Our ad auction allows us to provide value to both Pinners and advertising partners by serving the highest quality ads at the most relevant moments and optimizing business outcomes for our advertising partners.
For each available ad impression, our auction system selects the best ad for that position, based on the likelihood of a desired action occurring and how much that action is worth to you. The likelihood of the action occurring depends on factors like landing page quality and targeting relevance. Your bid tells us what you'd pay for the action you choose to optimize for.
You pay only what's needed to beat the next best ad in the auction. In some cases, you may pay less than your bid. However, setting bids that are too low may restrict the delivery of your ad. To learn more about setting bids, read this article.