# Arbitrum One JSON-RPC

**Canonical:** https://apis.io/apis/offchain-labs/arbitrum-one-json-rpc/  
**Provider:** Offchain Labs — https://apis.io/providers/offchain-labs/  
**Base URL:** https://arb1.arbitrum.io/rpc  
**Documentation:** https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers

Arbitrum One JSON-RPC is one of 3 APIs that [Offchain Labs](https://apis.io/providers/offchain-labs/) publishes on the [APIs.io](https://apis.io/) network. The published artifact set on APIs.io includes API documentation.

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.

## Machine-readable artifacts (2)

- **Documentation** — https://docs.arbitrum.io/build-decentralized-apps/reference/rpc-methods
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/offchain-labs/refs/heads/main/apis.yml

## Other Offchain Labs APIs (2)

- [Arbitrum Nova JSON-RPC](https://apis.io/apis/offchain-labs/arbitrum-nova-json-rpc/)
- [Arbitrum Sepolia JSON-RPC](https://apis.io/apis/offchain-labs/arbitrum-sepolia-json-rpc/)

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/offchain-labs/arbitrum-one-json-rpc/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/offchain-labs/.