Soft-Floor Price

Also known as: soft floor, soft price floor

A soft-floor price is a secondary price threshold used in programmatic advertising, set below the hard floor price, designed to capture bids that fall only slightly under the hard floor and would otherwise be rejected outright.

In a standard auction setup, any bid below the hard floor is simply discarded, generating no yield for the publisher. The problem is that bidders don't always know exactly where the hard floor sits, so a bid may miss it by a small margin — not because the bidder is unwilling to pay a reasonable price, but due to imperfect information. The soft floor addresses this gap: rather than letting those near-miss bids go to waste, the auction can still accept them at a reduced clearing price, recovering revenue that would otherwise be lost entirely.

The soft-floor mechanism is a yield optimization tool. Publishers use it to balance price integrity (maintaining the hard floor as a true minimum for direct deals and preferred buyers) with revenue recovery (monetizing inventory that would otherwise go unfilled due to marginal bid shortfalls).