Gold is a currency in BABFT. Gold can be earned by creating a boat, then passing Stages. Gold can also be bought with robux. It can be spent on chests which will give the player more blocks or tools to build a boat. It can also be spent on the Painting Tool, car packs, or limited items. Gold is given based on how far you travel inside the map, not above or below it. The game knows when you passed a Stage because when you touch the black part at the end of a Stage, the game adds 4 (or 5 with +25% gold group perk) to the Earned Gold value. When you die the Gold Earned gets added to your balance. If you close the game (or lose connection to the server) before you actually got your earned gold, it will NOT be added to your balance. Since Wheel Boats and Jet packs go outside of the Stages the game does not count that as travelling. Rocket Wheel is sometimes in the map and sometimes out of it so it usually gives around 10-80 Gold.
The maximum amount of gold it's currently possible to earn in one run, without any unknown glitches or exploits, is 225 gold, with both the Royal Member perk and the 2x Gold gamepass.