<b>ads.txt: the bouncer's guest list</b>

<b>ads.txt: the bouncer's guest list</b>

ads.txt is a plain text file at yoursite.com/ads.txt that lists which ad partners are allowed to sell your space. Buyers check it before bidding.

Why it matters: it stops scammers from pretending to sell your inventory. If a real partner isn't listed, careful buyers won't bid through them — you lose money silently.

Tiny example: you add a new demand partner but forget their line in ads.txt. Their bids quietly get rejected, and you never see the warning.

One thing to try: open yoursite.com/ads.txt. Every demand partner you use should have a line. Missing one? That's a fix.

<b>In plain English:</b> ads.txt is the public guest list of who's allowed to sell your ads.