# Arbitrum One JSON-RPC

**Canonical:** https://apis.io/apis/offchain/arbitrum-one-json-rpc/  
**Provider:** Offchain — https://apis.io/providers/offchain/  
**Base URL:** https://arb1.arbitrum.io/rpc  
**Documentation:** https://docs.arbitrum.io/for-devs/dev-tools-and-resources/chain-info

Arbitrum One JSON-RPC is published by [Offchain](https://apis.io/providers/offchain/) on the [APIs.io](https://apis.io/) network. Tagged areas include Ethereum, Layer 2, JSON-RPC, and Blockchain. The published artifact set on APIs.io includes API documentation.

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.

## Machine-readable artifacts (2)

- **Documentation** — https://docs.arbitrum.io/for-devs/dev-tools-and-resources/chain-info
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/offchain/refs/heads/main/apis.yml

## Tags

Ethereum, Layer 2, JSON-RPC, Blockchain

---

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