What a Prepaid line with an odd number of units on an invoice means

A "Prepaid" line on an invoice, especially one showing an unusual fractional number of units, is a wallet top-up rather than metered usage or consumption. The unit count looks odd because credits are derived from the money amount divided by the wallet's per-credit rate, which rarely lands on a round number.

How prepaid credits turn into units on the invoice

When someone tops up a wallet, Lago issues an invoice for the purchase amount and grants credits to the wallet. The number of credits is the top-up amount divided by the wallet's credit rate. For example, a top-up of €217.21 on a wallet whose rate is €14.99 per credit grants 217.21 / 14.99 = 14.49 credits. That 14.49 is the "weird" unit count you see on the Prepaid line. It is not usage, it is purchased balance.

How to confirm what happened

Open the invoice's activity logs and the associated wallet. You should see a manual or API-driven top-up on the wallet around the invoice's creation time, with the amount matching the invoice and the credits matching amount divided by rate. Note that a top-up invoice can later be voided while the credits remain, because once the invoice is paid the credits are granted and may already have been consumed on other transactions. A voided top-up invoice therefore does not necessarily mean the credits were reversed.

This article reflects guidance drawn from customer case resolutions. It is not officially supported documentation and may not apply to all situations.