Stability AI
REST API for Stability AI's Stable Diffusion image generation models, enabling text-to-image, image-to-image, inpainting, upscaling, and video generation via cloud inference.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Image/video generation AI API. API key auth. Generated content policy enforcement. NSFW filter available — enable for consumer-facing use. No user data training by default.
⚡ Reliability
Best When
You need a flexible image generation API with access to Stable Diffusion models including SDXL and SD3, and want control over generation parameters like steps, CFG scale, and sampler.
Avoid When
You need the absolute best image quality for marketing use cases (consider Midjourney or Flux APIs), or you need real-time generation speeds.
Use Cases
- • Text-to-image generation for content creation agents (marketing materials, illustrations)
- • Image-to-image transformation for style transfer and modification workflows
- • Inpainting — agents editing specific regions of images without reprocessing the entire image
- • Automated upscaling of existing images for resolution enhancement pipelines
- • Video generation from images or text for short-form content automation
Not For
- • Real-time image generation requiring sub-second latency (inference takes 3-15 seconds)
- • Photo-realistic portrait generation at commercial quality (use dedicated portrait APIs)
- • Image understanding or classification (use vision models like GPT-4V or Gemini Vision)
- • Applications requiring guaranteed NSFW filtering without additional moderation layer
Interface
Authentication
Bearer token (API key) in Authorization header. Keys are per-account. No per-key scoping or rate limit customization available.
Pricing
Credit-based system. Prices vary significantly by model — SDXL is cheaper than SD3. Credits expire. Must add payment method for continued use after free credits.
Agent Metadata
Known Gotchas
- ⚠ Generation is asynchronous for some endpoints — agents must poll for completion or handle async responses
- ⚠ Content policy enforcement is inconsistent — similar prompts may succeed or fail unpredictably
- ⚠ Seed must be explicitly set for reproducible outputs — random seed by default
- ⚠ Image dimensions must be multiples of 64 for SDXL — off-by-one on dimensions causes errors
- ⚠ API versioning: v1 (deprecated) and v2beta endpoints behave differently — use v2beta for new models
- ⚠ Credit costs are per-generation including failed attempts due to content policy — no refund
- ⚠ gRPC SDK is deprecated in favor of REST — avoid gRPC SDK for new integrations
Alternatives
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Scores are editorial opinions as of 2026-03-07.