Optimism

aid: optimism
url: https://raw.githubusercontent.com/api-evangelist/optimism/refs/heads/main/apis.yml
name: Optimism
kind: company
description: >-
  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.
image: https://kinlane-productions.s3.amazonaws.com/apis-json/apis-json-logo.jpg
tags:
  - Layer 2
  - Ethereum
  - OP Stack
  - Superchain
  - JSON-RPC
  - Rollup
  - Bridge
created: '2026-05-23'
modified: '2026-05-23'
specificationVersion: '0.19'
apis:
  - aid: optimism:mainnet-rpc
    name: OP Mainnet JSON-RPC
    description: >-
      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 proving. Public endpoint is rate-limited and does not
      provide WebSockets; production teams front it with Alchemy, QuickNode, Infura,
      or self-hosted op-geth + op-node.
    humanURL: https://docs.optimism.io/superchain/networks
    baseURL: https://mainnet.optimism.io
    tags:
      - JSON-RPC
      - Mainnet
      - OP Mainnet
    properties:
      - type: Documentation
        url: https://docs.optimism.io/superchain/networks
  - aid: optimism:sepolia-rpc
    name: OP Sepolia JSON-RPC
    description: >-
      Public Ethereum JSON-RPC endpoint for the OP Sepolia testnet (chain ID
      11155420) used for development and integration testing.
    humanURL: https://docs.optimism.io/superchain/networks
    baseURL: https://sepolia.optimism.io
    tags:
      - JSON-RPC
      - Testnet
      - Sepolia
    properties:
      - type: Documentation
        url: https://docs.optimism.io/superchain/networks
  - aid: optimism:bridge
    name: Optimism Bridge (Standard Bridge)
    description: >-
      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 as a hosted app and via the Superbridge / Brid.gg interfaces
      for the full Superchain.
    humanURL: https://app.optimism.io/bridge
    baseURL: https://app.optimism.io/bridge
    tags:
      - Bridge
      - Cross-Chain
      - Canonical
    properties:
      - type: Documentation
        url: https://docs.optimism.io/app-developers/bridging/standard-bridge
      - type: App
        url: https://app.optimism.io/bridge
  - aid: optimism:op-stack
    name: OP Stack
    description: >-
      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, op-challenger, op-deployer, op-validator,
      and fault-proof system used to launch and operate Superchain rollups.
    humanURL: https://stack.optimism.io
    baseURL: https://github.com/ethereum-optimism/optimism
    tags:
      - OP Stack
      - Rollup
      - Open Source
    properties:
      - type: Documentation
        url: https://docs.optimism.io/stack/getting-started
      - type: Repository
        url: https://github.com/ethereum-optimism/optimism
      - type: Specs
        url: https://specs.optimism.io
  - aid: optimism:superchain-registry
    name: Superchain Registry
    description: >-
      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 form.
    humanURL: https://github.com/ethereum-optimism/superchain-registry
    baseURL: https://github.com/ethereum-optimism/superchain-registry
    tags:
      - Superchain
      - Registry
      - Metadata
    properties:
      - type: Repository
        url: https://github.com/ethereum-optimism/superchain-registry
  - aid: optimism:viem-sdk
    name: Optimism SDK (Viem extension)
    description: >-
      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.
    humanURL: https://docs.optimism.io/app-developers/tutorials/bridging/cross-dom-solidity
    baseURL: https://viem.sh/op-stack
    tags:
      - SDK
      - TypeScript
      - Viem
      - Cross-Chain
    properties:
      - type: Documentation
        url: https://viem.sh/op-stack
  - aid: optimism:supersim
    name: Supersim
    description: >-
      Local Superchain simulator that spins up multiple OP Stack chains for
      developing and testing cross-chain interop messages (CrossL2Inbox /
      L2ToL2CrossDomainMessenger) before mainnet rollout.
    humanURL: https://docs.optimism.io/stack/interop/tools/supersim
    baseURL: https://github.com/ethereum-optimism/supersim
    tags:
      - Supersim
      - Interop
      - Local Dev
    properties:
      - type: Repository
        url: https://github.com/ethereum-optimism/supersim
  - aid: optimism:etherscan-explorer
    name: Optimism Etherscan
    description: >-
      Etherscan-family block explorer for OP Mainnet and OP Sepolia with REST API
      access for contracts, transactions, and addresses.
    humanURL: https://optimistic.etherscan.io
    baseURL: https://api-optimistic.etherscan.io/api
    tags:
      - Block Explorer
      - Etherscan
      - API
    properties:
      - type: Documentation
        url: https://docs.optimism.etherscan.io
      - type: Website
        url: https://optimistic.etherscan.io
  - aid: optimism:blockscout-explorer
    name: Optimism Blockscout
    description: >-
      Open-source Blockscout block explorer for OP Mainnet with REST and GraphQL
      APIs.
    humanURL: https://optimism.blockscout.com
    baseURL: https://optimism.blockscout.com/api
    tags:
      - Block Explorer
      - Blockscout
      - API
    properties:
      - type: Website
        url: https://optimism.blockscout.com
common:
  - type: Website
    url: https://www.optimism.io
  - type: Documentation
    url: https://docs.optimism.io
  - type: GitHub
    url: https://github.com/ethereum-optimism
  - type: Specs
    url: https://specs.optimism.io
  - type: SuperchainRegistry
    url: https://github.com/ethereum-optimism/superchain-registry
  - type: Governance
    url: https://gov.optimism.io
  - type: Status
    url: https://status.optimism.io
  - type: Twitter
    url: https://x.com/Optimism
  - type: Discord
    url: https://discord.gg/optimism
  - type: Blog
    url: https://blog.oplabs.co
integrations:
  - name: Ethereum
  - name: Base
  - name: Mode
  - name: Zora
  - name: Worldchain
  - name: Alchemy
  - name: QuickNode
  - name: Infura
  - name: The Graph
  - name: Etherscan
maintainers:
  - FN: Kin Lane
    email: [email protected]