(Reuters) - Apple Inc stands to rake in $3 billion in revenue from the Pokemon Go craze in the next one to two years as gamers buy “PokeCoins” from its app store, brokerage Needham & Co said.

A woman plays the augmented reality mobile game "Pokemon Go" by Nintendo, as a visitor uses an automated teller machine (ATM) at a branch of Sberbank in central Krasnoyarsk, Siberia, Russia, July 20, 2016. REUTERS/Ilya Naymushin

Pokemon Go, the augmented reality game from Japan’s Nintendo Co Ltd, can be downloaded for free but iPhone users can use PokeCoins to buy additional features.

A pack of 100 PokeCoins costs 99 cents in Apple's app store, but the price can go up as much as $99.99 for a pack of 14,500. (apple.co/29j1uDa)

“We believe Apple keeps 30 percent of Pokemon Go’s revenue spent on iOS devices, suggesting upside to earnings,” Needham analyst Laura Martin wrote in a client note on Wednesday.

Pokemon Go had 21 million active users in the United States alone as of July 18 - less than two weeks after going live.

The game, which has been rolled out in 35 countries, is also available on Android devices.

Martin said Pokemon Go’s ratio of paid users to total users was 10 times that of Candy Crush, the hit game from King Digital that generated more than $1 billion of revenue in both 2013 and 2014.

Users in the United States are spending far more time playing the game than they are using Facebook or WhatsApp, according to app analytics firm Sensor Tower. (bit.ly/29EQaj0)

Electronics retailers have also seen a bump in sales of mobile chargers and charging cases since the launch of the game.

Up to Tuesday’s close, Apple’s shares had gained 5 percent in market value, or about $25 billion, since the launch of the game in the United States on July 6. Nintendo’s stock has nearly doubled.

(In this July 20 story, corrects paragraph 10 to say that Pokemon Go launched in July 6, not June 6)