From The Comb Dapp

Click on "exchange", which you can access from the Dashboard

Once on the Rubic platfom, you can trade assets on the Ethereum, Binance, Polygon, Near, Aurora, Avalanche, Fantom, Moonriver, Harmony, Solana, Arbitrum, Telos EVM in exchange for COMB. If this is your first time accessing the Fantom network, you should also purchase some FTM as well, in order to be able to pay for transaction fees on the Fantom network.

In order to utilise a wider array of coins and tokens to purchase $COMB, click on the Rubic icon to access the full Rubic dApp.