Arbitrum

Arbitrum is the Ethereum Layer 2 rollup ecosystem from Offchain Labs. It includes Arbitrum One (general-purpose rollup secured by Ethereum), Arbitrum Nova (AnyTrust chain for high-throughput, low-cost apps), Arbitrum Sepolia (testnet), and Arbitrum Orbit (settlement framework for custom L2 / L3 chains). Developers interact via standard Ethereum JSON-RPC, the Stylus SDK for Rust / C / C++ smart contracts, the Arbitrum SDK for cross-chain messaging and bridging, and the Arbitrum Bridge for canonical asset transfer between Ethereum and Arbitrum chains.

Arbitrum publishes 4 APIs on the APIs.io network, including One JSON-RPC, Nova JSON-RPC, Sepolia JSON-RPC, and 1 more. Tagged areas include Layer 2, Ethereum, Rollup, JSON-RPC, and Stylus.

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

Arbitrum’s developer surface includes documentation, GitHub presence, developer portal, status page, engineering blog, and 11 more developer resources.

🌐 Visit website 📡 Source on GitHub

38.6/100 thin ▬ flat Agent 23/100 agent aware self hosted · Apache-2.0 Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFree

1 APIs

Layer 2 Ethereum Rollup JSON-RPC StylusNitroOrbit Bridge

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 38.6/100 · thin

Contract Quality 12.1 / 20

Developer Ergonomics 4.2 / 16

Access Clarity 4.6 / 16

Operational Transparency 4.4 / 10

Contract Governance 1.3 / 10

Discoverability 6.1 / 8

Open Source Surface 2.5 / 10

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 23/100 · 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

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 80 points between them, because the conditional facet above carries the other 20. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 80% 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/arbitrum: 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.

Arbitrum One JSON-RPC

Public Ethereum JSON-RPC endpoint for Arbitrum One mainnet (chain ID 42161), the flagship optimistic rollup secured directly by Ethereum L1. Supports standard eth_* methods plus...

Arbitrum Nova JSON-RPC

Public Ethereum JSON-RPC endpoint for Arbitrum Nova (chain ID 42170), an AnyTrust chain with a Data Availability Committee for high-throughput, low-cost transactions suited to g...

Arbitrum Sepolia JSON-RPC

Public Ethereum JSON-RPC endpoint for the Arbitrum Sepolia testnet (chain ID 421614).

Arbitrum Bridge

Canonical cross-chain bridge for transferring ETH and ERC-20 tokens between Ethereum L1, Arbitrum One, Arbitrum Nova, and connected Orbit chains. Bridge operations and underlyin...

Arbitrum SDK

Official TypeScript SDK (@arbitrum/sdk) for cross-chain interactions — building L1-to-L2 and L2-to-L1 messages, deposit and withdrawal flows, retryable tickets, and gas estimati...

Stylus SDK (Rust)

Stylus lets developers write EVM-compatible smart contracts in Rust, C, and C++ that compile to WASM and run alongside Solidity contracts. The Rust SDK provides storage primitiv...

Arbitrum Nitro

Open-source Nitro node implementation that runs Arbitrum One, Nova, and Orbit chains. Includes the sequencer, batch poster, validator, and a fork of go- ethereum patched for Arb...

Arbitrum Orbit SDK

TypeScript SDK and tooling for deploying and operating Orbit chains — custom Arbitrum L2 / L3 chains that settle to Arbitrum One, Nova, or other Orbit chains.

Arbiscan Block Explorer

Etherscan-family block explorer for Arbitrum One, Nova, and Sepolia with a public REST API for contracts, transactions, and addresses.

Arbitrum JSON-RPC API

Ethereum-compatible JSON-RPC 2.0 endpoint

Scroll for all 10

Open Collections 3

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

API Collection

OPEN COLLECTION

Arbitrum JSON-RPC API

OPEN COLLECTION

Arbitrum JSON-RPC API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Arbitrum Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Arbitrum Rate Limits

2 limits

RATE LIMITS

FinOps 1

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

Arbitrum Finops

FINOPS

Event Specifications 1

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

Arbitrum Public WebSocket APIs

AsyncAPI description of the WebSocket surface that Arbitrum exposes from publicly documented endpoints. ## Important scope notes (from Arbitrum docs) Arbitrum's public RPC endpo...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Arbitrum API Rules

