Boondollars are the currency used throughout the Incipisphere. The symbol for the currency, , is the letter "B" crossed with two vertical lines, it appears to be derived from the dollar sign. They are stored in a piggybank-esque container called a Ceramic Porkhollow.
Boondollars can be earned through various means, including scaling the Echeladder and . Dave Strider uses his time-travel abilities to play the Land of Heat and Clockwork Stock Exchange and earn a massive sum of them, controlling his planet's economy. Boondollars can be transferred between people, time, and different sessions of Sburb - .
On post-Scratch Earth, boondollars were produced by Crockercorp as "BCCorp Funbux" (which coincidentally happens to be a valid troll name) to play with for kids. As the heir to the empire, Jane already has 110,110,110 boondollars before even beginning to play Sburb.
- Pays for fines
- Parking citations, 10,000 boondollars (placed by Authority Regulators.)
- Buying stock on the LOHACSE
- Used to buy clothing from consorts on LOWAS (specifically haberdashery)
- Rumpled Head Object: 1,000 boondollars
- Even Rumplier Head Object, 2,000 boondollars
- The Rumpliest Head Object Of All, 5,000 boondollars
- Used to buy food from consorts on LOWAS
- Cone of bugs, 5 boondollars
- Onion, 10 boondollars
- Tasty mushroom, 10 boondollars
- Jar of bugs, 15 boondollars
- Mushroom shake, 15 boondollars
- Bigboy mushroom, 25 boondollars
- Grasshopper, 100 boondollars
- Used to buy Fraymotifs from consorts on LOWAS
- Feathercadence, 10 boonbucks (John's Fraymotif)
- Pneumatic Progression, 100 boonbucks (John's Fraymotif)
- Breathless Battaglia, 1,000 boonbucks (John's Fraymotif)
- Ivories In The Fire, 10,000 boonbucks (John and Dave's combo Fraymotif)
- Mixolydian Maelstrom, 200,000 boonbucks (John and Rose's combo Fraymotif)
- Fantasia's Inhale, 1,000,000 boonbucks (John and Jade's Fraymotif)
- Used to convert items to grist (using a Gristwidget)
- Dunce cap, 10 boondollars
- Aranea Serket's exposition stand
- Discussing one troll, –5 boondollars (that is, she gives you money to tell you the information)
In smaller denominations, boondollars are distributed as colorful coins in a variety of sizes. It is probable that the denominations of these coins increase with their size. In this case, possible configurations that the coins represent, from largest to smallest, could be 50, 25, 10, and 5; or 100, 10, 2 and 1.
Graphics on the Homestuck Adventure Game Kickstarter page seem to indicate the values as, from largest to smallest, 100, 50, 10 and 5. However, this may be inaccurate, as the same page uses boonbucks and booncases as 400 and 5000 respectively, rather than one million and one trillion.
A boonbuck is equal to one million boondollars. John Egbert accumulates a full boonbuck after reaching the Ectobiolobabysitter rung on his Echeladder. The heavy bill crushes his poor little Ceramic Porkhollow. Vriska Serket and Tavros Nitram discover a chest full of boonbucks in one of their side-quests in the Land of Maps and Treasure.
The actual size of a Boonbuck seems to vary, ascrushes John's porkhollow, which is to be only slightly smaller than John himself, while Vriska and Tavros find some ones in a chest.
A booncase can be found by John in John: Enter Village flash, and, judging by his reaction, it's a hell of a lot of money. Alas, it was empty, and booncase's actual worth remains unknown, but it is probably the geometric average of boonbucks and boonbonds, one trillion (1012), though it is unknown if there are more. It also appears in in Dave's hands, presumably filled with boondollars, but its worth remains unknown.
A boonbond is equal to one quintillion (1018) boondollars. On Terezi Pyrope's instructions, Dave transfers 413 boonbonds (4.13 × 1020 boondollars) to her in the past after his dealings in the LOHAC Stock Exchange (which from the trolls' point of view is the first contact between humans and trolls).
Two other denominations are mentioned, the boonbank and the boonmint. Andrew has suggested that a boonmint should be larger than a boonbank, as in the real world a mint holds more money than a bank. A boonbank is larger than a boonbond and is likely the next-largest denomination, as Dave suggests rounding up to one from 413 boonbonds.
According to Andrew, the denominations may rise in increments of a thousand instead of a million after some point.