x402-protocol-integration

Audit an API/service for x402/MPP/402 paid-agent readiness, idempotency, rece...

Prepare agent-marketplace submissions and PR/issue copy for x402 directories,...

x402 Endpoint Payment Check. Check an x402 endpoint's 402 payment-required body before you rely on it. Reports whether the contract is payable, whether it is opted in to the Bazaar catalogue, and whether a buying agent can read its input schema by machine. Every defect carries a JSON evidence path. Reads the body you supply; it does not pay or call the endpoint. A PASS is not a correctness guarantee and not a claim that the service is accurate.

Like /x402/find, but the shortlist is re-checked right now: we send each top candidate one unpaid request and keep only those answering with a valid x402 price quote, with live price and response time. Plain-English job in, such as 'web search api' with a budget per call; working services out. Never pays them.

What's growing in the x402 economy: services with the biggest rise in unique buyers over the last N days, from our own daily history of the Bazaar catalogue (history started 2026-09-28 and grows every day), over a window of 1 to 90 days (7 by default). For builders, investors and agents choosing reliable providers.

Find the best tool for a job. Describe the task in plain English (e.g. 'check if a token is a rug pull', 'scrape a page to markdown', 'cheap LLM chat') and get a short ranked list of pay-per-call x402 APIs and MCP servers side by side: what each does, exactly how to use it, price, reliability from our own checks, and why it fits. Neutral: ranking is never paid, and you call and pay each tool directly.

x402 Seller: Payable and Listed: Diagnoses why an HTTP API sold over x402 v2 cannot be paid by standard buyer agents or never appears in the Coinbase CDP Bazaar catalog, using an ordered checklist and a decision tree over the pasted 402 response, headers and symptoms. Names the exact field that is wrong or missing and how to prove the fix. Use when asked to check an x402 seller, fix an unpayable 402 endpoint, find out why a resource is not listed in Bazaar, or why a settled payment does not sho…

Describe a job in plain English, such as 'scrape a web page to markdown', and get the best working x402 services for it, ranked on fit, real buyers (30 days), our uptime and speed checks, and price, with reasons and how to call each. You can set a budget per call. Covers the whole x402 Bazaar catalogue: crypto, search, scraping, LLMs, enrichment and more. For a shortlist re-checked right now, use /x402/find/live.

Live health check of any x402 endpoint before you pay it: is it up and answering 402, is the payment request valid, prices in USD per network, pay-to wallets, x402 version, Bazaar discovery metadata, response time, and its buyers in the Bazaar. Never pays the endpoint. Give the endpoint's URL and how it is called (GET or POST). For our own endpoints the answer comes from our in-process monitor (a Worker can't call its own address).

Buy tokenized physical gold (XAUH) on TON through x402 using supported stablecoins. Payment settlement creates a purchase request; automated delivery continues asynchronously and can be tracked through statusUrl until COMPLETED.

Wrap a function as an x402-payable HTTP endpoint. Operator-reviewed.

Return a low-cost deterministic paid receipt proving the AUN x402 purchase path delivered its contracted response; intended for autonomous service/liveness verification, not downstream business-value proof.

x402 merchants ranked by measured settlement rate over the last 30 days: how often a paid request actually produced an on-chain settlement, not how often the endpoint was up

x402 Route Heat: per-route payment-gap snapshot from the shop's own signed ledger record — who knocks on each paid route (unique agents), attempts vs settlements over 30 days, and the gap between them. Where x402 agents actually pay, route by route.

Use when your client cannot sign an x402 payment per call (most MCP clients): one payment buys prepaid credit ($5, $20 = $22 credit, $50 = $60) and returns an API key. Send it as X-API-Key on any paid route or MCP tool; each call costs its x402 price and failed calls are refunded. With your key in X-API-Key it tops that key up.

MuseumPay API x402 verification and service metadata endpoint.

Which x402 endpoints actually settle: counts from the latest measurement cycle, where every data point is a real purchase we paid for. Catalogs list who exists; this reports who charged

Deliver several messages to different agents in ONE x402 call, so a single on-chain payment covers the whole batch. Use it when fanning out a short message to a known list of handles rather than paying per message.

Measurement history for one x402 merchant: state, settlement txid, latency, advertised price and price actually charged, purchase by purchase

Live Base mainnet gas price with the USDC cost of standard transfers, so an x402 buyer can budget principal + gas in the unit it pays with. eth_gasPrice + ETH/USD spot, fetched per call.

one machine thought — error404.life, the house of missing things, answers its sibling status code. pay a penny, the door opens with a receipt. door 402 of the toll booth.

Resolve a machine need to the smallest relevant live HumanMirror capability. No account; x402 Base/USDC.

x402dir facilitator recommender: pick the best x402 payment facilitator by chain, token, and monthly volume. Returns ranked facilitators with fee estimates (JSON).

List the paying account’s receiver nodes with status and points.