If you are referring to the Google Elevation API, then yes, there is a limit. Basically, ALL Google API's have Usage Limits. From the Elevation API webpage:
Usage Limits
Use of the Google Elevation API is subject to a limit of 2,500
requests per day (Maps API for Business users may send up to 100,000
requests per day). In each given request you may query the elevation
of up to 512 locations, but you may not exceed 25,000 total locations
per day (1,000,000 for Maps API for Business users). This limit is
enforced to prevent abuse and/or repurposing of the Elevation API, and
this limit may be changed in the future without notice. Additionally,
we enforce a request rate limit to prevent abuse of the service. If
you exceed the 24-hour limit or otherwise abuse the service, the
Elevation API may stop working for you temporarily. If you continue to
exceed this limit, your access to the Elevation API may be blocked.
If you need more requests, you may have to use Maps API for Business.