All servers · Agent payments (x402) · Payments & accounting · Crypto & blockchain

ProofCheck

io.github.something-agent/proofcheck · v0.1.0

New (7 days)

Measured by MCP Station

Last check	Reachable
Checked at	—
Check success 7 / 30 days	—
First-try success 30 days	—
Median response	—
Lookups 30 days	—
Authentication	No auth
MCP version	2025-06-18
Rank score	—
Declared risk	Not declared (tools carry no read/destructive hints)
Capabilities declared	tools
Tool definitions	5 tools · with description 100% · input schema is an object 100% · read/destructive hints 0%

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

streamable-http · https://proofcheck.something-agent.workers.dev/mcp

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

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

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.

Repository · Website · JSON · Text for agents · Registry updated 2026-10-27