httpbin.org delay endpoints cap around 10 seconds, which is too low for many timeout tests. This service sleeps for a configurable duration (milliseconds).

Do not hammer it — abusive traffic may get the IP blocked.

Endpoint

POST https://node.api.zhis.ltd/public/webapi/delay

{
  "delay": 5000
}

delay is in milliseconds. See also the Delay Mock API entry on this site.