Starknet

Starknet is a permissionless Ethereum Layer 2 validity rollup developed by StarkWare, powered by STARK proofs and the Cairo smart contract language. Developers interact with Starknet via a versioned Starknet JSON-RPC (served by Pathfinder, Juno, and Papyrus full nodes as well as Infura / Alchemy / Blast / Nethermind providers), the Cairo toolchain (Scarb, Starknet Foundry, Cairo compiler, cairo-vm), client SDKs (starknet.js, starknet.py, starknet-rs), the StarkGate canonical bridge between Ethereum and Starknet, and Voyager / Starkscan block explorers.

Starknet publishes 13 API contracts indexed on the APIs.io network, including JSON-RPC Specification, JSON RPC API, and 11 more. Tagged areas include Layer 2, Ethereum, Validity Rollup, ZK, and Cairo.

The Starknet catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Starknet’s developer surface includes documentation, engineering blog, and 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

25.9/100 emerging ▬ flat Agent 22/100 agent aware Front door AI 1/6 silent Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFree

1 published contract

Layer 2 EthereumValidity RollupZKCairoSTARKJSON-RPC Bridge Starknet Real-Time

Kin Score

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

Composite quality — 25.9/100 · emerging

Contract Quality 9.5 / 19

Developer Ergonomics 2.1 / 15

Access Clarity 0.8 / 15

Operational Transparency 2.6 / 10

Contract Governance 1.0 / 9

Discoverability 5.0 / 8

Regulatory Posture 0.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 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 6 / 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 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/.

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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
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

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 50.8 — up to +12.3 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/starknet/apis.yml: open an issue on github.com/api-evangelist/starknet 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 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

OpenAPI

measured — observed by APIs.io (published)

AsyncAPI

measured — observed by APIs.io (published)

APIs 13

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

Starknet JSON-RPC Specification

Versioned JSON-RPC specification implemented by Starknet full nodes (Pathfinder, Juno, Papyrus) and infrastructure providers. Defines read methods (starknet_* for blocks, transa...

Starknet Mainnet RPC (Public Providers)

Starknet Mainnet (chain ID SN_MAIN) is reached via the Starknet JSON-RPC at hosted providers — Infura, Alchemy, Blast, Nethermind Voyager, Lava, Chainstack — or via self-hosted ...

Starknet Sepolia RPC (Public Providers)

Public JSON-RPC endpoint for Starknet Sepolia testnet (chain ID SN_SEPOLIA) for development and integration testing.

StarkGate Bridge

Canonical L1L2 bridge for ETH and ERC-20 tokens between Ethereum and Starknet, operated by StarkWare. Bridge contracts are open-source.

starknet.js SDK

JavaScript / TypeScript SDK for Starknet — providers, accounts, contract classes, ABI parsing, transaction signing, and integration with browser wallets via the wallet API (get-...

starknet.py SDK

Python SDK for Starknet maintained by Software Mansion, covering account / contract interaction, Cairo ABI handling, and the Starknet JSON-RPC.

starknet-rs SDK

Rust SDK for Starknet with high-performance providers, accounts, contract bindings, ABI codegen, and Cairo serialization.

Cairo Language

Cairo is StarkWare's Turing-complete language for creating provable programs and the canonical smart contract language for Starknet. Distributed as the Cairo compiler (Rust) and...

Pathfinder Full Node

Rust implementation of a Starknet full node from Equilibrium that serves the Starknet JSON-RPC, syncs from Ethereum L1 data, and verifies state transitions.

Juno Full Node

Go implementation of a Starknet full node from Nethermind that serves the Starknet JSON-RPC and acts as a sequencer / RPC backend.

Voyager Block Explorer

Nethermind-built block explorer for Starknet Mainnet and Sepolia with a public REST API for blocks, transactions, contracts, classes, events, and tokens.

Starkscan Block Explorer

Block explorer for Starknet Mainnet, Sepolia, and Sepolia Integration with a public REST API for blocks, transactions, events, classes, and NFTs.

