How to Use the black-forest-labs/flux-3/video-upscale API: video to video integration guide (2026)
Learn how to call the black-forest-labs/flux-3/video-upscale API on NamiFusion: parameters, pricing (from ≈$0.790) and runnable copy-paste code — try it in the playground first.
black-forest-labs/flux-3/video-upscale is a video to video model by Black Forest Labs: From $0.79 for 1 second at default creativity=1; $0.55/second at creativity=0. Billed by input duration, rounded up to whole seconds. FLUX Video Upscale enhances MP4 videos with source-faithful or creative detail reconstruction, configurable 1.5x to 3x scaling, and improved visual clarity for video restoration, social content, ads, and production workflows. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing. On NamiFusion you can try it in the playground (exact quote shown before you submit), then call it through one unified REST API — about $0.790 per typical run.
TL;DR
· Task type: video to video, provided by Black Forest Labs
· Pricing: about $0.790 per typical run ($1 = 100 credits), pay-as-you-go
· Getting started: playground (exact quote before submit) → create an API key → one POST request
· Tunable parameters: 3 (see the table below)
· No platform watermark; commercial use allowed (per the Terms of Service)
What can you build with black-forest-labs/flux-3/video-upscale?
Short-form video and ad clips: go from a prompt or a single image to publishable motion content.
Product demos and concept previews: validate storyboards and visual direction cheaply before any shoot.
A social content factory: batch vertical clips and ride trending topics fast.
Remixing existing assets: image-to-video brings static work to life and extends its lifespan.
How do you call this API?
- Sign up on NamiFusion and create a key on the API Keys page (signup bonus credits can only be used on selected models).
- Submit a task with the cURL example below, passing your key as a Bearer token.
- Poll the task status with the returned task_uuid and read the output URLs when completed.
# 1) Submit — returns { "task_uuid": "..." }
curl -X POST "https://www.namifusion.com/api/v1/marketplace/run/black-forest-labs/flux-3/video-upscale" \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"input": {
"upscale_factor": 2,
"creativity": 1
}
}'
# 2) Poll until status is "completed", then read the output URLs
curl "https://www.namifusion.com/api/v1/marketplace/run/tasks/TASK_UUID" \
-H "Authorization: Bearer YOUR_API_KEY"What parameters does it take?
prompt (Prompt): optional
upscale_factor (Upscale Factor): optional, default 2
creativity (Creativity): optional, default 1
How do you write prompts for black-forest-labs/flux-3/video-upscale?
- Subject first: lead with the actor and action, then add environment, lighting and style ("an astronaut sprinting through a neon street in the rain, cinematic, shallow depth of field").
- Concrete nouns beat stacked adjectives: "85mm portrait lens, golden-hour backlight" works far better than "very beautiful, ultra high quality".
- Change one variable per iteration: pin the seed to reproduce a result, tweak a single phrase at a time so you know what actually moved the output.
- State negatives positively: instead of "no blur", ask for "sharp focus, crisp details".
How much does it cost?
Pay-per-use in credits. About $0.790 per typical run ($1 = 100 credits); the exact price varies with parameters like resolution or duration, and the playground shows the exact quote before you submit.
black-forest-labs/flux-3/video-upscale
black-forest-labs/flux-3/video-upscale
From $0.79 for 1 second at default creativity=1; $0.55/second at creativity=0. Billed by input duration, rounded up to whole seconds. FLUX Video Upscale enhances MP4 videos with source-faithful or creative detail reconstruction, configurable 1.5x to 3x scaling, and improved visual clarity for video restoration, social content, ads, and production workflows. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.
Parameters
| Parameter | Type | Required | Default | Limits / description |
|---|---|---|---|---|
video | string | Yes | — | MP4 video to upscale. Maximum duration: 20 seconds. Maximum file size: 50 MB. |
prompt | string | No | — | max 5000 chars; Optional description used to guide creative detail enhancement. Leave empty for a neutral upscale. |
upscale_factor | number | No | 2 | 1.5–3; step 0.1; Output scaling factor. The source aspect ratio is preserved. |
creativity | integer | No | 1 | 0–1; step 1; Use 0 for a source-faithful upscale or 1 for creative detail enhancement. |
Pricing
creativity=0: $0.55/second (55 credits); creativity=1 (default): $0.79/second (79 credits). Billable seconds = max(1, ceil(min(input video duration, 20))). Duration is measured from the input video; prompt and upscale_factor do not change the rate. Example: 5.2 seconds costs $3.30 or $4.74.
WaveSpeed standard list price; USD 1 = 100 credits. Account discounts are separate.
API
curl -X POST https://www.namifusion.com/api/v1/marketplace/run/black-forest-labs/flux-3/video-upscale \
-H "Authorization: Bearer $API_KEY" \
-H 'Content-Type: application/json' \
-d '{
"input": {
"video": "https://assets-public.namifusion.com/marketplace/videos/2026-04-14/88d6efad3763.mp4",
"upscale_factor": 2,
"creativity": 1
}
}'
curl 'https://www.namifusion.com/api/v1/marketplace/run/tasks/TASK_UUID' \
-H "Authorization: Bearer $API_KEY"
Submit returns task_uuid. Poll until completed or failed. Successful output: output.videos (URL array). This API is asynchronous and returns URLs.
FAQ
Can I try it for free first?+
Signup bonus credits can only be used on selected models, and eligibility may change. The playground shows the exact quote before submission.
Can I use the output commercially? Is there a watermark?+
Yes, outputs are yours to use commercially, and NamiFusion adds no platform watermark — subject to the Terms of Service and applicable law.
What is the content policy?+
Pornographic content, sexualized content involving a minor, unauthorized use of real people, deceptive impersonation, fraud and false endorsements are prohibited. Lawful, consensual, non-explicit adult themes may be permitted; see the Terms of Service.
How long does a black-forest-labs/flux-3/video-upscale task take?+
It depends on parameters — images usually take seconds, videos tens of seconds to minutes. The API returns a task_uuid for polling.
What are the resolution and duration limits?+
See the parameter table above — each model lists its available resolution and duration options there and in the playground.