# Optimism Etherscan

**Canonical:** https://apis.io/providers/optimistic-etherscan/  
**Website:** https://optimistic.etherscan.io/  
**APIs profiled:** 7

Optimism Etherscan is the official blockchain explorer and API platform for the Optimism L2 network (OP Mainnet, chain ID 10). It provides REST APIs for querying Optimism transactions, token events, smart contract source code, account balances, block data, and OP Mainnet statistics. API subscriptions have migrated to Etherscan API V2, enabling a single API key to access Optimism alongside 60+ EVM chains. The free tier covers select chains with 3 calls/second and 100,000 calls/day; paid plans start at $49/month for full multichain access.

## Kin Score — 49.1 / 100 (developing)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 49.1).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 61.9 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 31.6 |
| Developer Ergonomics | 33.3 |
| Commercial Clarity | 73.7 |
| Access Clarity | 73.7 |

## Agent readiness — 28.7 (agent-ready)

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

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (7)

- **Optimism Etherscan Accounts API** — Address balances, transaction lists, and token holdings on OP Mainnet
- **Optimism Etherscan Blocks API** — Block rewards, countdowns, and block-to-timestamp lookups
- **Optimism Etherscan Contracts API** — Smart contract source code, ABI, creation info, and verification
- **Optimism Etherscan Geth Proxy API** — Ethereum JSON-RPC proxy for direct node-level queries
- **Optimism Etherscan Stats API** — OP Mainnet network statistics, OP token supply, and gas oracle
- **Optimism Etherscan Tokens API** — ERC-20 and ERC-721 token balances, supply, and holder lists
- **Optimism Etherscan Transactions API** — Transaction execution status, receipts, and internal transactions

## Agentic access (1)

- **Optimistic Etherscan Agentic Access** — 1 operation

## Security (3)

- **Optimistic Etherscan Authentication** — apiKey · 1 scheme
- **Optimistic Etherscan Domain Security** — TLSv1.3 · DNSSEC · DMARC
- **Optimistic Etherscan Vulnerability Disclosure** — disclosure policy published

## Plans (1)

- **Optimistic Etherscan Plans Pricing**

## Tags

Blockchain, Optimism, Layer 2, Ethereum, EVM, Web3, Cryptocurrency

---

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