Qwen Image 2.1 Pro

Alibabaimagelive~21s

Generate images with transparent backgrounds and edit with up to 10 references.

from$0.05/ image

Exact price on the Run button. Failed runs cost $0.00.

How this model is billed

Reserved, then settled to the cent. A failed run costs $0.00.

Typical run ~21s: the measured mean, end to end.

Compare every price

Run Qwen Image 2.1 Pro

Qwen Image 2.1 Pro API

Async: the POST answers at once with a request id. Poll it, or take the webhook.

Docs

Submit

Parameters at the top level of the JSON body. Answers 202 with a request id.

curlPOST /v1/models/qwen-image-2.1-pro

curl -X POST https://api.ezflows.io/v1/models/qwen-image-2.1-pro \
  -H "Authorization: Bearer $EZFLOWS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "a wide shot of a desert at dusk",
    "size": "1328*1328"
  }'

# 202 Accepted, at once — it never waits for the model:
# {"request_id": "req_8f2a41c9b70e4d15", "status": "queued",
#  "poll_url": "https://api.ezflows.io/v1/requests/req_8f2a41c9b70e4d15"}

Poll

Same bearer header, every few seconds, until the status is final.

curlGET /v1/requests/:id

REQUEST_ID=req_8f2a41c9b70e4d15   # from the POST

while :; do
  BODY=$(curl -s https://api.ezflows.io/v1/requests/$REQUEST_ID \
    -H "Authorization: Bearer $EZFLOWS_API_KEY")
  STATUS=$(echo "$BODY" | jq -r .data.status)
  case "$STATUS" in succeeded|failed|cancelled) break ;; esac
  sleep 3
done

echo "$BODY" | jq -r '.data.output.artifacts[].url'   # media.ezflows.io, kept 90 days

Response

Files are on media.ezflows.io, kept 90 days. A failed run says why and costs nothing.

json200 · succeeded

{
  "data": {
    "id": "req_8f2a41c9b70e4d15",
    "model_slug": "qwen-image-2.1-pro",
    "status": "succeeded",
    "http_status": 200,
    "cost": 0.05,
    "auth_method": "api_key",
    "error": null,
    "submitted_at": "2026-09-12T18:07:21.114Z",
    "queue_started_at": "2026-09-12T18:07:21.402Z",
    "execution_started_at": "2026-09-12T18:07:22.010Z",
    "first_byte_at": "2026-09-12T18:07:52.871Z",
    "finished_at": "2026-09-12T18:07:55.203Z",
    "io_deleted_at": null,
    "canvas_id": null,
    "canvas_node_id": null,
    "client_attempt_id": null,
    "idempotency_key": null,
    "input": {
      "prompt": "a wide shot of a desert at dusk",
      "size": "1328*1328"
    },
    "output": {
      "artifacts": [
        {
          "index": 0,
          "kind": "image",
          "contentType": "image/png",
          "url": "https://media.ezflows.io/outputs/<account>/req_8f2a41c9b70e4d15/0.png"
        }
      ]
    }
  }
}

Webhook

Skip polling: we POST the result to your endpoint, at least once.

Register: Create an endpoint under Webhooks in the dashboard; the signing secret is shown once.
Events: request.succeeded · request.failed · request.cancelled
Headers: ezflows-event-id (dedupe on it) · ezflows-timestamp (unix seconds) · ezflows-signature t=<ts>,v1=<hex HMAC-SHA256 of "<ts>.<raw body>">
Verify: Over the exact bytes received, in constant time; reject anything older than five minutes.
Respond: Any 2xx within 10 s. Redirects are not followed.
Retries: Five, with backoff: 30 s · 60 s · 2 min · 4 min · 8 min. Disabled after five consecutive dead deliveries.

jsonDelivery body

{
  "id": "82cf46a4-841e-41d6-b3c7-facc937d3252",
  "type": "request.succeeded",
  "created_at": "2026-09-12T18:07:55Z",
  "data": {
    "id": "req_8f2a41c9b70e4d15",
    "model_slug": "qwen-image-2.1-pro",
    "status": "succeeded",
    "cost": 0.05,
    "output": {
      "artifacts": [
        {
          "url": "https://media.ezflows.io/…/0.png"
        }
      ]
    }
  }
}

curlverify.sh

# Create the endpoint under Webhooks in the dashboard; the signing secret is shown once.
# ezflows-signature: t=<ts>,v1=<hex HMAC-SHA256 of "<ts>.<raw body>">
# body.json = the exact bytes received. Reject anything older than five minutes.
EXPECTED=$({ printf '%s.' "$TS"; cat body.json; } \
  | openssl dgst -sha256 -hmac "$EZFLOWS_WEBHOOK_SECRET" -r | cut -d' ' -f1)

[ "$EXPECTED" = "$V1" ] && echo "valid" || echo "reject"

Parameters 7

Name	Type	Default	Allowed	Description
promptrequired	string	—	—	Describe the image to generate, or the edit to apply to the reference images. Ask for a transparent background to get an alpha-channel PNG.
images	string[]	—	up to 10 image urls	Optional. Up to 10 images to edit, combine or take style and subject from. Order is preserved.
size	enum	1328*1328	10241024 · 13281328 · 7681024 · 1024768 · 10801440 · 14401080 · 9281664 · 1664928 · 2048*2048	Output resolution. All sizes bill the same; total pixels from 512 x 512 up to 2048 x 2048.
prompt_extend	boolean	true	—	Let the model automatically rewrite and enrich short prompts. Turn off for transparent-background prompts: when on, the model paints a checkerboard instead of a real alpha channel.
prompt_extend_mode	enum	direct	direct · agent	How the prompt is rewritten when Prompt Extend is on. Agent is text-to-image only; use Direct when editing.
seed	integer	—	0–2147483647	Seed for reproducible results.
watermark	boolean	false	—	Add the Qwen watermark to the output.

File inputs (images: up to 10 image urls) take URLs. Upload the raw file to POST /v1/uploads with its own Content-Type and pass the url it returns. Inputs are kept 90 days.