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The Engine is the Terminal's core reward mechanism. Every trade generates a drop entry based on the selected fee tier. When a drop triggers, the reward is delivered instantly from a list of tiered rewards.

The Engine uses a Verifiable Random Function (VRF): Every drop result can be independently verified onchain and no single entity can influence outcomes.

• USDC — Instant liquid claimable tokens.
• XREY — The ownership unit on REY’s Vault.

XREYs are non-transferable ownership units earned from every trade on REY. They determine your share of Vault distributions and unlock additional platform benefits.

• Every swap earns you XREY based on the fee paid
• Formula: 1 XREY per $0.10 in fees (rounded, minimum 1 XREY per swap).
• Every swap with 10+ XREY automatically triggers the drop engine.
• If you don't win USDC, you receive 50–200 XREY (currently the highest mine rate).

Stacking XREY is the best way to capture the biggest upside on REY.

A real time feed of all drops won. See every Index user and what they have earned from boosting their trades. Click the amount to view the onchain proof.

Every time someone pays a fee on REY, all reward pools automatically grow.

Each pool has a variable win rate and can be boosted with every trade. The size of drops change based on the total available liquidity in the The Vault at any given time.

Learn more about how fees are used here:

IN DEPTHFees Explained