# Optimism

**Canonical:** https://apis.io/providers/optimism/  
**Website:** https://www.optimism.io  
**APIs profiled:** 10

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.

## Kin Score — 38.1 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 38.1).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 63.0 |
| Governance | 13.6 |
| Contract Governance | 13.6 |
| Operational Transparency | 26.3 |
| Developer Ergonomics | 16.7 |
| Commercial Clarity | 28.9 |
| Access Clarity | 28.9 |

## Agent readiness — 27.8 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | derived |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Free — onboarding: unknown, pricing: free, trial: no (confidence: medium).

## APIs (10)

- **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.

## Agentic access (1)

- **Optimism Agentic Access** — 1 operation · 1 acting

## Security (1)

- **Optimism Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Plans (1)

- **Optimism Plans Pricing**

## Tags

Layer 2, Ethereum, OP Stack, Superchain, JSON-RPC, Rollup, Bridge

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/optimism/). Scores are computed from the provider's own public artifacts under a published rubric.