1. Use the free tier: Many Google API services offer a free tier that allows you to make a certain number of calls or use a certain amount of data for free. Be sure to take advantage of this free tier when possible.

2. Use discounts: Google often offers discounts on its paid API services. Be sure to check for these discounts before you purchase any API service.

3. Use prepaid credits: You can often save money on Google API services by purchasing prepaid credits. This allows you to pay for the service in advance and then use the service as needed.

4. Use the Google Cloud Platform: The Google Cloud Platform provides a variety of discounts and pricing options that can help you save money on Google API services. Be sure to explore the options available to you through the Google Cloud Platform.