X promised Y that he would pay Y $500 for every qualified buyer he found who was interested in learning about and possibly investing in X's new business venture. On September 22, 2020, Y presented X with a list of names, addresses and phone numbers of 3 wealthy, well-qualified individuals who were all interested in the possibility of investing in X's new business. Y is claiming there is a contract with X, and he is seeking to recover $1500 from X. If this case were being decided by a court and the court concluded a contract did exist between X and Y, the court would most likely conclude which one of the following types of contract existed:

Quasi contract

Bilateral contract

Unilateral contract

Voidable contract

Sua sponte contract

thoroughly explain the reasoning you used to select your answer.