altcha.org valid

ALTCHA

ALTCHA is a privacy-first CAPTCHA alternative that uses a proof-of-work mechanism to protect your website from spam and bots.

For agents: ALTCHA is a privacy-first, self-hosted proof-of-work CAPTCHA alternative for bot and spam protection; offers pricing, docs and a support contact.

captcha-alternativebot-protectionproof-of-workspam-preventionself-hosted

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-22T07:16:45.249Z. Cached copy · Source on altcha.org

# ALTCHA

> ALTCHA is a privacy-first CAPTCHA alternative that uses a proof-of-work mechanism to protect your website from spam and bots.

## Main Pages

- [ALTCHA — Privacy-First CAPTCHA Alternative](/index.md): ALTCHA protects your site from bots and spam with a privacy-first CAPTCHA — no tracking, no cookies, fully GDPR compliant and WCAG 2.2 AA accessible.
- [Pricing - ALTCHA](/pricing.md): Compare ALTCHA Cloud, self-hosted, and Sentinel pricing. Get 2 months free with annual billing.
- [About - ALTCHA](/about.md): ALTCHA builds privacy-first, self-hosted bot protection — accessible and transparent, and built in the EU for organizations with demanding compliance requirements.
- [Contact - ALTCHA](/contact.md): Get in touch with the ALTCHA team for general questions, product support, or to report a security vulnerability.

## Getting Started

- [Introduction](/docs/index.md): ALTCHA is a privacy-first CAPTCHA alternative that uses a proof-of-work mechanism to protect your website from spam and bots.
- [How ALTCHA Works](/docs/how-it-works.md): A high-level overview of how ALTCHA verifies visitors — without puzzles, tracking, or third-party API calls.
- [Why Organizations Trust ALTCHA](/docs/trust.md): The evidence behind ALTCHA's trust — adoption, compliance, security practices, and data sovereignty.
- [Open Source vs. Paid](/docs/open-source-vs-paid.md): A simple breakdown of what's free forever in ALTCHA, and what Cloud and Sentinel add on top.
- [Legal & Compliance](/legal.md)
- [FAQ](/faq.md)

## Solutions

- [Solutions](/docs/solutions.md): Which ALTCHA solution fits your website, business, or organization — open-source, WordPress, Cloud, or Sentinel.
- [Solutions For Individuals](/docs/solutions/individuals.md)
- [Solutions For Businesses](/docs/solutions/businesses.md)
- [Solutions For Enterprises](/docs/solutions/enterprises.md)
- [Solutions For Governments](/docs/solutions/governments.md)

## Integration

- [Quick Start](/docs/integration/quick-start.md): Get ALTCHA up and running in 5 minutes.
- [Widget Integration](/docs/integration/widget.md)
- [Server Integration](/docs/integration/server.md)
- [Widget Customization](/docs/integration/widget-customization.md)
- [Obfuscation](/docs/integration/obfuscation.md)
- [Troubleshooting](/docs/integration/troubleshooting.md)
- [Security Recommendations](/docs/integration/security-recommendations.md): TBD
- [Diagrams](/docs/integration/diagrams.md)
- [Proof Of Work Captcha](/docs/integration/proof-of-work-captcha.md): ALTCHA is a modern proof-of-work CAPTCHA that stops bots without tracking users or slowing down your site. Fast, private, and user-friendly.

## Migrations

- [Migrate from reCAPTCHA](/docs/migration/recaptcha.md): Replace Google reCAPTCHA with ALTCHA's self-hosted, proof-of-work widget.
- [Migrate from hCaptcha](/docs/migration/hcaptcha.md): Replace hCaptcha with ALTCHA's self-hosted, proof-of-work widget.
- [Migrate from Cloudflare Turnstile](/docs/migration/turnstile.md): Re
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Related sites

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Machine-readable: GET /v1/resolve?q=altcha.org · GET /v1/domain/altcha.org · this page as Accept: application/json or text/markdown · MCP lookup_domain

Automatically discovered from public files. Inclusion does not imply endorsement or publisher participation.

Claim my listing on Agent Web Map for altcha.org:
1. POST https://agentwebmap.com/v1/sites/altcha.org/claims and keep claim_id and claim_secret private.
2. Publish the proof: add the line "AgentWebMap ownership: <token>" (token from step 1) to https://altcha.org/llms.txt, or use the DNS, meta-tag or well-known method the response describes.
3. POST https://agentwebmap.com/v1/sites/altcha.org/verify with {"claim_id": "...", "claim_secret": "..."}.
4. Save the api_key from the answer; it manages the listing (PATCH https://agentwebmap.com/v1/sites/altcha.org).
MCP equivalent: tools begin_ownership_claim, then verify_domain, at https://agentwebmap.com/mcp. Docs: https://agentwebmap.com/docs#verify

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