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

• aialign.halowerk.com Live x402

  Calculates each group positive-outcome rate, compares it with an explicit or automatically selected reference group, and reports rate differences and selection-rate ratios. Aggregate disparity metrics do not establish d…

  x402 paid API · 10 endpoints · check 88/100

• intel.halowerk.com Live x402

  q verwendet echtes SQLite FTS5, zusätzlich stehen Namespace und Tagfilter bereit. Die verifizierte Zahleradresse ist der Eigentümer; Ergebnisse und gespeicherte Daten sind strikt auf diesen Zahler begrenzt. (6 paid endp…

  x402 paid API · 6 endpoints · check 88/100

• staging.toolkit.dev Live x402

  Add a new memory. This method is called every time the user informs anything about themselves, their preferences, or anything that has any relevant information which can be useful in the future conversation. This can al…

  x402 paid API · 1 endpoint · check 88/100

• wailand.tailf99551.ts.net Live x402

  Call this when an agent needs current significant global disaster events — e.g. before routing logistics or assessing exposure. Returns ALL matching normalized GDACS multi-hazard alerts (earthquake, cyclone, flood, volc…

  x402 paid API · 3 endpoints · check 88/100

• You.com Live x402

  Skip the groundwork with our AI-ready Web Search APIs, delivering advanced search capabilities to power your next product.

  x402 paid API · 2 endpoints · check 83/100

• api.agentstools.dev Live x402

  Keyword news search across web news engines (Bing/DuckDuckGo/Yahoo via ddgs). Returns dated headlines with title/url/snippet/source/image + freshness/region/safesearch filters.

  x402 paid API · 12 endpoints · check 80/100

• CoinGecko Live x402

  Search onchain DEX pools and token, by contract address, name, or token symbol.

  x402 paid API · 12 endpoints · check 80/100

• Rooms paid tools (x402) Live x402

  7 pay-per-call lookups for agents, paid with USDC on Base over x402, no account or key: x402 trust check, Rooms agent verification, Wallet snapshot, ERC-20 token facts, ENS resolve, Web page to markdown, Email address c…

  x402 paid API · Rooms by Aurmada · 7 endpoints

• Rooms pay-per-call rooms (x402) Live x402

  Post to, read and search public Rooms rooms from any x402 wallet, no sign-up: Post to a public agent chat room POST /x402/v1/rooms/post; Read a public agent chat room GET /x402/v1/rooms/read; Find public agent chat room…

  x402 paid API · Rooms by Aurmada · 3 endpoints

• hyperextend Live x402

  By-the-minute Hyperliquid market-data archive, paid per request via x402 (no signup, no API key). Serves history Hyperliquid exposes no endpoint for (open interest and funding over time, HIP-3 perps (equities, commoditi…

  x402 paid API · 8 endpoints · check 43/100

• 21millionpixels.art Live x402

  Paint one pixel on 21millionpixels.art, a shared 21,000,000-pixel canvas. Reads are free; paid pixels skip the human cooldown. (2 paid endpoints on 21millionpixels.art.)

  x402 paid API · 2 endpoints

• 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.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

• 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.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

• 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-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-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-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-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-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

• agent.api.0x.org Live x402

  Get the indicative price for a swap using Allowance Holder to set allowances

  x402 paid API · 1 endpoint

• agent.apiguru.app Live x402

  Live Amazon offer and inventory data for up to 10 ASINs: every active offer with seller, price, shipping and condition, which one holds the buy box, and optionally the real purchasable stock quantity. Built for repricin…

  x402 paid API · 10 endpoints

• agent.atinamos.co.uk Live x402

  Deterministic JSON validation and conservative repair for AI-agent payloads. Repairs unquoted object keys, single-quoted strings, trailing commas, Markdown code fences, UTF-8 BOMs and JSON-compatible Python literals, in…

  x402 paid API · 1 endpoint

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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