Red Gold

Red Gold is the currency of Asgard and Valhalla. It is also acceptable in the other realms of the Nine Worlds.

The Sword of Summer
Samirah al-Abbas gives red gold to the frost giant Harald in order for her and Magnus Chase to use his boat to fish in order to attract the sea goddess Ran.

Appearance
As described by Magnus, Red Gold has a gold surface which glows so warmly that it seems to be on fire.

Trivia

 * Red Gold appears to be the Norse counterpart of Golden Drachmas and Denarius.