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REST API v1.0

One API.
137+ models.
Five modalities.

Image, video, voice, music, and 3D generation through a single REST API. Every response includes the exact cost in dollars.

GPT Image 2 · FLUX.2 · Veo 3.1 · Seedance 2 · ElevenLabs · Suno · Kling 3.0 · and 130 more

Get API Key → Read Documentation
terminal 
curl -X POST https://api.fairstack.ai/v1/generations/image \
  -H "Authorization: Bearer $FAIRSTACK_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"gpt-image-1.5","prompt":"A mountain lake"}'

# Response
{
  "id": "gen_abc123",
  "url": "https://media.fairstack.ai/...",
  "model": "gpt-image-1.5",
  "cost": {
    "amount": 0.009,
    "currency": "USD"
  }
}
137
AI Models
5
Modalities
99.9%
Uptime SLA
$0
Monthly fee
API SPRAWL

One integration. Every modality.

Every new modality means another provider, another dashboard, another billing system, another set of docs.

WITHOUT FAIRSTACK
  • × OpenAI — images, separate billing
  • × Replicate — video, GPU-second pricing
  • × ElevenLabs — voice, credit-based tier
  • × Suno — music, subscription only
4 dashboards. 4 billing systems. 4 auth flows. 4 sets of docs.
WITH FAIRSTACK
  • ✓ One API key for all modalities
  • ✓ One billing dashboard in real dollars
  • ✓ One set of docs, one SDK
  • ✓ Switching models = changing one parameter
137+ models. One integration.
SDK

Three lines to generate anything.

Same SDK, same pattern, every modality. Switch from image to video by changing the method call.

Image @fairstack/sdk 
import FairStack from "@fairstack/sdk";

const fs = new FairStack();

const image = await fs.image.generate({
  model: "gpt-image-2-t2i",
  prompt: "A mountain lake",
});

console.log(image.url);
// cost: $0.012/image
Voice @fairstack/sdk 
import FairStack from "@fairstack/sdk";

const fs = new FairStack();

const audio = await fs.voice.generate({
  model: "elevenlabs-multilingual-v2",
  text: "Welcome to the show",
});

console.log(audio.url);
// cost: $0.216
Video @fairstack/sdk 
import FairStack from "@fairstack/sdk";

const fs = new FairStack();

const video = await fs.video.generate({
  model: "kling-3-0-std",
  prompt: "A timelapse of clouds",
});

console.log(video.url);
// cost: $0.12/s

Also available: pip install fairstack for Python

ENDPOINTS

APIs for every creative modality.

One API key. 137+ models across image, video, voice, and music. Switch models in one line of code.

Image Generation

/v1/generations/image

34 models including Z-Image Turbo, FLUX.2, Seedream 4.5, Nano Banana Pro, GPT Image 2. Text-to-image, image-to-image, inpainting, upscaling.

$0.0048/image

Z-Image Turbo FLUX.2 Seedream 4.5 Nano Banana Pro GPT Image 2

Video Generation

/v1/generations/video

64 models including Veo 3.1, Kling 3.0, Seedance 2, Wan 2.6, Sora 2. Text-to-video, image-to-video, video extend, restyle.

$0.0096/s (480p)

Veo 3.1 Kling 3.0 Seedance 2 Wan 2.6 Sora 2

Voice & TTS

/v1/generations/voice

10 models including ElevenLabs Multilingual V2, Fish Audio S2.1 Pro, Qwen3-TTS, IndexTTS2. Text-to-speech, voice cloning, emotion control. 168 built-in voices.

$0.018/1K chars

ElevenLabs Multilingual V2 Fish Audio S2.1 Pro Qwen3-TTS IndexTTS2

Music Generation

/v1/generations/music

19 models including Suno, Mureka V9, Mureka BGM. Text-to-music, lyrics-to-song, instrumental generation. Up to 8 minutes per track.

$0.036/track

Suno Mureka V9 Mureka BGM
REAL DOLLAR PRICING

No credits. Just dollars.

Every API response includes the exact cost in USD. Infrastructure cost + 20% margin = your price. We publish the math.

  • Every response includes cost in USD
  • Call /v1/cost-estimate before generating
  • No credits to decode, no token math
  • 20% margin on infra cost — published formula
Model Direct FairStack
GPT Image 2 $0.05+/image (OpenAI API) $0.012/image (low quality tier)
ElevenLabs Multilingual V2 $0.30/min (ElevenLabs Creator) $0.216/1K chars
Veo 3.1 Fast $0.50 per 5s (Google) $0.18/s
Kling 3.0 Standard Credit-based $0.12/s
See full pricing calculator →
BUILT FOR PRODUCTION

Not just another aggregator.

Full cost controls, structured errors, and real documentation.

Scoped API Keys

Create keys with granular permissions: restrict by modality, set per-request cost limits, set total spending caps. Revoke instantly.

3-Level Spending Caps

Hard limits at organization, project, and API key level. Requests exceeding caps get a 429, not an invoice. Safe for autonomous agents.

Webhooks

Register endpoints per org. Get notified on generation.completed, generation.failed, and balance.low events. Automatic retries with delivery logs.

Cost Simulation

Call /v1/cost-estimate before generating. Know the exact price, choose the model, then execute. No other API does this.

Structured Errors

Every error includes a machine-readable code, human message, and request trace ID. No guessing what went wrong.

MCP Server

Agent-native integration for Claude, GPT, custom agents. Your AI can generate images, video, and audio as tool calls.

INTEGRATE

Ship in minutes.

REST API, webhooks, SDKs, and MCP — everything you need to ship.

Quickstart

First generation in under 5 minutes.
API Reference

35+ endpoints, full OpenAPI spec.
SDKs

TypeScript and Python. npm/pip install.
MCP Server

Agent-native integration for Claude, GPT.

Ship AI features this week.

137+ models. One API key. No subscription. No monthly fee.

Get API Key → Read the Docs