GVP Registry
Services that follow Golden-Vector Provenance — every answer is reproducible, cited, and independently checkable without trusting the server.
Members
| Service | Conformance | Tools | Evidence |
|---|---|---|---|
| Tollbooth reference implementation + spec author |
GVP-Receipt | 59 | spec · golden · verify |
Updated July 2026 · spec v0.2 · registry.json
Get the badge (self-serve)
Prove your service is GVP-conformant and embed the badge:
- 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.
The badge SVG lives at https://x402toll.com/v1/gvp/badge.svg (optional ?service=YourName).
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. Standard is CC0; adopt it freely.