How to Use the Qwen Image 2.1 Pro Text to Image API: text to image integration guide (2026)

Qwen Image 2.1 Pro Text to Image is a text to image model by Alibaba: Generate 1–6 images from a text prompt, with optional prompt expansion and thinking mode. On NamiFusion you can try it in the playground (exact quote shown before you submit), then call it through one unified REST API — about $0.040 per typical run.

TL;DR

· Task type: text to image, provided by Alibaba

· Pricing: about $0.040 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: 7 (see the table below)

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

What can you build with Qwen Image 2.1 Pro Text to Image?

Social media visuals and covers: batch-generate on-theme images and schedule them straight away.

E-commerce and ad creatives: product scenes, banner backgrounds, and multi-variant visuals for A/B tests.

Concept art and ideation: characters, environments and style boards, iterated cheaply and fast.

Pipeline chaining: outputs feed directly into image-to-video or face swap as source material.

How do you call this API?

1. Sign up on NamiFusion and create a key on the API Keys page (signup bonus credits can only be used on selected models).
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/alibaba/qwen-image-2.1-pro/text-to-image" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "input": {
    "prompt": "A cinematic portrait of a young woman standing in a neon-lit rainy street in Shanghai at night, wearing a modern black trench coat and holding a transparent umbrella, realistic skin texture, dramatic reflections on wet pavement, soft rim lighting, detailed background signage, no text in the image, ultra-detailed, high contrast, professional photography style",
    "n": 1,
    "size": "2048*2048",
    "prompt_extend": true,
    "prompt_extend_mode": "direct",
    "enable_thinking": true,
    "seed": 12345
  }
}'

# 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): required

n (Number of Images): optional, default 1

size (Size): optional

prompt_extend (Prompt Extend): optional, default true

prompt_extend_mode (Prompt Extend Mode): optional, default "direct"

enable_thinking (Thinking Mode): optional, default true

seed (Seed): optional

How do you write prompts for Qwen Image 2.1 Pro Text to Image?

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. About $0.040 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.