How to Use the Kling 3.0 API: text to video integration guide (2026)

Kling 3.0 is a text to video model by Kling: Kling 3.0 delivers high-quality text-to-video generation with smooth motion, cinematic visuals, accurate prompt adherence, and native audio for ready-to-share clips. Ready-to-use REST inference API, best performance, no cold starts, 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 — a typical run costs about $0.630.

TL;DR

· Task type: text to video, provided by Kling

· Pricing: about $0.630 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: 11 (see the table below)

· No platform watermark; commercial use allowed (per the Terms of Service)

What can you build with Kling 3.0?

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?

1. Sign up on NamiFusion and create a key on the API Keys page (free credits on signup).

2. Submit a task with the cURL example below, passing your key as a Bearer token.

3. 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/kwaivgi/kling-v3.0/text-to-video" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "input": {
    "prompt": "A futuristic cityscape at sunset with flying cars and glowing skyscrapers.",
    "negative_prompt": "Crowded streets, dull colors, and broken buildings.",
    "duration": 10,
    "resolution": "720P",
    "aspect_ratio": "16:9",
    "cfg_scale": 0.7,
    "sound": true,
    "shot_type": "intelligence"
  }
}'

# 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

negative_prompt (Negative Prompt): optional

duration (Duration): optional, default 5

resolution (Generation Mode): optional, default "720P"

aspect_ratio (Aspect Ratio): optional, default "16:9"

cfg_scale (Cfg Scale): optional, default 0.5

sound (Sound): optional

element_list (Element List): optional

multi_shot (Multi Shot): optional

shot_type (Shot Type): optional

multi_prompt (Multi Prompt): optional

How do you write prompts for Kling 3.0?

1. 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").

2. Concrete nouns beat stacked adjectives: "85mm portrait lens, golden-hour backlight" works far better than "very beautiful, ultra high quality".

3. 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.

4. State negatives positively: instead of "no blur", ask for "sharp focus, crisp details".

How much does it cost?

Pay-per-use in credits. A typical run costs about $0.630 ($1 = 100 credits); the exact price varies with parameters like resolution or duration, and the playground shows the exact quote before you submit.