AI Generation API for Developers
Integrating multiple AI providers takes weeks and costs thousands in engineering time. One API gives you 70+ models with cost estimation, batch processing, and spending controls.
10 developer-focused tools. Transparent per-request pricing with a 20% platform fee. No subscriptions, no credit packs, no minimum spend.
The problem
Multi-provider integration is expensive and fragile
Each AI provider has its own auth, billing, parameter format, and error handling. Here's the cost of building it yourself vs. using one API.
Build It Yourself
FairStack API
"Build it yourself" costs assume 2-4 weeks engineering time for multi-provider integration. API generation costs from OpenAI, Stability AI, and Replicate pricing pages (2025). FairStack costs include 20% platform fee.
10 API tools for every generation task
Batch processing, model selection, background removal, upscaling, and more. Every tool is available via REST API.
Image Tools
8 tools
Catalog Batch
ImageProcess entire product catalog
Batch Generate
Image100 images, one API call
Cost Estimate
ImageKnow the price before you generate
Smart Model Select
ImageBest model for your prompt
Background Remove API
ImageBG removal as a service
Upscale API
Image / VideoImage and video upscale as a service
Style Transfer API
ImageApply any style programmatically
Game Asset
ImageSprites, items, and concept art
Cost comparison
What 10,000 API calls cost per month
A realistic breakdown for a product generating 10,000 images and 500 videos per month.
| Task | DIY Multi-Provider | FairStack API | Savings |
|---|---|---|---|
| Image generation (10,000/mo) | $300-500 | $30-250 | 50-90% |
| Video generation (500/mo) | $250-500 | $21-300 | 40-90% |
| Background removal (5,000/mo) | $250-750 | $125 | 50-83% |
| Integration engineering | $10,000+ | $0 | 100% |
| Year 1 total cost | $20,000+ | $2,000-8,000 | 60-90% |
DIY costs assume integrating 3+ providers with separate billing. Engineering time at $75-100/hr. API costs from provider pricing pages (2025). FairStack costs include 20% platform fee. Actual savings depend on model selection and volume.
Workflows
How developers use the FairStack API
Four common integration patterns.
Product image pipeline
~$0.075 per productAutomate product photo enhancement for e-commerce platforms.
- 1 Batch upload product photos via API
- 2 Remove backgrounds, upscale, and enhance in one pipeline
- 3 Get cost estimate before processing -- no surprise charges
Content generation at scale
varies by volumeGenerate marketing assets programmatically for your users.
- 1 Use smart model selection to pick the best model for each task
- 2 Batch generate images, videos, or audio in parallel
- 3 Monitor costs per project with spending caps
AI agent with budget controls
you set the budgetLet autonomous agents create content within strict cost boundaries.
- 1 Create a project with a monthly budget cap
- 2 Issue API keys with per-request cost limits
- 3 Agent generates freely until budget is reached -- hard stop, no overruns
Multi-modal content pipeline
~$0.35-1.00 per pipelineChain image, video, and audio generation in a single workflow.
- 1 Generate an image from a text prompt
- 2 Animate the image into a video clip
- 3 Add voiceover narration to the final video
One API, full coverage
Everything you need to add AI generation to your product.
AI models available via one API
FairStack model catalog
modalities: image, video, voice, music, talking head
FairStack platform
transparent platform fee on infrastructure cost
FairStack pricing
levels of spending controls: org, project, API key
FairStack billing
Get started
Three steps to your first API call
Create an account and get your API key
Sign up, add $10 in credits, and generate an API key from your dashboard. No approval process.
Make your first generation request
POST to /v1/generate with a model slug and prompt. Get back a URL to your generated asset. One endpoint, any modality.
Set up cost controls
Create projects with monthly budgets, issue scoped API keys with per-request limits. Build confidently knowing costs can't surprise you.
Related guides
Technical resources for building with the FairStack API.
API Quickstart Guide
Get from zero to your first generation in 5 minutes. Authentication, first request, and response handling.
/docs/quickstartAgent Integration Guide
Build autonomous AI agents with hard budget controls. Per-request caps, project budgets, and spending alerts.
/docs/agent-quickstartAPI Reference
Complete reference for all endpoints: generate, quote, batch, models, usage, and billing.
/docs/api-referenceFrequently asked questions
Common questions from developers about the FairStack API.
How is FairStack's API different from using provider APIs directly?
FairStack wraps 70+ models from multiple providers (RunPod, fal.ai, Kie.ai) behind a single REST API. One API key, one auth system, one billing account. You get cost estimation before execution, smart model selection, batch processing, and multi-modal pipelines without integrating each provider separately. The tradeoff: a 20% platform fee on top of infrastructure cost, but you save weeks of integration work and get built-in fallbacks.
What does cost estimation look like in the API?
Call POST /v1/quote with your generation parameters. You get back the exact cost in microdollars before any credits are deducted. The quote is valid for 60 seconds. Confirm to execute. This means your app can show users the price before generating, set budget caps per project, and prevent surprise costs. No other multi-model API offers pre-execution cost transparency.
Can I set spending limits per API key?
Yes. FairStack has three levels of spending controls: organization-level caps, project-level monthly budgets, and per-API-key limits (total and per-request). This is designed for agent workflows where autonomous systems generate content. Set a $50/month cap on a project and the API returns a 402 error when the budget is exhausted -- no runaway costs.
What batch processing capabilities are available?
The batch generate endpoint accepts multiple generation requests in a single API call. Each item in the batch runs independently -- if one fails, others still complete. You get per-item cost breakdowns and status. Ideal for catalog processing, asset generation pipelines, or any workflow that processes multiple inputs in a loop.
What models are available through the API?
70+ models across 5 modalities: image (26), video (18), voice (10), music (8), and talking head (10). Every model available in the web app is available via API at the same price. Use the GET /v1/models endpoint to list all available models with their capabilities, pricing, and parameter schemas.
Is there rate limiting on the API?
Rate limits are generous and based on your account status. The API supports concurrent requests and returns standard rate limit headers (X-RateLimit-Remaining, Retry-After). For high-volume batch processing, use the batch endpoint which queues requests efficiently. Contact us if you need custom rate limits for your use case.
Start building with the FairStack API
70+ models. One API. Transparent pricing.
No subscription. Pay per request. Full cost transparency on every call.
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