@proofslip/mcp-server

MCP server for ProofSlip — receipt-based verification for AI agent workflows. Create, verify, and poll ephemeral receipts that let agents prove what happened before deciding what happens next.

Tools

Tool	Auth	Description
`create_receipt`	API key	Create a receipt (action, approval, handshake, resume, failure)
`verify_receipt`	None	Verify a receipt and retrieve full data
`check_receipt_status`	None	Lightweight status poll (no payload)
`signup`	None	Get a free API key (500 receipts/month)

Setup

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "proofslip": {
      "command": "npx",
      "args": ["-y", "@proofslip/mcp-server"],
      "env": {
        "PROOFSLIP_API_KEY": "ak_your_key_here"
      }
    }
  }
}

Cursor

Add to MCP settings:

{
  "mcpServers": {
    "proofslip": {
      "command": "npx",
      "args": ["-y", "@proofslip/mcp-server"],
      "env": {
        "PROOFSLIP_API_KEY": "ak_your_key_here"
      }
    }
  }
}

Claude Code

claude mcp add proofslip -- npx -y @proofslip/mcp-server

Then set your API key in your environment or .env file.

Environment Variables

Variable	Required	Description
`PROOFSLIP_API_KEY`	For creating receipts	Your ProofSlip API key (starts with `ak_`)
`PROOFSLIP_BASE_URL`	No	API base URL (default: `https://proofslip.ai`)

Get an API Key

Use the signup tool from any MCP client, or:

curl -X POST https://proofslip.ai/v1/auth/signup \
  -H "Content-Type: application/json" \
  -d '{"email": "you@example.com", "source": "api"}'

License

ISC