$1,800+ in 48 Hours: Claude Code Scripts Silently Switched to API Billing
Claude Code scripts silently began routing through API billing instead of the subscription, racking up over $1,800 in unexpected charges within 48 hours.
The developer had a Claude subscription. They were using Claude Code scripts as part of their normal workflow. Then the billing path silently switched — and the subscription stopped covering the usage.
Without any notification or configuration change on the developer's part, their Claude Code scripts began routing through direct API billing instead of the subscription. At API rates, the same usage that was previously covered by a flat monthly fee became $1,800+ in 48 hours.
The GitHub issue documented the developer's shock at discovering the charges. They hadn't changed anything. They hadn't opted into API billing. The billing pathway simply shifted, and the cost went from "included" to "catastrophic" overnight.
The incident revealed a dangerous gap in the Claude Code billing model: users can be silently shifted between billing tiers without consent or notification. When your AI tool's pricing model can change underneath you without warning, every script you run is a financial risk.
You thought you had a subscription. Your scripts thought otherwise. $1,800 later, you both found out.
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