Does anyone know any web platform where I set keys/values to query via service?

Does anyone know any web platform where I set keys / values to query via service?

I want something that would be like if I had a server with a service in which I pass the key and get the value. But that, without I having to have my own server.

Ex .: 'I set up on the server the key / value: "car" -> "Astra". -Via Service I pass the key "car" and the service returns "Astra".

I want to know if there is something that I create an account and configure these things without I having to have to create a server and program this logic.