Chainweb API MCP Server: Install & Setup

Install Chainweb API in Claude Code

npm

Claude Code

claude mcp add chainweb-api -e PACT_COMMUNITY_WORKSPACE_ROOT=... -e PACT_COMMUNITY_CHAINWEB_MODE=... -- npx -y @pact-community/mcp-chainweb

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "chainweb-api": {
      "command": "npx",
      "args": [
        "-y",
        "@pact-community/mcp-chainweb"
      ],
      "env": {
        "PACT_COMMUNITY_WORKSPACE_ROOT": "...",
        "PACT_COMMUNITY_CHAINWEB_MODE": "..."
      }
    }
  }
}

npm

Claude Code

claude mcp add chainweb-api -e PACT_COMMUNITY_WORKSPACE_ROOT=... -- npx -y @pact-community/mcp-pact

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "chainweb-api": {
      "command": "npx",
      "args": [
        "-y",
        "@pact-community/mcp-pact"
      ],
      "env": {
        "PACT_COMMUNITY_WORKSPACE_ROOT": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the Chainweb API MCP server do?

Chainweb HTTP API: local sim, pre-signed send, poll, table reads, SPV proofs, module deploys.

Is the Chainweb API MCP server free?

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Does Chainweb API run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add Chainweb API to Claude Code?

Run: claude mcp add chainweb-api -e PACT_COMMUNITY_WORKSPACE_ROOT=... -e PACT_COMMUNITY_CHAINWEB_MODE=... -- npx -y @pact-community/mcp-chainweb

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