Ethereum Transaction Builder

Ethereum Transaction Builder is an MCP server for Build and sign Ethereum transactions - EIP-1559, gas estimation, RLP, ERC-20 transfers. It supports STDIO transport.

Use the generated config in Install. This server runs with uvx transaction-mcp-server; add any required environment variables before starting your client.

Choose the Claude Desktop tab in Install and copy the config for uvx transaction-mcp-server. Add required environment variables before starting Claude Desktop.

Choose the Claude Code tab in Install and copy the config for uvx transaction-mcp-server. Add required environment variables before starting Claude Code.

Choose the Codex tab in Install and copy the config for uvx transaction-mcp-server. Add required environment variables before starting Codex.

Choose the Cursor or VS Code tab in Install and copy the config for uvx transaction-mcp-server. Add required environment variables before starting Cursor or VS Code.

Ethereum Transaction Builder uses STDIO transport. Use the package or command config in Install.

Ethereum Transaction Builder inventory is listed when the MCP endpoint exposes tools, resources, or prompts. Some servers require auth first.

Ethereum Transaction Builder does not advertise a verified auth requirement. If discovery fails, it may still need provider login, an API key, a bearer token, or a session header.