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W3

W3 is an open-source Go library for integrating applications with Ethereum through RPC, ABI bindings and EVM tools.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

W3 — OpenViST project profile in Developer Tools.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use W3 when a Go application needs Ethereum RPC access, contract ABI handling or an EVM simulation and testing environment.

Who it is for

  • Go developers adding Ethereum connectivity to a server or utility
  • Developers working with Solidity contract functions and events
  • Teams simulating EVM execution or testing smart contracts

Documented uses

  • Connect a Go application to an Ethereum node using HTTP, WebSocket or IPC.
  • Batch RPC calls such as balance and nonce queries.
  • Create ABI bindings from Solidity function and event signatures.
  • Simulate EVM execution, trace transactions or test contracts.
Before you choose

Requirements & limits

The repository is public and specifies the MIT license. Installation is documented with Go's `go get` command.

  • The RPC client supports HTTP, WebSocket and IPC connections.
  • Batch requests can combine calls into a single round trip; the repository describes this as a way to speed up RPC work.
  • Mainnet state forking and state caching are documented options for the EVM environment.
  • W3 is closely linked to go-ethereum.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Add W3 to a Go project and connect to Ethereum RPC

Install the library and create an RPC client for an Ethereum node.

Before you start

  • A Go project
  • An Ethereum RPC endpoint using HTTP, WebSocket or IPC

Steps

  1. Add the library with the command below.

    Documented command
    go get github.com/lmittmann/w3

  2. Use w3.Dial with an RPC endpoint to create a client.

  3. Close the client when it is no longer needed.

Expected outcome

A Go application has a W3 client connected to an Ethereum RPC endpoint.

Guide limitations

  • The guide covers client setup; it does not configure or provide an RPC endpoint.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
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Sources checked
9 October 2026
Original website title
lmittmann/w3 · Official homepage title · retained in its source language
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