# Offchain Labs

**Canonical:** https://apis.io/providers/offchain-labs/  
**Website:** https://offchain.io  
**APIs profiled:** 3

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.

## Kin Score — 23.1 / 100 (emerging)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 23.1).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Operational Transparency | 5.3 |
| Developer Ergonomics | 50.0 |
| Commercial Clarity | 21.1 |

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## APIs (3)

- **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 (1)

- **Offchain Labs Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Tags

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

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/offchain-labs/). Scores are computed from the provider's own public artifacts under a published rubric.