Hi Saltwater,
You can get min or max value with separate services.
So you should use two services for this goal.
1 With parameters:
pre
sort = yourField
limit = 1
/pre
2 With parameter:
pre
sort = -yourField
limit = 1
/pre
These two request will return your min and max value.
See more about sort and limit parameters for list service here:
http://devcenter.appery.io/documentat...
Regards.