Basescan

Base L2 blockchain explorer with a REST API for querying Base network transactions, token balances, smart contract ABIs, ERC-20 transfer events, gas prices, and block data. Powered by the Etherscan team and migrated to the unified Etherscan API V2 platform, enabling access to 50+ EVM chains with a single API key using chain ID 8453 for Base.

Basescan publishes 10 APIs on the APIs.io network, including Accounts API, API PRO Endpoints API, Blocks API, and 7 more. Tagged areas include Blockchain, Base, L2, Explorer, and Ethereum.

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

Basescan’s developer surface includes authentication, engineering blog, support, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

42.7/100 developing ▬ flat Agent 25/100 agent aware saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs

Blockchain Base L2 Explorer Ethereum EVM Transaction Tokens Smart Contracts

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 42.7/100 · developing

Contract Quality 9.8 / 19

Developer Ergonomics 2.9 / 15

Access Clarity 9.6 / 15

Operational Transparency 4.3 / 10

Contract Governance 0.0 / 9

Discoverability 5.0 / 8

Regulatory Posture 3.7 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 25/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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/basescan: 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 10

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

Basescan Accounts API

The Accounts API from Basescan — 12 operation(s) for accounts.

Basescan API PRO Endpoints API

The API PRO Endpoints API from Basescan — 20 operation(s) for api pro endpoints.

Basescan Blocks API

The Blocks API from Basescan — 8 operation(s) for blocks.

Basescan Contracts API

The Contracts API from Basescan — 5 operation(s) for contracts.

Basescan Gas Tracker API

The Gas Tracker API from Basescan — 5 operation(s) for gas tracker.

Basescan Geth/Parity Proxy API

The Geth/Parity Proxy API from Basescan — 14 operation(s) for geth/parity proxy.

Basescan Logs API

The Logs API from Basescan — 3 operation(s) for logs.

Basescan Stats API

The Stats API from Basescan — 13 operation(s) for stats.

Basescan Tokens API

The Tokens API from Basescan — 9 operation(s) for tokens.

Basescan Transactions API

The Transactions API from Basescan — 2 operation(s) for transactions.

Scroll for all 10

Open Collections 11

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

API Collection

OPEN COLLECTION

Basescan Accounts API

OPEN COLLECTION

Basescan Accounts API PRO Endpoints API

OPEN COLLECTION

Basescan Accounts Blocks API

OPEN COLLECTION

Basescan Accounts Contracts API

OPEN COLLECTION

Basescan Accounts Gas Tracker API

OPEN COLLECTION

Basescan Accounts Geth/Parity Proxy API

OPEN COLLECTION

Basescan Accounts Logs API

OPEN COLLECTION

Basescan Accounts Stats API

OPEN COLLECTION

Basescan Accounts Tokens API

OPEN COLLECTION

Basescan Accounts Transactions API

OPEN COLLECTION

Scroll for all 11

Pricing Plans 1

Published pricing tiers and plan structures.

