Smart Contracts

Deployments

Since Polymarket’s smart contracts are deployed on Polygon, ours are as well. The deployment addresses are:

Name	Network	Address
PolyLend	Polygon Mainnet	0x9BF793E4759154D84313485ca8b95fB933Aac1d6
InterestLib	Polygon Mainnet	0xA2FD6a65Abdef81975199EA2caB28918ca138adD

Source Code

The GitHub repository contains smart contracts and associated files needed for development, testing, and deployment

GitHub - poly-lend/polylend: PolyLendGitHub

The main smart contract is located here:

polylend/src/PolyLend.sol at main · poly-lend/polylendGitHub

Roles

• Borrower

  • Owns a conditional token position.

  • Requests a loan and accepts an offer.

  • Can repay early at any time.

• Lender

  • Provides USDC liquidity.

  • Makes loan offers.

  • Can call a loan after its minimum duration.

  • Can transfer a called loan to themselves (refinancing) or reclaim collateral if the auction fails.

Public Functions

1. function request(
       uint256 _positionId,
       uint256 _collateralAmount, 
       uint256 _minimumDuration, 
       bool _useProxy
   ) external returns (uint256);

2. function cancelRequest(uint256 _requestId) public

3. function offer(
       uint256 _requestId, 
       uint256 _loanAmount, 
       uint256 _rate
   ) external returns (uint256)

4. function cancelOffer(uint256 _id) public;

5. function accept(uint256 _offerId) external returns (uint256);

6. function call(uint256 _loanId) external;

7. function repay(uint256 _loanId, uint256 _repayTimestamp) external;

8. function transfer(uint256 _loanId, uint256 _newRate) external

9. function reclaim(uint256 _loanId, bool _useProxy) external;

Helper Functions

1. function getAmountOwed(
       uint256 _loanId, 
       uint256 _paybackTime
   ) public view returns (uint256);

2. function _calculateAmountOwed(
       uint256 _loanAmount, 
       uint256 _rate, 
       uint256 _loanDuration
   ) internal pure returns (uint256);

3. function _calcualteFee(
       uint256 _loanAmount, 
       uint256 _amountOwed
   ) internal pure returns (uint256);

External contracts

• IConditionalTokens (ERC-1155)

  • Represents Polymarket conditional token positions.

  • Collateral is identified by (positionId, collateralAmount).

• ERC20 USDC

  • The stablecoin being lent/borrowed.

• ISafeProxyFactory

  • Used to derive smart-account wallets (e.g., Gnosis Safe) for borrowers/lenders when _useProxy = true.

• ERC1155TokenReceiver

  • Base contract so PolyLend can safely receive ERC-1155 collateral.

Storage

uint256 public constant MAX_INTEREST;       // ~1000% APY ceiling
uint256 public constant AUCTION_DURATION;   // 1 days
uint256 public constant PAYBACK_BUFFER;     // 1 minutes
uint256 public constant FEE_PERCENT;        // 10_00 = 10% of yield (bps)
uint256 public constant ONE_HUNDRED_PERCENT = 100_00; // 100% bps

IConditionalTokens public immutable conditionalTokens; // Polymarket conditional token positions
ISafeProxyFactory public immutable safeProxyFactory; // Used to derive smart-account wallets
ERC20 public immutable usdc; //The stablecoin being lent/borrowed
address public immutable feeRecipient; // Fee recipient address

uint256 public nextLoanId; // Loan counter
uint256 public nextRequestId; // Request counter
uint256 public nextOfferId; // Offer counter

mapping(uint256 => Loan) public loans; // Loans map
mapping(uint256 => Request) public requests; // Requests map
mapping(uint256 => Offer) public offers; // Offers map

Events

For integration / indexing:

• LoanRequested(uint256 id, address borrower, address borrowerWallet, uint256 positionId, uint256 collateralAmount, uint256 minimumDuration)

• LoanOffered(uint256 id, uint256 requestId, address lender, uint256 loanAmount, uint256 rate)

• LoanAccepted(uint256 id, uint256 requestId, uint256 offerId, uint256 startTime)

• LoanCalled(uint256 id, uint256 callTime)

• LoanTransferred(uint256 oldId, uint256 newId, address newLender, uint256 newRate)

• LoanRepaid(uint256 id)

• LoanReclaimed(uint256 id)

• LoanRequestCanceled(uint256 id)

• LoanOfferCanceled(uint256 id)

Errors

• CollateralAmountIsZero

• InsufficientCollateralBalance

• CollateralIsNotApproved

• OnlyBorrower

• OnlyLender

• InvalidRequest

• InvalidOffer

• InvalidLoan

• InsufficientFunds

• InsufficientAllowance

• InvalidRate

• InvalidRepayTimestamp

• LoanIsNotCalled

• LoanIsCalled

• MinimumDurationHasNotPassed

• AuctionHasEnded

• AuctionHasNotEnded

These make it easy for front-ends and bots to surface precise error messages.