Ethereum & EVM Message Signing MCP Server

An MCP (Model Context Protocol) server providing comprehensive Ethereum message signing capabilities including EIP-191 personal_sign and EIP-712 typed structured data. Its 12 documented tools cover sign, typed, data, message.

People connecting communication tools to Claude, Cursor, VS Code, or another MCP client. The project is written in HTML.

One of 5 MCP servers published from nirholas/ethereum-wallet-toolkit. Stars and repository activity are shared across all of them. See all 5 →

VERIFIED ACTIVE

LAST COMMIT 2026-08-17 · VERIFIED 2026-08-25

NOASSERTION · HTML · how we verify → /methodology

01 · Install Ethereum & EVM Message Signing

Claude Code

claude mcp add nirholas-ethereum-wallet-toolkit-signing -- uvx signing-mcp-server

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "nirholas-ethereum-wallet-toolkit-signing": {
      "command": "uvx",
      "args": [
        "signing-mcp-server"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license no standard license detected - usage rights unclear; check the repo before commercial use

pypi package signing-mcp-server - check the name against the project README before installing (PyPI has no namespace ownership)

registry namespace io.github.nirholas is GitHub-verified and matches the repo owner

03 · What Ethereum & EVM Message Signing can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

With this server connected, an agent can verify an EIP-191 signed message, verify an EIP-712 typed data signature, and convert between signature formats (27/28 vs 0/1 for v).

Capability map

Tools grouped from the project's README - what Ethereum & EVM Message Signing lets an agent do.

Sign

4 tools - e.g. Sign a text message using EIP-191 personal_sign format; Sign hex-encoded bytes using EIP-191 format; Sign EIP-712 typed structured data

sign_message · sign_message_hex · sign_typed_data · sign_hash

Verify

2 tools - e.g. Verify an EIP-191 signed message; Verify an EIP-712 typed data signature

verify_message · verify_typed_data

Recover

2 tools - e.g. Recover signer address from a signed message; Recover signer from typed data signature

recover_signer · recover_typed_data_signer

Hash

1 tool - e.g. Compute EIP-712 hash without signing

hash_typed_data

Decompose

1 tool - e.g. Break down signature into v, r, s components

decompose_signature

Compose

1 tool - e.g. Compose signature from v, r, s components

compose_signature

Normalize

1 tool - e.g. Convert between signature formats (27/28 vs 0/1 for v)

normalize_signature

04 · Who maintains Ethereum & EVM Message Signing

Ethereum & EVM Message Signing is maintained by nirholas. We track 66 MCP servers from nirholas - 65 actively maintained, 7,658 combined GitHub stars, oldest repo from Feb 2024. Full record: all servers from nirholas.

05 · Facts

repository: github.com/nirholas/ethereum-wallet-toolkit
category: communication - actively maintained as of 2026-08-25.
registry: io.github.nirholas/signing-mcp-server (active, first published 2026-01-20)
packages: pypi:signing-mcp-server

06 · Ethereum & EVM Message Signing FAQ

Is Ethereum & EVM Message Signing still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-17. We re-verify nightly.

What can Ethereum & EVM Message Signing do?

With this server connected, an agent can verify an EIP-191 signed message, verify an EIP-712 typed data signature, and convert between signature formats (27/28 vs 0/1 for v).

How do I install Ethereum & EVM Message Signing?

Run `uvx signing-mcp-server`. You can also paste the ready-made client config above.

Does Ethereum & EVM Message Signing run locally?

Yes - it's a stdio server: it runs on your machine (via uvx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Ethereum & EVM Message Signing

Alternatives to Ethereum & EVM Message Signing

Maintained communication servers if Ethereum & EVM Message Signing isn't the fit.

Pairs well with

Servers that cover what Ethereum & EVM Message Signing doesn't - only shown when the pairing reason fits the companion.

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