What changed.

Every change to the service that a customer could notice, newest first. Subscribe at /changelog.atom. Last entry: 2026-09-12.

2026-09-12The fee schedule and the terms as pages of their own

/pricing renders the fee schedule as a page, and /terms carries the full terms of service; every receipt now links to /terms, and the site map lists both.

An unpaid request now gets its 402 together with a preflight: the exact problems the paid retry would be refused for (address shape, body schema, spec problems, tier rules, idempotency key shape), and a hint that says do not pay yet. A buyer is corrected before signing a payment; catalog probers still see their 402.
The status page lists why every paid request was refused (status and error code) for the last 7 days.
A reused Idempotency-Key explains that a repeat purchase needs a fresh key.

A request without a payment now reaches the 402 storefront whatever its body; requests that carry a payment are still validated before settlement, so nothing is ever charged for a request that cannot run.
The OpenAPI document now lists each verdict tier as its own operation and carries what catalog probers read: x-payment-info with the price in USD, a required request body with an example a prober can send, response schemas, security markers on free and secret protected routes, and guidance for agents in info.x-guidance. A favicon is served at /favicon.ico.
A bare GET on a paid POST route now answers the same 402 storefront as the POST, instead of 404: catalogs probe paid URLs with GET, and humans click them. A paid GET is refused with 405 and never charged.
Every request to a paid route is now counted by the stage it reached (402 issued, refused before payment, paid attempt, settled) and shown on /status for the last 7 days, together with the user agents that knock on paid routes. Daily aggregates only; no addresses, no bodies.

A changelog at /changelog with an Atom feed at /changelog.atom, so every release is new content a crawler can read.
The status page now shows a public ledger: verdicts settled and webhooks delivered in the last 30 days, uptime, and visits by AI crawler family.
robots.txt invites AI search and answer engines explicitly and points at a real sitemap; an IndexNow key file lets Bing, Yandex, Naver, and Seznam be told about changes directly.
/.well-known/x402.json mirrors the payment manifest under the name catalogs probe, and /.well-known/agent-tools.json describes the service for agent tool directories.
A visible questions section on the landing page, and structured data naming every product and price, the witness tier included.

Payments settle on Base and Solana through the Coinbase CDP facilitator with PayAI as fallback.
The four verdict tiers are listed in the CDP x402 Bazaar after their first settled payments; every paid route advertises its bare path so the reputation read can be listed too.
Designed pages for the human-facing links: /manual, /status, and the probe policy at /bot.
Browser based x402 clients can pay: the API allows the PAYMENT-SIGNATURE header and exposes the 402 and receipt headers.

POST /v1/verdicts/witness ($0.25): one live URL probe, answered synchronously as a signed verdict that embeds a signed observation of what was seen, aimed at agent false success.
Every network check carries an observations array: final URL, redirect hops, HTTP status, resolved address, TLS certificate details, capped headers, raw body sha256.
Idempotent replays are served in front of the paywall; unsettled purchases are voided; sworn pass 2 retries three times and then issues FAILED.
Every regex and JSON Schema evaluates in a worker thread with a CPU timeout.
Reputation reports add an amount weighted fulfillment rate and payer concentration signals; ERC-1271 smart wallet signatures are accepted.

Container, persistent volume for the database and signing key, always-on scheduler.