Bill for what your customers use

Send usage events from your API. Passage meters them, prices them against your plans, and produces invoices and exports your finance team can close the month on.

Send your first event · See pricing

How it works

1. Send events. One POST /v1/events per batch of up to 500, with an Idempotency-Key, so a retry never counts twice.
2. Meter them. Count calls, sum gigabytes, take the peak of seats, or count unique users.
3. Price and invoice. Tiered, volume or package prices per meter, in any currency. Preview a customer’s invoice any day of the month.

Built for month-end

• Invoice previews that match the final invoice.
• Raw events as CSV, to reconcile against your own records.
• Usage alerts (beta): a webhook when a customer crosses a threshold.

Who uses Passage

API companies from their first paying customer to millions of events a day. Meet our customers.