What is dust?
Dust is the fractional PEG that didn't make a complete object. It is the change left over when a buy doesn't land on a clean integer boundary.
If you buy 2.7 PEG, you get 2 objects (= 2.0 PEG) and 0.7 PEG of dust in your wallet. The 0.7 has ETH value, but it cannot become a third object on its own. Dust is liquid, sellable, and transferable like any other ERC-20 balance.
Every 1.0 PEG = 1 peg. Fractional PEG sits as dust in your wallet — it cannot be combined later, but it retains its ETH value.
Why dust exists
Objects are whole units. The protocol enforces a strict 1.0 PEG = 1 object boundary, there is no such thing as a 0.7 object. When a swap produces a non-integer PEG amount, the integer part mints objects and the remainder becomes dust.
This isn't a bug or a rounding error. It's the mechanism that gives each object its whole-unit identity and clear scarcity model. Without the dust rule, you could mint arbitrary fractional objects, breaking the rarity score and the visual identity guarantee.
Can I lose dust?
No. Dust is permanent ETH-denominated value in your wallet. It stays in your balance forever, there is no expiry, no sweep, no slashing. It is not at risk from slippage, fees, or any protocol action.
Dust accumulates across multiple buys. If your dust eventually crosses the next 1.0 PEG boundary, the buy that pushes you over mints one additional object automatically.
What you'll see in the buy preview
When you enter an ETH amount in the buy form, peg.fun shows:
You will receive N objects + X.XXXX dust
This appears before you sign, so you can adjust the amount up or down if you care about minimizing dust. A common pattern: round your ETH input up slightly so you end the buy on a clean integer PEG balance.
Dust on the sell side
You can sell any amount, including pure dust. Selling exactly 1.0 PEG burns one object and converts the corresponding amount back to ETH. Selling 0.7 PEG (only dust, no full object) just converts the fractional balance back to ETH, no object burns.
If you sell 1.3 PEG, one object burns (corresponding to the integer 1.0) and 0.3 PEG of fractional value also converts to ETH.
Why this matters for rarity
The 1.0 PEG = 1 object rule is the foundation of peg.fun's rarity model. Each object has a deterministic seed and a slot configuration that produces unique art. If fractional objects existed, the rarity score would dilute across infinite states and the "every unit has visual identity" promise would break.
Dust preserves the model: you can hold arbitrary fractional ETH-denominated value in PEG, but every object is a clean integer unit with its own identity.