Mediation ranks sources by eCPM 1 if Prebid's slot is reached, the adapter fires 2 matching hb_pb keywords to params 3 — mismatch = "no ad," next source fires. Bids fan out via OpenRTB 4 Winner returns to mediation 6 Unlike 7, this gate sits outside Prebid — the auction never starts if eCPM rank says skip.
FIELD NOTES
- PBS Rules Engine adds a server-side gate — prunes calls before OpenRTB 13
- Auto-refresh 30s Android / 15s iOS — each tick reruns the waterfall