OpenJutsu Object Swap API

by ComfyUI

Change a jacket, hair, product or the whole background in a clip, motion and sound kept

comfyui/openjutsu-object-swap/video-edit
  • Up to 1080p
  • Object Swap

Call it with the model name comfyui/openjutsu-object-swap/video-edit on POST /jobs/createTask, from $0.105.

Model namecomfyui/openjutsu-object-swap/video-edit
EndpointPOST https://api.popnow.ai/api/v1/jobs/createTask
# 1. Create the task. Keep the Idempotency-Key if you retry after a network error.
export IDEMPOTENCY_KEY="$(uuidgen)"
curl -X POST https://api.popnow.ai/api/v1/jobs/createTask \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $IDEMPOTENCY_KEY" \
  -d '{
  "model": "comfyui/openjutsu-object-swap/video-edit",
  "input": {
    "prompt": "A slow aerial shot drifting over a misty pine forest at sunrise",
    "video_url": "https://media.popnow.ai/effects/flower-bloom-1abd6efb.mp4",
    "edit_target": "example",
    "edit_mode": "change",
    "resolution": "768p"
  }
}'

# 2. Copy data.taskId from the response, then poll until state is succeeded, failed, canceled or expired.
TASK_ID="TASK_ID_FROM_RESPONSE"
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

The input is built from the schema below, so it passes validation as written. Change the prompt and links to your own.

Price

OptionUSD per second
resolution 480p$0.105
resolution 540p$0.119
resolution 768p$0.14
resolution 1080p$0.28

Billed in USD · Every option and its price: GET /models/comfyui/openjutsu-object-swap/video-edit

Limits

Resolutions
480p · 540p · 768p · 1080p
Prompt length (characters)
600
Largest upload
90 MB
Longest input clip
15 s

Parameters

These fields come from the same schema we check every request against. Fields that are not listed are rejected.

Some fields depend on each other (for example, at least one reference). The raw schema at the bottom has the exact rules.

  • video_urlstringRequiredChanges the price

    The clip to work on.

    Range
    Character count: 1 – … · video/mp4, video/webm, video/quicktime, video/x-m4v · ≤ 90 MB
  • edit_targetstringRequired

    A word or two for the thing to change, as it looks in the clip: hair, jacket, car. In background mode, this is what stays.

    Range
    Character count: 1 – 120
  • edit_modestringOptional

    Change it replaces the thing you named. Change the background keeps it and replaces everything around it.

    Default
    "change"
    Allowed values
    "change""background"
  • promptstringSometimes required

    Describe what you want to make.

    Range
    Character count: 0 – 600
  • reference_image_urlstringSometimes required

    The picture whose face or look gets carried over.

    Range
    Character count: 1 – … · image/jpeg, image/png, image/webp, image/gif
  • resolutionstringOptionalChanges the price

    Choose an available output size.

    Default
    "768p"
    Allowed values
    "480p""540p""768p""1080p"
  • seedintegerOptional

    Use the same seed and settings for more controlled comparisons.

    Range
    0 – 2147483647
Raw JSON Schema
{
  "additionalProperties": false,
  "properties": {
    "edit_mode": {
      "default": "change",
      "description": "change replaces the named thing. background keeps it and replaces everything around it.",
      "enum": [
        "change",
        "background"
      ],
      "type": "string"
    },
    "edit_target": {
      "description": "What to change, in a word or two as it looks in the clip: hair, jacket, car. Separate several with commas. In background mode, what stays.",
      "maxLength": 120,
      "minLength": 1,
      "type": "string"
    },
    "prompt": {
      "description": "What it becomes, such as \"a black leather biker jacket\"; in background mode, the new place. Required unless you send a reference image.",
      "maxLength": 600,
      "type": "string"
    },
    "reference_image_url": {
      "contentMediaType": [
        "image/jpeg",
        "image/png",
        "image/webp",
        "image/gif"
      ],
      "description": "Optional picture to copy the look from: an outfit, a hairstyle, a product or a place.",
      "minLength": 1,
      "type": "string"
    },
    "resolution": {
      "default": "768p",
      "description": "Output resolution. Sets the per-second rate.",
      "enum": [
        "480p",
        "540p",
        "768p",
        "1080p"
      ],
      "type": "string"
    },
    "seed": {
      "description": "Random seed for controlled comparisons, not a frame-identical guarantee.",
      "maximum": 2147483647,
      "minimum": 0,
      "type": "integer"
    },
    "video_url": {
      "contentMediaType": [
        "video/mp4",
        "video/webm",
        "video/quicktime",
        "video/x-m4v"
      ],
      "minLength": 1,
      "type": "string"
    }
  },
  "required": [
    "video_url",
    "edit_target"
  ],
  "type": "object",
  "anyOf": [
    {
      "required": [
        "prompt"
      ]
    },
    {
      "required": [
        "reference_image_url"
      ]
    }
  ]
}

Responses, polling and callbacks

Every model works the same way: create a task, then poll it or wait for a callback.

