How to Use the Head Swap (Image) API: image to image integration guide (2026)
Learn how to call the Head Swap (Image) API on NamiFusion: parameters, pricing (from ≈$0.150) and runnable copy-paste code — try it in the playground first.
Head Swap (Image) is an image to image model by NamiFusion: Swap the head in a photo with the head from a reference image. Upload the target photo first, then the head reference. 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 $0.150.
TL;DR
· Task type: image to image, provided by NamiFusion
· Pricing: about $0.150 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: 1 (see the table below)
· No platform watermark; commercial use allowed (per the Terms of Service)
What can you build with Head Swap (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/namifusion/head-swap/image-edit" \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"input": {
"images": [
"https://example.com/input.jpg"
]
}
}'
# 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?
images (Images): required
How much does it cost?
Pay-per-use in credits. A typical run costs about $0.150 ($1 = 100 credits); the exact price varies with parameters like resolution or duration, and the playground shows the exact quote before you submit.
Head Swap (Image)
Head Swap (Image)
Swaps the head in a photo with the head from a reference image.
Input
| Field | Type | Required | Notes |
|---|---|---|---|
| images | array of exactly 2 image URLs | yes | [0] target photo, [1] head reference |
The order matters: upload the target photo first, then the head reference image second.
Output
images[0]: the edited image URL (1024x1024)
Pricing: 15 credits per image.
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?+
NamiFusion is an unfiltered engine: no arbitrary restrictions and NSFW-friendly, but illegal content and non-consensual use of real people are prohibited — see the Terms of Service.
How long does a Head Swap (Image) 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.