Media buying agents — caps that actually hold

Media-buying agents fund Meta, Google, TikTok, X, LinkedIn and Reddit ad accounts with hourly throttles and per-platform virtual cards. Stop the $40k overnight blowups from a runaway bid agent.

• Per-platform virtual card — Meta agent's card can't fund TikTok, period.
• Hourly cap per platform (e.g. Meta $500/hr) — hard reservation, not soft warning.
• Anomaly auto-freeze if CPM spike or ROAS drops 50% from baseline.
• Receipts and invoices structured-extracted from each ad platform inbox.
• Reconciliation export to Northbeam, Triple Whale or your warehouse.