Burned $1400 in an Hour: How a Missing Loop Guard in Cursor Led to a Massive Bill (and a Full Refund)

A user’s Cursor AI loop exhausted $1400 of API fees in just one hour because only a monthly spending cap was set, prompting the CEO to issue a full refund and spark a broader discussion on fine‑grained cost controls for AI agents.

AI agentsAPI usageCursor

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Burned $1400 in an Hour: How a Missing Loop Guard in Cursor Led to a Massive Bill (and a Full Refund)