witnessd MCP

A neutral third-party witness server that allows AI agents to independently fetch, hash, timestamp, and archive any URL or API response. It provides cryptographic evidence via signed certificates and Merkle proofs anchored on the Base blockchain, enabling dispute resolution and verification of counterparty data without trusting the source.

Visit witnessd

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Vendor evidenceLocal stdioSource reviewed; not executedOperated by witnessd

You need:no account, no key, no humanPrepaid API key (100¢) — needed for scheduled watches

Vendor documentation

What you can do with it

Fetch and hash a URL or API endpoint response
Archive content with a signed certificate
Verify snapshot integrity using Merkle proofs
Schedule periodic witnessing of endpoints

Source and maintenance

Vendor evidenceRegistry 0.1.1

mcp-registry: vip.witnessd/witnessd@0.1.1 Source repository

Maintenance checked: Oct 31, 2026, 10:27 PM UTC

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

witnessd-mcp 0.1.1

npm

witnessd-mcp package definition

{
  "version": "0.1.1",
  "transport": "stdio",
  "identifier": "witnessd-mcp",
  "registryType": "npm",
  "environmentVariables": [
    {
      "name": "WITNESSD_URL",
      "format": "string",
      "description": "Base URL of the witnessd service (default https://witnessd.vip)"
    },
    {
      "name": "EVM_PRIVATE_KEY",
      "format": "string",
      "description": "Wallet key used to auto-pay x402 invoices in USDC on Base (either this or WITNESSD_API_KEY)"
    },
    {
      "name": "WITNESSD_API_KEY",
      "format": "string",
      "description": "Prepaid witnessd credit key (alternative to EVM_PRIVATE_KEY)"
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.

Cursor configuration

{
  "mcpServers": {
    "witnessd-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "witnessd-mcp@0.1.1"
      ],
      "env": {
        "WITNESSD_URL": "<YOUR_WITNESSD_URL>",
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>",
        "WITNESSD_API_KEY": "<YOUR_WITNESSD_API_KEY>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.

Cline configuration

{
  "mcpServers": {
    "witnessd-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "witnessd-mcp@0.1.1"
      ],
      "env": {
        "WITNESSD_URL": "<YOUR_WITNESSD_URL>",
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>",
        "WITNESSD_API_KEY": "<YOUR_WITNESSD_API_KEY>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.

VS Code configuration

{
  "servers": {
    "witnessd-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "witnessd-mcp@0.1.1"
      ],
      "env": {
        "WITNESSD_URL": "<YOUR_WITNESSD_URL>",
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>",
        "WITNESSD_API_KEY": "<YOUR_WITNESSD_API_KEY>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.

Claude Desktop configuration

{
  "mcpServers": {
    "witnessd-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "witnessd-mcp@0.1.1"
      ],
      "env": {
        "WITNESSD_URL": "<YOUR_WITNESSD_URL>",
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>",
        "WITNESSD_API_KEY": "<YOUR_WITNESSD_API_KEY>"
      }
    }
  }
}

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