Offchain Labs

Offchain Labs (now operating as "Offchain") is the research-and-engineering company behind Arbitrum, one of the leading Ethereum Layer 2 scaling ecosystems, and Prysm, an Ethereum consensus client that powers a large share of the network. Its technology stack includes Arbitrum Nitro (the rollup node software), Arbitrum Stylus (a framework for writing smart contracts in Rust, C, and C++ compiled to WebAssembly), the Arbitrum Orbit / Arbitrum chains SDK for launching app-specific chains, and BoLD for permissionless dispute resolution. For developers the surface is Ethereum JSON-RPC endpoints for Arbitrum One, Nova, and Sepolia, plus first-party TypeScript, Rust, Go, and Solidity SDKs, the cargo-stylus CLI, and extensive documentation at docs.arbitrum.io.

Offchain Labs publishes 3 APIs on the APIs.io network. Tagged areas include Company, Blockchain, Ethereum, Layer 2, and Arbitrum.

Offchain Labs’ developer surface includes documentation, API reference, getting-started guide, engineering blog, CLI, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub
24.9/100 emerging ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5
3 APIs
CompanyBlockchainEthereumLayer 2ArbitrumScalingRollupSmart ContractsWeb3JSON-RPCInfrastructure

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 24.9/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 10.0 / 20
Commercial Clarity 4.2 / 20
Operational Transparency 0.7 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 0/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/offchain-labs: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 3

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

Arbitrum One JSON-RPC

Public Ethereum JSON-RPC endpoint for Arbitrum One (chain ID 42161), the flagship Arbitrum Layer 2 rollup. Supports the standard Ethereum JSON-RPC method set plus Arbitrum-speci...

Arbitrum Nova JSON-RPC

Public Ethereum JSON-RPC endpoint for Arbitrum Nova (chain ID 42170), the AnyTrust chain optimized for low-cost, high-throughput applications.

Arbitrum Sepolia JSON-RPC

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

Security Posture 1

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

Offchain Labs Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs
 CLI
CLI

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: offchain-labs
name: Offchain Labs
description: Offchain Labs (now operating as "Offchain") is the research-and-engineering company behind Arbitrum, one of the
  leading Ethereum Layer 2 scaling ecosystems, and Prysm, an Ethereum consensus client that powers a large share of the network.
  Its technology stack includes Arbitrum Nitro (the rollup node software), Arbitrum Stylus (a framework for writing smart
  contracts in Rust, C, and C++ compiled to WebAssembly), the Arbitrum Orbit / Arbitrum chains SDK for launching app-specific
  chains, and BoLD for permissionless dispute resolution. For developers the surface is Ethereum JSON-RPC endpoints for Arbitrum
  One, Nova, and Sepolia, plus first-party TypeScript, Rust, Go, and Solidity SDKs, the cargo-stylus CLI, and extensive documentation
  at docs.arbitrum.io.
url: https://raw.githubusercontent.com/api-evangelist/offchain-labs/refs/heads/main/apis.yml
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://offchain.io/favicon.ico
x-type: company
x-source: vc-portfolio
x-backed-by:
- lightspeed-venture-partners
- polychain
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Blockchain
- Ethereum
- Layer 2
- Arbitrum
- Scaling
- Rollup
- Smart Contracts
- Web3
- JSON-RPC
- Infrastructure
apis:
- name: Arbitrum One JSON-RPC
  description: Public Ethereum JSON-RPC endpoint for Arbitrum One (chain ID 42161), the flagship Arbitrum Layer 2 rollup.
    Supports the standard Ethereum JSON-RPC method set plus Arbitrum-specific precompiles and the NodeInterface.
  humanURL: https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers
  baseURL: https://arb1.arbitrum.io/rpc
  properties:
  - type: Documentation
    url: https://docs.arbitrum.io/build-decentralized-apps/reference/rpc-methods
- name: Arbitrum Nova JSON-RPC
  description: Public Ethereum JSON-RPC endpoint for Arbitrum Nova (chain ID 42170), the AnyTrust chain optimized for low-cost,
    high-throughput applications.
  humanURL: https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers
  baseURL: https://nova.arbitrum.io/rpc
- name: Arbitrum Sepolia JSON-RPC
  description: Public Ethereum JSON-RPC endpoint for the Arbitrum Sepolia testnet (chain ID 421614) for development and testing.
  humanURL: https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers
  baseURL: https://sepolia-rollup.arbitrum.io/rpc
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://offchain.io
- type: Documentation
  url: https://docs.arbitrum.io
- type: DeveloperPortal
  url: https://docs.arbitrum.io/welcome/arbitrum-gentle-introduction
- type: APIReference
  url: https://docs.arbitrum.io/build-decentralized-apps/reference/rpc-methods
- type: GettingStarted
  url: https://docs.arbitrum.io/build-decentralized-apps/quickstart-solidity-remix
- type: Blog
  url: https://offchain.io/blog
- type: GitHubOrganization
  url: https://github.com/OffchainLabs
- type: TermsOfService
  url: https://offchain.io/tos
- type: PrivacyPolicy
  url: https://offchain.io/privacy
- type: LLMsTxt
  url: llms/offchain-labs-llms.txt
- type: Packages
  url: packages/offchain-labs-packages.yml
- type: SDKs
  url: packages/offchain-labs-packages.yml
- type: CLI
  url: cli/offchain-labs-cli.yml
- type: DomainSecurity
  url: security/offchain-labs-domain-security.yml
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 4
  pass: local-v1