# Arbitrum One 

**Published by:** [KOURAB ](https://paragraph.com/@borahkourab/)
**Published on:** 2023-03-27
**URL:** https://paragraph.com/@borahkourab/arbitrum-one

## Content

Arbitrum One is the name of the mainnet chain built as a layer-2 solution on Ethereum. Although technically still in mainnet beta, Arbitrum One is Arbitrum’s Rollup flagship chain. Arbitrum One has a chainID of 0xa4b1 (decimal: 42161). In the future, Arbitrum Rollup technology may be used in conjunction with other rollup chains.

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