Plans

7 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Rate Limits

7 limits

RATE LIMITS

FinOps 1

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

Finops

FINOPS

Semantic Vocabularies 1

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

Apis Io Context

0 classes · 0 properties

JSON-LD

Security Posture 2

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

Basescan Authentication

apiKey · 1 scheme

SECURITY

Basescan Domain Security

TLSv1.3 · HSTS · DNSSEC

SECURITY

Agentic Access 1

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

Basescan Agentic Access

71 operations · 1 acting

AGENTIC

Resources

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

name: Basescan
description: Base L2 blockchain explorer with a REST API for querying Base network transactions, token balances, smart contract
  ABIs, ERC-20 transfer events, gas prices, and block data. Powered by the Etherscan team and migrated to the unified Etherscan
  API V2 platform, enabling access to 50+ EVM chains with a single API key using chain ID 8453 for Base.
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: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://basescan.org/images/brandassets/basescan-logo-circle.png
tags:
- Blockchain
- Base
- L2
- Explorer
- Ethereum
- EVM
- Transaction
- Tokens
- Smart Contracts
tags_raw:
- blockchain
- Base
- L2
- explorer
- Ethereum
- EVM
- transactions
- tokens
- smart contracts
created: '2026-06-13'
modified: '2026-09-16'
url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/apis.yml
specificationVersion: '0.23'
apis:
- aid: basescan:basescan-accounts-api
  name: Basescan Accounts API
  description: The Accounts API from Basescan — 12 operation(s) for accounts.
  humanURL: https://docs.basescan.org
  baseURL: https://api.basescan.org/api
  tags:
  - Account
  tags_raw:
  - Accounts
  properties:
  - type: OpenAPI
    url: openapi/basescan-accounts-api-openapi.yml
  - type: Documentation
    url: https://docs.basescan.org
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/finops/finops.yml
  - type: Signup
    url: https://basescan.org/register
  - type: Login
    url: https://basescan.org/login
  - type: Keys
    url: https://basescan.org/myapikey
  - type: StatusPage
    url: https://etherscan.freshstatus.io
  - type: FAQ
    url: https://info.basescan.org
- aid: basescan:basescan-api-pro-endpoints-api
  name: Basescan API PRO Endpoints API
  description: The API PRO Endpoints API from Basescan — 20 operation(s) for api pro endpoints.
  humanURL: https://docs.basescan.org
  baseURL: https://api.basescan.org/api
  tags:
  - API PRO Endpoints
  properties:
  - type: OpenAPI
    url: openapi/basescan-api-pro-endpoints-api-openapi.yml
  - type: Documentation
    url: https://docs.basescan.org
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/finops/finops.yml
  - type: Signup
    url: https://basescan.org/register
  - type: Login
    url: https://basescan.org/login
  - type: Keys
    url: https://basescan.org/myapikey
  - type: StatusPage
    url: https://etherscan.freshstatus.io
  - type: FAQ
    url: https://info.basescan.org
- aid: basescan:basescan-blocks-api
  name: Basescan Blocks API
  description: The Blocks API from Basescan — 8 operation(s) for blocks.
  humanURL: https://docs.basescan.org
  baseURL: https://api.basescan.org/api
  tags:
  - Blocks
  properties:
  - type: OpenAPI
    url: openapi/basescan-blocks-api-openapi.yml
  - type: Documentation
    url: https://docs.basescan.org
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/finops/finops.yml
  - type: Signup
    url: https://basescan.org/register
  - type: Login
    url: https://basescan.org/login
  - type: Keys
    url: https://basescan.org/myapikey
  - type: StatusPage
    url: https://etherscan.freshstatus.io
  - type: FAQ
    url: https://info.basescan.org
- aid: basescan:basescan-contracts-api
  name: Basescan Contracts API
  description: The Contracts API from Basescan — 5 operation(s) for contracts.
  humanURL: https://docs.basescan.org
  baseURL: https://api.basescan.org/api
  tags:
  - Contracts
  properties:
  - type: OpenAPI
    url: openapi/basescan-contracts-api-openapi.yml
  - type: Documentation
    url: https://docs.basescan.org
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/finops/finops.yml
  - type: Signup
    url: https://basescan.org/register
  - type: Login
    url: https://basescan.org/login
  - type: Keys
    url: https://basescan.org/myapikey
  - type: StatusPage
    url: https://etherscan.freshstatus.io
  - type: FAQ
    url: https://info.basescan.org
- aid: basescan:basescan-gas-tracker-api
  name: Basescan Gas Tracker API
  description: The Gas Tracker API from Basescan — 5 operation(s) for gas tracker.
  humanURL: https://docs.basescan.org
  baseURL: https://api.basescan.org/api
  tags:
  - Gas Tracker
  properties:
  - type: OpenAPI
    url: openapi/basescan-gas-tracker-api-openapi.yml
