Customer Match, refreshed from your source of truth.

Google requires a minimum number of matched, active users before a Customer Match list can serve, generally in the region of 1,000 for most surfaces. Because match rates vary by identifier quality, a raw list of a few hundred contacts can still fall short after hashing and matching. We monitor matched size per list and flag segments that fall under the threshold, so you can consolidate similar segments or wait for the base to grow before launch.

It depends on identifier quality. Lists keyed on email and phone together typically match a meaningful majority of records once Datahash hashes them to SHA-256 and Google matches against signed-in Google accounts. Single-identifier lists, such as phone only, tend to match less. We report the matched count after every sync so you always know effective reach before you size a campaign around it.

On the cadence you choose, from hourly to weekly. Datahash sends incremental adds and removes through the Google Ads offline user-data job rather than full re-uploads, so refreshes are fast and lists never go stale. For suppression and retention audiences that depend on knowing who bought recently, we default new builds to a daily cadence and tighten it if the account needs faster reaction.