# OP Mainnet Sepolia RPC and network details

Source: https://www.alchemy.com/rpc/optimism-sepolia

OP Sepolia is the OP Stack’s Ethereum-aligned testnet supporting OP mainnet and other Superchain deployments that use Optimism's OP Stack.

## Network details

- Network: Sepolia
- Chain ID: 11155420
- Environment: Testnet
- Category: L2
- Native token: OP
- Gas token: ETH
- Settlement: Ethereum Sepolia
- Block time: 1-2s

## Endpoints

- Alchemy RPC: https://opt-sepolia.g.alchemy.com/v2/API_KEY
- Alchemy WebSocket: wss://opt-sepolia.g.alchemy.com/v2/API_KEY

Replace API_KEY with a key from https://dashboard.alchemy.com/signup.

## Alchemy product support

Supported on OP Mainnet Sepolia: RPC API, Transaction receipts API, User OP Simulation API, Debug API, Trace API, Bundler API, Token API, NFT API, Websockets, Gas Manager, Webhooks, Transfers API.

Not currently supported: Block Timestamp API, Prices API, gRPC.

## Build on Alchemy

Alchemy provides OP Sepolia RPC endpoints and a variety of devtools to help you test your code, including data APIs and debugging tools. Test exhaustively and ship confidently with Alchemy.

## Available networks

- OP Mainnet undefined: https://www.alchemy.com/rpc/optimism

## Links

- Alchemy docs: https://docs.alchemy.com/reference/optimism-api-quickstart
- Official docs: https://docs.optimism.io/
- Website: https://optimism.io/
- GitHub: https://github.com/ethereum-optimism
- Block explorer: https://sepolia-optimism.etherscan.io
- Bridge: https://app.optimism.io/bridge/deposit
- Faucet: https://www.alchemy.com/faucets/optimism-sepolia