Can A Realtor Make Me An Offer without a Listing Agreement?

[Jim Witten]

I tried searching on BP first. But didn't find anything to my specific question.

There's a real estate agent claiming he has an all-cash buyer for one of my properties. (It is not listed or anything.) He left a pitch-packet with a filled-out Listing Agreement, asking to list the property for 7 days with him so he could show it to the prospective buyer.

I think he's just fishing for a listing and is full of it. 

But if he really does have a buyer, can't he just submit to me a Purchase Agreement contingent on a viewing first? Is there a way for him to make an offer and view it without me signing a listing agreement?

Because I don't see any details about a commission he is owed in the California Realtor Purchase Agreement, so how would I promise him his 5% for example?

Thanks