What is a fair percentage of equity for finding the deals?

[Benjamin Zwiebel]

Hello all. I need a little insight. So, I am about to enter into a deal with a new partner for a percentage of equity in the properties in exchange for finding the deals. He has exhausted the on market deals for our area and doesn't have time to look for off market deals. My part is that I drive for dollars, contact the owners, set up the meetings, the showings and do the negotiations. His part is he puts up 100% of the money and once the closing happens the property becomes his responsibility. 

For my work I get a percentage of ownership in the properties that I find. My question is this: based on what I described, what would be a fair percentage to ask for?

I cannot find a standard for this type of work and I don't want to open yo high and be offensive or open to low and lose myself money. What do you all think would be a fair % to ask for? 

Thank you in advance to the community for your insight and advice