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Lilac tracks usage per request at the token level. You can monitor consumption and costs from the dashboard.

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Viewing Usage

Navigate to Billing in the dashboard to see:
  • Token usage over time — prompt and completion tokens, broken down by day
  • Per-model breakdown — usage and estimated cost for each model
  • Per-key breakdown — usage attributed to individual API keys

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How Usage is Calculated

Each request records:
MetricDescription
Prompt tokensTokens in your input messages
Completion tokensTokens generated by the model
Total tokensSum of prompt + completion tokens
Your cost is calculated as: 
cost = (prompt_tokens × input_price) + (completion_tokens × output_price)
See Pricing for current per-token rates.

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Invoices

Invoices are generated monthly and available in the Billing section of your dashboard. Each invoice includes a full breakdown of usage by model and API key.

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Managing Spend

  • Credit balance — visible at the top of the Billing page
  • Auto top-up — automatically add credits when your balance drops below a threshold
  • Per-key tracking — create separate API keys for different projects or environments to track spend independently

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Enterprise billing

Enterprise customers can opt into monthly invoicing instead of prepaid credits. With monthly billing, you are invoiced at the end of each billing cycle for your usage — no need to maintain a credit balance. To set up monthly invoicing, contact us at contact@getlilac.com.