Price it first

cURL
curl -X POST https://api.popnow.ai/api/v1/jobs/quote \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "comfyui/openjutsu-object-swap/video-edit",
  "input": {
    "prompt": "A slow aerial shot drifting over a misty pine forest at sunrise",
    "video_url": "https://media.popnow.ai/effects/flower-bloom-1abd6efb.mp4",
    "edit_target": "example",
    "edit_mode": "change",
    "resolution": "768p"
  }
}'

Send the same request body to POST /jobs/quote to see the estimated and maximum USD charge before running. A quote does not run the task or charge your balance.

Accepted

HTTP
HTTP/1.1 202 Accepted

{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "task_01k3m8x9q2z4v7n5p6r8s0t1w3",
    "state": "queued"
  },
  "request_id": "req_example_create"
}

HTTP 202 means accepted: the maximum USD amount is held until settlement. When a task is accepted, we reserve the maximum quoted amount from your API balance. On completion, we charge for actual usage, never more than the hold, and release the remainder. If the task fails, the hold is released.

Check status

cURL
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

Poll every few seconds with backoff and stop once state is succeeded, failed, canceled or expired.

Finished task

JSON
{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "task_01k3m8x9q2z4v7n5p6r8s0t1w3",
    "model": "comfyui/openjutsu-object-swap/video-edit",
    "state": "succeeded",
    "output": {
      "assets": [
        {
          "url": "https://cdn.popnow.ai/tasks/task_01k3m8x9q2z4v7n5p6r8s0t1w3/output.mp4?signature=FROM_RESPONSE",
          "expiresAt": "2026-10-17T12:20:00Z",
          "mime": "video/mp4",
          "width": 1280,
          "height": 720,
          "durationSeconds": 5
        }
      ]
    },
    "settled": true
  },
  "request_id": "req_example_record"
}

Download from url before expiresAt. Need a fresh link later? Ask POST /common/download-url.

Verify a callback

Node.js
import { createHash, createHmac, timingSafeEqual } from "node:crypto";
import express from "express";

const app = express();
// express.raw keeps the exact bytes that were signed; express.json would not match.
app.post("/hooks/popnow", express.raw({ type: "application/json" }), (req, res) => {
  const timestamp = req.header("X-Webhook-Timestamp");
  const signature = req.header("X-Webhook-Signature") ?? "";
  const body = JSON.parse(req.body.toString("utf8"));
  const taskId = body.data?.taskId ?? body.task_id;
  const digest = createHash("sha256").update(req.body).digest("hex");
  const expected = createHmac("sha256", process.env.POPNOW_WEBHOOK_SECRET)
    .update(`${taskId}.${timestamp}.${digest}`)
    .digest("base64");
  const ok = expected.length === signature.length && timingSafeEqual(Buffer.from(expected), Buffer.from(signature));
  // Check the signature first, then reject anything older than five minutes.
  if (!ok || Math.abs(Date.now() / 1000 - Number(timestamp)) > 300) return res.status(401).end();
  res.status(200).end(); // answer fast, then fetch the task and store its files
});

With callBackUrl set, we post the finished task to you. Check the signature against the raw body before you trust it.

Send a local file

cURL
curl -X POST https://api.popnow.ai/api/v1/common/upload-url \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"contentType": "image/png", "bytes": 482113}'

# PUT the file bytes to data.uploadUrl with every header in data.headers, then commit it:
curl -X POST https://api.popnow.ai/api/v1/files/$FILE_ID/commit \
  -H "Authorization: Bearer $POPNOW_API_KEY"
# The commit returns a popnow://f/... reference. Put it in any image, video or
# audio field of the task input instead of a public https URL.

Public https links work as they are. Local files go through upload-url and commit first.