Ethereum Transaction Builder

Name: Ethereum Transaction Builder
Author: nirholas

by nirholasversion 1.0.0i★ 29 (Stars for the whole repo)iRuns on your computer

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

How to install

What it does

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

Connects Runs on your computer
Account or key No key needed
Category Crypto & blockchain

Install

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

Passed 2/3 checks · Runs on your computer · ✓ Commands checked Nov 13, 2026

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude, with some setup first

Install Python (uv) on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone

Let AI install it

Copy this message into a Claude chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server Ethereum Transaction Builder for Claude on this computer, in this order: 1) Check uv with uv --version. If it is missing, tell me to install it from https://docs.astral.sh/uv/getting-started/installation/; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): { "mcpServers": { "transaction": { "command": "uvx", "args": [ "transaction-mcp-server" ] } } } 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the Ethereum Transaction Builder tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install uv (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
uv --version
- A version number such as uv … = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: uv has no click-through installer. Copy the one-line command for your system (macOS or Windows) from uv’s official page into Terminal · no separate Python install needed; uv downloads it when required
Open the uv download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: uv --version
Install once; it works for everything that needs uv
Done
Open the Claude desktop app’s settings file
SettingsDeveloperEdit Config
Done

Paste these settings and save the file

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

Done

Quit Claude and open it again
Done
Try it
Use Ethereum Transaction Builder and tell me what you can do for me, then show me one thing
✓ If Claude says it is using Ethereum Transaction Builder or shows a Ethereum Transaction Builder tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect Ethereum Transaction Builder yet

Ethereum Transaction Builder runs on your computer, but ChatGPT can only connect servers that run on the web

What you can do instead

A · Use an app that can connect Ethereum Transaction Builder

Steps for Claude →Install Python (uv) on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone
Steps for Claude Code →Install Python (uv) on your computer first (one time)
Steps for Cursor →Install Python (uv) on your computer first (one time)
Steps for VS Code →Install Python (uv) on your computer first (one time)

B · Others in Crypto & blockchain that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Solana MCP by Vybe✓ ChatGPT
0xinsider✓ ChatGPT
Highwire✓ ChatGPT

Works with Claude Code, with some setup first

Install Python (uv) on your computer first (one time)

Let AI install it

Copy this message into a Claude Code chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server Ethereum Transaction Builder for Claude Code on this computer, in this order: 1) Check uv with uv --version. If it is missing, tell me to install it from https://docs.astral.sh/uv/getting-started/installation/; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): claude mcp add --scope user transaction -- uvx transaction-mcp-server 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the Ethereum Transaction Builder tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install uv (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
uv --version
- A version number such as uv … = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: uv has no click-through installer. Copy the one-line command for your system (macOS or Windows) from uv’s official page into Terminal · no separate Python install needed; uv downloads it when required
Open the uv download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: uv --version
Install once; it works for everything that needs uv
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done

Paste this command and press Enter

claude mcp add --scope user transaction -- uvx transaction-mcp-server

Done

Type /mcp in Claude Code
You should see Ethereum Transaction Builder listed as connected
Done
Try it
Use Ethereum Transaction Builder and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using Ethereum Transaction Builder or shows a Ethereum Transaction Builder tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor, with some setup first

Install Python (uv) on your computer first (one time)

Let AI install it

Copy this message into a Cursor chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server Ethereum Transaction Builder for Cursor on this computer, in this order: 1) Check uv with uv --version. If it is missing, tell me to install it from https://docs.astral.sh/uv/getting-started/installation/; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): { "mcpServers": { "transaction": { "command": "uvx", "args": [ "transaction-mcp-server" ] } } } 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the Ethereum Transaction Builder tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install uv (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
uv --version
- A version number such as uv … = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: uv has no click-through installer. Copy the one-line command for your system (macOS or Windows) from uv’s official page into Terminal · no separate Python install needed; uv downloads it when required
Open the uv download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: uv --version
Install once; it works for everything that needs uv
Done
Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use Ethereum Transaction Builder and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using Ethereum Transaction Builder or shows a Ethereum Transaction Builder tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code, with some setup first

Install Python (uv) on your computer first (one time)

Let AI install it

Copy this message into a VS Code chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server Ethereum Transaction Builder for VS Code on this computer, in this order: 1) Check uv with uv --version. If it is missing, tell me to install it from https://docs.astral.sh/uv/getting-started/installation/; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): { "servers": { "transaction": { "type": "stdio", "command": "uvx", "args": [ "transaction-mcp-server" ] } } } 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the Ethereum Transaction Builder tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install uv (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
uv --version
- A version number such as uv … = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: uv has no click-through installer. Copy the one-line command for your system (macOS or Windows) from uv’s official page into Terminal · no separate Python install needed; uv downloads it when required
Open the uv download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: uv --version
Install once; it works for everything that needs uv
Done
Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use Ethereum Transaction Builder and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using Ethereum Transaction Builder or shows a Ethereum Transaction Builder tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

JSON settings are under “For developers” below

Stuck? Ask people who use Ethereum Transaction Builder💬 Discussion →

For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

claude mcp add --scope user transaction -- uvx transaction-mcp-server

Claude Desktop (claude_desktop_config.json)

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

Cursor (~/.cursor/mcp.json)

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

VS Code (mcp.json)

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

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

At a glance

GitHub stars i: 29 (Stars for the whole repo)
This repo holds several MCP listings; its stars count once in rankings
Downloads per weeki: 17/wk
Licence i: No licence stated
Connection: Runs on your computer
Transport: stdio
Latest versioni: 1.0.0
Categoryi: Crypto & blockchain
Published to registryi: Jan 20, 2026
Code last changedi: Nov 14, 2026
Maker: nirholas
Packages: pypi: transaction-mcp-server
Repo: nirholas/ethereum-wallet-toolkit
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Run on your computer in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Raycast

All apps, with pros and cons →

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 16, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account nirholas, which owns the repo
✓ Pass
Still maintained
Code last changed 2 days ago
! Caution
Has a licence
GitHub could not identify the licence type; open the file to check
– 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

Published vulnerabilities (OSV.dev)

No entries on OSV.dev for transaction-mcp-server@1.0.0

Checks only this package version, not every dependency · checked Nov 16, 2026

What we check → · JSON

Makers: ask for a re-check or report wrong info

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Crypto & blockchaini

More stars than 0% of the other 1710 servers in this category
Published to the registry more recently than 1% of the other 1710 servers in this category
Basic checks equal to or better than 51% of the other 1710 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 2 of 3 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 2 days ago, 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: DexSQL, PayRam, DexPaprika, Alchemy MCP Server, X402 List MCP

Similar alternatives

Same category, other makers, commands already checked. Official ones first, then by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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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

What it does

Install

Install uv (if you don’t have it)

Open the Claude desktop app’s settings file

Paste these settings and save the file

Quit Claude and open it again

Try it

What you can do instead

Install uv (if you don’t have it)

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Install uv (if you don’t have it)

Click this button to open Cursor

Open the AI chat in Cursor in Agent mode

Try it

Install uv (if you don’t have it)

Click this button to open VS Code

Open the AI chat in VS Code in Agent mode

Try it

Installed on your computer

At a glance

Which apps can use it

Related guides

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

Published vulnerabilities (OSV.dev)

Discussion

User reviews

Compared with others in Crypto & blockchaini

Common questions

Similar alternatives

DexSQL

PayRam

DexPaprika

Alchemy MCP Server

X402 List 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