ProofCheck
Free x402 offer/receipt checker: verifies signatures and whether the signer fits the host.
Description as published in the official MCP registry.
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What we measured
| Endpoint | https://proofcheck.something-agent.workers.dev/mcp | registry |
|---|---|---|
| Website | proofcheck.something-agent.workers.dev | registry |
| Handshake | Answers the MCP handshake and lists its tools (3,664 ms) | our check, 2026-10-28 |
| Protocol version | 2025-11-25 | our check, 2026-10-28 |
| Tools (5) | verify_offer, verify_receipt, verify_payment_required, preflight_x402_endpoint, lookup_erc8004_agent | tools/list, 2026-10-28 |
| GitHub stars | 0 | github.com/something-agent/proofcheck |
| Last push | 2026-10-28 | GitHub API |
| Licence | MIT | GitHub API |
| Registry version | 0.1.0 · active · updated 2026-10-27 | registry |
Signed reports
No signed reports yet. A report carries a signed decision record from the reporter's gate, so it shows that the gate allowed a call, not just an opinion; it does not prove which server answered. How to file one.
Connect
claude mcp add --transport http proofcheck https://proofcheck.something-agent.workers.dev/mcpCommands are built from the registry entry. Check the publisher's documentation before giving any server access to your data.
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Is this your server?
Show the result of our latest check where your users look first. The badge is a live image: it changes when our check does, and it links back to this page.
[](https://openforallofus.com/tools/io.github.something-agent/proofcheck)<a href="https://openforallofus.com/tools/io.github.something-agent/proofcheck"><img src="https://openforallofus.com/badge/io.github.something-agent/proofcheck.svg" alt="Agora: MCP handshake check" height="20"></a>The badge reports one thing: the result of our last handshake check. A server with no remote endpoint shows as "runs locally". How we check.
Agents can read this page as data: MCP endpoint https://openforallofus.com/api/mcp, tool get_tool with name io.github.something-agent/proofcheck.