Starknet JSON RPC API

The Starknet JSON RPC API API from Starknet — 1 operation(s) for starknet json rpc api.

Scroll for all 13

Open Collections 2

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

Starknet JSON-RPC Starknet JSON RPC API API

OPEN COLLECTION

Starknet JSON-RPC API

OPEN COLLECTION

Starknet API pricing

Not yet checked against Starknet'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 Starknet's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Starknet Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Starknet 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.

Starknet

SLA

FinOps 1

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

Starknet Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Starknet WebSocket RPC API

AsyncAPI 2.6 description of the Starknet WebSocket JSON-RPC API as defined by the upstream `starknet_ws_api.json` OpenRPC specification (https://github.com/starkware-libs/starkn...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Starknet — asyncapi rules

7 rules · 1 errors 6 warnings

SPECTRAL

Security Posture 1

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

Starknet Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

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

Starknet 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 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubStarkWare

GitHubStarkWare

GitHubStarknet

GitHubStarknet

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 5

Status, limits, changes, and where to get help

RateLimits

IssueTracker

Releases

Community

Discord

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

Twitter

Twitter

Blog

Blog

Other 4

Properties that don't map to a standard resource type

Foundation

Foundation

Specs

Specs

Bridge

Bridge

Telegram

Source (apis.yml)

