NFT Collateral Loan Repayment Tool

WHAT IT DOES

This tool enables NFT holders to repay their NFT-backed loans, reclaiming their NFT collateral after the loan is fully repaid. Repayment covers both the principal loan amount and any accrued interest. Once repaid, the NFT is released from the lending contract and returned to the borrower. It connects to your wallet and reads the lending contract address, loan ID, loan amount, interest accrued, total repayment, repayment status, repayment history, and timestamps. The tool signs and submits transactions to repay NFT-backed loans, pay principal and interest, release collateral, record repayment metadata, and emit repayment events.

HOW TO USE

1. Connect your wallet using the wallet bridge (supports MetaMask, WalletConnect, and other EVM-compatible wallets).

2. Select the target network that matches your lending contract deployment.

3. Enter the lending contract address and the loan ID, then click "load contract" to initialize the connection.

4. Click "fetch loan details" to retrieve the loan amount, interest accrued, total repayment amount, and repayment status.

5. Review the loan details — the total repayment is the sum of the principal and accrued interest.

6. Click "validate repayment" to verify that the loan is active and the repayment amount is valid.

7. Click "check repayment history" to view your past repayments.

8. Review the total repayment amount, principal, and interest before executing.

9. Click "repay loan" to sign and submit the transaction that repays the loan and releases your NFT collateral.

TECHNICAL MECHANISM

The tool uses ethers.js v5.7.2 to interact with any EVM-compatible lending contract that implements a standard repayment interface (getLoanDetails(uint256) view returns (uint256, uint256, uint8, uint256), getTotalRepayment(uint256) view returns (uint256), repayLoan(uint256) external payable, getRepaymentHistory(address) view). The getLoanDetails view returns the principal amount, accrued interest, status, and loan timestamp. The getTotalRepayment view calculates the total amount due (principal + interest). The repayLoan function accepts the repayment amount as value and validates that it equals the total due. The function transfers the payment to the lender, releases the NFT collateral back to the borrower, and updates the loan status to "repaid." The contract maintains a history of repayments, storing timestamps and amounts for audit purposes. Transaction handling follows EIP-1559 gas price calculations using receipt.effectiveGasPrice for accurate cost reporting. Repayment metadata is recorded both in the contract's history and locally for the user's reference.

WHAT IT CANNOT SEE

This tool operates purely on-chain and cannot verify off-chain repayment eligibility — it does not check whether the borrower has the right to repay the loan or if there are any restrictions. It cannot validate loan terms — the tool does not verify that the interest rate, duration, or other terms are correct. It cannot detect loan default risks — the tool cannot predict whether the borrower will default in the future. It cannot ensure collateral return — while the contract should return the NFT, the tool cannot guarantee that the NFT is returned correctly. The tool also cannot guarantee loan closure — the contract may fail to close the loan due to bugs or other issues.

PLEASE NOTE

This tool works exclusively with EVM-compatible blockchain networks (Ethereum, Polygon, Arbitrum, Optimism, Base, etc.). It requires the lending contract to implement the repayment interface described above. All transactions incur gas fees paid by the connected wallet. The tool maintains no persistent storage — all state is refreshed from the blockchain on each session. Repaying a loan is a significant financial decision — ensure you have sufficient funds to cover both the principal and the accrued interest. The total repayment amount is calculated on-chain and may differ from the original loan amount. Always verify the repayment amount before executing. If you do not repay the loan before the due date, your NFT collateral may be liquidated.