Founder spent $638 on Cursor AI coding in six weeks
A founder-CTO accumulated $638 in Cursor on-demand charges over about six weeks (later $928.45 over 70 days), driven by bursts of high-frequency requests and a premium thinking model.
An agent got stuck retrying a failing call, or entered a self-reinforcing loop. Each retry costs money. The fix is a velocity rule and a per-window cap. velocity + per-period total would have rejected or flagged this transaction before any money moved.
daily_max_usd: 200
max_per_minute: 20
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What happened
A founder-CTO accumulated $638 in Cursor on-demand charges over about six weeks (later $928.45 over 70 days), driven by bursts of high-frequency requests and a premium thinking model.
The root cause was classified as Retry / infinite loop. An agent got stuck retrying a failing call, or entered a self-reinforcing loop. Each retry costs money. The fix is a velocity rule and a per-window cap.
This is one of 14 documented incidents in the open registry. Every entry is sourced to a public URL; amounts and dates are as reported by the source.