Hair Swap | Trending Video Effects API

Hair Swap Effect

Requirements

Number of Images

Mandatory
Only one image upload supported

Number of People

Single person/animal or dual person/animal supported

Image Requirements

Single-person front-facing upper-body pose for best results

Prompt

Mandatory
Format should remain unchanged as much as possible
You may modify the "{color_English_name}" and "{hairstyle_English_name}" content without altering the structure

Supported Hairstyles

Half-up Princess Hairstyle
Long Hair
Curly Hair
Airy Style
Twin Tails
Sleek Straight Hair
Slightly Curled Short Hair
Curly Wool Hair
Relaxed Long Curls
Fishtail Perm

Supported Colors

Original Hair Color
Raspberry Purple
Milk Tea Gold
Dirty Orange
Sweet Cherry Pink
Linen Brown
Hatsune Color

Effect Boundaries

When the original hairstyle differs significantly from the transformed hairstyle, errors in hairstyle changes may occur

Best Practices

Use clear, front-facing photos
Ensure subject's upper body is clearly visible
Choose hairstyles that are not too different from the original
Keep the default prompt structure
Use appropriate color and hairstyle combinations

Hair Swap API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/video-effects/hair-swap with your input as JSON. The endpoint returns a prediction id; poll the prediction endpoint until status flips to completed, then read the output URL from data.outputs[0]. Examples for Hair Swap below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/video-effects/hair-swap" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d '{
    "image": "https://example.com/your-input.jpg"
}'

# Response includes a prediction id. Poll for the result:
curl -X GET "https://api.wavespeed.ai/api/v3/predictions/{request_id}/result" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY"

# When status is "completed", read the output from data.outputs[0].

Node.js example

// npm install wavespeed
const WaveSpeed = require('wavespeed');

const client = new WaveSpeed(); // reads WAVESPEED_API_KEY from env

const result = await client.run("video-effects/hair-swap", {
        "image": "https://example.com/your-input.jpg"
});

console.log(result.outputs[0]); // → URL of the generated output

Python example

# pip install wavespeed
import wavespeed

output = wavespeed.run(
    "video-effects/hair-swap",
    {
    "image": "https://example.com/your-input.jpg"
}
)

print(output["outputs"][0])  # → URL of the generated output

Hair Swap API — Frequently asked questions

What is the Hair Swap API?

Hair Swap is a Video Effects model for AI inference, exposed as a REST API on WaveSpeedAI. Hair Swap turns photos into natural-looking hairstyle transformation videos with realistic motion and preserved emotion. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing. You can call it programmatically or try it from the playground above.

How do I call the Hair Swap API?

POST your input parameters to the model's REST endpoint (shown in the API tab of this playground) with your WaveSpeedAI API key in the Authorization header. Submission returns a prediction ID; poll the prediction endpoint until status flips to "completed", then read the output URL from the result. The playground generates a ready-to-paste code sample in Python, JavaScript, or cURL for whatever inputs you've set. Full request/response shape is documented at https://wavespeed.ai/docs/docs-api/video-effects/video-effects-hair-swap.

How much does Hair Swap cost per run?

Hair Swap starts at $0.20 per run. That figure is the base price — the final charge scales with the parameters you set in the form (output size, length, count, references, or whatever knobs this model exposes), so a higher-quality or larger output costs more than a minimal one. The exact cost for your current input is shown live next to the Generate button before you submit, and the actual per-call charge is recorded on the prediction afterwards.

What inputs does Hair Swap accept?

Key inputs: `image`. The full JSON schema (types, defaults, allowed values) is rendered above the Generate button and mirrored in the API reference at https://wavespeed.ai/docs/docs-api/video-effects/video-effects-hair-swap.

How long does Hair Swap take to generate?

Average end-to-end generation time on WaveSpeedAI is around 62 seconds per request — measured across recent runs. Queue time scales with global demand; live status is visible in the prediction record.

Can I use Hair Swap outputs commercially?

Commercial usage rights depend on the model's license, set by its provider (Video Effects). The license summary appears on the model card above; see WaveSpeedAI's Terms of Service for platform-level conditions.

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