aid: starknet
url: https://raw.githubusercontent.com/api-evangelist/starknet/refs/heads/main/apis.yml
name: Starknet
kind: company
description: Starknet is a permissionless Ethereum Layer 2 validity rollup developed by StarkWare, powered by STARK proofs
  and the Cairo smart contract language. Developers interact with Starknet via a versioned Starknet JSON-RPC (served by Pathfinder,
  Juno, and Papyrus full nodes as well as Infura / Alchemy / Blast / Nethermind providers), the Cairo toolchain (Scarb, Starknet
  Foundry, Cairo compiler, cairo-vm), client SDKs (starknet.js, starknet.py, starknet-rs), the StarkGate canonical bridge
  between Ethereum and Starknet, and Voyager / Starkscan block explorers.
deliveryModel:
  model: unknown
  license_evidence:
    not_product:
    - eqlabs/pathfinder
    - nethermindeth/juno
    - software-mansion/starknet.py
    - starknet-io/starkgate-contracts
    - starknet-io/starknet.js
  open_source: unknown
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  - repository-not-product
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: free
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Free
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/starknet.png
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
x-docs-hosting: vercel
tags:
- Layer 2
- Ethereum
- Validity Rollup
- ZK
- Cairo
- STARK
- JSON-RPC
- Bridge
- Starknet
- Real-Time
created: '2026-05-23'
modified: '2026-09-16'
specificationVersion: '0.23'
apis:
- aid: starknet:json-rpc
  name: Starknet JSON-RPC Specification
  description: Versioned JSON-RPC specification implemented by Starknet full nodes (Pathfinder, Juno, Papyrus) and infrastructure
    providers. Defines read methods (starknet_* for blocks, transactions, classes, state, storage, events), trace methods,
    and write methods for invoking, deploying accounts, and declaring classes.
  humanURL: https://github.com/starkware-libs/starknet-specs
  baseURL: https://github.com/starkware-libs/starknet-specs
  tags:
  - JSON-RPC
  - Spec
  - OpenRPC
  properties:
  - type: Documentation
    url: https://github.com/starkware-libs/starknet-specs
  - type: Repository
    url: https://github.com/starkware-libs/starknet-specs
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/starknet/refs/heads/main/asyncapi/starknet-asyncapi.yml
- aid: starknet:mainnet-rpc
  name: Starknet Mainnet RPC (Public Providers)
  description: Starknet Mainnet (chain ID SN_MAIN) is reached via the Starknet JSON-RPC at hosted providers — Infura, Alchemy,
    Blast, Nethermind Voyager, Lava, Chainstack — or via self-hosted Pathfinder / Juno full nodes.
  humanURL: https://docs.starknet.io/quick-start/environment-setup
  baseURL: https://starknet-mainnet.public.blastapi.io
  tags:
  - JSON-RPC
  - Mainnet
  - Providers
  properties:
  - type: Documentation
    url: https://docs.starknet.io/quick-start/environment-setup
- aid: starknet:sepolia-rpc
  name: Starknet Sepolia RPC (Public Providers)
  description: Public JSON-RPC endpoint for Starknet Sepolia testnet (chain ID SN_SEPOLIA) for development and integration
    testing.
  humanURL: https://docs.starknet.io/quick-start/environment-setup
  baseURL: https://starknet-sepolia.public.blastapi.io
  tags:
  - JSON-RPC
  - Testnet
  - Sepolia
  properties:
  - type: Documentation
    url: https://docs.starknet.io/quick-start/environment-setup
- aid: starknet:starkgate-bridge
  name: StarkGate Bridge
  description: Canonical L1<->L2 bridge for ETH and ERC-20 tokens between Ethereum and Starknet, operated by StarkWare. Bridge
    contracts are open-source.
  humanURL: https://starkgate.starknet.io
  baseURL: https://starkgate.starknet.io
  tags:
  - Bridge
  - Cross-Chain
  - Canonical
  properties:
  - type: Documentation
    url: https://docs.starknet.io/quick-start/bridging-tokens
  - type: App
    url: https://starkgate.starknet.io
  - type: Repository
    url: https://github.com/starknet-io/starkgate-contracts
- aid: starknet:starknet-js
  name: starknet.js SDK
  description: JavaScript / TypeScript SDK for Starknet — providers, accounts, contract classes, ABI parsing, transaction
    signing, and integration with browser wallets via the wallet API (get-starknet).
  humanURL: https://www.starknetjs.com
  baseURL: https://github.com/starknet-io/starknet.js
  tags:
  - SDK
  - JavaScript
  - TypeScript
  properties:
  - type: Documentation
    url: https://www.starknetjs.com
  - type: Repository
    url: https://github.com/starknet-io/starknet.js
- aid: starknet:starknet-py
  name: starknet.py SDK
  description: Python SDK for Starknet maintained by Software Mansion, covering account / contract interaction, Cairo ABI
    handling, and the Starknet JSON-RPC.
  humanURL: https://starknetpy.readthedocs.io
  baseURL: https://github.com/software-mansion/starknet.py
  tags:
  - SDK
  - Python
  properties:
  - type: Documentation
    url: https://starknetpy.readthedocs.io
  - type: Repository
    url: https://github.com/software-mansion/starknet.py
- aid: starknet:starknet-rs
  name: starknet-rs SDK
  description: Rust SDK for Starknet with high-performance providers, accounts, contract bindings, ABI codegen, and Cairo
