OpenRouter Cost Controls Overview OpenRouter provides per-key credit limits, a credit balance API, and per-generation cost queries. Combined with client-side budget middleware, you can enforce hard spending caps at the key level and soft caps in your application. This skill covers key-level limits, per-request cost tracking, budget enforcement middleware, and alert systems. Check Credit Balance Per-Key Credit Limits Budget Enforcement Middleware Cost-Saving Model Variants Budget Alert Script Error Handling | Error | Cause | Fix | |-------|-------|-----| | 402 Payment Required | Credits exhaus…