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

## Quick Reference

### Check Balance First
```bash
./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

Detect CAPTCHA - Check if page has captcha element
Extract params - Get sitekey/challenge from page source
Solve via CLI - Call solve-captcha with params
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

2captcha

2Captcha Skill

Installation

Configuration