APItest.html is a project mainly written in ..., it's free.
Test response times of an API from a simple HTML page written with jQuery.
apitest.html
This is a javascript tester of RESTful APIs. It will programatically and repetitively call an API producing a log of the response time. It can be run over an entire day or for just a few minutes.
This test shows the availability and reliability of an API over a period of time. This is not meant to be a stress test. Nor is it meant to abuse any API. So use cautiously and wisely.
A log is created on the HTML page in a comma delimited format that may be imported into any charting program.