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Uniswap Universal Router Decoder

io.github.Elnaril/uniswap-universal-router-decoder · v4.0.0

Decode and encode Uniswap Universal Router calldata (V2, V3, V4). Read-only: never signs or sends.

Connect Runs on your machine

Terminal
claude mcp add uniswap-universal-router-decoder -e RPC_URL=<RPC_URL> -- uvx uniswap-universal-router-decoder==4.0.0
claude_desktop_config.json
{
  "mcpServers": {
    "uniswap-universal-router-decoder": {
      "command": "uvx",
      "args": [
        "uniswap-universal-router-decoder==4.0.0"
      ],
      "env": {
        "RPC_URL": "<RPC_URL>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "uniswap-universal-router-decoder": {
      "command": "uvx",
      "args": [
        "uniswap-universal-router-decoder==4.0.0"
      ],
      "env": {
        "RPC_URL": "<RPC_URL>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "uniswap-universal-router-decoder": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "uniswap-universal-router-decoder==4.0.0"
      ],
      "env": {
        "RPC_URL": "<RPC_URL>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

NameDescription
RPC_URL
Optional
Ethereum RPC endpoint. Optional: only decode_transaction needs it.

Details

Package[email protected] (PYPI, stdio)
First published29 Oct 2026
Last updated29 Oct 2026
Registry nameio.github.Elnaril/uniswap-universal-router-decoder

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