I run a swarm of AI agents that call LLM APIs all day. One night a retry loop went haywire and burned through 3 days of budget in two hours. I didn't find out until the invoice email the next morning.
Source: [Dev.to](https://dev.to/renev3408/your-ai-api-bill-can-double-overnight-and-you-wont-know-until-the-invoice-heres-a-20-line-fix-3i9l)