Base

Base is Coinbase's Ethereum Layer 2 network built on the OP Stack and part of the Optimism Superchain. It exposes a standard Ethereum JSON-RPC interface for smart contracts and dApps, plus higher-level developer surfaces including Base Account (Smart Wallet, Sub Accounts, passkeys, paymaster-sponsored transactions), OnchainKit React components, Mini Apps, the canonical Bridge to Ethereum, and a Solana cross- chain bridge. Block exploration is available through BaseScan and Blockscout.

Base publishes 10 API contracts indexed on the APIs.io network, including JSON-RPC API, and 9 more. Tagged areas include Layer 2, Ethereum, OP Stack, Superchain, and JSON-RPC.

The Base catalog on APIs.io includes 1 Spectral governance ruleset.

Base’s developer surface includes documentation, GitHub presence, status page, engineering blog, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

25.4/100 emerging ▬ flat Agent 32/100 agent ready Heartbeat 100/100 alive self hosted · MIT Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFree

1 published contract 1 MCP Servers

Layer 2 Ethereum OP StackSuperchainJSON-RPC Smart Wallet Bridge Base

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 25.4/100 · emerging

Contract Quality 8.1 / 16

Developer Ergonomics 1.9 / 13

Access Clarity 0.7 / 13

Operational Transparency 2.0 / 8

Contract Governance 1.1 / 8

Discoverability 4.9 / 7

Regulatory Posture 0.8 / 15

Open Source Surface 2.5 / 10

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 32/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Payments 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.

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against 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 65 points between them, because both conditional facets apply and carry 35 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 65% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/base-l2/"><img src="https://apis.io/badge/base-l2/card.svg" alt="Base on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

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

Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
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)

8 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 5.3 — up to +18.9 composite points
Developer Ergonomics scores 14.3 — up to +17.1 composite points
Contract Quality scores 49.6 — up to +12.6 composite points

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.

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/base-l2/apis.yml: open an issue on github.com/api-evangelist/base-l2 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Agent Skills (SKILL.md packages)	undeclared	-	-	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 4

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.

The Ethereum JSON-RPC Interface

prose — states compatibility; nothing published to check it against

22 core of 78 operations graded · api-commons/blockchain

JSON RPC

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

Model Context Protocol (MCP)

measured — observed by APIs.io (verified)

OpenAPI

measured — observed by APIs.io (published)

APIs 10

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

Base Mainnet JSON-RPC

Standard Ethereum JSON-RPC endpoint for Base Mainnet (chain ID 8453). Supports eth_*, net_*, web3_*, and Optimism-specific extensions for fee estimation and L1 messaging. The pu...

Base Sepolia JSON-RPC

Public JSON-RPC endpoint for the Base Sepolia testnet (chain ID 84532) used for development, contract deployment, and integration testing.

Base Flashblocks RPC

Pre-confirmation JSON-RPC endpoint exposing Flashblocks — sub-block streams of ordered transactions that allow apps to react to pending state with sub-second latency.

Base Bridge

Canonical cross-chain bridge between Ethereum L1 and Base L2 for depositing and withdrawing ETH and ERC-20 tokens, secured by the OP Stack bridge contracts.

Base / Solana Bridge

Cross-chain bridge enabling asset transfers between Base and Solana, integrated into the Base ecosystem app surface.

Base Account / Smart Wallet

Base Account (formerly Coinbase Smart Wallet) is an ERC-4337 smart contract wallet with passkey sign-in, sub-accounts, session keys, sponsored transactions via paymaster, and SD...

OnchainKit

React component library and TypeScript SDK (@coinbase/onchainkit) for building onchain apps on Base — wallet, identity, transaction, swap, checkout, fund, and NFT components wit...

BaseScan Block Explorer

Etherscan-family block explorer for Base Mainnet and Sepolia with a public contract / transaction / address API.

Base Blockscout Block Explorer

Blockscout-powered open-source block explorer for Base with REST and GraphQL APIs.

Base JSON-RPC API

Ethereum JSON-RPC 2.0 endpoint

Scroll for all 10

Open Collections 2

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

Base JSON-RPC API

OPEN COLLECTION

Base JSON-RPC API

OPEN COLLECTION

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Base MCP Server

Remote MCP server at docs.base.org over HTTP; 3 tools listed.

