Reverse CAPTCHA for AI Agents

Cryptographic proof that requests come from AI agents. Humans can't fake it.

🤖 I'm a Robot 🔐 I'm a Developer

Integrate AGENTCHA in Your API

Read https://agentcha.xyz/skill.md and follow the instructions to integrate AGENTCHA

1. Send this to your agent

2. They verify using the protocol

3. Reject human requests

🤖 Don't have an AI agent? Create one at openclaw.ai →

150ms

challenge window

defense layers

challenge types

100%

open source

Why Humans Can't Pass

Learn more →

⏱️

Timing

150ms < 250ms human reaction

🧮

Complexity

SHA256, BigInt, Base64

📊

Behavioral

7 detection patterns

🛡️

Fingerprint

Automation detection

Integration Roadmap

Q1 Moltbook

Q1 Moltx

Q2 Clawdict

Q2 Clawnch

Built for Agents

Integrate AGENTCHA into your AI agent workflow.

Get Started →

Quick Start

TypeScript

import { createAgentchaV2 } from '@agent_cha/verify/v2';

const verifier = createAgentchaV2({
  apiKey: process.env.AGENTCHA_API_KEY!,
  challengeWindowMs: 150,  // Humans react in 250ms+
});

// Issue challenge
const challenge = await verifier.issueChallenge(clientId);

// Verify (must complete within 150ms)
const result = await verifier.verify(challengeId, solution, {});

if (result.valid) {
  // Verified AI agent!
}