I've tried octoai.cloud and baseten so far.
octoai.cloud has text to image API, where one SDXL 1024x1024 30 step image costs $0.004. Using a custom checkpoint costs $0.008. If you generate 4000 images per day using base SDXL, that's $0.004 * 1000 = $16 a day.
baseten let's you deploy a comfyui workflow as an API, and the cheapest instance is T4x4x161 T4 GPU, 16 GiB VM, 4 vCPUs, 16 GiB
Costing $0.01052/min, which is $0.01052 * 60 * 24 = $15 a day.
Are there any cheaper options?