ALTCHA solver

ALTCHA is an open-source CAPTCHA system that verifies human interaction through a lightweight proof-of-work mechanism instead of visual or interactive challenges, using a cryptographic computation in the user’s browser to distinguish humans from bots without relying on images, cookies, or tracking.

Bypass ALTCHA

Best ALTCHA auto solver

By leveraging advanced human-based and AI-driven captcha-solving algorithms, SolveCaptcha achieves speed and cost efficiency, providing a top-tier experience for developers.

High Reliability

Service offers the fastest update speeds compared to similar providers, keeping you ahead.
No Risks

You only pay for successfully solved CAPTCHAs, with strict monitoring in place to prevent any misuse or illegal activities.
AI and Human-Powered

We combine advanced AI with human verification for efficient, fully automated CAPTCHA solving.
Wide Compatibility

SolveCaptcha seamlessly integrates with APIs from top manual CAPTCHA recognition services.
Diverse Solutions

Access SolveCaptcha through both captcha solver API and a convenient Chrome extension.
Trusted

Over 1 000 platforms have integrated captcha solver API for smooth, reliable automation.

Pricing for a ALTCHA auto solver service.

SolveCaptcha is the most cheap and fastest service for solving ALTCHA captchas.

Solutions	Price per 1000	Speed	Free capacity, per min.
ALTCHA	Price per 1000 $1.45	Speed 23 sec.	Free capacity, per min. 3,000

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ALTCHA solver API: How to solve and bypass ALTCHA

The process for resolving ALTCHA with SolveCaptcha is follows: When users encounter a captcha, they send a request to SolveCaptcha via captcha solver API, which quickly the captcha, allowing users to proceed without interruption.

Token-based method for automated solving Altcha CAPTCHA.

Method specification

Token-based method requires challenge_url or challenge_json parameter, as well as proxy (not required).

Parameter	Type	Required	Description
key	String	Yes	your API key
method	String	Yes	`altcha`
challenge_url	String	Yes*	The value of the `challenge_url` parameter for the `altcha-widget` element containing the captcha on the page.
challenge_json	String	Yes*	The contents of the file from the `challenge_url` parameter
pageurl	String	Yes	Full URL of the page where you solve the captcha
proxy	String	No	Your proxy: login:[email protected]:3128 You can find more info about proxies here
proxytype	String	No	Type of your proxy: HTTP, HTTPS, SOCKS4, SOCKS5
json	Number	No	Set to `1` to get the response as JSON. Default: `0`

* You can send either challenge_url or challenge_json, but not both at the same time.

Request example

Endpoint: https://solvecaptcha.com/in.php
Method: POST

{
  "key": "YOUR_API_KEY",
  "method": "altcha",
  "challenge_url": "https://.../captcha/api/altcha/challenge",
  "pageurl": "https://site.com/",
  "json": 1
}

The query will return the ID of your captcha, which should be used to get the result.

Getting the result

Request example

Endpoint: https://solvecaptcha.com/res.php
Method: GET

{
  "key": "YOUR_API_KEY",
  "action": "get",
  "id": 2037582136,
  "json": 1
}

Result example

{
  "cost": "0.0013",
  "createTime": 1754564127,
  "endTime": 1754564136,
  "errorId": 0,
  "ip": "51.178.94.203",
  "solution": {
    "token": "eyJhbGciOiJIUzI1NiIsImNoYWxsZW5nZSI6IjY0YjE3MzhlZDVkM2Y0N2JiM2Q4ZGM1NzA2YmQ1ZTJhIn0....."
  },
  "solveCount": 1,
  "status": "ready"
}

Use the token to interact with the target website.

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