Is there a website with webhook and api for hook?

Question

JavaScript

Good day.
There is a certain System1 that accepts HTTP requests (ajax), and can send hooks to another system - System2. And then some System3 should pick up these hooks from System2 (ajax) and process them. Can anyone suggest an online service (preferably free) that can act as System2 - and receive a webhook and give it away, that is, also have its own API?

Answer 1

botnet is called