In The Great Gatsby, what does Gatsby offer Nick in return for Nick's cooperation in inviting Daisy to his house?
At the beginning of chapter 5, Nick informs Jay Gatsby that he has spoken to Jordan Baker and has invited Daisy over for tea. After briefly discussing what day suits everyone best for tea, Gatsby offers Nick an opportunity to make some money by working for one of his side businesses. Gatsby assures Nick that the job would not take up much of his time and mentions that it is "a rather confidential sort of thing." Nick realizes that Gatsby's job offer is for a service to be rendered and says that he already has his hands full at his current job. Looking back on the moment in retrospect, Nick acknowledges that under different circumstances Gatsby's job offer would have been a crisis in his life. Gatsby's ambiguous job offer is more than likely connected to his lucrative bootlegging business, which is why he tells Nick that it is "confidential" and does not go into detail about its requirements.
The answer to this can be found in Chapter 5. There, Gatsby essentially offers Nick money in exchange for going along with his plan for getting Daisy to meet with him. When Nick tells Gatsby that he has asked Daisy to tea, Gatsby rather awkwardly starts to try to offer him money in a roundabout way. He asks Nick if Nick wouldn’t like to do some work for him. Nick gets somewhat offended by this because he does not like the idea of being paid off for doing Gatsby a favor. Therefore, he does not accept Gatsby’s offer.