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Build on Ethereum

Resources to start your Ethereum journey

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Developer Primer

If you're new to Ethereum or blockchain development, read our development primer to help you get started on your journey.

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Testnets

Sepolia

Usage: Apps
Support Ends: Dec 2026
Network ID: 11155111
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Hoodi

Usage: Validators
Support Ends: Dec 2028
Network ID: 560048
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Ephemery

Usage: Anything
Restarts: Every 28 Days
Network ID: 39438145
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Holesky

Usage: Validators
Support Ends: Q4 2025
Network ID: 17000
Add to Metamask

L2 Sepolia

Usage: Apps
Support Ends: Dec 2026

Build on Ethereum L1

Getting Started

Python Dev

Grants

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Build on Ethereum L2s

Getting Started

Resources

Enterprise

Create Your Own L2

General

Using OP Stack

Using Arbitrum Orbit

Using ZK Stack

Using Polygon CDK

Research

Protocol R&D

General

Breakout Groups

R&D Pages

Research Groups

R&D Blogs

Tooling

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