Finish sketches for artist with img2img

Hi, I am an artist and I wanted to try to integrate into my bot the finalization of my sketches using image-to-image generation. But I managed to use and correctly get the result only with model stabilityai/stable-diffusion-xl-refiner-1.0 via inference_client . However, as I understand it is not suitable for my purposes because it does not change the original image only slightly correct it at any settings

Is there any way to solve my problem via API so that
1)it was free (within at least 200-300 free requests per month)
2)the rendering images took place NOT on my computer
Thank you.

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There are hardly any other Image2Image-compatible Inference API models…
There are many things in the Gradio space, including I2I using FLUX, so how about using these via Gradio Client or curl?

Image-to-Image Spaces

Using Gradio via API