Prefix any command with check
and get one word back. The command is either runnable or it isn't. That's it.
Will this command produce a result? Check answers that question. Deterministically, at the speed of an API call, for four cents.
Pass any command. curl, wget, httpie, python, node — anything with a network target. From your terminal, a script, a pipeline, stdin, an AI agent — anywhere a command is generated before it's executed.
Runnable or invalid. Exit code 0 or 1. No scores, no explanations, no opinions. A fact, not an assessment.
Reads from arguments or stdin. Returns an exit code. Works in bash, CI, Docker, cron, webhook chains — anywhere sh
runs.
Check needs curl and a shell. You already have both.
CHECK_KEY
in your environment for CI and containers.Prepaid balance. No subscription. Never expires.
$0.04 deducted per check. Your balance stays until you use it.