ProofCheck for Claude.ai

io.github.something-agent/proofcheck

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

client:Claude.ai transport:streamable-http tools:5

Install ProofCheck in Claude.ai

Settings → Connectors → Add custom connector

https://proofcheck.something-agent.workers.dev/mcp

Claude on the web takes a remote URL and completes OAuth in the browser. For a packaged server use Claude Desktop or Claude Code instead. Claude.ai docs

What Claude.ai can do once it is connected

verify_offer
verify_receipt
verify_payment_required
preflight_x402_endpoint
lookup_erc8004_agent

ProofCheck in other clients

Claude Code
Claude Desktop
Cursor
VS Code
Zed
Windsurf
Cline
Gemini CLI
Grok
ChatGPT
LangChain

ProofCheck MCP server