Great question!

Here are a few things you should know about them:

Here is what credits get you:

Email enrichment:
1 valid email (so verification is included) = 1 credit
Real-time catch-all validation = 0.25 credit/valid catch-all

Phone enrichment:
1 verified phone number = 10 credots

LinkedIn API:
1 scraped lead from Sales Navigator = 0.25 credits

Credit roll over:

Your credits roll over capped at your credit package.
For example: You have a 5000 credits package. In that case, up to 5000 unused credits will roll-over to the next month.