OpenJutsu Character Swap API

wavespeed-ai/openjutsu

Replace the main person in a video with the character from a single image, keeping the scene, motion and original audio.

Video Editing
Input

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Idle

$0.05per run·~20 / $1

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README

OpenJutsu Character Swap

OpenJutsu Character Swap replaces the main person in a video with a character from a single image. The scene, camera movement, performance and original audio are kept; only the person changes.

Why Choose This?

  • One image, one swap Provide a source video and a character image. The most prominent person in the video is replaced by the character.

  • Performance preserved Body motion, timing and framing follow the source video, so the result stays in sync with the original sound.

  • Original audio kept The soundtrack of the source video is carried over to the result.

  • Up to 15 seconds The result follows the length of your video, up to 15 seconds. Longer videos use their first 15 seconds.

Parameters

ParameterRequiredDescription
videoYesURL of the source video, at least 2 seconds. Use a single shot with a person visible in the first frame. The result follows its length, up to 15 seconds.
imageYesURL of the character image that replaces the person.
resolutionNoOutput resolution: 480p or 768p. Default: 768p.
seedNoRandom seed for generation. A negative value means a random seed will be used.

Tips

  • Use a source video with one continuous shot and a clearly visible person. Videos without a person are rejected.
  • If several people appear, only the most prominent one is replaced.
  • The result can be slightly shorter than your video (by up to about 10%). Billing follows the length of your video.

Pricing

Billing duration: The length of your input video is rounded up to whole seconds. The minimum billed duration is 3 seconds; shorter videos are billed as 3 seconds. Videos longer than 15 seconds are billed as 15 seconds, and only their first 15 seconds are used.

The price depends on the billed length and the resolution. The character image adds a flat fee.

ResolutionPrice per secondMax billed length
768p0.20 USD15 s
480p0.10 USD15 s

A flat 0.02 USD is added to every run for the character image.

Billing rules

  • Billed duration = input video length rounded up to whole seconds, clamped to 3-15 seconds.
  • 768p: 0.20 USD per billed second.
  • 480p: half of 768p, 0.10 USD per billed second.
  • Total = billed seconds x rate per second + 0.02 USD.

So, for example:

  • 10 s video at 768p: 10 x 0.20 + 0.02 = 2.02 USD
  • 10 s video at 480p: 10 x 0.10 + 0.02 = 1.02 USD
  • 15 s video at 768p: 15 x 0.20 + 0.02 = 3.02 USD
  • 15 s video at 480p: 15 x 0.10 + 0.02 = 1.52 USD
  • 2 s video at 768p (billed as 3 s): 3 x 0.20 + 0.02 = 0.62 USD
  • 30 s video at 768p (billed as 15 s): 3.02 USD
Note:This website uses AI models provided by third parties. Documentation prices are for reference and may be outdated. The Generate button shows an estimate; the final task charge prevails.

Openjutsu API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/wavespeed-ai/openjutsu with your input as JSON. The endpoint returns a prediction id. Start polling the result endpoint around every 2 seconds, increase the interval for long-running tasks, and stop on any terminal status. On completed, read output values from data.outputs. Examples for Openjutsu below.

HTTP example
set -euo pipefail

: "${WAVESPEED_API_KEY:?Set WAVESPEED_API_KEY}"

REQUEST_BODY=$(cat <<'JSON'
{
    "video": "https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4",
    "image": "https://interactive-examples.mdn.mozilla.net/media/cc0-images/painted-hand-298-332.jpg",
    "resolution": "768p"
}
JSON
)

# 1. Submit the prediction.
SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/openjutsu" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d "$REQUEST_BODY")

TASK=$(printf '%s' "$SUBMIT_RESPONSE" | jq 'if has("data") then .data else . end')
PREDICTION_ID=$(printf '%s' "$TASK" | jq -r '.id')
if [ -z "$PREDICTION_ID" ] || [ "$PREDICTION_ID" = "null" ]; then
  printf 'Submission response did not contain a prediction id
' >&2
  exit 1
fi
RESULT_URL="https://api.wavespeed.ai/api/v3/predictions/$PREDICTION_ID/result"

