Instead of adding the API key, you need to add the wallet address of your IDEX.
If you do not have a wallet address yet, please follow these steps:
-
Hover over the profile picture (at the top right) then select NEW WALLET
Enter your password then save (copy) the private key
Unlock the wallet
Add/paste the private key in the box, then click unlock
The wallet address will show up, in the dropdown when you hover over your profile
Copy the wallet address then paste it to the IDEX API import page, https://cointracking.info/import/idex_api/