I'm more advanced in that, I usually get the difficulty and hashnet of the same explorer of each currency, and if I can not because some explorer are complicated, the apis of some Exchanges, this could also add patrike, and if not, then before that no calculator would use the Whattomine data. But whenever you can use the explorer data

For Eaternety:

Difficulty: https://whattomine.com/coins/297.json
query: difficulty

Hashnet: https://whattomine.com/coins/297.json
query nethash

For price:
https://www.binance.com/api/v3/ticker/bookTicker
query: [? (@. symbol == 'AEBTC')]. bidPrice

in this case this currency has an explorer that does not give api, so the most reliable I found was WTM, remember to customize the currency, put reward and lock time
I think it rewards 368 and lock time 180

And choose the formula that is not exponential.

The problem of Aeternety, are two: one that pay once a day in almost all pools, and the second that most exchanges can only sell a minimum. With which from mine until you sell can spend 1 or 2 days or more.

With those data, then you must put the profit at 0.90 because I already did the test. And with all this you will always be close to the price, with difficulty and hashnet almost in real time, but WTM is in this case the one that best gives the data for lack of a better place.