Where do you get 1460K number? The explorer used to have the number of claimed clams, but now I can't find it.
You can use this:
https://just-dice.com/api/supply{"moneysupply":1541886313048927,"digsupply":81867962870962,"stakesupply":64446172641730,"activesupply":146314135512693}
You probably want activesupply/1e8.