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 contract indexed 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 and 1 Spectral governance ruleset.

Optimism Etherscan’s developer surface includes authentication, developer portal, documentation, pricing, signup flow, sandbox, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

42.0/100 developing ▬ flat Agent 29/100 agent ready saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Blockchain Optimism Layer 2 Ethereum EVM Web3 Cryptocurrency

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 42.0/100 · developing

Contract Quality 12.0 / 21

Developer Ergonomics 5.7 / 17

Access Clarity 5.8 / 17

Operational Transparency 1.8 / 11

Contract Governance 2.8 / 10

Discoverability 6.2 / 9

Regulatory Posture 4.0 / 15

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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

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.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →

5 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 33.3 — up to +13.3 composite points Ask about this →
Access Clarity scores 34.0 — up to +13.2 composite points Ask about this →
Contract Quality scores 56.3 — up to +10.9 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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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 the provider profile at artifacts.apis.io/optimistic-etherscan/apis.yml: open an issue on github.com/api-evangelist/optimistic-etherscan to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

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 7

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

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 7

Optimism Etherscan API pricing

Not yet checked against Optimism Etherscan's own pricing page. Compiled by API Evangelist on 2026-06-13; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Lite paid	$49.00 per API Calls Per Day / day · Free
Standard paid	$199.00 per API Calls Per Day / day · Free
Advanced paid	$299.00 per API Calls Per Day / day · Free
Professional paid	$399.00 per API Calls Per Day / day · Free
Pro Plus paid	$899.00 per API Calls Per Day / day · Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Per-Second Rate: 3 requests per second
Free Tier Daily Quota: 100000 requests per day
Lite Tier Per-Second Rate: 5 requests per second

Compiled by API Evangelist, not yet checked against Optimism Etherscan's documentation. All 13 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Optimism Etherscan Plans Pricing

7 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Optimism Etherscan Rate Limits

13 limits

RATE LIMITS

FinOps 1

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

Optimism 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

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Optimism Etherscan API Rules

66 rules · 64 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 3

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

Optimism Etherscan Authentication

apiKey · 1 scheme

SECURITY

Optimism Etherscan Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Optimism Etherscan Vulnerability Disclosure

no policy recorded

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Optimism 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 4

Pricing, plans, and the legal terms of use

Plans

FinOps

Pricing

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
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  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: Plans
  url: plans/optimistic-etherscan-plans-pricing.yml
- type: FinOps
  url: finops/optimistic-etherscan-finops.yml
- type: Website
  url: https://optimistic.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
x-parent: etherscan
x-relationship: product

Optimism Etherscan API — frequently asked questions

Does Optimism Etherscan have an API?

Yes. APIs.io lists 1 API from Optimism Etherscan, including Optimism Etherscan Accounts API.

Is there an OpenAPI specification for the Optimism Etherscan API?

Yes. APIs.io indexes 1 OpenAPI specification for Optimism Etherscan, each linked for download from this page.

How do I authenticate with the Optimism Etherscan API?

Optimism Etherscan uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Optimism Etherscan Authentication.

How much does the Optimism Etherscan API cost?

APIs.io lists 7 pricing plans for Optimism Etherscan, with each plan's price, limits and inclusions under Pricing on this page.

Is the Optimism Etherscan API ready for AI agents?

Optimism Etherscan has a Kin Score of 42.0 out of 100 (developing) and an Agent Readiness score of 28.7 (agent-ready), scored by API Evangelist on 2026-11-13.

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