# Arbitrum One JSON-RPC

**Canonical:** https://apis.io/apis/arbitrum/one-rpc/  
**Provider:** Arbitrum — https://apis.io/providers/arbitrum/  
**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 10 APIs that [Arbitrum](https://apis.io/providers/arbitrum/) publishes on the [APIs.io](https://apis.io/) network, described by an AsyncAPI event-driven specification. Tagged areas include JSON-RPC, Mainnet, and Arbitrum One. The published artifact set on APIs.io includes API documentation and an AsyncAPI specification.

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.

## Machine-readable artifacts (3)

- **Documentation** — https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers
- **AsyncAPI** — https://raw.githubusercontent.com/api-evangelist/arbitrum/refs/heads/main/asyncapi/arbitrum-asyncapi.yml
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/arbitrum/refs/heads/main/apis.yml

## Other Arbitrum APIs (9)

- [Arbitrum Nova JSON-RPC](https://apis.io/apis/arbitrum/nova-rpc/)
- [Arbitrum Sepolia JSON-RPC](https://apis.io/apis/arbitrum/sepolia-rpc/)
- [Arbitrum Bridge](https://apis.io/apis/arbitrum/bridge/)
- [Arbitrum SDK](https://apis.io/apis/arbitrum/sdk/)
- [Stylus SDK (Rust)](https://apis.io/apis/arbitrum/stylus-sdk/)
- [Arbitrum Nitro](https://apis.io/apis/arbitrum/nitro/)
- [Arbitrum Orbit SDK](https://apis.io/apis/arbitrum/orbit-sdk/)
- [Arbiscan Block Explorer](https://apis.io/apis/arbitrum/arbiscan-explorer/)
- [Arbitrum JSON-RPC API](https://apis.io/apis/arbitrum/arbitrum-json-rpc-api/)

## Tags

JSON-RPC, Mainnet, Arbitrum One

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