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Over the past few year, we have developed many highly accurate algorithms to determine if an email address is valid or not, including :
All payments are a one-time fee with no hassles, no contracts
Credits never expire
Pack for 1 000 Emails : $5.
Contact us for larger packs
Our experience shows that you can remove ~99% of invalid emails with the Credits Packs, and you can remove ~70% of invalid emails with the Light API
The LightAPI emails quota resets the 1st of every month.