> ## Documentation Index > Fetch the complete documentation index at: https://openlayer.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Track usage > See what each key and team is consuming and what it costs Usage and cost show what your traffic is actually consuming. It's the reporting side of [usage limits](/gateway/budgets-and-limits): limits set the cap, usage shows where you stand against it. ## Where to see it * The **Usage limits** page shows each limit's current usage against its threshold for the active window. * A **key's detail** page shows requests, tokens, and estimated cost over time, broken down by model and provider. A key's usage and cost over time ## What's tracked For every key, the gateway records each day (UTC): * **Requests**: how many calls the key made. * **Tokens**: input plus output. * **Estimated cost**: in USD. * **Routing**: which incoming model and provider the caller asked for, and which target model and provider served it. ## How cost is estimated The gateway multiplies token counts by its cached per-model pricing. Treat it as a close estimate for tracking and budgeting, not as a replacement for your provider's invoice. ## Go deeper Usage answers "how much." For request-level detail, including inputs and outputs, latency, and the trace of each call, see [Observability](/gateway/observability).