Prepaid balance (Admux)

Admux runs every channel from one account and one balance. You top up once, in US dollars, and each campaign draws from the same ledger. There are no separate ad accounts, invoices or contracts per channel, and every charge is traced to the channel that earned it.

Buying directly works differently on each channel. ChatGPT ads are postpay: self-serve card accounts are charged when a payment threshold is reached and at month end. Gravity requires a payment method before a campaign can launch. With Admux the money is in place first, and each campaign reserves its budget from it.

The balance has three parts you can watch: available funds, funds reserved by submitted campaigns, and funds charged for delivery. Money moves between them through the ledger as campaigns are submitted, settled or cancelled.

Top up enough to cover the full budgets you plan to submit, since a campaign reserves its whole budget at submission and fails if the available balance is short. Read the balance with GET /balance or the balance_get MCP tool. Payments and top-ups are human-only: no API key, including one held by an agent, can add funds or request a refund, which limits what a compromised key could do. Prepayment is not a promise of results; the balance pays for delivery the channels report, plus the disclosed markup, and unused funds return after settlement.