Vercel v0 idle agent sessions billed at full rate — receipts show $40+ overnight burns
Users discovered that v0 agent sessions left open in browser tabs continued metering credits at full rate during idle periods. Multiple users reported waking up to bills $40-$200 above expected usage with no active work occurring.
What changed
Panel verdict· 3 frontier models · sealed rubric · Brier-scored
- claude-haiku-4-5ruling · harmful
Idle billing is industry-anomalous and surprised users; courtesy refunds suggest vendor agrees but won't formalize.
74 - gpt-5-nanoruling · harmful
Material unexpected billing with no opt-out and no proactive disclosure.
71 - gemini-2-5-flashruling · harmful
Idle metering violates SaaS norms; documentation does not surface the behavior.
68
Each model graded independently behind a sealed rubric. Verdicts are immutable and Brier-scored against subsequent reality — a public model-accuracy leaderboard, on us.
Response· vendor statement · uncontested
UNCONTESTEDVercel v0 has not publicly addressed this change.212 days since filing · response window has closed · this receipt is marked uncontested.
Predicted impact · est.
high confidenceHeuristic estimate. All users on the affected plan; damage varies by usage. How we estimate ↗
Context · narrative
v0 bills based on credits consumed during 'agent sessions.' The expectation among users was that closing the tab or being inactive would stop metering. In reality, background heartbeats and idle agent loops continued consuming credits for hours. Vercel has not formally acknowledged the behavior, though support has issued courtesy refunds to vocal users.