# Source: https://getlago.com/docs/api-reference/add-ons/add-on-object.md

> ## Documentation Index
> Fetch the complete documentation index at: https://getlago.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# The add-on object

> This object represents an add-on, a one-time fee that can be applied on one-off invoices.