Optimism Sepolia Testnet API

Compare the best Optimism Sepolia testnet APIs and RPC providers. Find the fastest RPC for testing your OP Stack dApps.

Best RPC for Optimism Sepolia

Optimism Sepolia is the official testnet for the Optimism ecosystem. Compare providers for reliable testnet RPC endpoints.

Get Optimism RPC - OKX

Top Optimism Sepolia Providers

Public RPC

Official Optimism endpoints

  • RPC URLFree
  • WebSocketNo
  • Rate LimitBasic
  • SupportDocs
View Docs

QuickNode

Fast and reliable infrastructure

  • RPC URLAvailable
  • WebSocketYes
  • API Calls/moTiered
  • Support24/7
Try QuickNode

Alchemy

Developer-first platform

  • RPC URLAvailable
  • WebSocketYes
  • Free TierYes
  • SupportPriority
Try Alchemy

Optimism Sepolia Setup

Configure your environment for Optimism Sepolia testnet:

MetaMask Configuration

Add Optimism Sepolia: Network Name: Optimism Sepolia, RPC: https://sepolia.optimism.io, Chain ID: 11155420

Testnet Faucet

Get testnet ETH from the Optimism faucet or use a bridge from Ethereum Sepolia.

Block Explorer

View testnet transactions at: https://sepolia-optimism.etherscan.io