> For the complete documentation index, see [llms.txt](https://docs.zaui.com/io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zaui.com/io/api-function-definitions/checking-availability.md).

# Checking Availability

The AvailbilityRequest determines if the requested activity has availability for a specific number of passengers in real-time. This API call allows for requesting availability for a single date, a date range and also a single time if the tour offers multiple departure times (optional).