Optimism

Optimism is an Ethereum Layer 2 scaling network and the originator of the OP Stack — an open-source, modular rollup framework that powers OP Mainnet and a growing Superchain of interoperable chains (Base, Mode, Zora, Worldchain, and others). Developers interact via standard Ethereum JSON-RPC, the Optimism (Viem-based) SDK, the canonical Optimism Bridge, OP Stack operator tooling (op-geth, op-node, op-deployer, op-batcher, op-proposer, op-challenger), and the Superchain Registry.

9 APIs 0 Features

Layer 2EthereumOP StackSuperchainJSON-RPCRollupBridge

APIs

OP Mainnet JSON-RPC

Public Ethereum JSON-RPC endpoint for OP Mainnet (chain ID 10). Supports standard eth_* methods plus Optimism extensions for L1 fee estimation, deposit tracking, and withdrawal ...

OP Sepolia JSON-RPC

Public Ethereum JSON-RPC endpoint for the OP Sepolia testnet (chain ID 11155420) used for development and integration testing.

Optimism Bridge (Standard Bridge)

Canonical cross-chain bridge for depositing and withdrawing ETH and ERC-20 tokens between Ethereum L1 and OP Mainnet, secured by the OP Stack StandardBridge contracts. Available...

OP Stack

Open-source, modular Ethereum L2 rollup stack. The monorepo at github.com/ethereum-optimism/optimism contains op-geth (execution), op-node (consensus), op-batcher, op-proposer, ...

Superchain Registry

Source-of-truth index of chains that are part of the Optimism Superchain — genesis files, deployment addresses, RPC endpoints, explorers, and chain metadata in machine-readable ...

Optimism SDK (Viem extension)

Modern Optimism SDK exposed as a Viem extension (viem/op-stack) for L1<->L2 message tracking, deposit and withdrawal flows, fee estimation, and Superchain multi-chain helpers.

Supersim

Local Superchain simulator that spins up multiple OP Stack chains for developing and testing cross-chain interop messages (CrossL2Inbox / L2ToL2CrossDomainMessenger) before main...

Optimism Etherscan

Etherscan-family block explorer for OP Mainnet and OP Sepolia with REST API access for contracts, transactions, and addresses.

Optimism Blockscout

Open-source Blockscout block explorer for OP Mainnet with REST and GraphQL APIs.

Collections

OP Mainnet JSON-RPC

OPEN

GraphQL

Optimism GraphQL API

GRAPHQL

Pricing Plans

Optimism Plans Pricing

1 plans

PLANS

Rate Limits

Optimism Rate Limits

2 limits

RATE LIMITS

FinOps

Optimism Finops

FINOPS

Event Specifications

Optimism (OP Stack) WebSocket JSON-RPC API

AsyncAPI 2.6 description of the WebSocket JSON-RPC subscription surface exposed by op-geth — the OP Stack execution client used by OP Mainnet (chain ID 10) and OP Sepolia (chain...

ASYNCAPI

Resources

SuperchainRegistry

Sources

opencollection: 1.0.0
info:
  name: OP Mainnet JSON-RPC
  version: 1.0.0
items:
- info:
    name: JSON-RPC
    type: folder
  items:
  - info:
      name: Invoke a JSON-RPC method
      type: http
    http:
      method: POST
      url: https://mainnet.optimism.io/
      body:
        type: json
        data: '{}'
    docs: 'Execute any supported Ethereum JSON-RPC method (e.g. `eth_blockNumber`,

      `eth_chainId`, `eth_getBalance`, `eth_call`, `eth_getTransactionByHash`,

      `eth_getLogs`, `net_version`, `web3_clientVersion`).

      '
bundled: true