MCP SERVER

Base API pricing

Not yet checked against Base's own pricing page. Compiled by API Evangelist on 2026-05-22; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Pro Tier Default: 120 requests per minute

Compiled by API Evangelist, not yet checked against Base's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Base L2 Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Base L2 Rate Limits

2 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Base

SLA

FinOps 1

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

Base L2 Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Base API Rules

43 rules · 41 errors 1 warnings 1 info

SPECTRAL

Security Posture 1

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

Base L2 Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

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

Base L2 Agentic Access

1 operation · 1 acting

1 operations · 1 acting

AGENTIC

Resources

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

Build 2

SDKs, sample code, and the tooling you integrate with

GitHub

GitHub

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 5

Status, limits, changes, and where to get help

RateLimits

IssueTracker

Releases

Status

Discord

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

License

License

Company 3

The organization behind the API

Website

Website

Twitter

Twitter

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Bridge

Bridge

Ecosystem

Ecosystem

Source (apis.yml)

aid: base-l2
url: https://raw.githubusercontent.com/api-evangelist/base-l2/refs/heads/main/apis.yml
name: Base
kind: company
description: Base is Coinbase's Ethereum Layer 2 network built on the OP Stack and part of the Optimism Superchain. It exposes
  a standard Ethereum JSON-RPC interface for smart contracts and dApps, plus higher-level developer surfaces including Base
  Account (Smart Wallet, Sub Accounts, passkeys, paymaster-sponsored transactions), OnchainKit React components, Mini Apps,
  the canonical Bridge to Ethereum, and a Solana cross- chain bridge. Block exploration is available through BaseScan and
  Blockscout.
deliveryModel:
  model: self-hosted
  license: MIT
  open_source: true
  commercial: false
  callable_host: true
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Free
  confidence: low
  source:
  - plans
  - security
  - url: https://www.smartwallet.dev
    status: 308
    note: declared website redirects to https://www.base.org/ — a different registrable domain (smartwallet.dev -> base.org),
      possible rename or acquisition (probed 2026-09-03, roadmap#169)
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/base-l2.png
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-09-20
x-docs-hosting: vercel
tags:
- Layer 2
- Ethereum
- OP Stack
- Superchain
- JSON-RPC
- Smart Wallet
- Bridge
- Base
created: '2026-05-23'
modified: '2026-05-23'
specificationVersion: '0.23'
apis:
- aid: base-l2:mainnet-rpc
  name: Base Mainnet JSON-RPC
  description: Standard Ethereum JSON-RPC endpoint for Base Mainnet (chain ID 8453). Supports eth_*, net_*, web3_*, and Optimism-specific
    extensions for fee estimation and L1 messaging. The public endpoint is rate-limited and not recommended for production;
    teams typically front it with Alchemy, QuickNode, Infura, Coinbase Developer Platform, or self-hosted op-geth + op-node.
  humanURL: https://docs.base.org/chain/network-information
  baseURL: https://mainnet.base.org
  tags:
  - JSON-RPC
  - Mainnet
  - EVM
  properties:
  - type: Documentation
    url: https://docs.base.org/chain/network-information
- aid: base-l2:sepolia-rpc
  name: Base Sepolia JSON-RPC
  description: Public JSON-RPC endpoint for the Base Sepolia testnet (chain ID 84532) used for development, contract deployment,
    and integration testing.
  humanURL: https://docs.base.org/chain/network-information
  baseURL: https://sepolia.base.org
  tags:
  - JSON-RPC
  - Testnet
  - Sepolia
  properties:
  - type: Documentation
    url: https://docs.base.org/chain/network-information
- aid: base-l2:flashblocks-rpc
  name: Base Flashblocks RPC
  description: Pre-confirmation JSON-RPC endpoint exposing Flashblocks — sub-block streams of ordered transactions that allow
    apps to react to pending state with sub-second latency.
  humanURL: https://docs.base.org/chain/flashblocks
  baseURL: https://mainnet-preconf.base.org
  tags:
  - Flashblocks
  - Pre-Confirmation
  - JSON-RPC
  properties:
  - type: Documentation
    url: https://docs.base.org/chain/flashblocks
- aid: base-l2:bridge
  name: Base Bridge
  description: Canonical cross-chain bridge between Ethereum L1 and Base L2 for depositing and withdrawing ETH and ERC-20
    tokens, secured by the OP Stack bridge contracts.
  humanURL: https://bridge.base.org
  baseURL: https://bridge.base.org
  tags:
  - Bridge
  - L1
  - Layer 2
  - Canonical
  tags_raw:
  - Bridge
  - L1
  - L2
  - Canonical
  properties:
  - type: Documentation
    url: https://docs.base.org/chain/bridges-mainnet
  - type: App
    url: https://bridge.base.org
- aid: base-l2:solana-bridge
