{"registry":"GVP Conformant Services","spec":"https://x402toll.com/v1/spec","version":"0.2","updated":"July 2026","badge":"https://x402toll.com/v1/gvp/badge.svg","verifier":"https://x402toll.com/v1/gvp/check","howToJoin":["Implement GVP-1 on your responses: a formula/method trace, versioned public sources + data vintage, and a reproducible sha256 responseHash over {endpoint, inputs, result, method, dataVintage}. See the spec.","POST a sample response to https://x402toll.com/v1/gvp/check to confirm it is self-consistent and GVP-1 conformant.","When conformant, the check returns an `embed` snippet — paste the badge on your site. The badge is a self-consistency claim (non-endorsement) that links back to the verifier."],"members":[{"service":"Tollbooth","url":"https://x402toll.com","role":"reference implementation + spec author","conformance":"GVP-Receipt","tools":59,"evidence":{"spec":"https://x402toll.com/v1/spec","golden":"https://x402toll.com/v1/golden/:id","verify":"https://x402toll.com/v1/verify","receiptPubkey":"https://x402toll.com/.well-known/receipt-pubkey.json"}}],"note":"A public list of services that follow the Golden-Vector Provenance standard. Listing means a service self-declares GVP conformance and links to a reproducible check — it is NOT an endorsement of any member’s data correctness by x402toll.com. Verify any member yourself via the neutral verifier.","license":"CC0"}