7 rules · 1 errors 5 warnings 1 info

SPECTRAL

Security Posture 1

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

Arbitrum Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

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

Arbitrum Agentic Access

1 operation · 1 acting

1 operations · 1 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

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 1

SDKs, sample code, and the tooling you integrate with

GitHub

GitHub

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

IssueTracker

Releases

Status

Discord

Commercial 1

Pricing, plans, and the legal terms of use

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

Foundation

Foundation

Bridge

Bridge

Source (apis.yml)

aid: arbitrum
url: https://raw.githubusercontent.com/api-evangelist/arbitrum/refs/heads/main/apis.yml
name: Arbitrum
kind: company
description: Arbitrum is the Ethereum Layer 2 rollup ecosystem from Offchain Labs. It includes Arbitrum One (general-purpose
  rollup secured by Ethereum), Arbitrum Nova (AnyTrust chain for high-throughput, low-cost apps), Arbitrum Sepolia (testnet),
  and Arbitrum Orbit (settlement framework for custom L2 / L3 chains). Developers interact via standard Ethereum JSON-RPC,
  the Stylus SDK for Rust / C / C++ smart contracts, the Arbitrum SDK for cross-chain messaging and bridging, and the Arbitrum
  Bridge for canonical asset transfer between Ethereum and Arbitrum chains.
deliveryModel:
  model: self-hosted
  license: Apache-2.0
  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: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/arbitrum.png
tags:
- Layer 2
- Ethereum
- Rollup
- JSON-RPC
- Stylus
- Nitro
- Orbit
- Bridge
created: '2026-05-23'
modified: '2026-05-29'
specificationVersion: '0.23'
apis:
- aid: arbitrum:one-rpc
  name: Arbitrum One JSON-RPC
  description: Public Ethereum JSON-RPC endpoint for Arbitrum One mainnet (chain ID 42161), the flagship optimistic rollup
    secured directly by Ethereum L1. Supports standard eth_* methods plus Arbitrum-specific precompiles for L1 messaging,
    retryable tickets, and gas accounting. Public endpoint does not support WebSockets — production teams use Alchemy, QuickNode,
    Infura, Chainstack, or self-hosted Nitro nodes.
  humanURL: https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers
  baseURL: https://arb1.arbitrum.io/rpc
  tags:
  - JSON-RPC
  - Mainnet
  - Arbitrum One
  properties:
  - type: Documentation
    url: https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/arbitrum/refs/heads/main/asyncapi/arbitrum-asyncapi.yml
- aid: arbitrum:nova-rpc
  name: Arbitrum Nova JSON-RPC
  description: Public Ethereum JSON-RPC endpoint for Arbitrum Nova (chain ID 42170), an AnyTrust chain with a Data Availability
    Committee for high-throughput, low-cost transactions suited to gaming and social apps.
  humanURL: https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers
  baseURL: https://nova.arbitrum.io/rpc
  tags:
  - JSON-RPC
  - Nova
  - AnyTrust
  properties:
  - type: Documentation
    url: https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/arbitrum/refs/heads/main/asyncapi/arbitrum-asyncapi.yml
- aid: arbitrum:sepolia-rpc
  name: Arbitrum Sepolia JSON-RPC
  description: Public Ethereum JSON-RPC endpoint for the Arbitrum Sepolia testnet (chain ID 421614).
  humanURL: https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers
  baseURL: https://sepolia-rollup.arbitrum.io/rpc
  tags:
  - JSON-RPC
  - Testnet
  - Sepolia
  properties:
  - type: Documentation
    url: https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/arbitrum/refs/heads/main/asyncapi/arbitrum-asyncapi.yml
- aid: arbitrum:bridge
  name: Arbitrum Bridge
  description: Canonical cross-chain bridge for transferring ETH and ERC-20 tokens between Ethereum L1, Arbitrum One, Arbitrum
    Nova, and connected Orbit chains. Bridge operations and underlying token-bridge contracts are open-source.
  humanURL: https://bridge.arbitrum.io
  baseURL: https://bridge.arbitrum.io
  tags:
  - Bridge
  - Cross-Chain
  - Canonical
  properties:
  - type: Documentation
    url: https://docs.arbitrum.io/arbitrum-bridge/quickstart
  - type: App
    url: https://bridge.arbitrum.io
  - type: Repository
    url: https://github.com/OffchainLabs/token-bridge-contracts
- aid: arbitrum:sdk
  name: Arbitrum SDK
  description: Official TypeScript SDK (@arbitrum/sdk) for cross-chain interactions — building L1-to-L2 and L2-to-L1 messages,