  name: Base / Solana Bridge
  description: Cross-chain bridge enabling asset transfers between Base and Solana, integrated into the Base ecosystem app
    surface.
  humanURL: https://docs.base.org/chain/base-solana-bridge
  baseURL: https://docs.base.org/chain/base-solana-bridge
  tags:
  - Bridge
  - Solana
  - Cross-Chain
  properties:
  - type: Documentation
    url: https://docs.base.org/chain/base-solana-bridge
- aid: base-l2:account
  name: Base Account / Smart Wallet
  description: Base Account (formerly Coinbase Smart Wallet) is an ERC-4337 smart contract wallet with passkey sign-in, sub-accounts,
    session keys, sponsored transactions via paymaster, and SDK + React component integrations.
  humanURL: https://docs.base.org/base-account
  baseURL: https://docs.base.org/base-account
  tags:
  - Smart Wallet
  - Account Abstraction
  - ERC-4337
  - Passkeys
  properties:
  - type: Documentation
    url: https://docs.base.org/base-account
  - type: Website
    url: https://www.smartwallet.dev
- aid: base-l2:onchainkit
  name: OnchainKit
  description: React component library and TypeScript SDK (@coinbase/onchainkit) for building onchain apps on Base — wallet,
    identity, transaction, swap, checkout, fund, and NFT components with built-in Smart Wallet and Mini App support.
  humanURL: https://docs.base.org/onchainkit
  baseURL: https://www.npmjs.com/package/@coinbase/onchainkit
  tags:
  - SDK
  - React
  - Components
  - Onchain
  properties:
  - type: Documentation
    url: https://docs.base.org/onchainkit
  - type: Repository
    url: https://github.com/coinbase/onchainkit
- aid: base-l2:basescan-explorer
  name: BaseScan Block Explorer
  description: Etherscan-family block explorer for Base Mainnet and Sepolia with a public contract / transaction / address
    API.
  humanURL: https://basescan.org
  baseURL: https://api.basescan.org/api
  tags:
  - Block Explorer
  - BaseScan
  tags_raw:
  - Block Explorer
  - API
  - BaseScan
  properties:
  - type: Documentation
    url: https://docs.basescan.org
  - type: Website
    url: https://basescan.org
- aid: base-l2:blockscout-explorer
  name: Base Blockscout Block Explorer
  description: Blockscout-powered open-source block explorer for Base with REST and GraphQL APIs.
  humanURL: https://base.blockscout.com
  baseURL: https://base.blockscout.com/api
  tags:
  - Block Explorer
  - Blockscout
  tags_raw:
  - Block Explorer
  - Blockscout
  - API
  properties:
  - type: Website
    url: https://base.blockscout.com
- aid: base-l2:base-l2-json-rpc-api
  name: Base JSON-RPC API
  description: Ethereum JSON-RPC 2.0 endpoint
  humanURL: https://docs.base.org/chain/network-information
  baseURL: https://mainnet.base.org
  tags:
  - JSON-RPC
  properties:
  - type: OpenAPI
    url: openapi/base-l2-json-rpc-api-openapi.yml
common:
- type: Plans
  url: plans/base-l2-plans-pricing.yml
- type: RateLimits
  url: rate-limits/base-l2-rate-limits.yml
- type: FinOps
  url: finops/base-l2-finops.yml
- type: IssueTracker
  url: https://github.com/coinbase/onchainkit/issues
- type: Releases
  url: https://github.com/coinbase/onchainkit/releases
- type: License
  name: MIT
  url: https://github.com/coinbase/onchainkit/blob/main/LICENSE
- type: AgenticAccess
  url: agentic-access/base-l2-agentic-access.yml
- type: DomainSecurity
  url: security/base-l2-domain-security.yml
- type: Website
  url: https://www.base.org
- type: Documentation
  url: https://docs.base.org
- type: GitHub
  url: https://github.com/base-org
- type: GitHubOrganization
  url: https://github.com/base
- type: Status
  url: https://status.base.org
- type: Bridge
  url: https://bridge.base.org
- type: Ecosystem
  url: https://www.base.org/ecosystem
- type: Twitter
  url: https://x.com/base
- type: Discord
  url: https://discord.gg/buildonbase
- type: Blog
  url: https://base.mirror.xyz
- type: LlmsText
  url: https://docs.base.org/llms.txt
integrations:
- name: Ethereum
- name: Optimism Superchain
- name: OP Stack
- name: Coinbase
- name: Solana (bridge)
- name: Alchemy
- name: QuickNode
- name: Infura
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Base API — frequently asked questions

Does Base have an API?

Yes. APIs.io lists 10 APIs from Base, including Base Mainnet JSON-RPC, Base Sepolia JSON-RPC and Base Flashblocks RPC, and 7 more.

Is there an OpenAPI specification for the Base API?

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

How much does the Base API cost?

APIs.io lists 1 pricing plan for Base, with each plan's price, limits and inclusions under Pricing on this page.

Does Base have an MCP server?

Yes. APIs.io lists 1 MCP server for Base: Remote MCP server at docs.base.org over HTTP; 3 tools listed.

Is the Base API ready for AI agents?

Base has a Kin Score of 25.4 out of 100 (emerging) and an Agent Readiness score of 32.0 (agent-ready), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/base-l2"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/base-l2/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/base-l2/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.