Ethereum Transaction Builder

Name: Ethereum Transaction Builder
Author: nirholas

by nirholasversion 1.0.0i★ –iRuns on your computer

Registry nameio.github.nirholas/transaction-mcp-server

Install

Overview

Description from the maker (original English)

Build and sign Ethereum transactions - EIP-1559, gas estimation, RLP, ERC-20 transfers

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

PyPIPython’s uv installed (for the uvx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "transaction": {
      "command": "uvx",
      "args": [
        "transaction-mcp-server"
      ]
    }
  }
}

Run this in your terminal

claude mcp add transaction -- uvx transaction-mcp-server

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "transaction": {
      "command": "uvx",
      "args": [
        "transaction-mcp-server"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "transaction": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "transaction-mcp-server"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account nirholas, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32509 servers in this category
Published to the registry more recently than 1% of the other 32509 servers in this category
Basic checks equal to or better than 100% of the other 32509 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Ethereum Transaction Builder safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 10 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Fomu MCP

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Transaction MCP Server

An MCP (Model Context Protocol) server providing comprehensive Ethereum transaction capabilities including building, signing, decoding, and analysis for both legacy and EIP-1559 transactions.

Features

Tools (15 total)

Transaction Building & Signing

build_transaction - Build an unsigned transaction
sign_transaction - Sign a transaction with a private key
build_and_sign_transaction - Build and sign in one step

Transaction Decoding

decode_raw_transaction - Decode a signed raw transaction
decode_unsigned_transaction - Decode an unsigned transaction
recover_transaction_signer - Recover signer from signed transaction

Transaction Analysis

estimate_transaction_cost - Estimate gas cost in ETH
validate_transaction - Validate transaction fields
compare_transactions - Compare two transactions

Gas Utilities

convert_gas_units - Convert between wei, gwei, ether
calculate_max_cost - Calculate maximum transaction cost

Data Encoding

encode_transfer - Encode ERC-20 transfer calldata
encode_function_call - Encode arbitrary function call
decode_calldata - Decode transaction input data

Serialization

serialize_transaction - RLP encode a transaction

Resources (4 total)

transaction-types - Documentation on transaction types (Legacy, EIP-2930, EIP-1559)
gas-estimation - Guide to gas estimation and optimization
chain-ids - Chain ID reference for all networks
eip-1559 - EIP-1559 fee mechanism explained

Prompts (4 total)

build_transfer_workflow - Guide through building an ETH transfer
token_transfer_workflow - Guide through ERC-20 token transfers
decode_transaction_workflow - Help decode and analyze transactions
gas_optimization_workflow - Optimize transaction gas costs

Installation

pip install transaction-mcp-server

Or install from source:

cd transaction-mcp-server

pip install -e .

Usage

Run the server

transaction-mcp-server

Configure in Claude Desktop

"mcpServers": { "transaction": { "command": "transaction-mcp-server" } } }

Tool Examples

Sign a Simple Transfer

# Input

{ "to": "0x742d35Cc6634C0532925a3b844Bc9e7595f5b4E2", "value": "1000000000000000000", # 1 ETH in wei "nonce": 0, "chain_id": 1, "max_fee_per_gas": "30000000000", "max_priority_fee_per_gas": "2000000000", "private_key": "0x..." }

Output

{ "raw_transaction": "0x02f8...", "transaction_hash": "0x...", "from": "0xABC...", "to": "0x742...", "value_eth": "1.0", "type": "EIP-1559" }

Decode a Transaction

# Input

{ "raw_transaction": "0x02f8..." }

Output

{ "type": "EIP-1559 (Type 2)", "chain_id": 1, "nonce": 0, "to": "0x742...", "value_wei": "1000000000000000000", "value_eth": "1.0", "max_fee_per_gas_gwei": "30.0", "max_priority_fee_per_gas_gwei": "2.0" }

Transaction Types

Type	EIP	Description
Legacy (0)	-	Original Ethereum transactions
Access List (1)	EIP-2930	With access list for gas savings
Dynamic Fee (2)	EIP-1559	Base fee + priority fee model

Security Notes

Private keys are NEVER logged or persisted
Transactions are signed OFFLINE - no network connection
Raw transactions must be broadcast separately
For educational and development purposes only

Chain IDs

Chain	ID
Ethereum Mainnet	1
Goerli	5
Sepolia	11155111
Polygon	137
Arbitrum One	42161
Optimism	10
Base	8453

License

MIT

Ethereum Transaction Builder

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Fomu MCP

README from the maker

Transaction MCP Server

Features

Tools (15 total)

Transaction Building & Signing

Transaction Decoding

Transaction Analysis

Gas Utilities

Data Encoding

Serialization

Resources (4 total)

Prompts (4 total)

Installation

Usage

Run the server

Configure in Claude Desktop

Tool Examples

Sign a Simple Transfer

Output

Decode a Transaction

Output

Transaction Types

Security Notes

Chain IDs

License