The ID-bridging your SSP didn't disclose

The ID-bridging your SSP didn't disclose
Heard: some SSPs quietly enrich your bid requests with probabilistic ID 'bridges' to keep addressability up in cookieless environments. Buyers who detect mismatched IDs flag the seat for low quality — and your supply eats the reputation hit, not the SSP.
— Ask whether your SSP appends any deterministic or probabilistic IDs
— Request the option to send unenriched requests and A/B the eCPM
Impact: undisclosed bridging can poison your seat quality score. Confidence: rumor.