Ads.txt "Authorized Digital Sellers" is a recent IAB tech lab project, aimed at increasing transparency in the programmatic advertising eco-system.
Reference:
How to implement ads.txt?
AppLixir uses Direct-buy, Ad Exchanges and Bidders to serve Ads on web and mobile. As a publisher within AppLixir platform, you will need to implement the Ads.txt in your site.
For publishers:
Google.com, pub-8637246282765423, RESELLER, f08c47fec0942fa0
OATH, - 7475, Reseller, A544843
Spotx.tv, 1590898, Reseller, 7842df1d2fe2db34
AppLixir, #1DEVID, ssd.applixir.com, #2GAMEID
Example:
applixir.com, 123456, ssd.applixir.com 3232