Would you mind telling us what you are trying to accomplish? You may get yourself satisfied with a response that doesn't have to do with this API.
I have a web site and i want create a unique "Legacy" & "Nested SegWit" & "Native SegWit" address for every customer to send & receive bitcoin.
So i need a free api to handle this!
Unlimited addresses!
No Expiration of those addresses!
I do n't want use some third party sites like
https://www.coinpayments.net for payment method because i need unique address for every customer for another purpose than payment.