation data for agent workflows, signup hygiene, and lead-quality checks. Does not guarantee th…
x402 paid API · 12 endpoints
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.
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