Flux-2 - Pro Image to Image

This page is generated from the upstream official OpenAPI documentation. Endpoints, parameters and examples match the official docs; brand and API domain are replaced with ModelFold.

Endpoint

POST /jobs/createTask

Full URL: https://ai.modelfold.online/v1/jobs/createTask

Authentication: every request must include the Authorization: Bearer <API_KEY> header.

Image generation by flux-2/pro-image-to-image

The output format is not fixed: results may be PNG or JPEG.

Query Task Status

After submitting a task, use the unified query endpoint to check progress and retrieve results:

Get Task Details — Learn how to query task status and retrieve generation results

TIP

For production use, we recommend using the callBackUrl parameter to receive automatic notifications when generation completes, rather than polling the status endpoint.

Market Overview — Explore all available models
Common API — Check credits and account usage

Request Parameters

Body (application/json)

Parameter	Type	Required	Description
`model`	`string`	Yes	The model name to use for generation. Required field. - Must be `flux-2/pro-image-to-image` for this endpoint Default：`"flux-2/pro-image-to-image"`。 Allowed values：`flux-2/pro-image-to-image`。示例：`flux-2/pro-image-to-image`。
`callBackUrl`	`string`	No	The URL to receive generation task completion updates. Optional but recommended for production use. - System will POST task status and results to this URL when generation completes - Callback includes generated content URLs and task information - Your callback endpoint should accept POST requests with JSON payload containing results - Alternatively, use the Get Task Details endpoint to poll task status - To ensure callback security, see Webhook Verification Guide for signature verification implementation 示例：`https://your-domain.com/api/callback`。
`input`	`object`	No	Input parameters for the generation task
`input.input_urls`	`array<string>`	Yes	Input reference images (1-8 images). (File URL after upload, not file content; Accepted types: image/jpeg, image/png, image/webp; Max size: 10.0MB)
`input.prompt`	`string`	Yes	Must be between 3 and 5000 characters. (Max length: 5000 characters) 示例：`The jar in image 1 is filled with capsules exactly same as image 2 with the exact logo`。
`input.aspect_ratio`	`string`	Yes	Required. Aspect ratio for the generated image. Select 'auto' to match the first input image ratio (requires input image). Allowed values：`1:1` / `4:3` / `3:4` / `16:9` / `9:16` / `3:2` / `2:3` / `auto`。示例：`1:1`。
`input.resolution`	`string`	Yes	Required. Output image resolution. Allowed values：`1K` / `2K`。示例：`1K`。
`input.nsfw_checker`	`boolean`	No	Defaults to false. When false, no additional content filtering is applied and results are returned directly by the model.

Request Example

bash

curl -X POST "https://ai.modelfold.online/v1/jobs/createTask" \
  -H "Authorization: Bearer $MODELFOLD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "flux-2/pro-image-to-image",
  "callBackUrl": "https://your-domain.com/api/callback",
  "input": {
    "input_urls": [
      "https://static.aiquickdraw.com/tools/example/1764235041265_kjJ2sTMR.png",
      "https://static.aiquickdraw.com/tools/example/1764235045490_9SjAUr4Z.png"
    ],
    "prompt": "The jar in image 1 is filled with capsules exactly same as image 2 with the exact logo",
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "nsfw_checker": false
  }
}'

json

{
  "model": "flux-2/pro-image-to-image",
  "callBackUrl": "https://your-domain.com/api/callback",
  "input": {
    "input_urls": [
      "https://static.aiquickdraw.com/tools/example/1764235041265_kjJ2sTMR.png",
      "https://static.aiquickdraw.com/tools/example/1764235045490_9SjAUr4Z.png"
    ],
    "prompt": "The jar in image 1 is filled with capsules exactly same as image 2 with the exact logo",
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "nsfw_checker": false
  }
}

Response

200 — Request successful

json

{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "task_flux-2_1765174753676"
  }
}

Callback

onImageGenerated

Callback URL: {$request.body#/callBackUrl} (the callBackUrl in the request body).

Sent when the task succeeds or fails.

