Qwen 2 Image

Overview

Qwen 2 Image is an asynchronous text-to-image API. It supports standard and pro generation modes, multiple aspect ratios, prompt extension, optional negative prompts, and up to 6 images per task.

Capability	Value
Model ID	`qwen-2-image`
Modes	`text-to-image`, `text-to-image-pro`
Default mode	`text-to-image`
Prompt length	1-800 characters
Negative prompt	Optional, up to 500 characters
Images per task	`num_images` defaults to `1`; range `1-6`
Aspect ratios	`1:1`, `3:4`, `4:3`, `9:16`, `16:9`
Prompt extension	`prompt_extend`, default `true`
Watermark	`watermark`, default `false`

Endpoint and authentication

Base URL:

https://api.apixo.ai/api/v1

Method	Endpoint	Purpose
`POST`	`/generateTask/qwen-2-image`	Submit a text-to-image task
`GET`	`/statusTask/qwen-2-image?taskId={taskId}`	Poll task status and retrieve results

All requests require your APIXO API key:

Authorization: Bearer YOUR_API_KEY

Submit requests also require:

Content-Type: application/json

Copy-paste async quickstart

curl -X POST "https://api.apixo.ai/api/v1/generateTask/qwen-2-image" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "input": {
      "mode": "text-to-image-pro",
      "prompt": "a premium poster for a bookstore event, crisp typography, elegant layout",
      "negative_prompt": "blurry text, distorted letters, low resolution",
      "aspect_ratio": "16:9",
      "num_images": 2,
      "prompt_extend": true,
      "watermark": false
    }
  }'

Successful response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678"
  }
}

Save the taskId; you need it to poll for the final result.

Poll for result

curl -X GET "https://api.apixo.ai/api/v1/statusTask/qwen-2-image?taskId=task_12345678" \
  -H "Authorization: Bearer YOUR_API_KEY"

Success response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "success",
    "resultJson": "{\"resultUrls\":[\"https://file.apixo.ai/image.png\"]}",
    "createTime": 1767965610929,
    "completeTime": 1767965652317,
    "costTime": 41388
  }
}

Parse resultJson after state becomes success:

const payload = JSON.parse(data.resultJson);
const imageUrls = payload.resultUrls;

Request body

Standard text-to-image

{
  "request_type": "async",
  "input": {
    "mode": "text-to-image",
    "prompt": "a minimalist product poster for wireless earbuds, clean layout",
    "aspect_ratio": "4:3",
    "num_images": 1,
    "prompt_extend": true,
    "watermark": false
  }
}

Pro text-to-image

{
  "request_type": "callback",
  "callback_url": "https://your-server.com/webhooks/apixo",
  "input": {
    "mode": "text-to-image-pro",
    "prompt": "a high-end brand key visual with readable headline text and premium lighting",
    "negative_prompt": "blurred typography, misspelled words, jagged edges",
    "aspect_ratio": "9:16",
    "num_images": 2,
    "seed": 123456
  }
}

Parameters

request_type

string

default:"async"

required

Result delivery mode. Use async for polling with statusTask, or callback for webhook delivery.

callback_url

string

Required when request_type is callback. Must be a callback URL that can receive the final task payload. See Webhooks.

input

object

required

Qwen 2 Image input parameters.

Show properties

mode

string

default:"text-to-image"

Generation mode. Supported values: text-to-image, text-to-image-pro. If omitted, the backend defaults to text-to-image.

prompt

string

required

Prompt text. Must be a non-empty string and cannot exceed 800 characters.

negative_prompt

string

Optional negative prompt. Maximum length is 500 characters.

aspect_ratio

string

default:"1:1"

Output aspect ratio. Supported values: 1:1, 3:4, 4:3, 9:16, 16:9.

num_images

integer

default:"1"

Number of output images. Accepts integer or numeric string input. Supported range: 1-6.

prompt_extend

boolean

default:"true"

Whether to enable prompt extension.

watermark

boolean

default:"false"

Whether to add a watermark to generated images.

seed

integer

Optional random seed. Supported range: 0-2147483647.

