Google API key is really required?

Question

I am using 2 google place APIs in my iPhone app. From beginning I have used it with API keys. But because of over requests that Keys got expired and I cannot fetch the results. Then I use these APIs with out keys. This is working fine and giving me proper results. I have been using this for last 5 days without any problem.

But I need to confirm that is there any issue or will I face any problem in future if I use with out keys. I am using like this

  http://maps.googleapis.com/maps/api/geocode/json?address=Australia&sensor=true

Answer 1

The limit is 2,500 requests/day for free accounts which means without key, and 100,000 requests/day for Maps for Business customers, check this.

So unless you may exceeds the free daily limit no need to use keys.