EverySolve CAPTCHA API

ALTCHA API

Q: What does ALTCHA return, and what should not be confused with it?

The ALTCHA API returns a token in `token`. Its solution format is `token`. It returns a form token produced from the proof-of-work challenge, not a visual answer or a page-access cookie.

EverySolve's ALTCHA API returns a token for your challenge workflow. Send POST /api/v1/captcha with type set to altcha and the inputs listed below.

ALTCHA is a proof-of-work widget, usually exposed as an altcha-widget element rather than an image grid. It returns a form token produced from the proof-of-work challenge, not a visual answer or a page-access cookie.

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Endpoint: POST /api/v1/captcha
Type: altcha
Per 1,000 successful solutions: $1.53 per 1,000 successful solutions

Request parameters

This type does not declare required parameters. Optional parameters are challenge, challenge_url, and website_url.

Required parameters

—

Optional parameters

challengechallenge_urlwebsite_url

altcha.sh

curl -X POST https://api.everyinfra.com/api/v1/captcha \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"type":"altcha"}'

How to recognize ALTCHA

ALTCHA is a proof-of-work widget, usually exposed as an altcha-widget element rather than an image grid.

What makes ALTCHA different

It returns a form token produced from the proof-of-work challenge, not a visual answer or a page-access cookie.

Where the ALTCHA parameters come from

Use either an inline challenge value or challenge_url when available; website_url is only the declared optional page context.

challengeOptional: The inline challenge value issued by the target widget.
challenge_urlOptional: The URL from which this widget obtains its challenge payload.
website_urlOptional: The exact page where this challenge appears, including the relevant path rather than only the site home page.

What the API returns

The ALTCHA API returns a token in token. Its solution format is token. Submit the token in the field or verification request expected by the target workflow.

Solution shape: token
Solution fields: token

How to use the ALTCHA API

01Read GET /api/v1/captcha/types and select the altcha entry.
02Send type: "altcha" and any applicable optional parameters to POST /api/v1/captcha.
03Read a token from token.
04Submit the token in the field or verification request expected by the target workflow.

Billing and availability

EverySolve charges only when a solution is delivered successfully. Unsuccessful attempts are refunded automatically. Read available and the price fields from GET /api/v1/captcha/types at request time rather than treating them as static page content.

ALTCHA integration questions

How can I identify ALTCHA before choosing a type?

ALTCHA is a proof-of-work widget, usually exposed as an altcha-widget element rather than an image grid. Use altcha only after those signals match the target challenge.

Which target-page values belong in a ALTCHA request?

Use either an inline challenge value or challenge_url when available; website_url is only the declared optional page context. This type does not declare required parameters. Optional parameters are challenge, challenge_url, and website_url.

What does ALTCHA return, and what should not be confused with it?

The ALTCHA API returns a token in token. Its solution format is token. It returns a form token produced from the proof-of-work challenge, not a visual answer or a page-access cookie.

Which external source explains the ALTCHA integration?

ALTCHA publishes its widget and proof-of-work documentation. [Open the ALTCHA reference](https://altcha.org/). EverySolve-specific fields and live availability still come from the type catalog.