Overpass API User's Manual

More information

Other sources of information about Overpass API.

Language Reference
Systematic and exhaustive enumeration of all elements of the query language including their formal definition.

And further examples for advanced usage.

Page of Overpass API in the openstreetmap wiki. Contains for example the list of public instances including their status messages.

Mailing List
Questions can be asked here. Outages and bugs can be reported here as well.

Roland's Blog
Special subjects are covered in more depth there. Also the features of new versions are presented there.

Installation of an Own Instance
How to install your own private instance.

Source Code
Source code of Overpass API. Also available are Overpass Turbo and this manual.