Stopping Surprise Overage Bills on Supabase — Setting Up Spend Cap to Hand Databases to Vibe Coders Safely

You want to hand a Supabase database to non-developers, but you do not want a surprise pay-as-you-go bill when they blow past quota. Does Supabase have a setting that does not charge for overages? The short answer: the Free plan and the Pro plan's Spend Cap can pin your cost to a flat rate. Here is how it works, what it does and does not protect, the add-on loopholes, read-only mode behavior, and a safe configuration.