Meta says your event match quality is low
Low event match quality means Meta cannot reliably tie conversions to people, so attribution and optimization suffer. It usually comes down to missing customer parameters and no server-side backup.
Signs this is happening to you
- Events Manager shows a low or red event match quality score
- Purchases fire but Meta attributes few of them
- ROAS in Ads Manager looks worse than your real revenue
- Match quality dropped after a checkout or theme change
What's usually causing it
- Missing customer-information parametersMeta matches on hashed email, phone, name, and similar fields. When the event sends without them, match quality falls.
- No Conversions API to enrich and back up eventsServer-side events can include more match parameters and survive blockers, which the browser pixel alone cannot.
- Browser-only events stripped by iOS and blockersWhen the browser event is blocked, Meta loses both the conversion and its match data.
- Parameters dropped after a checkout changeA migration can strip the customer fields the event used to carry, lowering match quality without an obvious error.
How Mimetic finds it and ships the fix
Mimetic completes a real purchase and inspects exactly which match parameters your Meta events carry, browser and server side, then fixes the gaps.
- We run a purchase and capture the Meta events and their parameters
- We check which customer-match fields are present, missing, or empty
- We verify whether the Conversions API is enriching and backing up the events
- We open the fix as a pull request so events carry the parameters Meta needs
Meta can only match conversions to people when the event carries the right hashed fields. Adding the missing parameters and server-side coverage is what raises the score.
Questions
What actually raises event match quality?
Sending more valid customer-match parameters with each event, like hashed email and phone, and backing the browser pixel with the Conversions API server side. Mimetic shows you which parameters are missing today.
Is the Conversions API required to fix this?
It is the most reliable fix. Server-side events can carry more match fields and survive iOS limits and blockers, which the browser pixel alone cannot. Mimetic flags whether yours is set up and firing.
Why did my match quality suddenly drop?
A checkout or theme change can strip the customer fields your event used to include, lowering match quality with no obvious error. Mimetic compares what the event carries now against what Meta needs.