    deposit and withdrawal flows, retryable tickets, and gas estimation for Arbitrum chains.
  humanURL: https://docs.arbitrum.io/sdk
  baseURL: https://github.com/OffchainLabs/arbitrum-sdk
  tags:
  - SDK
  - TypeScript
  - Cross-Chain
  properties:
  - type: Documentation
    url: https://docs.arbitrum.io/sdk
  - type: Repository
    url: https://github.com/OffchainLabs/arbitrum-sdk
- aid: arbitrum:stylus-sdk
  name: Stylus SDK (Rust)
  description: Stylus lets developers write EVM-compatible smart contracts in Rust, C, and C++ that compile to WASM and run
    alongside Solidity contracts. The Rust SDK provides storage primitives, host I/O, and macros for ABI compatibility.
  humanURL: https://docs.arbitrum.io/stylus/gentle-introduction
  baseURL: https://github.com/OffchainLabs/stylus-sdk-rs
  tags:
  - Stylus
  - SDK
  - Rust
  - Wasm
  tags_raw:
  - Stylus
  - SDK
  - Rust
  - WASM
  properties:
  - type: Documentation
    url: https://docs.arbitrum.io/stylus/gentle-introduction
  - type: Repository
    url: https://github.com/OffchainLabs/stylus-sdk-rs
- aid: arbitrum:nitro
  name: Arbitrum Nitro
  description: Open-source Nitro node implementation that runs Arbitrum One, Nova, and Orbit chains. Includes the sequencer,
    batch poster, validator, and a fork of go- ethereum patched for Arbitrum's execution layer.
  humanURL: https://docs.arbitrum.io/how-arbitrum-works/inside-arbitrum-nitro
  baseURL: https://github.com/OffchainLabs/nitro
  tags:
  - Node
  - Nitro
  - Sequencer
  - Validator
  properties:
  - type: Documentation
    url: https://docs.arbitrum.io/how-arbitrum-works/inside-arbitrum-nitro
  - type: Repository
    url: https://github.com/OffchainLabs/nitro
- aid: arbitrum:orbit-sdk
  name: Arbitrum Orbit SDK
  description: TypeScript SDK and tooling for deploying and operating Orbit chains — custom Arbitrum L2 / L3 chains that settle
    to Arbitrum One, Nova, or other Orbit chains.
  humanURL: https://docs.arbitrum.io/launch-orbit-chain/orbit-gentle-introduction
  baseURL: https://github.com/OffchainLabs/arbitrum-orbit-sdk
  tags:
  - Orbit
  - SDK
  - Appchains
  properties:
  - type: Documentation
    url: https://docs.arbitrum.io/launch-orbit-chain/orbit-gentle-introduction
  - type: Repository
    url: https://github.com/OffchainLabs/arbitrum-orbit-sdk
- aid: arbitrum:arbiscan-explorer
  name: Arbiscan Block Explorer
  description: Etherscan-family block explorer for Arbitrum One, Nova, and Sepolia with a public REST API for contracts, transactions,
    and addresses.
  humanURL: https://arbiscan.io
  baseURL: https://api.arbiscan.io/api
  tags:
  - Block Explorer
  - Arbiscan
  tags_raw:
  - Block Explorer
  - Arbiscan
  - API
  properties:
  - type: Documentation
    url: https://docs.arbiscan.io
  - type: Website
    url: https://arbiscan.io
- aid: arbitrum:arbitrum-json-rpc-api
  name: Arbitrum JSON-RPC API
  description: Ethereum-compatible JSON-RPC 2.0 endpoint
  humanURL: https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers
  baseURL: https://arb1.arbitrum.io/rpc
  tags:
  - JSON-RPC
  properties:
  - type: OpenAPI
    url: openapi/arbitrum-json-rpc-api-openapi.yml
common:
- type: IssueTracker
  url: https://github.com/OffchainLabs/token-bridge-contracts/issues
- type: Releases
  url: https://github.com/OffchainLabs/token-bridge-contracts/releases
- type: License
  name: Apache-2.0
  url: https://github.com/OffchainLabs/token-bridge-contracts/blob/main/LICENSE
- type: AgenticAccess
  url: agentic-access/arbitrum-agentic-access.yml
- type: DomainSecurity
  url: security/arbitrum-domain-security.yml
- type: Website
  url: https://arbitrum.io
- type: Foundation
  url: https://arbitrum.foundation
- type: Documentation
  url: https://docs.arbitrum.io
- type: GitHub
  url: https://github.com/OffchainLabs
- type: Portal
  url: https://portal.arbitrum.io
- type: Bridge
  url: https://bridge.arbitrum.io
- type: Status
  url: https://status.arbitrum.io
- type: Twitter
  url: https://x.com/arbitrum
- type: Discord
  url: https://discord.gg/arbitrum
- type: Blog
  url: https://medium.com/offchainlabs
- type: LlmsText
  url: https://docs.arbitrum.io/llms.txt
integrations:
- name: Ethereum
- name: Alchemy
- name: QuickNode
- name: Infura
- name: Chainstack
- name: The Graph
- name: Etherscan
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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