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 7 APIs on the APIs.io network, including Accounts API, Blocks API, Contracts API, and 4 more. 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 6 more developer resources.

🌐 Visit website 📡 Source on GitHub
48.2/100 developing ▬ flat Agent 37/100 agent ready Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
AccessFreemiumSelf serve⚡ Free to try
7 APIs
BlockchainOptimismLayer 2EthereumEVMWeb3Cryptocurrency

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 48.2/100 · developing
Contract Quality 17.6 / 25
Developer Ergonomics 7.0 / 20
Commercial Clarity 12.1 / 20
Operational Transparency 4.1 / 13
Governance 0.0 / 12
Discoverability 7.4 / 10
Agent readiness — 37/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 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 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. 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. Want it done for you? Prioritized profiling — $2,500 →

APIs 7

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

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

Scroll for all 7

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

Source (apis.yml)

apis.yml Raw ↑ 
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
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: Consumer
access: 3rd-Party
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.19'
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:
  - 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
- aid: optimistic-etherscan:optimistic-etherscan-blocks-api
  name: Optimism Etherscan Blocks API
  description: Block rewards, countdowns, and block-to-timestamp lookups
  humanURL: https://docs.optimism.etherscan.io/
  baseURL: https://api-optimistic.etherscan.io/api
  tags:
  - Blocks
  properties:
  - type: OpenAPI
    url: openapi/optimistic-etherscan-blocks-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
- aid: optimistic-etherscan:optimistic-etherscan-contracts-api
  name: Optimism Etherscan Contracts API
  description: Smart contract source code, ABI, creation info, and verification
  humanURL: https://docs.optimism.etherscan.io/
  baseURL: https://api-optimistic.etherscan.io/api
  tags:
  - Contracts
  properties:
  - type: OpenAPI
    url: openapi/optimistic-etherscan-contracts-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
- aid: optimistic-etherscan:optimistic-etherscan-geth-proxy-api
  name: Optimism Etherscan Geth Proxy API
  description: Ethereum JSON-RPC proxy for direct node-level queries
  humanURL: https://docs.optimism.etherscan.io/
  baseURL: https://api-optimistic.etherscan.io/api
  tags:
  - Geth Proxy
  properties:
  - type: OpenAPI
    url: openapi/optimistic-etherscan-geth-proxy-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
- aid: optimistic-etherscan:optimistic-etherscan-stats-api
  name: Optimism Etherscan Stats API
  description: OP Mainnet network statistics, OP token supply, and gas oracle
  humanURL: https://docs.optimism.etherscan.io/
  baseURL: https://api-optimistic.etherscan.io/api
  tags:
  - Stats
  properties:
  - type: OpenAPI
    url: openapi/optimistic-etherscan-stats-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
- aid: optimistic-etherscan:optimistic-etherscan-tokens-api
  name: Optimism Etherscan Tokens API
  description: ERC-20 and ERC-721 token balances, supply, and holder lists
  humanURL: https://docs.optimism.etherscan.io/
  baseURL: https://api-optimistic.etherscan.io/api
  tags:
  - Tokens
  properties:
  - type: OpenAPI
    url: openapi/optimistic-etherscan-tokens-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
- aid: optimistic-etherscan:optimistic-etherscan-transactions-api
  name: Optimism Etherscan Transactions API
  description: Transaction execution status, receipts, and internal transactions
  humanURL: https://docs.optimism.etherscan.io/
  baseURL: https://api-optimistic.etherscan.io/api
  tags:
  - Transactions
  properties:
  - type: OpenAPI
    url: openapi/optimistic-etherscan-transactions-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: 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