Hi,
I am a betfair developer with 5 years of experience in this field
I have a betfair developer license
i can provide your program with a costless full API subscription .
You must be aware that you will have to place bets from time to time on your betfair account,
because if you crawl odds only without bet placement betfair will sooner or later cancel the subsription, that happened already to several my customers.
Regards Ihor