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by Alibaba

Up to six detailed 2K images from one prompt

alibaba/qwen-image-2.1-pro/text-to-imageFrom 6 creditsper image · $0.06
  • Up to 2K
  • Up to 10 reference images
  • 15 aspect ratios
  • Up to 6 per run
  • Create Image
  • Edit Image

Call it with the model name alibaba/qwen-image-2.1-pro/text-to-image on POST /jobs/createTask, from 6 credits per image ($0.06). New accounts get 30 free credits to try it in the Playground first.

Model namealibaba/qwen-image-2.1-pro/text-to-image
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": "alibaba/qwen-image-2.1-pro/text-to-image",
  "input": {
    "prompt": "A ceramic teapot on a linen cloth, soft window light, muted palette",
    "aspect_ratio": "1:1",
    "resolution": "2k",
    "num_outputs": 1
  }
}'

# 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

OptionCredits per image≈ USD
Standard5.4$0.054

1 credit = $0.01 · Every option and its price: GET /models/alibaba/qwen-image-2.1-pro/text-to-image

Each task is rounded up to whole credits, so one run at the lowest tier costs 6 credits per image ($0.06).

Limits

Resolutions
1K · 1.5K · 2K
Aspect ratios
1:1 · 16:9 · 9:16 · 4:3 · 3:4 · 3:2 +9
Outputs per call
1–6
Prompt length (characters)
5,000

Parameters

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

  • promptstringRequired

    Describe the subject, composition, lighting, and any wording to render. There is no negative prompt: write what to leave out directly in the prompt.

    Range
    1 – 5000 chars
  • aspect_ratiostringOptional

    The shape of the frame: wide, square or tall.

    Default
    "1:1"
    Allowed values
    "1:1""16:9""9:16""4:3""3:4""3:2""2:3""21:9""9:21""2:1""1:2""3:1""1:3""5:4""4:5"
  • resolutionstringOptional

    Output size. Bigger sizes look sharper and cost more.

    Default
    "2k"
    Allowed values
    "1k""1.5k""2k"
  • num_outputsintegerOptionalChanges the price

    How many results to make in one go.

    Default
    1
    Range
    1 – 6
  • enable_prompt_expansionbooleanOptional

    Lets the model add detail to a short prompt.

    Default
    false
  • enable_thinkingbooleanOptional

    Spend extra reasoning on the rewrite for better images, at the cost of a longer wait. Only works while prompt expansion is on.

    Default
    true
  • prompt_optimization_modestringOptional

    How prompt expansion rewrites the brief: direct is a single pass that suits most prompts; agent is a multi-step rewrite with finer detail.

    Default
    "direct"
    Allowed values
    "direct""agent"
  • seedintegerOptional

    Reuse the same number to get a repeatable result.

    Range
    0 – 2147483647
Raw JSON Schema
{
  "type": "object",
  "required": [
    "prompt"
  ],
  "properties": {
    "seed": {
      "type": "integer",
      "maximum": 2147483647,
      "minimum": 0,
      "description": "Random seed for controlled comparisons."
    },
    "prompt": {
      "type": "string",
      "maxLength": 5000,
      "minLength": 1,
      "description": "Describe the subject, composition, lighting, and any wording to render. There is no negative prompt: write what to leave out directly in the prompt."
    },
    "resolution": {
      "enum": [
        "1k",
        "1.5k",
        "2k"
      ],
      "type": "string",
      "default": "2k",
      "description": "Output resolution tier. Every tier costs the same."
    },
    "num_outputs": {
      "type": "integer",
      "default": 1,
      "maximum": 6,
      "minimum": 1,
      "description": "How many images to generate in one request (1 to 6). Billed per image returned."
    },
    "aspect_ratio": {
      "enum": [
        "1:1",
        "16:9",
        "9:16",
        "4:3",
        "3:4",
        "3:2",
        "2:3",
        "21:9",
        "9:21",
        "2:1",
        "1:2",
        "3:1",
        "1:3",
        "5:4",
        "4:5"
      ],
      "type": "string",
      "default": "1:1",
      "description": "Output aspect ratio."
    },
    "enable_thinking": {
      "type": "boolean",
      "default": true,
      "description": "Spend extra reasoning on the rewrite for better images, at the cost of a longer wait. Only works while prompt expansion is on."
    },
    "enable_prompt_expansion": {
      "type": "boolean",
      "default": false,
      "description": "Let the service rewrite and expand the prompt before generating."
    },
    "prompt_optimization_mode": {
      "enum": [
        "direct",
        "agent"
      ],
      "type": "string",
      "default": "direct",
      "description": "How prompt expansion rewrites the brief: direct is a single pass that suits most prompts; agent is a multi-step rewrite with finer detail."
    }
  },
  "additionalProperties": false
}

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": "alibaba/qwen-image-2.1-pro/text-to-image",
  "input": {
    "prompt": "A ceramic teapot on a linen cloth, soft window light, muted palette",
    "aspect_ratio": "1:1",
    "resolution": "2k",
    "num_outputs": 1
  }
}'

Same body as createTask. It returns the expected and the highest possible charge, and runs nothing.

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 the task was accepted and the credits are held, not charged yet. The final charge never goes above the hold.

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": "alibaba/qwen-image-2.1-pro/text-to-image",
    "state": "succeeded",
    "output": {
      "assets": [
        {
          "url": "https://cdn.popnow.ai/tasks/task_01k3m8x9q2z4v7n5p6r8s0t1w3/output.png?signature=FROM_RESPONSE",
          "expiresAt": "2026-10-17T12:20:00Z",
          "mime": "image/png",
          "width": 1024,
          "height": 1024
        }
      ]
    },
    "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.