Arbitrum

Arbitrum One JSON-RPC

Public Ethereum JSON-RPC endpoint for Arbitrum One mainnet (chain ID 42161), the flagship optimistic rollup secured directly by Ethereum L1. Supports standard eth_* methods plus Arbitrum-specific precompiles for L1 messaging, retryable tickets, and gas accounting. Public endpoint does not support WebSockets — production teams use Alchemy, QuickNode, Infura, Chainstack, or self-hosted Nitro nodes.

Arbitrum One JSON-RPC is one of 9 APIs that Arbitrum publishes on the APIs.io network.

Tagged areas include JSON-RPC, Mainnet, and Arbitrum One. The published artifact set on APIs.io includes API documentation.

GitHub

Documentation

📖
Documentation
https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers

API entry from apis.yml

apis.yml Raw ↑ 
aid: arbitrum:one-rpc
name: Arbitrum One JSON-RPC
description: Public Ethereum JSON-RPC endpoint for Arbitrum One mainnet (chain ID 42161), the flagship
  optimistic rollup secured directly by Ethereum L1. Supports standard eth_* methods plus Arbitrum-specific
  precompiles for L1 messaging, retryable tickets, and gas accounting. Public endpoint does not support
  WebSockets — production teams use Alchemy, QuickNode, Infura, Chainstack, or self-hosted Nitro nodes.
humanURL: https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers
baseURL: https://arb1.arbitrum.io/rpc
tags:
- JSON-RPC
- Mainnet
- Arbitrum One
properties:
- type: Documentation
  url: https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers