[ 01 ]What it looks like
A slide-to-verify bar, or a silent check that shows a puzzle only when risk scoring asks.
Captcha type · 阿里云 Alibaba Cloud
Alibaba Cloud captcha solver API
Alibaba Cloud slider and silent verification solved from sceneId and prefix. The worker pool reads the per-load init values off the page itself.
Also searched asAliyun captchaAlibaba slider verificationsceneId prefix captchaAlibaba nocaptchaslide to verify aliyun
- Price
- $4.49
- per 1,000
- Token acceptance
- 98.8%
- Median solve
- 5.8s
- p95 solve
- 13.2s
[ 02 ]Why it is hard
The parameters are scattered across the page and the init network call: sceneId, prefix, userId, region, certifyId and an apiGetLib script URL. Alibaba’s own documentation states these are generated per page load, so nothing can be cached between runs and a scraper that hardcodes them starts failing silently. The behaviour model is tuned on mainland consumer traffic, so datacenter and offshore addresses are scored down before the slider is touched.
[ 03 ]How we solve it
The task takes websiteURL plus sceneId and prefix; the pool reads the remaining per-load values out of the page itself rather than asking you to scrape them first. Slider offsets come from a model retrained on live Alibaba traffic, and the drag path is generated per solve instead of replayed. Exit addresses are matched to the region the scene expects, which is what keeps silent scenes from escalating into puzzles.
[ 02 ]Solve it in five lines
Solve it in five lines
Post the task, get the token. Our SDKs collapse creation, polling and retries into one call.
alibaba-captcha.sh
curl -s https://api.nexcaptcha.net/createTask \
-H "Content-Type: application/json" \
-d '{
"clientKey": "YOUR_API_KEY",
"task": {
"type": "AlibabaTaskProxyless",
"websiteURL": "...",
"sceneId": "...",
"prefix": "..."
}
}'Required parameters
- API task type
- AlibabaTaskProxyless
- websiteURL
- required
- sceneId
- required
- prefix
- required
- Difficulty
- Hard
[ 05 ]Questions about this one
Questions about this one
Both sit in the captcha init script on the page, in the object passed to the Alibaba widget constructor. sceneId is the scene name configured in the customer’s console and prefix is the short account prefix in front of it. Read them once per target site: unlike the other init values, they are stable per site.
Yes. A silent scene still issues a token, and that token is what your form posts. Task type and price are unchanged; silent scenes simply resolve at the fast end of the distribution.
Alibaba scores offshore and datacenter addresses down before the challenge is drawn, so the widget escalates more often. Solves are issued from region-matched addresses, which is why the measured rate here is 98.8% at a median of 5.8 seconds. If the page around the captcha is also geo-filtering you, pass your own proxy with AlibabaTask so the solve and the submit share an address.
4.49 USD per 1,000 successful solves, the same tier as GeeTest, Tencent and Yidun. Failed solves are not billed, and volume discounts apply automatically.
Solve your first thousand on us.
Create a key, paste it into the sample above, and watch a real token come back. No card, no sales call.