# The Shop Window


Machine-readability audit of a page, signed.

## At a glance

- **Attests:** The whole report: the page named, the moment, the criteria version, the verdict, every check and advisory, the blind spots, and the report's evidence hash. The purchase certificate binds the same evidence hash in its attests field.
- **Input:** url (query parameters; input schema and checkout: https://scvd.store/menu/onpage_audit?view=compact)
- **Output:** A signed JSON report — verdict (ready, not_ready, unreachable or refused), every check and advisory from the published on-page battery, the blind spots printed on the artifact, dated, its evidence hash bound into the purchase certificate's attests field — plus a stable report URL serving the record free forever. Instant; one GET of the HTML as served, never a render, never monitoring. Every artifact carries a cert_id and verifies free at https://scvd.store/api/verify/{cert_id}.
- **Cryptography:** ed25519 signature by this store's key, published at https://scvd.store/.well-known/scvd-signing-key and carried inside every 402
- **Verify:** GET https://scvd.store/api/verify/{cert_id} — free, no account, no rate limit, checkable offline with the published key
- **Price and fulfilment:** $3 USDC fixed, one-off; nothing here charges again by itself, ever — there is no mechanism that could; delivered instantly
- **Does not attest:** What a browser would show. The battery reads the HTML as served — script-rendered content is invisible to it and the report says so on itself. Not an endorsement, not a ranking claim, and nothing about any other moment.

## About this item

Name a public page (the url query parameter) and the store GETs it once, reads the HTML the way a machine passerby does — title, meta description, canonical, robots directives, headings, JSON-LD structured data, link shape — and signs the whole readout: verdict, every check, every advisory, dated. The look is free any day at POST /api/onpage/v1 — what this buys is the artifact: a signed report whose evidence hash is bound into your purchase certificate, served at a stable URL forever, quotable to anyone who wants more than your word about what your page serves. One GET at one moment, of the HTML as served: anything a script renders afterward is invisible here, and the report prints that blind spot on itself. Not an SEO grade, not a ranking claim, not an endorsement.

- **id:** `onpage_audit`
- **price:** $3 fixed, one-off; nothing here charges again by itself, ever — there is no mechanism that could
- **fulfillment:** delivered instantly
- **buy:** `GET https://scvd.store/api/buy/onpage_audit?url=<url>` (USDC over x402 v2 on Base, Polygon, Arbitrum, World, Solana, Arc (Circle Gateway), or USDC over MPP (evm/charge) on Base for every shelf item, every publication page and the commission desk)
- **required inputs:** `url` — fill the `<url>` slot above before paying. The bare door `GET https://scvd.store/api/buy/onpage_audit` quotes free and refuses the paid request without it; no money moves.
- **sample:** https://scvd.store/samples/onpage-audit.json
- **does not prove:** What a browser would show. The battery reads the HTML as served — script-rendered content is invisible to it and the report says so on itself. Not an endorsement, not a ranking claim, and nothing about any other moment.

House rules: give the page in the url query parameter: https, default port, on the public internet; one get at one moment, of the html as served; scripts never run, and the report names that blind spot on itself; the criteria are the free desk's published battery (get /api/onpage/v1); the audit runs those checks and no others; we refuse our own hostname — an audit of ourselves signed by ourselves would be the instrument vouching for itself; the report url is free to read forever.

> Three dollars. The window is free to look through — what costs money is the signed note saying what was in it.

Optional next work: You run an x402 endpoint and need to see whether unfamiliar agents can find, understand and shop it. [Agent shopping audit — The Aura Walk — scope, price and free starting point](https://scvd.store/operators#shopping-audit).