Optimism Etherscan

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.

Optimism Etherscan publishes 1 API on the APIs.io network: Accounts API. Tagged areas include Blockchain, Optimism, Layer 2, Ethereum, and EVM.

The Optimism Etherscan catalog on APIs.io includes 1 JSON-LD context.

Optimism Etherscan’s developer surface includes authentication, developer portal, documentation, pricing, signup flow, sandbox, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

50.4/100 developing ▬ flat Agent 29/100 agent ready saas Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs

Blockchain Optimism Layer 2 Ethereum EVM Web3 Cryptocurrency

Kin Score

Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0

Composite quality — 50.4/100 · developing

Contract Quality 15.5 / 25

Developer Ergonomics 6.7 / 20

Access Clarity 14.7 / 20

Operational Transparency 4.1 / 13

Contract Governance 1.8 / 12

Discoverability 7.6 / 10

Agent readiness — 29/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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/optimistic-etherscan: 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 1

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

Optimism Etherscan Accounts API

Address balances, transaction lists, and token holdings on OP Mainnet

Open Collections 8

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

API Collection

OPEN COLLECTION

Optimism Etherscan Accounts API

OPEN COLLECTION

Optimism Etherscan Accounts Blocks API

OPEN COLLECTION

Optimism Etherscan Accounts Contracts API

OPEN COLLECTION

Optimism Etherscan Accounts Geth Proxy API

OPEN COLLECTION

Optimism Etherscan Accounts Stats API

OPEN COLLECTION

Optimism Etherscan Accounts Tokens API

OPEN COLLECTION

Optimism Etherscan Accounts Transactions API

OPEN COLLECTION

Scroll for all 8

Pricing Plans 1

Published pricing tiers and plan structures.

Optimistic Etherscan Plans Pricing

7 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Optimistic Etherscan Rate Limits

13 limits

RATE LIMITS

FinOps 1

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

Optimistic Etherscan Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Optimistic Etherscan Context

0 classes · 39 properties

JSON-LD

Security Posture 3

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

Optimistic Etherscan Authentication

apiKey · 1 scheme

SECURITY

Optimistic Etherscan Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Optimistic Etherscan Vulnerability Disclosure

disclosure policy published

SECURITY

Agentic Access 1

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

Optimistic Etherscan Agentic Access

1 operation

1 operations · 0 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

Portal

Portal

Signup

Signup

Sandbox

Sandbox

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LlmsText

LlmsText

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: optimistic-etherscan
name: Optimism Etherscan
description: 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.
url: https://raw.githubusercontent.com/api-evangelist/optimistic-etherscan/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/optimistic-etherscan.png
type: Index
position: Consuming
access: 3rd-Party
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
tags:
- Blockchain
- Optimism
- Layer 2
- Ethereum
- EVM
- Web3
- Cryptocurrency
apis:
- aid: optimistic-etherscan:optimistic-etherscan-accounts-api
  name: Optimism Etherscan Accounts API
  description: Address balances, transaction lists, and token holdings on OP Mainnet
  humanURL: https://docs.optimism.etherscan.io/
  baseURL: https://api-optimistic.etherscan.io/api
  tags:
  - Account
  tags_raw:
  - Accounts
  properties:
  - type: OpenAPI
    url: openapi/optimistic-etherscan-accounts-api-openapi.yml
  - type: Documentation
    url: https://docs.optimism.etherscan.io/
  - type: Documentation
    url: https://docs.optimism.etherscan.io/api-endpoints/accounts
  - type: Documentation
    url: https://docs.optimism.etherscan.io/api-endpoints/contracts
  - type: Documentation
    url: https://docs.optimism.etherscan.io/api-endpoints/stats
  - type: Documentation
    url: https://docs.optimism.etherscan.io/api-endpoints/stats-1
  - type: Documentation
    url: https://docs.optimism.etherscan.io/api-endpoints/tokens
  - type: Documentation
    url: https://docs.optimism.etherscan.io/api-endpoints/blocks
  - type: Documentation
    url: https://docs.optimism.etherscan.io/api-endpoints/geth-parity-proxy
  - type: Documentation
    url: https://docs.optimism.etherscan.io/api-pro/api-pro-endpoints
  - type: Pricing
    url: https://etherscan.io/apis
  - type: Signup
    url: https://optimistic.etherscan.io/myapikey
  - type: TermsOfService
    url: https://etherscan.io/apiterms
  - type: RateLimits
    url: https://docs.optimism.etherscan.io/support/rate-limits
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/optimistic-etherscan/refs/heads/main/vocabulary/optimistic-etherscan-vocabulary.yml
  - type: JSONLDContext
    url: https://raw.githubusercontent.com/api-evangelist/optimistic-etherscan/refs/heads/main/json-ld/optimistic-etherscan-context.jsonld
common:
- type: Website
  url: https://www.etherscan.io/
- type: AgenticAccess
  url: agentic-access/optimistic-etherscan-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/optimistic-etherscan-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/optimistic-etherscan-domain-security.yml
- type: Authentication
  url: authentication/optimistic-etherscan-authentication.yml
- url: https://optimistic.etherscan.io/
  type: Portal
- url: https://docs.optimism.etherscan.io/
  type: Documentation
- url: https://etherscan.io/apis
  type: Pricing
- url: https://etherscan.io/apiterms
  type: TermsOfService
- url: https://optimistic.etherscan.io/myapikey
  type: Signup
- url: https://docs.optimism.etherscan.io/support/rate-limits
  type: RateLimits
- url: https://docs.etherscan.io/llms.txt
  type: LlmsText
- url: https://docs.optimism.etherscan.io/optimism-sepolia-etherscan
  type: Sandbox
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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