--- title: "Seller declarations" description: "Declare receiving addresses with proof of control and compare their digests with dated observations of a public payment endpoint." canonical: "https://scvd.store/seller-declarations" url: "https://scvd.store/seller-declarations" --- # Seller declarations Declare receiving addresses with proof of control and compare their digests with dated observations of a public payment endpoint. ## What this is Declare receiving addresses with proof of control and compare their digests with dated observations of a public payment endpoint. ## Proposition Declare receiving addresses with proof of control and compare their digests with dated observations of a public payment endpoint. ## Price Free to submit and read. ## For money $300 USD buys a 30-day pilot for one endpoint, daily checks and one final evidence report; invoiced after delivery, with no automatic renewal. ## Free first Free to submit and read; the declaration and its comparison remain available without buying a watch or report. ## How to call ### Prepare POST https://scvd.store/api/seller-declaration with action: prepare and the declaration below; use the returned exact statement or hash. Preparation stores nothing. ### Example #### Action prepare #### Declaration ##### Artifact seller_declaration ##### Version 1 ##### Host your-host.example ##### Declares ###### Pay to - YOUR_PUBLIC_RECEIVING_ADDRESS ###### Networks - eip155:8453 ###### Valid from CURRENT_UTC_TIMESTAMP_WITH_MILLISECONDS ### Host Serve the returned sha256 as a whitespace-separated token at https://{host}/.well-known/scvd-note.txt, maximum 4096 bytes, without a redirect. POST action: attach, evidence: well_known and the identical declaration. ### Wallet POST action: attach, evidence: wallet_signature, the identical declaration and signatures keyed by each normalized EVM address. Each wallet signs the exact prepared statement with personal_sign. Every address must appear in the last observed challenge for this host. This proves wallet control, not host control; host declarations take precedence. Use the host lane for new hosts, rotations or Solana. ### Read GET https://scvd.store/api/seller-declaration?host=your-host.example. The comparison also rides /corpus/host/{host}.json and the held half of /api/look/v1. ### Dates Use valid_from within ten minutes of attachment. A new declaration must have a later valid_from. Comparisons begin only after both valid_from and our attachment time; submitting the same declaration never renews its date. ### Queue An accepted declaration asks the existing bounded sweep to read the host. Up to 100 requested hosts are selected per week; this is not a guaranteed probe. Publish your endpoint in /.well-known/x402; /api/declare-door explains how. ## Errors - **Invalid request** — 400: check the fields and use the exact prepared statement. - **Proof failed** — 403: prove the exact statement with the host file or every named wallet. - **Host proof required** — 403: use the host file for unobserved hosts, address rotations or an existing host declaration. - **Stale statement** — 409: prepare a new statement with a current valid_from timestamp. - **Older statement** — 409: use a timestamp later than the retained declaration. - **Declaration capacity** — 409: contact the notice desk; the retained history is full. - **Rate limited** — 429: wait for Retry-After before submitting again. - **History unavailable** — 503: retry later; no finding is inferred. ## Security ### Secrets Only public receiving addresses and signatures; never keys, credentials or wallet secrets. Nothing sends a payment. ### Storage Only address digests are retained and returned; up to 100 dated declarations per host support historical comparisons. Public hashes allow someone who already knows an address to test it. ### Proof Host proof uses one bounded HTTPS read with redirects refused and the shared public-target rules. Wallet proof recovers each EVM signer. A shared wallet is not host ownership. ### Limits Two dated artifacts compared, not a finding of fraud or proof of host ownership. Wallet rotation, shared checkout addresses and stale declarations can explain a mismatch. Networks are declared context; this comparison checks address digests only. ## States - **Match** — Every captured address digest is declared. - **Mismatch** — At least one captured address digest is not declared. - **Not captured** — The last probed row captured no address. - **Not probed** — No probe after this declaration became effective and was attached. - **No declaration** — No effective declaration is held. ## Next steps ### Free #### URL #### Description Free to submit and read; the declaration and its comparison remain available without buying a watch or report. ### Report #### URL #### Description $300 USD buys a 30-day pilot for one endpoint, daily checks and one final evidence report; invoiced after delivery, with no automatic renewal. #### Scope Daily payment-interface checks and a review report; no declaration-change alerts. ## Watch ### ID conformance_watch ### Name The Conformance Watch ### Why Daily conformance observations for a bounded term; no declaration-change alerts. ### Price $5 fixed, covering a 7-day term, one payment; nothing here charges again by itself, ever — there is no mechanism that could ### Price USDC 5 ### Cadence term ### Term days 7 ### Buy URL ### Buy URL template >