The fee follows reality
Calculated on what Google actually charged that week. Spend less, pay less, immediately — no reconciliations, no forecasts.
It shortens the feedback loop
A bad week is visible in an invoice rather than buried in a monthly summary. That is uncomfortable for us, which is the point.
It makes leaving easy
No notice period plus weekly billing means the relationship has to justify itself continuously. We prefer that to a contract doing the work.