> For the complete documentation index, see [llms.txt](/llms.txt).

# Base

Base is an optimistic layer 2 rollup chain built by Coinbase on the MIT-licensed [OP Stack](https://docs.optimism.io/stack/getting-started#the-op-stack-today), in collaboration with [Optimism](/reference/optimism/).

The Base network provides seamless Coinbase integrations, easy fiat on-ramps, and access to more than 100 million users and $100 billion in assets in the Coinbase ecosystem.

See also

- The [official Base documentation](https://docs.base.org/) for more information.
- The official [Optimism Ethereum JSON-RPC API documentation](https://docs.optimism.io/node-operators/reference/op-node-json-rpc)(Bedrock release) for custom Base methods.

Select an option below to get started with the Base network.

[QuickstartLearn how to quickly connect and make calls to the Base network.](/reference/base/quickstart/)

[JSON-RPC APIsView the APIs available for communicating with the Base network.](/reference/base/json-rpc-methods/)

[Create an API keyLearn how to create and secure an API key.](/dashboard/get-started/create-api/)

## Endpoints[​](#endpoints "Direct link to Endpoints")

Connect

| Network           | Transport type          | URL                                                      |
| ----------------- | ----------------------- | -------------------------------------------------------- |
| Mainnet           | JSON-RPC over HTTPS     | https://base-mainnet.infura.io/v3/<YOUR-API-KEY> Copied  |
| Mainnet           | JSON-RPC over WebSocket | wss://base-mainnet.infura.io/ws/v3/<YOUR-API-KEY> Copied |
| Testnet (Sepolia) | JSON-RPC over HTTPS     | https://base-sepolia.infura.io/v3/<YOUR-API-KEY> Copied  |
| Testnet (Sepolia) | JSON-RPC over WebSocket | wss://base-sepolia.infura.io/ws/v3/<YOUR-API-KEY> Copied |