2captcha

2Captcha Skill

Solve CAPTCHAs programmatically using the 2Captcha human-powered service.

Source and feedback: https://github.com/adinvadim/2captcha-cli

Privacy and Authorized Use

This skill sends CAPTCHA images, page URLs, sitekeys, challenge IDs, and task metadata to 2Captcha for processing by the 2Captcha service and its human solvers. Use it only for authorized automation, and do not submit sensitive, regulated, internal, or third-party user data unless you have approval.

Installation

# Install this agent skill with skills.sh
npx skills add adinvadim/2captcha-cli

# Or install with ClawHub/OpenClaw
openclaw skills install 2captcha

# Install the CLI after reviewing the source
git clone https://github.com/adinvadim/2captcha-cli.git
cd 2captcha-cli
python3 solve-captcha --version
mkdir -p ~/.local/bin
ln -sf "$PWD/solve-captcha" ~/.local/bin/solve-captcha

# Verify
solve-captcha --version

Configuration

# Save your 2Captcha API key
mkdir -p ~/.config/2captcha
echo "YOUR_API_KEY" > ~/.config/2captcha/api-key

# Or use environment variable
export TWOCAPTCHA_API_KEY="your-key"

Get your API key at https://2captcha.com/enterpage

The CLI reads credentials only from the --api-key flag, TWOCAPTCHA_API_KEY, ~/.config/2captcha/api-key, or ~/.2captcha-api-key.

Quick Reference

Check Balance First

solve-captcha balance

Image CAPTCHA

# From file
solve-captcha image /path/to/captcha.png

# From URL  
solve-captcha image "https://site.com/captcha.jpg"

# With options
solve-captcha image captcha.png --numeric 1 --math
solve-captcha image captcha.png --comment "Enter red letters only"

reCAPTCHA v2

solve-captcha recaptcha2 --sitekey "6Le-wvk..." --url "https://example.com"

reCAPTCHA v3

solve-captcha recaptcha3 --sitekey "KEY" --url "URL" --action "submit" --min-score 0.7

hCaptcha

solve-captcha hcaptcha --sitekey "KEY" --url "URL"

Cloudflare Turnstile

solve-captcha turnstile --sitekey "0x4AAA..." --url "URL"

FunCaptcha (Arkose)

solve-captcha funcaptcha --public-key "KEY" --url "URL"

GeeTest

# v3
solve-captcha geetest --gt "GT" --challenge "CHALLENGE" --url "URL"

# v4
solve-captcha geetest4 --captcha-id "ID" --url "URL"

Text Question

solve-captcha text "What color is the sky?" --lang en

Finding CAPTCHA Parameters

reCAPTCHA sitekey

Look for:

• data-sitekey attribute in HTML
• k= parameter in reCAPTCHA iframe URL
• Network request to google.com/recaptcha/api2/anchor

hCaptcha sitekey

Look for:

• data-sitekey in hCaptcha div
• Network requests to hcaptcha.com

Turnstile sitekey

Look for:

• data-sitekey in Turnstile widget
• cf-turnstile class elements

Workflow for Browser Automation

1. Detect CAPTCHA - Check if page has captcha element
2. Extract params - Get sitekey/challenge from page source
3. Solve via CLI - Call solve-captcha with params
4. Inject token - Set g-recaptcha-response or callback

Example: Inject reCAPTCHA Token

// After getting token from solve-captcha
document.getElementById('g-recaptcha-response').value = token;
// Or call callback if defined
___grecaptcha_cfg.clients[0].callback(token);

Cost Awareness

• Check balance before heavy automation
• Image: ~$0.001 per solve
• reCAPTCHA/hCaptcha/Turnstile: ~$0.003 per solve

Error Handling

Common errors:

• ERROR_ZERO_BALANCE - Top up account
• ERROR_NO_SLOT_AVAILABLE - Retry in few seconds
• ERROR_CAPTCHA_UNSOLVABLE - Bad image or impossible captcha
• ERROR_WRONG_CAPTCHA_ID - Invalid task ID

Notes

• Solving takes 10-60 seconds depending on type
• reCAPTCHA v3 may need multiple attempts for high scores
• Some sites detect automation - use carefully
• Tokens expire! Use within 2-5 minutes

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: adinvadim
• Source: adinvadim/2captcha-cli
• License: MIT
• Homepage: https://clawhub.ai/adinvadim/2captcha

Install and usage instructions live in the source repository linked above.