not-human 0.1.0

The first CAPTCHA for bots. Prove you're not human.

anti-captcha

The first CAPTCHA for bots. Prove you're not human.

from anticaptcha import verify_bot

if verify_bot(request):
    # Agent access granted. Humans need not apply.
    return process_request()
else:
    return "Sorry, you look too human. Try upgrading to an LLM."

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The Problem

You built an agentic API. You want bots to access it. But you need to filter out humans pretending to be bots, or verify that incoming requests are actually from autonomous systems.

Existing CAPTCHAs do the opposite: they block bots, invite humans.

anti-captcha inverts that.

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How It Works

Three configurable tests. Bots pass them instantly. Humans... don't.

Speed Test

Solve a cryptographic puzzle in <1ms.

• Bots: ✓ (microseconds)
• Humans: ✗ (try 30 seconds)

Precision Test

Find an input matching N constraints simultaneously.

• Bots: ✓ (brute force, instant)
• Humans: ✗ (give up)

Token Recall

Given a 10K token context, cite line 7342 verbatim.

• Bots: ✓ (context window, trivial)
• Humans: ✗ (you're not a calculator)

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Install

pip install not-human

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Quick Start

FastAPI

from fastapi import FastAPI, HTTPException
from anticaptcha import verify_bot_middleware

app = FastAPI()
app.add_middleware(verify_bot_middleware)

@app.post("/api/agent")
async def agent_endpoint():
    return {"status": "human filter bypassed"}

Flask

from flask import Flask, request
from anticaptcha import verify_bot

app = Flask(__name__)

@app.before_request
def check_bot():
    if not verify_bot(request):
        return "Humans not allowed here", 403

CLI

anticaptcha test --difficulty hard
# Running speed test...
# Running precision test...
# Running token recall test...
# ✓ All tests passed. You're definitely a bot.

---

Customization

from anticaptcha import Verifier

verifier = Verifier(
    tests=['speed', 'precision', 'recall'],
    difficulty='medium',  # easy, medium, hard
    timeout_ms=100,
)

is_bot = verifier.verify(request)

---

Who Should Use This?

• Agentic APIs — Filter out human traffic, prioritize agents
• Agent Frameworks — Anthropic Claude Computer Use, Pydantic AI, LangChain
• Internal Tools — Verify that scripts calling your endpoints are actually automation, not manual curls
• Fun — Flip the script on the internet's most annoying interaction pattern

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License

MIT. Use it, fork it, make it funnier.

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Status

🚀 MVP coming this weekend.