# Base

> Base Mainnet and Base Sepolia through RPC Gateway, with chain IDs, provider coverage, and the calls served without an Endpoint.

Canonical page: https://rpc.aurpay.net/docs/chains/base

Base is an EVM rollup in the Gateway catalog and uses ETH for gas. Its Mainnet and Sepolia networks each have their own Gateway, Access Point, and Routes.

## Networks and hosts

| Network | Chain ID | JSON-RPC Host |
|---|---:|---|
| Mainnet | 8453 | `base-jsonrpc` |
| Sepolia | 84532 | `base-sepolia-jsonrpc` |

Take the deployed Access Point from the dashboard. Base Sepolia is chain 84532 and is unrelated to Ethereum Sepolia (11155111), even though both carry the Sepolia name.

## Provider coverage

| Provider | Mainnet | Sepolia | Notes |
|---|:---:|:---:|---|
| [Alchemy](https://rpc.aurpay.net/docs/providers/alchemy.md) | Yes | Yes | Enable Base for the API key in the Alchemy dashboard |
| [QuickNode](https://rpc.aurpay.net/docs/providers/quicknode.md) | Yes | Yes | A multichain Endpoint is expanded into one Gateway Endpoint per network |
| [Chainstack](https://rpc.aurpay.net/docs/providers/chainstack.md) | Yes | Yes | Only nodes in the **running** state are imported |
| [dRPC](https://rpc.aurpay.net/docs/providers/drpc.md) | Yes | Yes | Generated from the dRPC public network catalog |
| [Tenderly](https://rpc.aurpay.net/docs/providers/tenderly.md) | Yes | Yes | Matched to the Gateway catalog by EVM chain ID |

## Reads without an Endpoint

Base uses the shared EVM Endpoint-free set: `eth_blockNumber`, `eth_getBlockByNumber` with `["latest", false]` or an explicit hexadecimal height and `false`, and `debug_traceBlockByNumber` with the `callTracer` configuration. Other parameter variants continue through the Route. [Endpoint-free RPC](https://rpc.aurpay.net/docs/endpoint-free-rpc.md) lists the exact forms and cache behavior.

## Verify the network

```bash
curl '<base_access_point>' \
  -H 'Authorization: Bearer <app_api_key>' \
  -H 'Content-Type: application/json' \
  --data '{"jsonrpc":"2.0","id":1,"method":"eth_chainId","params":[]}'
```

Mainnet returns `0x2105`; Sepolia returns `0x14a34`.

## Coverage boundary

One JSON-RPC 2.0 object per HTTP `POST`. Base-specific methods, trace output, and historical state follow the upstream node and plan.

See [Endpoints](https://rpc.aurpay.net/docs/endpoints.md) for lifecycle management and [Errors and recovery](https://rpc.aurpay.net/docs/errors.md) for Gateway error codes.