The rules for using this service. Kept short on purpose.
This service returns measurements and observations about things you ask it about. Provided as-is, without warranty.
Anonymous use is limited to 3 requests/day per IP; free keys to 50 requests/month; Entry ($5/month) to 1000 requests/month; Starter ($9/month) to 5000 requests/month. Payment is processed by Stripe. There is no uptime guarantee and no liability for losses.
Paid plans can be cancelled at any time from /account; access continues until the end of the paid period. Accounts can be deleted from the same page.