No good imo. Even CoinFacts.com isn't that great and makes more sense.
There's not many people are searching for facts about coins. And even if they did end up on your page (more likely to land on CoinFacts.com) it would be difficult to monetize the traffic to be worth your time.
You have to think that a plural -s is on average worth 1/10th the value of the singular. When you add in the double plural it really brings the value down to zero. It's hard to pronounce and just doesn't flow together.
It would be like HorsesFacts.com... Horse facts is the correct format.
There is only one public sale for a plural word + facts and that is SongsFacts.com which sold in 2019 for $119. As you can see, this domain is a long shot.