On Avalanche®, transaction fees are paid in the native asset, AVAX. In order to send transactions on the Avalanche C-Chain, you must have sufficient AVAX in your wallet to cover the cost of the gas for the transaction. To help you get started on Avalanche, the Avalanche Bridge will airdrop you a small amount of AVAX if you move more than $75 (subject to change) worth of tokens over from Ethereum. In order to avoid running out of AVAX to cover your transaction fees, we recommend first buying an adequate amount of AVAX. You can do so on Pangolin.
For a more in-depth read on how the Avalanche Bridge works, please read the following articles.
For any additional questions, please visit our knowledge base or contact a support team member via the chat button at support.avax.network.