Witnessd MCP Server

by jschuntervip.witnessd/witnessdv0.1.1

MCP server for witnessd — have a neutral third party witness, timestamp and archive any URL or API response, with Merkle anchoring on Base. Pays per-call via x402 (your wallet) or an API key.

0Node.jsstdioofficial registry

context tax

queued

security

queued

cold start

queued

freshness

Maintained56d ago

Install Witnessd MCP server

claude mcp add witnessd -e EVM_PRIVATE_KEY='<evm-private-key>' -e WITNESSD_API_KEY='<witnessd-api-key>' -- npx -y witnessd-mcp

{
  "mcpServers": {
    "witnessd": {
      "command": "npx",
      "args": [
        "-y",
        "witnessd-mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<evm-private-key>",
        "WITNESSD_API_KEY": "<witnessd-api-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "witnessd": {
      "command": "npx",
      "args": [
        "-y",
        "witnessd-mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<evm-private-key>",
        "WITNESSD_API_KEY": "<witnessd-api-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "witnessd": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "witnessd-mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<evm-private-key>",
        "WITNESSD_API_KEY": "<witnessd-api-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "witnessd": {
      "command": "npx",
      "args": [
        "-y",
        "witnessd-mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<evm-private-key>",
        "WITNESSD_API_KEY": "<witnessd-api-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
WITNESSD_URL	—	—	Base URL of the witnessd service (default https://witnessd.vip)
EVM_PRIVATE_KEY	—	yes	Wallet key used to auto-pay x402 invoices in USDC on Base (either this or WITNESSD_API_KEY)
WITNESSD_API_KEY	—	yes	Prepaid witnessd credit key (alternative to EVM_PRIVATE_KEY)

Freshness

Maintained — last maintenance signal 56d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-08-15 · 56d ago · GitHub
Latest release
no data · GitHub
Package published
no data · npm/PyPI
Registry entry updated
2026-08-15 · 56d ago · official registry · v0.1.1

FAQ

›How do I install the Witnessd MCP server in Claude Code?

Run: claude mcp add witnessd -e EVM_PRIVATE_KEY='<evm-private-key>' -e WITNESSD_API_KEY='<witnessd-api-key>' -- npx -y witnessd-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Witnessd require an API key?

Yes. It expects EVM_PRIVATE_KEY, WITNESSD_API_KEY, of which 2 are secrets.

›Can I use Witnessd as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is Witnessd in the official MCP registry?

Yes, as vip.witnessd/witnessd.