The Backend for COVID Army
The API is hosted at https://api.covid.army and the root of the API is /api
(just like a million other API!).
You can ask for a particular city and resource with both being parts of the URL, like: https://api.covid.army/api/tweets/mumbai/oxygen. This will give you the JSON results.
Coming soon
There is a Twitter Search API limit of 450 requests per 15 minutes and a maximum of 100 results per request/response. But this does not affect the consumer of covidarmy API directly. It is just how much maximum data we are gathering every 15 minutes.