for the asking

On request, without charge, as in My brother is a lawyer, so for us his advice is free for the asking, or If you want to borrow the tractor, it's yours for the asking. This expression dates from the early 1800s, although slightly different versions of it (such as at one's asking) have been used since the late 1500s.

The adverb has one meaning:

Meaning #1: on the occasion of a request
  Synonym: on request