With Cassie.fm, each credit gets you one API check. Your free daily allowance of 1600 credits is enough to monitor an API every minute, two monitors every two minutes, or even 20 monitors every 20 minutes all day long, keeping you covered around the clock.
50.000
Monitor one API every minute for 30 days.
Price: $1
One credit:
$0.000020
250.000
Monitor five APIs once a minute for 30 days.
Price: $4
One credit:
$0.000016
500.000
Multiple monitors at high frequencies.
Price: $7
One credit:
$0.000014
2.500.000
Large-scale monitoring, heavy usage.
Price: $30
One credit:
$0.000012