# 2. Poll until the prediction finishes.
while true; do
  RESPONSE=$(curl --silent --show-error --fail-with-body "$RESULT_URL" \
    -H "Authorization: Bearer $WAVESPEED_API_KEY")
  RESULT=$(printf '%s' "$RESPONSE" | jq 'if has("data") then .data else . end')
  STATUS=$(printf '%s' "$RESULT" | jq -r '.status')
  case "$STATUS" in
    completed) printf '%s\n' "$RESULT" | jq '.outputs'; break ;;
    failed|cancelled|timeout|deleted) printf '%s\n' "$RESULT" | jq . >&2; exit 1 ;;
    *) sleep 2 ;;
  esac
done
Node.js example
const submitUrl = "https://api.wavespeed.ai/api/v3/wavespeed-ai/openjutsu";
const apiKey = process.env.WAVESPEED_API_KEY;
if (!apiKey) throw new Error('Set WAVESPEED_API_KEY');

async function requestJson(url, options = {}) {
  const response = await fetch(url, options);
  if (!response.ok) throw new Error(await response.text());
  return response.json();
}

// 1. Submit the prediction.
const body = await requestJson(submitUrl, {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${apiKey}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
        "video": "https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4",
        "image": "https://interactive-examples.mdn.mozilla.net/media/cc0-images/painted-hand-298-332.jpg",
        "resolution": "768p"
}),
});
const task = body.data ?? body;
if (!task.id) throw new Error("Submission response did not contain a prediction id");
const resultUrl = `https://api.wavespeed.ai/api/v3/predictions/${task.id}/result`;

// 2. Poll until the prediction finishes.
while (true) {
  const resultBody = await requestJson(resultUrl, {
    headers: { "Authorization": `Bearer ${apiKey}` },
  });
  const result = resultBody.data ?? resultBody;
  if (result.status === "completed") {
    console.log(result.outputs);
    break;
  }
  if (["failed", "cancelled", "timeout", "deleted"].includes(result.status)) throw new Error(JSON.stringify(result));
  await new Promise(resolve => setTimeout(resolve, 2000));
}
Python example
import json
import os
import time
from urllib.request import Request, urlopen

api_key = os.environ["WAVESPEED_API_KEY"]
headers = {"Authorization": f"Bearer {api_key}", "Content-Type": "application/json"}
payload = {
    "video": "https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4",
    "image": "https://interactive-examples.mdn.mozilla.net/media/cc0-images/painted-hand-298-332.jpg",
    "resolution": "768p"
}

def request_json(url, data=None):
    request = Request(url, data=data, headers=headers, method="POST" if data else "GET")
    with urlopen(request) as response:
        return json.load(response)

# 1. Submit the prediction.
body = request_json("https://api.wavespeed.ai/api/v3/wavespeed-ai/openjutsu", json.dumps(payload).encode())
task = body.get("data", body)
if not task.get("id"):
    raise RuntimeError("Submission response did not contain a prediction id")
result_url = f"https://api.wavespeed.ai/api/v3/predictions/{task['id']}/result"

# 2. Poll until the prediction finishes.
while True:
    result_body = request_json(result_url)
    result = result_body.get("data", result_body)
    status = result.get("status")
    if status == "completed":
        print(result.get("outputs", []))
        break
    if status in {"failed", "cancelled", "timeout", "deleted"}:
        raise RuntimeError(result)
    time.sleep(2)

Openjutsu API — Frequently asked questions

What is the Openjutsu API?

Openjutsu is a WaveSpeedAI model for video editing, exposed as a REST API on WaveSpeedAI. Replace the main person in a video with the character from a single image, keeping the scene, motion and original audio. You can call it programmatically or try it from the playground above.

How do I call the Openjutsu 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 result endpoint starting around every 2 seconds, increase the interval for long-running tasks, and stop on any terminal status. The playground generates Python, JavaScript, and cURL examples for submitting requests and polling results. Full request/response shape is documented at https://wavespeed.ai/docs/docs-api/wavespeed-ai/openjutsu.

How much does Openjutsu cost per run or per second?

Openjutsu starts at $0.05 per run or per second. 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 Openjutsu accept?

Key inputs: `image`, `video`, `resolution`, `seed`. 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/wavespeed-ai/openjutsu.

How do I get started with the Openjutsu API?

Sign up for a free WaveSpeedAI account to claim starter credits, copy your API key from /accesskey, then call the endpoint shown in the API tab of the playground. The playground also auto-generates a code sample in Python, JavaScript, or cURL for the parameters you've set.

Can I use Openjutsu outputs commercially?

Commercial usage rights depend on the model's license, set by its provider (WaveSpeedAI). Check the provider's applicable terms and WaveSpeedAI's Terms of Service before commercial use.

llms.txt — wavespeed-ai/openjutsu for AI agents and LLMs