Inside the Bidder

You are a packet of signals, not a name

When a bid request is sent, it doesn't include your name, email, or any personally identifiable information. Instead, it contains a snapshot of the moment: what device you're on, roughly where you are, what kind of page you're reading, and behavioral segments inferred from your browsing history.

Each DSP checks the signals against its own targeting criteria

Walmart's buying platform (Walmart Connect) has a checklist: are you near a store? Have you visited their site before? Are you shopping on mobile? Each criterion is evaluated in real time against the bid request signals. The more criteria that match, the more confident — and aggressive — the bid.

The same signals mean different things to different advertisers

Nike sees a sports fan and bids modestly. Apple sees an iPhone user but no recent tech search, so it hedges. Delta sees almost no travel signals and bids low. Walmart sees a confirmed shopper who visited their site — and bids highest. Not because Walmart has the biggest budget, but because this specific person is most valuable to them right now.

The bid price is built from components — and first-party data changes everything

Every bid starts with a base floor. Contextual match (right page topic) and audience data (behavioral segments) add small increments. But first-party data — signals an advertiser owns directly, like 'this person has shopped with us before' — is far more precise than any third-party guess. That's Walmart's edge here.