Creative Custom BB code with live update

[Codeless]

Hello can i make Custom BB Code in Xenfor wich live update rates from internet .

like Gold Rate

in thread we will post something like

Today Gold Rate is <GoldRate></GoldRate>

so it will replace current gold rate . from internet and fect crone based .

also Today Gold rate is <Goldrate></Goldrate> and Buying Rate is <BuyingRate></BuyingRate> & Today selling rate is <SellingRate><SellingRate>


so it will work like

Buying rate formula

Buying Rate : Goldrate x 0.2%
Selling Rate : Goldrate x 0.3%

if someone can properly assist me thanks in advance