[D] Are there any cloud GPUs billed on compute/utilization instead of uptime?

I'm launching an photo processing app that uses GPUs for inference on a large-ish image processing model. Right now, there are only a few users, so my GPU instance is idle 99.99% of the time–but I'm paying $400+ per month for the GPU to be idle. I could spin up the GPU instance when a user triggers an inference job, but this would mean the user waits for several minutes for the instance to come up. Can't afford that latency. …

app cloud compute gpu gpus image image processing inference instance machinelearning per photo processing