How to do your BASE taxes

What is BASE?

BASE is an Ethereum layer-2 chain, built in collaboration with Coinbase and Optimism, offering improved scalability and efficiency, faster transaction speeds, and lower gas fees.


Follow these steps to sync your BASE data automatically to Koinly:

  1. Open your BASE wallet app
  2. Locate and copy your public address or key

On Koinly:

  1. Create a free account on Koinly
  2. Complete onboarding until you get to the Wallets page and find BASE in the list
  3. Select API > Paste the public address/key you copied above in the appropriate box
  4. Hit Import and wait for Koinly to sync your data. This can take a few minutes
  5. Review your transactions on the Transactions page to ensure everything is tagged correctly and no missing data
  6. Go to the Tax Reports page to view your tax liability!
Having trouble connecting BASE with Koinly?

Your frequently asked questions

How are BASE transactions taxed?
How do I get a BASE tax report?
How do I export my BASE transaction history?