CryptoTrader.Tax only needs "Read" or "View" access to import your trade history. This permission protects your accounts. Learn more about API access in this article here.
Login to your Nice Hash account.
Navigate to the API Keys section under the Settings Page.
Direct Link: https://www.nicehash.com/my/settings/keys
Click Create New API Key and fill out the the form with the following settings:
View exchange order - Turn this option on
All other options - Turn these off
Copy your API Key and API Secret as these values will be needed later.
Follow the on-screen steps to enter your verification code to fully activate the API key. Once activated, copy your Organization Id.
Navigate to the Nice Hash tab inside CryptoTrader.Tax and enter your API Key, API Secret, and Organization Id into the the provided text boxes.
Finally click Sync Transactions to import your transaction history.