FLUX 3 Image Klein API Key
Get a FLUX 3 Image Klein API key in about two minutes. One CheaperGen key calls FLUX 3 Image Klein — 2 endpoints — and every other model in the catalog, from $0.0011/image, 87% below Black Forest Labs' official price. Prepaid, no subscription needed.
- Key
- Free
- pay per use
- $10 of credits
- ≈ 9,416
- test images
- First request
- $0.002
- text-to-image
- Models per key
- 45
- 13 developers
Step by step
How to get a FLUX 3 Image Klein API key
- 1
Create an account
Sign up with Google or a magic link sent to your email. No sales call and no waitlist.
- 2
Add credits
Credits are prepaid in US dollars, by card. $10 covers about 9,416 images at 768 with FLUX 3 Image Klein ($0.002 each). Turn on auto top-up if you don't want jobs to stop.
- 3
Create the key
Open Dashboard → API keys, name the key (e.g. “flux-prod”) and copy it. Keys start with
cg_live_, and the full key is shown only once. - 4
Store it as an environment variable
Put it in
CHEAPERGEN_API_KEYon your server or in your secrets manager — never in a browser bundle, mobile app or public repository. - 5
Call FLUX 3 Image Klein
Send the request below. It costs $0.002 (79% below the official $0.009) and returns a generation id you can poll or receive by webhook.
Your first FLUX 3 Image Klein request
curl -X POST https://cheapergen.com/api/v1/run/bfl/flux-3-image-klein/text-to-image \
-H "Authorization: Bearer $CHEAPERGEN_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"prompt": "Editorial still life of a hand-thrown terracotta vase with dried orange ranunculus on a travertine plinth, low golden-hour sun from the left, long soft shadows on a warm plaster wall, medium-format film photograph",
"aspect_ratio": "1:1",
"resolution": "1K"
}'What the key unlocks
FLUX 3 Image Klein endpoints on your key
Every FLUX 3 Image Klein endpoint, with its starting price. The same key also runs the other 44 models.
| Task | Endpoint | From |
|---|---|---|
| Text to Image | POST /api/v1/run/bfl/flux-3-image-klein/text-to-image | $0.0011/image |
| Image Edit | POST /api/v1/run/bfl/flux-3-image-klein/edit | $0.0011/image |
Security
Keep your key safe
Anyone with the key can spend your balance. Details in the authentication docs.
Server-side only
Call the API from your backend. Never ship a key in a browser bundle, mobile app or public repository.
One key per app
Separate keys for production, staging and each integration let you revoke one without touching the others.
Rotate without downtime
Create a new key, deploy it, then revoke the old one. Revocation takes effect immediately.
Watch last-used times
The dashboard shows when each key was last used, so unused or unexpected keys stand out.
Try it
Try FLUX 3 Image Klein before you write code
The same model and price as the API. Press Code in the full-screen Studio to copy the request for any run.
Compared
A CheaperGen key vs a key from Black Forest Labs
| Aspect | CheaperGen | Black Forest Labs directly |
|---|---|---|
| Price | $0.0011/image at 768 | $0.008/image (official list) |
| Models on one key | 45 models from 13 developers | Black Forest Labs models |
| Billing | Prepaid USD credits, per use, failed runs refunded | Black Forest Labs's own billing |
| Same model | Yes — Black Forest Labs’s open-weights FLUX 3 Image Klein | Yes — FLUX 3 Image Klein |
FAQ