Expired domain finding?

Hello guys.

i m willing too build a script that can search and gather deleted/dropped domains. i don'T want to deal with auctions rather i will find domains related to niche i want to work with. it seems to be not an easy task though. is there any other way than havving access to a spesiphic api or will i be able to scan back links and find them as Argo's software doing something simillar

i can code python somehow btw.