Fast SDXL API: fal.ai's image-generation model, one key away
Fast SDXL via the ApexApi gateway
Fast SDXL is a image-generation model from fal.ai. Call it through ApexApi's unified, OpenAI-compatible API with one `ak-` key, alongside every other model in the catalog. Pricing is $0.004/image per image, billed pay-per-use from your credit balance with no subscription.
Fast SDXL is served through ApexApi's unified, OpenAI-compatible API. One key, one format, with smart routing and automatic failover. Provider: fal.ai.
Why Fast SDXL
Text-to-image generation
High-quality image generation (and image-to-image where supported) through one API.
Transparent pricing ($0.004/image)
Pay per image from your credit balance. Failed generations aren't billed.
OpenAI-compatible
Drop-in with any OpenAI SDK. Change the base URL and key, keep your code.
Specifications
- Modality
- image
- Context window
- —
- Max output
- —
- Streaming
- —
- Tool / function calling
- —
- Vision input
- —
Fast SDXL pricing
Pay-per-use. No subscription, no minimums. Buy credits and pay only for what you call. Transparent, per-call pricing across every model.
Getting started with Fast SDXL
OpenAI-compatible. Point your client at ApexApi, swap your key, and call it. No new SDK to learn.
import requests
resp = requests.post(
"https://api.apexapi.dev/v1/images/generations",
headers={"Authorization": "Bearer <YOUR_APEXAPI_KEY>"},
json={"model": "stability-ai/fast-sdxl", "prompt": "A serene mountain lake at golden hour"},
)
print(resp.json())Fast SDXL use cases
What teams build with Fast SDXL on ApexApi.
Marketing & creative
On-brand visuals, ad creative, and product imagery at scale.
In-product generation
Generate images inside your app from user prompts.
Prototyping
Rapid concept art and design exploration.
Fast SDXL vs other models
How it compares, and on ApexApi you can switch between any of them with a single string change, same key, same endpoint.
Fast SDXL vs Nano Banana Pro
Compare Fast SDXL against this model on price, capabilities, and latency. A/B them with a single key on ApexApi.
Learn more about Nano Banana Pro API →Fast SDXL vs FLUX.2 Pro
Compare Fast SDXL against this model on price, capabilities, and latency. A/B them with a single key on ApexApi.
Learn more about FLUX.2 Pro API →Why build on ApexApi
One API, every model
OpenAI-compatible. Swap the base URL and key, keep your code. Call 14+ providers and hundreds of models through a single integration.
Smart routing & failover
Per-model provider chains with automatic failover. If one provider degrades, requests route to the next. Your app stays up.
Pay-per-use, no lock-in
Buy credits, pay only for what you call. No subscriptions, no minimums. Switch models anytime with a single string change.
Fast SDXL API: FAQ
How do I use the Fast SDXL API?
Create an ApexApi key, then point your client at https://api.apexapi.dev/v1 and use the model slug. POST to /v1/images/generations with the model slug and a prompt.
Is the Fast SDXL API OpenAI-compatible?
Yes. ApexApi exposes Fast SDXL through the same OpenAI-compatible interface used across the whole catalog. Swap the base URL and API key and keep your existing code.
How much does Fast SDXL cost on ApexApi?
Pay-per-use. See the live price in the Pricing section above. There's no subscription or minimum; you buy credits and pay only for what you call.
Can I switch from Fast SDXL to another model later?
Yes. Change a single string (the model slug) to call any other model in the catalog through the same endpoint and key. No re-integration.
Ready to build with Fast SDXL?
One API key. Every major AI model. Pay only for what you use.
Get your API key, free to start