Offchain

Offchain (formerly Offchain Labs) is a blockchain infrastructure company that builds and maintains core technology for the Ethereum ecosystem. It is the creator of Arbitrum, the leading Ethereum layer-2 scaling solution offering high throughput with Ethereum-grade security; Prysm, a Go implementation of the Ethereum proof-of-stake consensus client that powers roughly a quarter of the network's consensus nodes; and Stylus, which lets developers write smart contracts in Rust, C, and C++ compiled to WebAssembly. Offchain also operates ZeroDev (smart-account / ERC-4337 account-abstraction infrastructure) and the Arbitrum (Orbit) chain SDK for launching custom layer-2 and layer-3 chains. The developer surface is Ethereum-compatible JSON-RPC plus first-party TypeScript and Solidity libraries published under the @arbitrum npm scope; the company does not expose a single hosted REST API. Backed by Redpoint Ventures.

Offchain publishes 1 API on the APIs.io network. Tagged areas include Company, Crypto, Blockchain, Ethereum, and Layer 2.

Offchain’s developer surface includes documentation, getting-started guide, API reference, engineering blog, support, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub
19.5/100 emerging ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5
1 APIs
CompanyCryptoBlockchainEthereumLayer 2ScalingInfrastructureWeb3JSON-RPCSDK

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 19.5/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 9.6 / 20
Commercial Clarity 0.0 / 20
Operational Transparency 0.7 / 13
Governance 0.0 / 12
Discoverability 9.3 / 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: 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 1

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

Arbitrum One JSON-RPC

Public Ethereum-compatible JSON-RPC endpoint for Arbitrum One (chain id 42161 / 0xa4b1), the flagship Arbitrum layer-2 network. Supports the standard Ethereum JSON-RPC method se...

Security Posture 1

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

Offchain 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 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support
Support

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: offchain
name: Offchain
description: Offchain (formerly Offchain Labs) is a blockchain infrastructure company that builds and maintains core technology
  for the Ethereum ecosystem. It is the creator of Arbitrum, the leading Ethereum layer-2 scaling solution offering high throughput
  with Ethereum-grade security; Prysm, a Go implementation of the Ethereum proof-of-stake consensus client that powers roughly
  a quarter of the network's consensus nodes; and Stylus, which lets developers write smart contracts in Rust, C, and C++
  compiled to WebAssembly. Offchain also operates ZeroDev (smart-account / ERC-4337 account-abstraction infrastructure) and
  the Arbitrum (Orbit) chain SDK for launching custom layer-2 and layer-3 chains. The developer surface is Ethereum-compatible
  JSON-RPC plus first-party TypeScript and Solidity libraries published under the @arbitrum npm scope; the company does not
  expose a single hosted REST API. Backed by Redpoint Ventures.
url: https://raw.githubusercontent.com/api-evangelist/offchain/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://www.offchain.io/opengraph/home.jpg
x-type: company
x-source: vc-portfolio
x-backed-by:
- redpoint-ventures
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Crypto
- Blockchain
- Ethereum
- Layer 2
- Scaling
- Infrastructure
- Web3
- JSON-RPC
- SDK
apis:
- name: Arbitrum One JSON-RPC
  description: Public Ethereum-compatible JSON-RPC endpoint for Arbitrum One (chain id 42161 / 0xa4b1), the flagship Arbitrum
    layer-2 network. Supports the standard Ethereum JSON-RPC method set (eth_*, net_*, web3_*) plus Arbitrum-specific precompile
    methods over HTTPS POST.
  humanURL: https://docs.arbitrum.io/for-devs/dev-tools-and-resources/chain-info
  baseURL: https://arb1.arbitrum.io/rpc
  tags:
  - Ethereum
  - Layer 2
  - JSON-RPC
  - Blockchain
  properties:
  - type: Documentation
    url: https://docs.arbitrum.io/for-devs/dev-tools-and-resources/chain-info
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://offchain.io/
- type: DeveloperPortal
  url: https://docs.arbitrum.io/
- type: Documentation
  url: https://docs.arbitrum.io/
- type: GettingStarted
  url: https://docs.arbitrum.io/build-decentralized-apps/quickstart-solidity-remix
- type: APIReference
  url: https://docs.arbitrum.io/for-devs/dev-tools-and-resources/chain-info
- type: Blog
  url: https://offchain.io/blog
- type: GitHubOrganization
  url: https://github.com/OffchainLabs
- type: Support
  url: https://offchain.io/contact
- type: Packages
  url: packages/offchain-packages.yml
- type: SDKs
  url: packages/offchain-packages.yml
- type: LLMsTxt
  url: llms/offchain-llms.txt
- type: DomainSecurity
  url: security/offchain-domain-security.yml
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 4
  pass: local-v1