SinkIn is an AI tool that hosts Stable Diffusion models on fast GPUs and helps model creators get paid. Users can subscribe to different plans like Sink In Basic, Sink In Pro, and Sink In Ultimate, which provide varying amounts of monthly credits for model usage. Users can also buy credits individually. SinkIn offers a referral program where both the referrer and the referred user receive extra credits. The tool deploys a wide range of models, including Checkpoint, LoRA, and more, with applications in realistic vision, fashion, art, and anime. SinkIn aims to support model creators by allocating part of the pay to them.