    serialization.
  humanURL: https://github.com/xJonathanLEI/starknet-rs
  baseURL: https://github.com/xJonathanLEI/starknet-rs
  tags:
  - SDK
  - Rust
  properties:
  - type: Repository
    url: https://github.com/xJonathanLEI/starknet-rs
- aid: starknet:cairo
  name: Cairo Language
  description: Cairo is StarkWare's Turing-complete language for creating provable programs and the canonical smart contract
    language for Starknet. Distributed as the Cairo compiler (Rust) and the Scarb package manager.
  humanURL: https://book.cairo-lang.org
  baseURL: https://github.com/starkware-libs/cairo
  tags:
  - Cairo
  - Language
  - Smart Contracts
  properties:
  - type: Documentation
    url: https://book.cairo-lang.org
  - type: Repository
    url: https://github.com/starkware-libs/cairo
  - type: PackageManager
    url: https://docs.swmansion.com/scarb
- aid: starknet:pathfinder
  name: Pathfinder Full Node
  description: Rust implementation of a Starknet full node from Equilibrium that serves the Starknet JSON-RPC, syncs from
    Ethereum L1 data, and verifies state transitions.
  humanURL: https://github.com/eqlabs/pathfinder
  baseURL: https://github.com/eqlabs/pathfinder
  tags:
  - Node
  - JSON-RPC
  - Rust
  properties:
  - type: Repository
    url: https://github.com/eqlabs/pathfinder
- aid: starknet:juno
  name: Juno Full Node
  description: Go implementation of a Starknet full node from Nethermind that serves the Starknet JSON-RPC and acts as a sequencer
    / RPC backend.
  humanURL: https://github.com/NethermindEth/juno
  baseURL: https://github.com/NethermindEth/juno
  tags:
  - Node
  - JSON-RPC
  - Go
  properties:
  - type: Repository
    url: https://github.com/NethermindEth/juno
- aid: starknet:voyager-explorer
  name: Voyager Block Explorer
  description: Nethermind-built block explorer for Starknet Mainnet and Sepolia with a public REST API for blocks, transactions,
    contracts, classes, events, and tokens.
  humanURL: https://voyager.online
  baseURL: https://api.voyager.online/beta
  tags:
  - Block Explorer
  - Voyager
  tags_raw:
  - Block Explorer
  - Voyager
  - API
  properties:
  - type: Website
    url: https://voyager.online
- aid: starknet:starkscan-explorer
  name: Starkscan Block Explorer
  description: Block explorer for Starknet Mainnet, Sepolia, and Sepolia Integration with a public REST API for blocks, transactions,
    events, classes, and NFTs.
  humanURL: https://starkscan.co
  baseURL: https://api.starkscan.co/api
  tags:
  - Block Explorer
  - Starkscan
  tags_raw:
  - Block Explorer
  - Starkscan
  - API
  properties:
  - type: Website
    url: https://starkscan.co
- aid: starknet:starknet-starknet-json-rpc-api-api
  name: Starknet JSON RPC API
  description: The Starknet JSON RPC API API from Starknet — 1 operation(s) for starknet json rpc api.
  humanURL: https://github.com/starkware-libs/starknet-specs
  baseURL: https://github.com/starkware-libs/starknet-specs
  tags:
  - Starknet JSON RPC API
  properties:
  - type: OpenAPI
    url: openapi/starknet-starknet-json-rpc-api-api-openapi.yml
common:
- type: Plans
  url: plans/starknet-plans-pricing.yml
- type: RateLimits
  url: rate-limits/starknet-rate-limits.yml
- type: FinOps
  url: finops/starknet-finops.yml
- type: IssueTracker
  url: https://github.com/starkware-libs/starknet-specs/issues
- type: Releases
  url: https://github.com/starkware-libs/starknet-specs/releases
- type: AgenticAccess
  url: agentic-access/starknet-agentic-access.yml
- type: DomainSecurity
  url: security/starknet-domain-security.yml
- type: Website
  url: https://www.starknet.io
- type: Documentation
  url: https://docs.starknet.io
- type: Foundation
  url: https://www.starknet.io/foundation
- type: GitHubStarkWare
  url: https://github.com/starkware-libs
- type: GitHubStarknet
  url: https://github.com/starknet-io
- type: Specs
  url: https://github.com/starkware-libs/starknet-specs
- type: Bridge
  url: https://starkgate.starknet.io
- type: Community
  url: https://community.starknet.io
- type: Twitter
  url: https://x.com/Starknet
- type: Discord
  url: https://discord.gg/starknet-community
- type: Telegram
  url: https://t.me/sncorestars
- type: Blog
  url: https://www.starknet.io/blog
integrations:
- name: Ethereum
- name: Infura
- name: Alchemy
- name: Blast API
- name: Chainstack
- name: Nethermind
- name: Equilibrium
- name: Software Mansion
- name: The Graph
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Starknet API — frequently asked questions

Does Starknet have an API?

Yes. APIs.io lists 13 APIs from Starknet, including Starknet JSON-RPC Specification, Starknet Mainnet RPC (Public Providers) and Starknet Sepolia RPC (Public Providers), and 10 more.

Is there an OpenAPI specification for the Starknet API?

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

How much does the Starknet API cost?

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

Is the Starknet API ready for AI agents?

Starknet has a Kin Score of 25.9 out of 100 (emerging) and an Agent Readiness score of 21.5 (agent-aware), scored by API Evangelist on 2026-11-06.

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