Peer-to-Peer Flashloan

A P2P flashloan allows third parties to draw temporary liquidity from other accounts. For users, this means any token they hold can become a source of yield.

This workflows defines a simple p2p flashloan. The lender transfers their token balance to a loan taker, allows subsequent workflows to execute, and finally checks that their balance is restored. If the loan is not repaid, the transaction reverts.


# Flashloan script: Lends tokens to a participant and ensures repayment within the same tx
contracts:
  weth:
    abi: std/erc20
    address: 0x...
 
constants:
  my_balance_before: !Uint  # Balance before the loan
  my_balance_after: !Uint   # Balance after the loan
 
variables:
  loan_taker: !Address      # Address of the loan recipient
 
workflow:
  # Load the next participant (loan taker)
  - loan_taker: vm.load(vm.pid++, this.account)
  - my_balance_before: weth.balanceOf(this.account)
  - erc20.transfer(loan_taker, my_balance_before)
 
  # Temporarily pause and pass control to the next script
  - vm.continue()
 
  - my_balance_after: weth.balanceOf(this.account)
  - require(my_balance_after >= my_balance_before)

Note:
A subsequent signed intent can use the tokens, but must ensure sufficient tokens are returned.