Hi Epic_0range!
You can obtain credits either way!
You can buy credits through the website https://minehut.com/shop/credits
or
You can also get free credits by linking your Minecraft account to your Minehut account then voting for Minehut.
To link your account, go to https://minehut.com/profile and click the Link Account button. After that, go vote using this link: https://minecraftservers.org/vote/443456 .
You can vote daily and each vote will give you 25 credits!
I hope this helps you with your question.
Please post under the correct category next time, Thanks!