  - type: Documentation
    url: https://docs.basescan.org
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/finops/finops.yml
  - type: Signup
    url: https://basescan.org/register
  - type: Login
    url: https://basescan.org/login
  - type: Keys
    url: https://basescan.org/myapikey
  - type: StatusPage
    url: https://etherscan.freshstatus.io
  - type: FAQ
    url: https://info.basescan.org
- aid: basescan:basescan-geth-parity-proxy-api
  name: Basescan Geth/Parity Proxy API
  description: The Geth/Parity Proxy API from Basescan — 14 operation(s) for geth/parity proxy.
  humanURL: https://docs.basescan.org
  baseURL: https://api.basescan.org/api
  tags:
  - Geth/Parity Proxy
  properties:
  - type: OpenAPI
    url: openapi/basescan-geth-parity-proxy-api-openapi.yml
  - type: Documentation
    url: https://docs.basescan.org
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/finops/finops.yml
  - type: Signup
    url: https://basescan.org/register
  - type: Login
    url: https://basescan.org/login
  - type: Keys
    url: https://basescan.org/myapikey
  - type: StatusPage
    url: https://etherscan.freshstatus.io
  - type: FAQ
    url: https://info.basescan.org
- aid: basescan:basescan-logs-api
  name: Basescan Logs API
  description: The Logs API from Basescan — 3 operation(s) for logs.
  humanURL: https://docs.basescan.org
  baseURL: https://api.basescan.org/api
  tags:
  - Logs
  properties:
  - type: OpenAPI
    url: openapi/basescan-logs-api-openapi.yml
  - type: Documentation
    url: https://docs.basescan.org
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/finops/finops.yml
  - type: Signup
    url: https://basescan.org/register
  - type: Login
    url: https://basescan.org/login
  - type: Keys
    url: https://basescan.org/myapikey
  - type: StatusPage
    url: https://etherscan.freshstatus.io
  - type: FAQ
    url: https://info.basescan.org
- aid: basescan:basescan-stats-api
  name: Basescan Stats API
  description: The Stats API from Basescan — 13 operation(s) for stats.
  humanURL: https://docs.basescan.org
  baseURL: https://api.basescan.org/api
  tags:
  - Stats
  properties:
  - type: OpenAPI
    url: openapi/basescan-stats-api-openapi.yml
  - type: Documentation
    url: https://docs.basescan.org
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/finops/finops.yml
  - type: Signup
    url: https://basescan.org/register
  - type: Login
    url: https://basescan.org/login
  - type: Keys
    url: https://basescan.org/myapikey
  - type: StatusPage
    url: https://etherscan.freshstatus.io
  - type: FAQ
    url: https://info.basescan.org
- aid: basescan:basescan-tokens-api
  name: Basescan Tokens API
  description: The Tokens API from Basescan — 9 operation(s) for tokens.
  humanURL: https://docs.basescan.org
  baseURL: https://api.basescan.org/api
  tags:
  - Tokens
  properties:
  - type: OpenAPI
    url: openapi/basescan-tokens-api-openapi.yml
  - type: Documentation
    url: https://docs.basescan.org
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/finops/finops.yml
  - type: Signup
    url: https://basescan.org/register
  - type: Login
    url: https://basescan.org/login
  - type: Keys
    url: https://basescan.org/myapikey
  - type: StatusPage
    url: https://etherscan.freshstatus.io
  - type: FAQ
    url: https://info.basescan.org
- aid: basescan:basescan-transactions-api
  name: Basescan Transactions API
  description: The Transactions API from Basescan — 2 operation(s) for transactions.
  humanURL: https://docs.basescan.org
  baseURL: https://api.basescan.org/api
  tags:
  - Transaction
  tags_raw:
  - Transactions
  properties:
  - type: OpenAPI
    url: openapi/basescan-transactions-api-openapi.yml
  - type: Documentation
    url: https://docs.basescan.org
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/basescan/refs/heads/main/finops/finops.yml
  - type: Signup
    url: https://basescan.org/register
  - type: Login
    url: https://basescan.org/login
  - type: Keys
    url: https://basescan.org/myapikey
  - type: StatusPage
    url: https://etherscan.freshstatus.io
  - type: FAQ
    url: https://info.basescan.org
common:
- type: Website
  url: https://basescan.org
- type: AgenticAccess
  url: agentic-access/basescan-agentic-access.yml
- type: DomainSecurity
  url: security/basescan-domain-security.yml
- type: Authentication
  url: authentication/basescan-authentication.yml
- type: Authentication
  url: https://basescan.org/myapikey
- type: Plans
  url: https://etherscan.io/apis?id=8453
- type: PrivacyPolicy
  url: https://etherscan.io/privacyPolicy
- type: TermsOfService
  url: https://etherscan.io/terms
- type: Blog
  url: https://info.basescan.org
- type: Support
  url: https://info.basescan.org
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-parent: etherscan
x-relationship: product

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