About Kasada

Kasada is an abnormal traffic detection protection system. Its core features dynamic fingerprinting combined with behavioral verification. It generates unique device fingerprints through hidden JS code and may trigger sliding CAPTCHAs or image selection challenges, making it a user-friendly CAPTCHA system.

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EZ CAPTCHA API Guide: Easily Solve Kasada

EZ Captcha makes Kasada cracking simple and efficient through our service.EZ Captcha APISeamlessly integrate our service to provide automated CAPTCHA solving for your applications.

SOLUTION	SPEED	PRICE / 1000 REQUESTS
Kasada	< 3 s	$ 2.5

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Kasada

How to Obtain /tl Payload

1. Request the target URL and get blocked by 429 status code to obtain a URL pointing to /ips.js in the response body.

2. Send a GET request to the ips.js URL and store the response content, which will need to be sent to the API later.

3. Make a POST request to the API with the following form data

1-Create Task

Create a task using the createTask method

Request domain: https://api.ez-captcha.com

Request API: https://api.ez-captcha.com/createSyncTask

Request format: POST application/json

2-Parameter Structure

Parameter	Type	Required	Description
clientKey	string	true	Account client key, viewable in the personal center
task	object	true	Task parameter object, details are the following items in this table
type	string	true	Task type, e.g., KasadaTaskProxyless
ua	string	true	The UserAgent you want to use, which needs to match the UA in your program
ipsContent	string	true	The response body content from /ips.js
lang	string	true	The primary accept-language from your program's headers (only need to send the first language)
bmsz	string	true	The value of bm_sz in cookies
domain	string	true	The target domain you want to bypass, e.g., xxx.xxxx.com

3-Request Example

4-Response Structure

Parameter	Type	Description
errorId	Integer	Error message: 0 - no error, 1 - error
status	string
solution	Object	For Kasada type, the recognition result will be contained in the payload object
solution.ct	string	Get ct from the response and use it as the /tl POST request header: X_***_Ct X_***_Ct
solution.dt	string	Get dt from the response and use it as the /tl POST request header: X_*****_Dt
solution.tl	string	Returns a Base64-encoded response (tl field). You need to decode this response into a byte array and send it to /tl

5-Response Example

* After sending parameters to the /tl request, the response headers will return a new ct (x-kpsdk-ct). This new ct must be included in subsequent requests to other URLs.

The response will also return an st (x-kpsdk-st), which is used to generate the worktime.

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