<b>Bid request enrichment: the fields that decide before you do</b>

<b>Bid request enrichment: the fields that decide before you do</b>

A bid request is not a neutral fact sheet; it's a partly self-reported document, and several fields shape your bid before your logic runs. Knowing which fields are trustworthy is core craft.

1. Declared fields like viewability prediction, audibility, and content category come from the publisher or SSP and can be optimistic — they describe expected, not realized, outcomes.
2. Some fields are enriched mid-stream by intermediaries (added segments, inferred demographics). Enrichment can add value or add noise you're effectively paying for.
3. Signals like the supply chain object and sellers.json relationship are verifiable; signals like 'predicted viewability 80%' are claims.

The discipline is to separate verifiable fields from claimed ones and to calibrate claimed fields against your own measured outcomes. If a seller's declared viewability is 80% but your post-bid measurement says 55%, you should discount that seller's declared field by the observed gap.

<b>Why it matters:</b> you are bidding on a mix of facts and marketing. Building a per-seller calibration layer — comparing each declared field to what actually happened — turns the bidstream from a document you trust into one you score. That calibration is where sophisticated buyers extract edge that pure price competition can't.