A free web-based validator for quick checks.

Several open-source and web-based options are available for testing:

Many developers use Python or PHP-based scripts like sk-checker.py for local validation.

Agencies managing multiple client accounts use these tools to quickly verify that all live keys remain valid.

The checker automates the process of pinging the Stripe API to confirm if a specific "sk_live" key is active, restricted, or expired. How Does it Work?