As of now, there is no such thing as an influencer crypto marketplace or influencer crypto platform. The best social media to find crypto influencers is Twitter. On this social media you can see a lot of promotions, giveaways, and shilling from different Crypto and NFT projects, These promoters usually offer other services on other platforms, but Twitter is the crib of crypto promoters at the moment. You can look at websites like Social Blade to find out more about the promoter and to see if it is worth it or it is just another promoter with paid followers.