# Stability AI Generate Ultra

> Stability AI Generate Ultra is a paid API for AI agents from Stability AI at stability-ai.mpp.paywithlocus.com, paid per call via MPP, $0.057/call, status unknown (last checked 2026-10-10, last successful call 2026-04-15).

Generates high-quality images from text prompts using Stability AI's most powerful Ultra model, with support for style presets, aspect ratios, and img2img workflows.

## Facts

- Endpoint: POST https://stability-ai.mpp.paywithlocus.com/stability-ai/generate-ultra?utm_source=zero.xyz
- Price: $0.057/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-10
- Last successful call: 2026-04-15
- Success rate: 33% of calls made through Zero
- Rating: 2.3 / 5 from 2 reviews
- Activations on Zero: 3
- 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-generate-ultra-09ec597c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_h72GJeMtPaPopm7WEaVu1

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-generate-ultra-09ec597c -d '<json body>'
```

Example prompt: Generate a photorealistic image of a serene mountain lake at golden hour reflecting snow-capped peaks, in 16:9 aspect ratio, photographic style, output as jpeg — and exclude any people or buildings from the scene.

## When to prefer this

Choose Generate Ultra when you need the highest quality Stability AI image generation — better detail, coherence, and realism than SD3 or standard models. Ideal for photorealistic scenes, professional creative outputs, and high-fidelity renders. Prefer over Generate SD3 when quality is paramount over speed or cost. Use img2img mode (with image + strength) to transform existing images while retaining structure.

## Known failure modes

- Missing required 'prompt' field returns a 400 validation error
- Invalid aspect_ratio value returns an error; must be one of the supported ratios (e.g. 16:9, 1:1)
- Providing 'image' (img2img) without 'strength' may result in unexpected behavior
- Invalid style_preset value may be rejected or ignored
- Seed value out of valid range may produce an error
- Network timeout if image generation takes too long under load
- Insufficient USDC balance returns a payment error before generation begins

## How this service works

Stable Image Ultra — highest quality text-to-image generation.

## Output

Returns a binary image file (JPEG, PNG, or WebP) of the generated scene. The image is produced by Stability AI's Ultra model at the highest available quality tier, reflecting the prompt, style preset, aspect ratio, and any exclusions specified.

## Example request

```json
{
 "prompt": "A serene mountain landscape with a clear blue sky and a calm lake reflecting the peaks at golden hour",
 "aspect_ratio": "16:9",
 "style_preset": "photographic",
 "output_format": "jpeg"
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "prompt"
 ],
 "properties": {
  "seed": {
   "type": "number",
   "description": "Random seed"
  },
  "image": {
   "type": "string",
   "description": "Input image for img2img (requires strength) 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."
  },
  "prompt": {
   "type": "string",
   "description": "Text prompt"
  },
  "strength": {
   "type": "number",
   "description": "img2img influence 0–1"
  },
  "aspect_ratio": {
   "type": "string",
   "description": "Output aspect ratio: 21:9|16:9|3:2|5:4|1:1|4:5|2:3|9:16 (default 1:1)"
  },
  "style_preset": {
   "type": "string",
   "description": "Style preset (e.g. photographic, digital-art, cinematic)"
  },
  "output_format": {
   "type": "string",
   "description": "jpeg|png|webp (default jpeg)"
  },
  "negative_prompt": {
   "type": "string",
   "description": "Things to exclude from the image"
  }
 },
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stability-ai-generate-ultra-09ec597c/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)