Hello,
Domain trading is now a days is a best way to earn.
So do you own your own database regarding the same.
OR
Do you have your own domain which you want to sell.
If you don't have any then you can go ahead with the affiliate marketing with go daddy, Namecheap, hostinger etc.. just in one platform.
Once people buy from your affiliated link you will get revenue .
So ,price is negotiable.
Please hold the chat button to get in touch with me.
I will develop website (frontend and the backend ),API for you at this price.
Looking forward to work with you.
Thanks