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 support, documentation, API reference, getting-started guide, engineering blog, CLI, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

22.6/100 emerging ▬ flat Agent 0/100 human only Front door AI 3/6 light saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

3 APIs

Company Blockchain Ethereum Layer 2 Arbitrum Scaling Rollup Smart Contracts Web3 JSON-RPC Infrastructure

Kin Score

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

Composite quality — 22.6/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 8.9 / 17

Access Clarity 3.6 / 17

Operational Transparency 0.3 / 11

Contract Governance 0.0 / 10

Discoverability 6.7 / 9

Regulatory Posture 2.1 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 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 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

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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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/offchain-labs: 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 →

Standards implemented 1

Interfaces this provider implements that became standards by being copied rather than ratified. Each is profiled by the API Commons, and the evidence column says how the claim was established — not that it was made.

The Ethereum JSON-RPC Interface

tested — the operations were called against a live endpoint

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

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

Packages

SDKs

CLI

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

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)

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
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
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: '0.23'
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: Support
  url: https://offchain.io/contact
- 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

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