Kie.ai is an AI API platform, an aggregator that resells access to generative models made by other companies through one programming interface. With one API key a developer can call video models such as Veo, Kling and Seedance, image models such as GPT Image and Nano Banana, Suno for music, and language models such as GPT, Claude, Gemini and Grok. It is operated by NEXUSAI SERVICES LLC of Denver, Colorado, USA.
All models share one parameter schema, so a program switches models by changing one parameter. The program sends an asynchronous request (it submits a generation task and does not wait for the result); when the video or image is ready, Kie.ai calls a webhook URL that the program gave it, or the program polls for the status. A browser playground tests each model before any code is written.
It is a hosted pay-per-use service with no monthly fee: credits are bought in advance, never expire, are spent per image, per video, per second of video or per million tokens, and are not charged for failed tasks.