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Ethereum Transaction Builder MCP server

by nirholas·io.github.nirholas/transaction-mcp-server·v1.0.0·29 stars
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Build and sign Ethereum transactions - EIP-1559, gas estimation, RLP, ERC-20 transfers

A92/100grade A
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Safety scan
A92/100

full report

Adoption
Growing

29 stars28 downloads/wk

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Ethereum Transaction Builder tools (17, 2 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • analyze_transaction

    Decode and analyze a transaction in detail.

  • build_transaction

    Build an unsigned Ethereum transaction.

  • calculate_gas_for_data

    Calculate the intrinsic gas cost for transaction data.

  • compare_transactions

    Compare two transactions field by field.

  • convert_gas_units

    Convert between Ethereum value units.

  • decode_calldata

    Decode transaction calldata.

  • decode_raw_transaction

    Decode a raw signed transaction.

  • encode_approve

    Encode an ERC-20 approve function call.

  • encode_function_call

    Encode an arbitrary function call.

  • encode_transferwrite action

    Encode an ERC-20 transfer function call.

  • encode_transfer_fromwrite action

    Encode an ERC-20 transferFrom function call.

  • estimate_transaction_cost

    Estimate the total cost of a transaction.

  • get_gas_estimate

    Get gas estimates for common operations.

  • recover_transaction_signer

    Recover the signer address from a signed transaction.

  • sign_transaction

    Sign an Ethereum transaction offline.

  • sign_transaction_object

    Sign a pre-built transaction object.

  • validate_transaction

    Validate a transaction's fields.

Public scan report

scanner v0.1.10 · 2026-11-14 · same rubric, same numbers if you re-run it

no findings
  • Code scan20 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 1 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 92/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Ethereum Transaction Builder compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
92/100
higher than 93% of 48,114 servers
Tools
17
the typical server has 7
Tools that change things
12%
typical: 0%. Fewer write tools means less an agent can break
GitHub stars
29
more than 91% of 28,851 servers
Downloads a week
28
more than 9% of 15,093 servers with a package

What its tools let an agent do: 15 read · 2 change

Install Ethereum Transaction Builder in Claude Code, Cursor or VS Code

claude mcp add transaction-mcp-server -- uvx transaction-mcp-server
Add to Cursor

What the publisher says

From the Ethereum Transaction Builder repository's README, as published. We do not edit it. Read it on GitHub

Ethereum Wallet Toolkit

A collection of Ethereum wallet tools: Python CLI utilities (ethtoolkit.py, wallet.py, keystore.py, sign.py, transaction.py, typeddata.py, validate.py, vanity.py), five Model Context Protocol (MCP) servers exposing wallet functionality to AI assistants, a fully offline single-file HTML wallet (offline.html), and an x402 payment facilitator. See the sections below for each component.

Offline Build - Official Ethereumjs Libraries

This directory contains the build system to create offline1.html using official ethereumjs libraries.

Libraries Used

All libraries are from the official Ethereum ecosystem:

  • @ethereumjs/tx - Transaction signing (legacy + EIP-1559)
  • @ethereumjs/util - Utilities (address validation, checksums, etc.)
  • @ethereumjs/rlp - RLP encoding
  • @ethereumjs/wallet - Wallet utilities
  • ethereum-cryptography - Official cryptographic primitives (secp256k1, keccak256)
  • @scure/bip39 - BIP39 mnemonic (used by ethereumjs)
  • @scure/bip32 - BIP32 HD derivation (used by ethereumjs)

Build Instructions

# Navigate to this directory
cd offline-build

# Install dependencies
npm install

# Build offline1.html
npm run build

The output file offline1.html will be created in the parent directory.

What Gets Bundled

The build process uses esbuild to:

  1. Bundle all ethereumjs libraries and their dependencies
  2. Minify the code for smaller file size
  3. Inline everything into a single HTML file

Typical bundle size: ~400-600 KB (varies by version)

Features

All features match the CLI tool:

  • Wallet Generation - Random keypair generation
  • Mnemonic Support - Create/restore BIP39 mnemonics, derive accounts
  • Vanity Addresses - All vanity options (prefix, suffix, regex, etc.)
  • Message Signing - EIP-191 personal_sign
  • Signature Verification - Recover signer from signature
  • Validation - Address and key validation
  • Keystore - V3 keystore encrypt/decrypt (PBKDF2)
  • Transactions - Sign legacy and EIP-1559 transactions offline
  • EIP-712 - Typed data signing and verification

Security

  • The generated HTML file is completely self-contained
  • No external network requests
  • Can be saved and used on an air-gapped machine
  • Uses official, audited Ethereum libraries

MCP Servers

This repository includes 5 Model Context Protocol (MCP) servers that expose Ethereum wallet functionality to AI assistants like Claude.

Documentation

  • Prompt Examples - Real-world prompts for interacting with the servers
  • Testing Guide - How to run and write tests
  • Integration Guide - Setting up with Claude Desktop and other tools
  • Workflows & Recipes - Common workflows combining multiple servers

Overview

Total: 57 tools, 348 tests

Quick Start

Installation

Each server is a standalone Python package:

# Install all servers
pip install -e ./ethereum-wallet-mcp
pip install -e ./keystore-mcp-server
pip install -e ./signing-mcp-server
pip install -e ./transaction-mcp-server
pip install -e ./validation-mcp-server

Claude Desktop Configuration

Add to your claudedesktopconfig.json:

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Ethereum Transaction Builder: common questions

Is Ethereum Transaction Builder MCP server safe?
Yes, by our scan: it is graded A (92/100). Read the Ethereum Transaction Builder safety report
How do I install Ethereum Transaction Builder?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Ethereum Transaction Builder need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Ethereum Transaction Builder maintained?
The last commit was 2 days ago (2026-11-13). The latest release is v1.0.0.
How does Ethereum Transaction Builder compare with other MCP servers?
safety score 92/100 (higher than 93% of 48,114 servers); tools 17 (the typical server has 7); tools that change things 12% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

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