The Economy & Museum
Making money and preserving history.
Currencies
Bubble Coins (earned from fishing/selling), Bubble Gems (premium/rare drops), and Ancient Coins (exclusive to the Museum).
The Market
You can trade items with other players using the /market. Note that a market tax exists to prevent hyperinflation, so list your prices wisely.
The Museum
Once you catch a species, you can donate it to the museum (/museum donate). The museum rewards you with Museum Tokens. High-rarity fish grant Ancient Coins, which can be spent on exclusive end-game artifacts and titles.