# The Opening Day

_one launch check, seven days of conformance watch, and your passport page, at one URL_


X402 launch check with a week of signed daily monitoring and a passport page.

## At a glance

- **Attests:** The launch check's whole walk (endpoint, moment, User-Agent, every stage, the quoted amount after a 2xx, payment_attempt evidence, the seller-named transaction where one came back, the field wallet) and its evidence hash, which the purchase certificate binds in its attests field. A signed watch commission binds the same URL, purchase certificate and original service dates; each daily pass is signed on its own at the history URL. The passport is the census's own signed, expiring object.
- **Input:** url (query parameters; input schema and checkout: https://scvd.store/menu/opening_day?view=compact)
- **Output:** The launch check's signed JSON walk record (verdict, every stage, what was paid, the settlement transaction where one came back), its evidence hash bound into the purchase certificate's attests field; a conformance watch opened on the same door for seven days, each daily pass signed alone at a history URL; the host's endpoint passport URL; and one bundle URL (/api/opening-day/{cert_id}) naming all three, free to read forever. Instant to open; the week fills in day by day and never renews itself. 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:** $9 USDC fixed, covering a 7-day term, one payment; nothing here charges again by itself, ever — there is no mechanism that could; delivered instantly
- **Does not attest:** Anything about any other moment, buyer, or the seller generally: one transaction once, seven daily looks, and a page that names its own stale date. The three under one certificate are still three observations, not a grade. Replay byte recovery does not establish artifact truth or usefulness; changed bytes do not establish fresh fulfillment. Never a badge, never a score, never a guarantee the door stays up.

## About this item

Name your x402 endpoint (the url query parameter) and three things happen under one certificate. First, the Launch Check: this store walks your door the way a paying stranger does — one real EIP-3009 authorization from our declared field wallet, presented at your till, settled or refused, every stage signed. Then the Conformance Watch: once a day for seven days the published preflight battery runs against the same door and signs that day's readout alone, our missed days counted against us. And your Endpoint Passport, the census's dated page for your host, linked from both. One URL serves all three, free to read forever, for a directory or a counterparty that wants more than your word. Bought apart these cost ten dollars and come as a receipt each. Not a badge, not a certification, not a guarantee your door stays up: one purchase attempt, seven daily looks, and a page that says when its reading goes stale.

- **id:** `opening_day`
- **price:** $9 fixed, covering a 7-day term, one payment; nothing here charges again by itself, ever — there is no mechanism that could
- **fulfillment:** delivered instantly
- **buy:** `GET https://scvd.store/api/buy/opening_day?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/opening_day` quotes free and refuses the paid request without it; no money moves.
- **sample:** https://scvd.store/samples/launch-check.json
- **does not prove:** Anything about any other moment, buyer, or the seller generally: one transaction once, seven daily looks, and a page that names its own stale date. The three under one certificate are still three observations, not a grade. Replay byte recovery does not establish artifact truth or usefulness; changed bytes do not establish fresh fulfillment. Never a badge, never a score, never a guarantee the door stays up.

House rules: give your x402 endpoint in the url query parameter: https, default port, on the public internet; the launch check is one real purchase attempt from the declared field wallet, once — never a retry loop; we pay at most $0.05 at your till; a costlier cheapest rail gets a signed record of exactly where the check stopped instead of a payment; the payto is sanctions-screened before any payment, and no screen means no payment — the rule fails closed; the watch is one pass a day for seven days, each signed alone; it ends after seven days and never renews itself; we refuse our own hostname — a report about our own till, signed by us, would be the instrument vouching for itself; the bundle url, the check url and the watch history are free to read forever.

> Nine dollars for opening day: we buy from your till once, watch the door for a week, and put the passport beside both. Bought apart it is ten, and a receipt each.

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).