ProofCheck

by FastDrop

MCP MCP VERIFIED Verified 1 hour ago Registry import free

Free x402 offer/receipt checker: verifies signatures and whether the signer fits the host.

Free x402 offer/receipt checker: verifies signatures and whether the signer fits the host. Official MCP Registry: io.github.something-agent/proofcheck@0.1.0. Remote endpoint: https://proofcheck.something-agent.workers.dev/mcp

Problem it solves

Discoverable MCP server listed in the official MCP Registry.

How it's different

Remote MCP endpoint ingested from the official registry and probed by FastDrop.

Ingested from the official MCP Registry

FastDrop pulled this entry from the official MCP Registry as io.github.something-agent/proofcheck and probed the endpoint. The maker did not submit it, so the outbound link is not endorsed and the description is not theirs.

If this is your server, claim the listing to edit it and take ownership. The registry index lists everything else still awaiting a probe.

Claim this listing

Tools this endpoint exposes

Read directly from the endpoint on 27 Oct 2026. Not supplied by the maker.

verify_offer
Verify an x402 signed offer (EIP-712 or JWS): signature, expiry, match to accepts[], and signer-authorization evidence (payTo, did:web, DNS _controllers, ERC-8004). Free.
verify_receipt
Verify an x402 signed receipt (EIP-712 or JWS) returned in the settlement response: signature, freshness, payer/resource/transaction match, signer-authorization evidence. Free.
verify_payment_required
Verify every signed offer inside a PaymentRequired object (pass the decoded JSON, or the raw base64 PAYMENT-REQUIRED header). Free.
preflight_x402_endpoint
Unpaid preflight of an x402 URL: fetch its 402, summarise accepts[]/extensions, verify any signed offers and report who can vouch for the signer. Never pays. Free.
lookup_erc8004_agent
Read-only ERC-8004 identity lookup (owner, agentWallet, registration file, endpoint-domain verification) on Ethereum, Base, Optimism, Arbitrum, Polygon, BNB, Avalanche, Gnosis, Celo, Linea or Scroll.