io.github.something-agent/proofcheck

up checked 2026-11-11T05:38:25.754Z

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Publisher-provided title

ProofCheck

Publisher-provided description

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

Summary by lookupd

Verifies x402 payment offers and receipts, checks signer identity and authorization, and previews endpoints without paying.

Install

Claude Code, remote (streamable-http)

claude mcp add --transport http proofcheck https://proofcheck.something-agent.workers.dev/mcp

Codex, remote (streamable-http)

codex mcp add proofcheck --url https://proofcheck.something-agent.workers.dev/mcp

Cursor, remote (streamable-http) → .cursor/mcp.json

{
  "mcpServers": {
    "proofcheck": {
      "url": "https://proofcheck.something-agent.workers.dev/mcp"
    }
  }
}

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Tools (5 tools)

Publisher-provided text

• 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-80
• verify_receipt Verify an x402 signed receipt (EIP-712 or JWS) returned in the settlement response: signature, freshness, payer/resource/transaction match, signer-authorization
• 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. Fr
• lookup_erc8004_agent Read-only ERC-8004 identity lookup (owner, agentWallet, registration file, endpoint-domain verification) on Ethereum, Base, Optimism, Arbitrum, Polygon, BNB, Av

Details

• Version: 0.1.0
• Transports: streamable-http
• Uptime (7 days): 100%
• Median latency: 251 ms
• First indexed: 2026-11-01T09:55:49.849Z
• Last seen in registry: 2026-11-01T09:55:49.849Z
• Repository: https://github.com/something-agent/proofcheck
• Website: https://proofcheck.something-agent.workers.dev

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• 62071 servers
• Last crawl: 2026-11-11T16:39:06.253Z
• API base: https://api.lookupd.com
• MCP URL: https://api.lookupd.com/mcp