The Arbitrum portal shows the available fiat on-ramps for directly purchasing ETH on Arbitrum One. Fiat on-ramping usually comes with greater fees, and is only recommended as a solution for those without access to a centralized exchange, or without funds on the Ethereum mainnet in a self-custody wallet.

Steps to purchase ETH on Arbitrum One with fiat

1. Visit the Arbitrum portal: https://portal.arbitrum.one/
2. Click “Fiat On-Ramp” to filter for fiat on-ramps into Arbitrum
3. Select the fiat on-ramp product you wish to use
4. Follow the on-ramp product’s steps for purchasing ETH on Arbitrum One