Ethereum Transaction Builder

Name: Ethereum Transaction Builder
Author: nirholas

by nirholascommunityv1.0.0

An MCP server for Ethereum transaction handling, including building, signing, decoding, validating, and analyzing legacy and EIP-1559 transactions. It also provides utilities for gas conversion, calldata encoding/decoding, serialization, and transaction cost estimation.

From the registry: Build and sign Ethereum transactions - EIP-1559, gas estimation, RLP, ERC-20 transfers

GitHub Repository

Install & configure

Prerequisites

required
Install Python package
Install the MCP server from PyPI using pip.
```
$ pip install transaction-mcp-server
```
https://pypi.org/project/transaction-mcp-server/.

Install in your client

Paste into the AI you're chatting with — it will figure out the rest

Please install the `transaction-mcp-server` MCP server into my current AI client (that's you).

Required prerequisites (do these first if not already done):
- **Install Python package** — Install the MCP server from PyPI using pip. Run: `pip install transaction-mcp-server` (https://pypi.org/project/transaction-mcp-server/.)

Canonical MCP server config (stdio transport):
- command: `transaction-mcp-server`
- args: []

Note: The README also shows a source install path (`pip install -e .`), but the PyPI install is the simplest portable option. No environment variables are documented. The server runs locally over stdio and signs transactions offline; broadcasting must be done separately.

Add this MCP server to my current client's config in the correct format for you. If you need secrets or credentials I haven't provided, ASK me — do not invent values or leave raw placeholders. After adding it, tell me how to verify the server is connected.

Note: The README also shows a source install path (`pip install -e .`), but the PyPI install is the simplest portable option. No environment variables are documented. The server runs locally over stdio and signs transactions offline; broadcasting must be done separately.

Tools (15)

build_transaction

Build an unsigned transaction

sign_transaction

Sign a transaction with a private key

build_and_sign_transaction

Build and sign a transaction in one step

decode_raw_transaction

Decode a signed raw transaction

decode_unsigned_transaction

Decode an unsigned transaction

recover_transaction_signer

Recover the signer from a signed transaction

estimate_transaction_cost

Estimate gas cost in ETH

validate_transaction

Validate transaction fields

compare_transactions

Compare two transactions

convert_gas_units

Convert between wei, gwei, and ether

calculate_max_cost

Calculate maximum transaction cost

encode_transfer

Encode ERC-20 transfer calldata

encode_function_call

Encode an arbitrary function call

decode_calldata

Decode transaction input data

Packages

transaction-mcp-server

pypiv1.0.0transport: stdio

Details

Language: HTML
License: MIT
Released: Jan 20, 2026
Last commit: Mar 30, 2026
Registry name: io.github.nirholas/transaction-mcp-server

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