Response format

Submit task response

POST /generateTask/qwen-2-image returns a task ID when the task is accepted:

code

integer

API status code. 200 means the task was accepted.

message

string

Human-readable status message.

data.taskId

string

Unique task identifier used with the status endpoint.

Status response fields

taskId

string

Unique task identifier.

state

string

Current task state: pending, processing, success, or failed.

resultJson

string

JSON string containing generated image URLs in resultUrls. Present when state is success.

failCode

string

Machine-readable failure code. Present when state is failed.

failMsg

string

Human-readable failure message. Present when state is failed.

createTime

integer

Task creation timestamp in Unix milliseconds.

completeTime

integer

Task completion timestamp in Unix milliseconds. Present after completion.

costTime

integer

Processing duration in milliseconds when available.

Webhook callback mode

Use callback mode when your backend should receive the final result automatically instead of polling.

curl -X POST "https://api.apixo.ai/api/v1/generateTask/qwen-2-image" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "callback",
    "callback_url": "https://your-server.com/webhooks/apixo",
    "input": {
      "mode": "text-to-image-pro",
      "prompt": "a premium campaign poster with readable headline text",
      "aspect_ratio": "16:9",
      "num_images": 1
    }
  }'

See Webhooks for delivery requirements and retry behavior.

Billing

Qwen 2 Image is billed per generated image.

Mode	APIXO price
`text-to-image`	`$0.03 / image`
`text-to-image-pro`	`$0.07 / image`

Billing behavior:

precharge = requested_num_images * unit_price_for_mode
final_charge = successful_images * unit_price_for_mode
refund = precharge - final_charge (if partial failure)

For current route and market comparison pricing, see Pricing.

Latency and polling

Qwen 2 Image tasks are asynchronous. Actual latency varies by prompt complexity, requested image count, and queue load.

Use case	Recommended first poll	Poll interval
Standard generation	10s after task creation	5s-10s
Pro mode or multiple images	10s-15s after task creation	5s-10s

For production queues or batches, use callback mode to avoid frequent polling.

Rate limits and concurrency can vary by account, API key, and route. If you receive 429, slow down requests and retry with backoff. For account-level details, see System APIs.

Errors and troubleshooting

HTTP errors

Code	Meaning	What to do
`400`	Invalid request body, parameter type, or value	Fix the request before retrying
`401`	Missing or invalid API key	Check the `Authorization` header
`402`	Insufficient balance or quota	Add balance or switch account/key
`403`	Key or route cannot access the model	Check permissions and route strategy
`404`	Task not found	Verify the `taskId` and model ID
`429`	Rate limit or concurrency limit reached	Retry with exponential backoff
`500`	Server or unmapped model error	Retry with backoff
`502`	Model service error	Retry with backoff
`504`	Model service timeout	Retry or use callback mode for long-running jobs

Request validation

Condition	Backend behavior
Invalid `mode`	Returns `Invalid mode type. Supported: text-to-image, text-to-image-pro`
Missing or empty `prompt`	Returns a missing-parameter or validation error
Prompt exceeds `800` characters	Returns a length error
Invalid `num_images`	Returns `The parameter {{num_images}} must be between 1 and 6.`
Invalid `aspect_ratio`	Returns the supported aspect-ratio list
Invalid `prompt_extend` or `watermark`	Returns a boolean type error
Invalid `seed`	Returns the supported seed range

See Error Codes for the full error reference.

​Overview

​Endpoint and authentication

​Copy-paste async quickstart

​Poll for result

​Request body

​Standard text-to-image

​Pro text-to-image

​Parameters

​Response format

​Submit task response

​Status response fields

​Webhook callback mode

​Billing

​Latency and polling

​Errors and troubleshooting

​HTTP errors

​Request validation

​Related links

Overview

Endpoint and authentication

Copy-paste async quickstart

Poll for result

Request body

Standard text-to-image

Pro text-to-image

Parameters

Response format

Submit task response

Status response fields

Webhook callback mode

Billing

Latency and polling

Errors and troubleshooting

HTTP errors

Request validation

Related links