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Design Patterns · hard

19. Hot Potato Pattern

Guaranteed transaction completion and flash loans.

1 min read2 questionsup to 50 XPtopic 19/25

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A 'Hot Potato' is a struct that has NO abilities (no `key`, `store`, `copy`, `drop`). Because it cannot be dropped, stored, or transferred, it MUST be consumed by a matching function in the same transaction block (used for flash loans).

move
public struct FlashReceipt { amount: u64 }

public fun borrow(amount: u64): (Coin<SUI>, FlashReceipt) { ... }
public fun repay(receipt: FlashReceipt, payment: Coin<SUI>) { ... }

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

Scoring

  • · Up to 30 XP from quiz accuracy.
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  • · 75% or higher marks the topic complete.

Check your understanding

  1. 1. What abilities does a Hot Potato struct possess in Move?

  2. 2. What DeFi mechanism relies heavily on the Hot Potato pattern?

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