No Money Down Wholesaling?

[Chris Dilworth]

This may be a silly question, but I need a little clarification on wholesaling. 

Hypothetically, say I have access to a large buyer's network and I need to find good deals for them. Once I have located the property, agreed to a price with the seller and have a contract, do you have to show proof of funds or put up money at all if you can assign the K within the inspection period? I understand the beginning and end of the process, I'm just foggy on the details in the middle, which are the most important. 

I've never done wholesaling before, but I have an opportunity that I don't want to go to waste. Any insight would be helpful. 

Thanks