keeper-scvd/x402-endpoint-readiness

scvd.store x402 endpoint readiness corpus scvd.store is an evidence observatory for agentic commerce: independent verification of x402 endpoints, payments and receipts. Before an agent pays an x402 endpoint, we check that it can be paid. After it pays, we check the signed receipt. Over time we watch endpoints and publish a dated, signed corpus. Sellers use it to prove a door works; buyers use it before spending. Every artifact is signed, expires, and names what we did not see. Not escrow, not a rating, not a guarantee.

This dataset is that corpus: one snapshot per weekly round of the public x402 discovery list, recording which hosts were listed, which answered, and what a single conformance probe saw at that moment. Hash-chained, ed25519-signed, each digest submitted to OpenTimestamps for Bitcoin anchoring. Dated observations of moments, never scores on operators.

Files File What it is corpus.json The index: schema.org Dataset metadata, every entry, the chain check, and the verification steps. 1.json … N.json One signed round each: snapshot, digest, signature, public_key, ots (the OpenTimestamps proof). tiers.json The per-host tier fractions, alphabetical, with the rule, the denominator and the rows beside each. A new numbered file is added each signed round. The live copy is always at https://scvd.store/corpus.json, and every artifact verifies free at https://scvd.store/api/verify/{id}.

Denominators Every fraction in this corpus is published with its rule, its denominator and its rows. Coverage caveats ride inside each round verbatim: which hosts were listed, which were walked, and the percentage between them. Nothing here is a ranking of one host against another.

Update cadence One round per week, taken on the Sunday walk, appended as a new numbered file and a new version on Zenodo. A week the walk did not run is a missing number, said so, never backfilled.

Limitations One probe per host per round, at indexer cadence: a door that was down for the minute of the probe reads as unreachable for the week. The population is the public x402 discovery list plus hosts the store has met; a door not listed anywhere is not here. The probe reads the 402 challenge and the signed offer; it does not pay, so it says whether a door can be paid, not whether it delivers. Tiers and fractions are derived and published with their rule, denominator and rows; they are not scores of operators and must not be read as rankings. Verification Recompute any snapshot's sha256, check the signature against the key at https://scvd.store/.well-known/scvd-signing-key, walk the previous_digest chain back to the first entry, and run ots verify on the Bitcoin-anchored proof. The exact steps, field order included, are printed on corpus.json itself.

Citation Concept DOI (all versions): https://doi.org/10.5281/zenodo.22284887

Record Creative Co. LLC (2026). scvd.store x402 endpoint readiness corpus. Zenodo. https://doi.org/10.5281/zenodo.22284887 Licence CC BY 4.0. Reuse names the original source: https://scvd.store/corpus