Hi there,
I have used google maps api for different projects.
I have several questions:
What kind of travel modes do you want to use? car, bus, walking?
This api breaks the distance into several distances so you can not use it directly for many cases.
for this large number of requests (100X100 =10000) you need to get API key .
I can write a program to extract distance and make an Excel file.
Mehrzad