Smart contract risk
JustLend’s contracts are audited, but no DeFi protocol is risk-free. Only supply assets you can afford to leave locked in the protocol.
JustLend
JustLend is the primary decentralized lending and borrowing protocol on TRON, serving as the flagship application of the JUST ecosystem. By utilizing an algorithmic interest rate model and shared liquidity pools, it enables users to earn variable yield on supplied assets or access on-demand liquidity against diversified collateral without the need for traditional intermediaries.
Domain: justlend.org
Core Concepts
Section titled “Core Concepts”Supply and Borrow
Section titled “Supply and Borrow”| Action | What happens | You earn / pay |
|---|---|---|
| Supply | Deposit an asset into the pool | Variable supply APY (interest) |
| Borrow | Take a loan against your collateral | Variable borrow APR (interest owed) |
| Withdraw | Reclaim your supplied assets | — |
| Repay | Return borrowed funds + interest | — |
Assets are supplied as collateral and automatically earn interest while deposited. You can borrow a different asset against that collateral — this is the standard pattern for leveraging staked positions or accessing liquidity without selling.
Supported Assets
Section titled “Supported Assets”JustLend supports TRX, USDT, USDD, WBTC, ETH (TRC-20 bridged), and JST, among others. The asset list and current APY/APR rates are displayed on the JustLend dashboard.
Health Factor
Section titled “Health Factor”The health factor (HF) is the single most important number when borrowing. It measures how safe your collateral position is.
Health Factor = (Total collateral × liquidation threshold) / Total borrowed| Health Factor | Status |
|---|---|
| Above 2.0 | Safe — significant buffer before liquidation |
| 1.5 – 2.0 | Moderate risk — monitor if markets are volatile |
| 1.0 – 1.5 | Elevated risk — consider repaying or adding collateral |
| Below 1.0 | Liquidation. Position is partially liquidated. |
Supplying an Asset
Section titled “Supplying an Asset”- Open justlend.org and click Connect Wallet in the top right. Approve the connection in TronLink.
- On the Dashboard, find the asset you want to supply in the Supply column on the left panel.
- Click the asset name. A supply dialog opens, showing the current supply APY and your available balance.
- Enter the amount you want to supply and click Supply.
- If this is the first time you are supplying this asset, you will first be asked to Approve it (a TRC-20 approval granting JustLend permission to move your tokens). Confirm the approval transaction in TronLink, then wait for it to confirm.
- Confirm the supply transaction. Your supplied amount appears in your Dashboard summary.
Once supplied, your balance in JustLend grows in real time as interest accrues. You can withdraw at any time as long as it does not push your health factor below 1.0.
Enabling Collateral
Section titled “Enabling Collateral”Supplied assets are not automatically eligible as collateral. You must explicitly enable each asset for collateral use.
- On the Dashboard, find your supplied asset in the “My Supplies” panel.
- Toggle the Collateral switch to the on position.
- Confirm the transaction. The asset now counts toward your borrowing power.
Only enable collateral for assets you genuinely want to use as backing for loans. Disabling collateral for an asset reduces your borrowing capacity.
Borrowing
Section titled “Borrowing”- Ensure you have collateral supplied and enabled (see above).
- In the Borrow column on the right panel, find the asset you want to borrow.
- Click the asset. The borrow dialog shows the current APR, your available borrow limit, and what the resulting health factor will be.
- Enter the borrow amount. JustLend shows in real time how the amount affects your health factor. Do not borrow up to your maximum limit — leave a meaningful buffer.
- Click Borrow and confirm in TronLink.
The borrowed asset is sent to your wallet immediately. Interest begins accruing in real time against your position.
Repaying a Loan
Section titled “Repaying a Loan”- On the Dashboard, find your open borrow position in “My Borrows”.
- Click Repay.
- Enter the repayment amount. To close a position fully, use the Max button — this accounts for accrued interest that may have added to your debt since you borrowed.
- Approve the token (if not already approved for repayment) and confirm the repay transaction.
Repaying brings your health factor back up. Once fully repaid, you can withdraw your collateral.
Interest Rates
Section titled “Interest Rates”JustLend uses an algorithmic interest rate model. Rates are not fixed — they adjust based on utilization (the ratio of borrowed to supplied assets in each pool).
- Low utilization: Low borrow APR, lower supply APY — the protocol encourages borrowing
- High utilization: High borrow APR, higher supply APY — the protocol encourages more supply
The current rates for each asset are displayed on the JustLend dashboard and update continuously.
Energy Rental
Section titled “Energy Rental”JustLend DAO provides an Energy Rental platform that allows users to obtain Energy for smart contract interactions more affordably than burning TRX. An upgraded version launched on May 16, 2024, introduced new functional capabilities.
Key Features
Section titled “Key Features”- Rent for another address: Users can rent energy for their own wallet or specify a different TRON address as the recipient.
- Energy Rental Orders: A simplified interface to monitor and manage all active rental positions in one place.
PrePay & Refund
Section titled “PrePay & Refund”During the rental process, a prepayment amount is calculated that includes both the rent and a security deposit. This is based on the Rental Amount and Duration.
PrePay Formula:
Prepay = trxAmount * max(rentalRate, stableRate) * (durationValueInSeconds + 86400 + liquidateThreshold) + fee
Upon normal termination of the rental, the remaining portion of the deposit is refunded to the user.
Minimum Refund Formula:
Refund at least = trxAmount * max(rentalRate, stableRate) * (21600 + liquidateThreshold) + fee
JST Token
Section titled “JST Token”JST is JustLend’s governance token. It is distributed to users who supply and borrow on the platform as liquidity incentives (in addition to base interest rates). JST holders can participate in governance votes on protocol parameters.
JST rewards are claimed separately from supply interest. The JustLend dashboard shows any pending JST rewards.
Risk Summary
Section titled “Risk Summary”Liquidation risk
When HF drops below 1.0, liquidators repay up to 50% of your debt and claim your collateral at a 5–15% discount (the liquidation penalty, which varies by asset). You cannot cancel a liquidation once it begins. A 20% drop in collateral value can push a fully-borrowed position to HF below 1.0 in minutes.
Variable rates
Both supply APY and borrow APR change continuously. A position that makes economic sense today may not tomorrow if utilization shifts. Check rates before and after any deposit or borrow.
Approval exposure
Supplying requires granting JustLend a TRC-20 approval. Use TRONSCAN’s Approvals tab to verify and revoke unused approvals when you exit the platform.