---
title: "Optimism API"
description: "Optimism Core RPC API over HTTPS and WSS"
url: "https://blockreq.com/docs/build/api-reference/optimism/"
---

# Optimism API

Optimism endpoints use the EVM JSON-RPC Core API. The route keeps Optimism's EVM method surface separate from non-EVM protocols.

## Endpoint

| Item | Value |
| --- | --- |
| Network | Optimism Mainnet |
| Protocol | EVM JSON-RPC 2.0 |
| Chain ID | `10` (`0xa`) |
| Public HTTPS | `https://optimism-rpc.blockreq.com/v1/rpc/public` |
| Private HTTPS | `https://optimism-rpc.blockreq.com/v1/rpc/BRQ1P0000000000000000000000000000000000000000000000000000000` |
| WSS | `wss://optimism-rpc.blockreq.com/v1/rpc/BRQ1P0000000000000000000000000000000000000000000000000000000` when enabled |

## Core Methods

Optimism supports the shared [EVM JSON-RPC Methods](https://blockreq.com/docs/build/api-reference/evm-methods/index.md) set for core reads, transactions, filters, subscriptions, and archive state.

| Capability | Methods |
| --- | --- |
| Latest state | `eth_chainId`, `eth_blockNumber`, `eth_call`, `eth_getBalance` |
| Historical state | old-block `eth_call`, `eth_getStorageAt`, `eth_getTransactionCount` |
| History/index | `eth_getLogs`, `eth_getTransactionByHash`, `eth_getTransactionReceipt` |

## Proof, Debug, and Trace

BlockReq does not currently document or guarantee `eth_getProof`, `debug_*`, or `trace_*` on Optimism.