1. Go to the CoinBase Commerce website and setup an account here.

2. In your Coinbase Commerce account, select which cryptocurrencies you will accept for payment:

3. In your Coinbase Commerce account, in settings, create an API key, Reveal it, Copy it:

4. In your Free.Auction Members Area, Go to My Account > Account Settings :

5. paste your API key where is asks then click Proceed.

You are done. Now you can accept cryptocurrency as payment for your auctions and pay site fees with crypto if you want.