AI advertising glossary
Budget reservation (Admux)
A budget reservation is the hold Admux places on your prepaid balance for a campaign’s full budget when you submit the campaign.
What it means
Admux reserves budget in full at submission. The money stays in your balance but is no longer available to other campaigns, which is how Admux keeps a campaign from spending more than you authorized. Before submitting, you request a price offer, valid for 15 minutes; issuing the offer reserves nothing.
A reservation is released only by cancellation, completion or an authorized budget decrease, and only once the channel’s settlement evidence shows the funds were not used. A rejection does not release it, because a rejected leg may be fixed and resubmitted, and a channel can report spend after the fact.
Changes to a live campaign follow the same logic. Accepting a delivery change reprices all remaining delivery at current rates, and an increase reserves only the difference. Reserving more requires the campaigns:reserve scope.
When you buy ads
Check available balance, not total balance, before planning a new campaign: the Admux ledger shows deposits, reservations, charges and releases as separate entries, and a submission that exceeds what is available fails with INSUFFICIENT_FUNDS. If you run agents, a key’s spending limit caps the new budget it can reserve per UTC day, week, month or lifetime, which stops an agent from tying up your whole balance. To free funds early, cancel or lower the budget of a campaign; the release follows settlement, so it is not instant.