Exchange credits are what you earn for participating in and completing exchanges. They are free to earn, and you’ll accumulate more with each exchange you participate in and successfully complete.
Everyone begins with one starter credit when they sign up for Reddit Gifts, as a minimum of one credit is needed for nearly all exchanges.
We have a credit system in place to try to ensure that people do not sign up for many exchanges just to receive gifts. If you fail to successfully complete an exchange, your credits will be reset to -1 until you complete all required steps of the incomplete exchange. Once you have completed the exchange, all credits will be restored.
You can read more about exchange credits by clicking here.