Need help with native platforms

Hello, everyone. I help media buyers upload ads to various services and am currently looking for suppliers of accounts for the following platforms:
-kakao talk
-kayzen
-revcontent
-IronSource
-Inmobi
-Applovin
-Revcontent
-Criteo
-Minimob
-mintegral

Can you please recommend agencies or people who work with accounts on these platforms?