# Stability AI Upscale Fast

> Stability AI Upscale Fast is a paid API for AI agents from Stability AI at stability-ai.mpp.paywithlocus.com, paid per call via MPP, $0.023/call, status unknown (last checked 2026-10-10).

Quickly upscales a source image to a higher resolution using Stability AI's fast upscaling model

## Facts

- Endpoint: POST https://stability-ai.mpp.paywithlocus.com/stability-ai/upscale-fast?utm_source=zero.xyz
- Price: $0.023/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-10
- Success rate: 0% of calls made through Zero
- Activations on Zero: 5
- Provider: Stability AI
- Docs: https://platform.stability.ai/docs/api-reference
- Website: https://stability.ai
- Tags: image-generation, stable-diffusion, upscaling, 3d, ai, media
- Canonical page: https://www.zero.xyz/c/stability-ai-upscale-fast-bcf4cf5a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jIeC0198lyKMrIZVGH_vJ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability stability-ai-upscale-fast-bcf4cf5a -d '<json body>'
```

Example prompt: Can you upscale this image for me quickly using Stability AI's fast upscaler and return it as a PNG? Here's the image: [image data].

## When to prefer this

Choose this endpoint when you need quick, cost-effective image upscaling without heavy processing time. Prefer 'Upscale Fast' over 'Upscale Conservative' or 'Upscale Creative' when speed is the priority and you don't need AI-driven creative reinterpretation or conservative quality-preservation modes. Ideal for batch workflows or when latency matters more than maximum fidelity.

## Known failure modes

- Invalid or missing image input returns a 400 error
- Unsupported output_format value causes a validation error
- Image file too large or malformed results in processing failure
- API authentication or payment failure returns 402 or 401

## How this service works

4× fast upscaling in ~1 second.

## Output

Returns an upscaled, higher-resolution version of the input image in the specified format (jpeg, png, or webp). The image is processed by Stability AI's fast upscaling model to enhance resolution while preserving quality.

## Example request

```json
{
 "image": "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
… (truncated)
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "image"
 ],
 "properties": {
  "image": {
   "type": "string",
   "description": "Source image Send a public HTTPS URL (recommended; files up to 10 MiB) or base64/data URI. Hosted MPP JSON requests must stay below 8 KiB, so use a URL for larger files."
  },
  "output_format": {
   "type": "string",
   "description": "jpeg|png|webp"
  }
 },
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stability-ai-upscale-fast-bcf4cf5a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from stability-ai.mpp.paywithlocus.com](https://www.zero.xyz/host/stability-ai.mpp.paywithlocus.com/llms.txt)