FLUX.1 Kontext [pro] API Key
Get a FLUX.1 Kontext [pro] API key in about two minutes. One Cheaper Gen. key calls FLUX.1 Kontext [pro] — 2 endpoints — and every other model in the catalog, from $0.0275/image, 31% below Black Forest Labs' official price. Prepaid, no subscription.
- Key
- Free
- pay per use
- Credits from
- $10
- ≈ 363 test images
- First request
- $0.028
- text-to-image
- Models per key
- 41
- 12 developers
Step by step
How to get a FLUX.1 Kontext [pro] 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, from $10 by card. $10 covers about 363 Image images with FLUX.1 Kontext [pro] ($0.028 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.1 Kontext [pro]
Send the request below. It costs $0.028 (31% below the official $0.04) and returns a generation id you can poll or receive by webhook.
Your first FLUX.1 Kontext [pro] request
curl -X POST https://cheapergen.com/api/v1/run/bfl/flux-kontext-pro/text-to-image \
-H "Authorization: Bearer $CHEAPERGEN_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"prompt": "A cozy reading nook with a window seat, rain outside, warm lamplight, illustrated children'\''s-book style",
"aspect_ratio": "1:1"
}'What the key unlocks
FLUX.1 Kontext [pro] endpoints on your key
Every FLUX.1 Kontext [pro] endpoint, with its starting price. The same key also runs the other 40 models.
| Task | Endpoint | From |
|---|---|---|
| Text to Image | POST /api/v1/run/bfl/flux-kontext-pro/text-to-image | $0.0275/image |
| Image Edit | POST /api/v1/run/bfl/flux-kontext-pro/edit | $0.0275/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.
Compared
A Cheaper Gen. key vs a key from Black Forest Labs
| Aspect | Cheaper Gen. | Black Forest Labs directly |
|---|---|---|
| Price | $0.0275/image at Image | $0.04/image (official list) |
| Models on one key | 41 models from 12 developers | Black Forest Labs models |
| Billing | Prepaid USD credits, per use, failed runs refunded | Black Forest Labs's own billing |
| Same model | Yes — official FLUX.1 Kontext [pro] | Yes — official FLUX.1 Kontext [pro] |
FAQ