Callback body parameters

参数	类型	必填	说明
`code`	`integer`	否	200: success. 501: failure; see data.failCode and data.failMsg. Allowed values：`200` / `501`。示例：`200`。
`msg`	`string`	否	Status message 示例：`Playground task completed successfully.`。
`data`	`object`	否	—
`data.completeTime`	`integer`	否	Task completion time, represented as a Unix timestamp in milliseconds 示例：`1786430054000`。
`data.costTime`	`integer`	否	Processing time in seconds. Present on both success and failure callbacks. 示例：`29`。
`data.createTime`	`integer`	否	Task creation time, represented as a Unix timestamp in milliseconds 示例：`1786430015000`。
`data.creditsConsumed`	`number`	否	Credits consumed by the task; 0 for failed tasks. 示例：`5`。
`data.model`	`string`	否	Image-to-image model used for the task 示例：`flux-2/pro-image-to-image`。
`data.param`	`string`	否	Parameters submitted when creating the task, in JSON string format 示例：`{"input":"{\"aspect_ratio\":\"4:3\",\"prompt\":\"Change the man into the outfit shown in picture two, full-body photo.\",\"resolution\":\"1K\",\"input_urls\":[\"https://static.aiquickdraw.com/tools/example/1767778229847_vlvnwO6j.png\",\"https://static.aiquickdraw.com/tools/example/1767778235468_hdL7eCh2.png\"],\"nsfw_checker\":true}","callBackUrl":"https://your-domain.com/api/callback","model":"flux-2/pro-image-to-image"}`。
`data.resultJson`	`string`	否	Image generation result in JSON string format. resultUrls contains the list of generated image URLs. Present only when state is success. 示例：`{"resultUrls":["https://tempfile.aiquickdraw.com/h/675e5433b93713dfdba75385bafc3f18_1786430052.png"]}`。
`data.state`	`string`	否	Task status Allowed values：`success` / `fail`。示例：`success`。
`data.taskId`	`string`	否	Task ID 示例：`675e5433b93713dfdba75385bafc3f18`。
`data.updateTime`	`integer`	否	Use completeTime as the completion time; updateTime may equal createTime. 示例：`1786430054000`。
`data.failCode`	`string`	否	Failure code, a numeric string such as "400" or "500". Present only when state is fail. 示例：`500`。
`data.failMsg`	`string`	否	Failure reason. Present only when state is fail. 示例：`<error detail>`。

Success

json

{
  "code": 200,
  "msg": "Playground task completed successfully.",
  "data": {
    "taskId": "675e5433b93713dfdba75385bafc3f18",
    "model": "flux-2/pro-image-to-image",
    "state": "success",
    "param": "{\"input\":\"{\\\"aspect_ratio\\\":\\\"4:3\\\",\\\"prompt\\\":\\\"Change the man into the outfit shown in picture two, full-body photo.\\\",\\\"resolution\\\":\\\"1K\\\",\\\"input_urls\\\":[\\\"https://static.aiquickdraw.com/tools/example/1767778229847_vlvnwO6j.png\\\",\\\"https://static.aiquickdraw.com/tools/example/1767778235468_hdL7eCh2.png\\\"],\\\"nsfw_checker\\\":true}\",\"callBackUrl\":\"https://your-domain.com/api/callback\",\"model\":\"flux-2/pro-image-to-image\"}",
    "resultJson": "{\"resultUrls\":[\"https://tempfile.aiquickdraw.com/h/675e5433b93713dfdba75385bafc3f18_1786430052.png\"]}",
    "completeTime": 1786430054000,
    "createTime": 1786430015000,
    "costTime": 29,
    "creditsConsumed": 5,
    "updateTime": 1786430054000
  }
}

Failure

json

{
  "code": 501,
  "msg": "Playground task failed.",
  "data": {
    "taskId": "675e5433b93713dfdba75385bafc3f18",
    "model": "flux-2/pro-image-to-image",
    "state": "fail",
    "param": "{\"input\":\"{\\\"aspect_ratio\\\":\\\"4:3\\\",\\\"prompt\\\":\\\"Change the man into the outfit shown in picture two, full-body photo.\\\",\\\"resolution\\\":\\\"1K\\\",\\\"input_urls\\\":[\\\"https://static.aiquickdraw.com/tools/example/1767778229847_vlvnwO6j.png\\\",\\\"https://static.aiquickdraw.com/tools/example/1767778235468_hdL7eCh2.png\\\"],\\\"nsfw_checker\\\":true}\",\"callBackUrl\":\"https://your-domain.com/api/callback\",\"model\":\"flux-2/pro-image-to-image\"}",
    "failCode": "500",
    "failMsg": "<error detail>",
    "completeTime": 1786430054000,
    "createTime": 1786430015000,
    "costTime": 29,
    "creditsConsumed": 0,
    "updateTime": 1786430054000
  }
}

Flux-2 - Pro Image to Image ​

Endpoint ​

Query Task Status ​

Related Resources ​

Request Parameters ​

Body (application/json) ​

Request Example ​

Response ​

200 — Request successful ​

Callback ​

onImageGenerated ​

Flux-2 - Pro Image to Image

Endpoint

Query Task Status

Related Resources

Request Parameters

Body (application/json)

Request Example

Response

200 — Request successful

Callback

onImageGenerated