How to determine the distance between ZIP codes?

Question

API

Good afternoon.
Maybe someone knows the service under the type

zipcodeapi.com

so that you can send a couple of ZIP codes via API and the service would return the distance between them?
This service has only 10 requests per hour in the free plan, and paid ones start from $100 and 200 requests per hour, which is also not suitable.

Answer 1

Make base of indexes and cities. Then knowing the city by index, you can get the distance between them, for example PHP. Yandex maps. How to determine the distance between two points along the roads?