How to reverse-engineer a publisher's hidden floor price

How to reverse-engineer a publisher's hidden floor price

Publishers rarely disclose floors (the minimum bid an SSP will accept), but you can infer them from your own loss data. Here's the procedure.

1. For a single publisher-SSP pair, pull every auction where you lost AND every auction where you won, with your bid on each.

2. Plot win rate as a function of your bid. Below the floor, win rate is flat at zero no matter how the bid varies within that band.

3. The bid value where win rate lifts off zero is the soft floor estimate. Below it, no bid clears regardless of competition.

4. Repeat by hour of day and by device. Many publishers run dynamic floors that flex with demand, so a single number hides the real structure.

5. Cross-check against unified pricing rules if the SSP runs them — a flat hard floor produces a sharp cliff; a dynamic floor produces a soft ramp.

6. Bid just above the inferred floor on price-sensitive segments and let valuation drive the rest.

Why it matters: Bidding blind into an unknown floor wastes auctions you can never win and overpays on ones you'd win cheaply. Reconstructing the floor curve from your own loss logs turns the publisher's private pricing into a map you can navigate — no SSP cooperation required.