Optimism website screenshot

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.

Optimism publishes 3 APIs on the APIs.io network: OP Mainnet JSON-RPC, OP Sepolia JSON-RPC, and JSON-RPC API. Tagged areas include Layer 2, Ethereum, OP Stack, Superchain, and JSON-RPC.

The Optimism catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Optimism’s developer surface includes documentation, GitHub presence, status page, engineering blog, and 15 more developer resources.

🌐 Visit website 📡 Source on GitHub
45.6/100 developing ▬ flat Agent 23/100 agent aware self hosted · MIT Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0
AccessFree
1 APIs
Layer 2EthereumOP StackSuperchainJSON-RPCRollupBridge

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0
Composite quality — 45.6/100 · developing
Contract Quality 12.1 / 20
Developer Ergonomics 2.7 / 16
Access Clarity 4.6 / 16
Operational Transparency 5.5 / 10
Contract Governance 1.3 / 10
Discoverability 6.1 / 8
Open Source Surface 10.0 / 10
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 23/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 6 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 0 / 5
Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.
The six quality facets above are damped to 80 points between them, because the conditional facet above carries the other 20. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 80% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/optimism: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 10

Individual APIs this provider publishes, each with its own machine-readable definition.

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.

Optimism JSON-RPC API

Standard Ethereum JSON-RPC method invocation.

Scroll for all 10

Open Collections 3

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

OP Mainnet JSON-RPC API

OPEN COLLECTION

OP Mainnet JSON-RPC

OPEN COLLECTION

GraphQL 1

GraphQL schemas published by this provider.

Optimism GraphQL API

GRAPHQL

Pricing Plans 1

Published pricing tiers and plan structures.

Optimism Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Optimism Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Optimism Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

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

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Optimism API Rules

7 rules · 1 errors 5 warnings 1 info

SPECTRAL

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Optimism Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Optimism Agentic Access

1 operation · 1 acting

1 operations · 1 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

SuperchainRegistry
SuperchainRegistry

Documentation 2

Reference material describing how the API behaves

ContributionGuide
ContributionGuide
 Documentation
Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 LlmsText
LlmsText

Build 2

SDKs, sample code, and the tooling you integrate with

CodeOfConduct
CodeOfConduct
 GitHub
GitHub

Access & Security 2

Authentication, authorization, and security posture

SecurityPolicy
SecurityPolicy
 DomainSecurity
DomainSecurity

Operate 4

Status, limits, changes, and where to get help

IssueTracker
IssueTracker
 Releases
Releases
 Status
Status
 Discord
Discord

Commercial 1

Pricing, plans, and the legal terms of use

License
License

Company 3

The organization behind the API

Website
Website
 Twitter
Twitter
 Blog
Blog

Other 2

Properties that don't map to a standard resource type

Specs
Specs
 Governance
Governance

Source (apis.yml)

apis.yml Raw ↑ 
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.
deliveryModel:
  model: self-hosted
  license: MIT
  open_source: true
  commercial: false
  callable_host: true
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Free
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/optimism.png
tags:
- Layer 2
- Ethereum
- OP Stack
- Superchain
- JSON-RPC
- Rollup
- Bridge
created: '2026-05-23'
modified: '2026-05-29'
specificationVersion: '0.23'
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
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/optimism/refs/heads/main/asyncapi/optimism-asyncapi.yml
  - url: graphql/optimism-graphql.md
    type: GraphQL
- 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
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/optimism/refs/heads/main/asyncapi/optimism-asyncapi.yml
- 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
  tags_raw:
  - 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
  tags_raw:
  - 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
  tags_raw:
  - 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
  tags_raw:
  - Block Explorer
  - Blockscout
  - API
  properties:
  - type: Website
    url: https://optimism.blockscout.com
- aid: optimism:optimism-json-rpc-api
  name: Optimism JSON-RPC API
  description: Standard Ethereum JSON-RPC method invocation.
  humanURL: https://docs.optimism.io/superchain/networks
  baseURL: https://mainnet.optimism.io
  tags:
  - JSON-RPC
  properties:
  - type: OpenAPI
    url: openapi/optimism-json-rpc-api-openapi.yml
common:
- type: IssueTracker
  url: https://github.com/ethereum-optimism/optimism/issues
- type: Releases
  url: https://github.com/ethereum-optimism/optimism/releases
- type: SecurityPolicy
  url: https://github.com/ethereum-optimism/optimism/blob/develop/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/ethereum-optimism/.github/blob/master/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/ethereum-optimism/optimism/blob/develop/CONTRIBUTING.md
- type: License
  name: MIT
  url: https://github.com/ethereum-optimism/optimism/blob/develop/LICENSE
- type: AgenticAccess
  url: agentic-access/optimism-agentic-access.yml
- type: DomainSecurity
  url: security/optimism-domain-security.yml
- 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
- type: LlmsText
  url: https://docs.optimism.io/llms.txt
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: kin@apievangelist.com

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this
  • find_providersBrowse and filter every provider in the catalog.
  • get_provider_artifactsEvery artifact this provider publishes, grouped by type.
  • get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
  • get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
  • get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
  • get_provider_ratingPRO — composite, band, trend and facet scores.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This provider 
curl "https://apis.io/api/v1/providers/optimism"
All providers 
curl "https://apis.io/api/v1/providers?limit=25"
Every operation they expose 
curl "https://apis.io/api/v1/providers/optimism/operations?limit=25"
How their score was established 
curl "https://apis.io/api/v1/providers/optimism/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.