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Lending and borrowing on Stellar DeFi can expose users to liquidation, smart-contract failure, oracle errors, illiquid markets, bad debt, and risks tied to the assets themselves. On Blend, the documented example, the details depend on the individual pool: its assets, collateral and liability factors, oracle, liquidity, and backstop. Borrower interest is compensation for risk—not a promise that lenders will earn a return or recover their principal.
How lending and borrowing work on Blend
Borrowers provide collateral
A borrower deposits collateral and borrows an asset enabled in the selected pool. Blend’s borrower documentation describes the collateral requirement using a collateral factor (CF) and liability factor (LF): collateral value = liability value ÷ (LF × CF). Its example says a liability of $450, with CF 0.5 and LF 0.9, requires $1,000 of collateral. That is an illustration of the formula, not a recommended borrowing level or a statement of any live pool’s parameters.
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Collateral and debt can change in value. If a position no longer meets its pool’s requirements, it can be liquidated. There is no single safe collateral ratio for all Stellar lending pools; the assets and factors configured for the particular pool matter.
Lenders supply assets to a pool
Lenders deposit assets into a pool, where Blend’s smart contracts control the supplied assets. Blend says borrower interest is distributed to lenders according to utilization. A quoted rate therefore does not answer the more important questions: what assets are borrowed, how the pool values its collateral, how much liquidity remains available for withdrawals, and what happens if a debt cannot be collected. The cited documentation does not establish a current yield for any particular pool.
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Risks borrowers face
Liquidation and loss of collateral
A fall in collateral value, a rise in the value of the liability, or both can push a position below its required level. Liquidators may repay a borrower’s liability in exchange for collateral. Blend warns that the collateral claimed may be worth more than the liability repaid because of a liquidation premium. As a result, a borrower may lose more collateral than the amount needed to repay the debt alone would suggest.
Pool-specific factors and asset prices determine how much room a borrower has before liquidation. A ratio that appears comfortable under ordinary market conditions is not a guarantee against a rapid price move or a change in the pool’s conditions.
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Risks lenders face
Bad debt and impaired withdrawals
Blend’s FAQ warns that volatile assets can lead to bad debt. If liquidation proceeds do not cover liabilities and the loss exceeds the assets available to backstop the pool, lenders may lose assets. This can happen when collateral falls sharply or cannot be sold quickly enough to cover debt.
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Smart-contract and oracle exposure
Supplied assets are controlled by smart contracts, so a contract defect or exploit can cause loss. Blend says its contracts have been audited, but an audit is not a guarantee against undiscovered defects. Its value depends in part on what code and version were reviewed, whether identified issues were remediated, and whether the deployed code still matches the reviewed version.
Pools also rely on oracles to value assets. A stale, unavailable, or manipulated price can distort borrowing capacity, collateral values, and liquidation decisions. Blend advises users to assess whether a pool’s oracle contract is trustworthy and warns that oracle failure can result in loss. Oracle providers and safeguards are not necessarily the same across pools.
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Asset, counterparty, and Stellar ledger risks
A token’s market price is only one part of its risk. Its issuer, governance, redemption terms, liquidity, bridge or other dependencies, and supporting contracts may also matter. Blend’s risk framework identifies smart-contract, counterparty, and market risk among the considerations for assets used as collateral. A token being described as a stablecoin, or operating on Stellar, does not establish that it is risk-free or always redeemable at par.
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Blend also identifies Stellar ledger risk as a category to consider. Application-level safeguards do not remove risks in the underlying ledger. The cited materials do not quantify the likelihood or potential scale of ledger-level losses.
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What pool isolation and backstops can—and cannot—do
The Stellar Development Foundation’s Blend & Meru case study describes Blend’s lending pools as isolated: a user’s position in one pool is independent of their position in another, so bad debt, liquidation, or bad oracle data in one pool should not directly affect users in a different pool. This is a containment feature of the documented design, not a promise that every integration is isolated. Shared dependencies and wider ecosystem effects can remain.
The case study also describes a backstop fund for each pool. It acts as first-loss capital when liquidation proceeds do not cover liabilities, helping mitigate a shortfall. It is not insurance or a guarantee of full lender recovery: its capacity is limited, and losses can exceed it. A pool’s actual funding and rules need to be checked rather than inferred from the existence of a backstop.
How to compare pools before using one
Compare the specific pool configurations, not a protocol-level description or a single headline yield. For two or more pools, review the same dimensions side by side:
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| What to compare | Questions to check |
|---|---|
| Assets and borrowing rules | Which assets can be supplied, used as collateral, or borrowed? What are the collateral and liability factors, utilization caps, and liquidation mechanics? |
| Oracle | Which provider and contract supply prices? Which assets are covered? How does the oracle update, and what happens if prices diverge or updates stop? |
| Liquidity and liquidation capacity | What is utilization and what withdrawals are currently available? Is there enough market depth to sell collateral and clear positions under stress, not only in calm conditions? |
| Backstop | How is this pool’s backstop funded, and what are its rules and capacity? Do not treat it as guaranteed recovery. |
| Code and control | What code version is deployed? What do public audits cover, what findings were remediated, and does production match the reviewed code? Who can pause, upgrade, or change parameters, and under what governance process? |
| Assets and dependencies | Who issues or governs each token? What redemption, bridge, protocol, or other counterparty dependencies exist? How concentrated or correlated are the pool’s exposures? |
These checks are time-sensitive: configurations, liquidity, code, and control arrangements can change. Justin Rice’s Stellar Development Foundation security guidance recommends public audits tied to named code versions, documented remediation, and review after material code changes. It also calls for documented risk procedures, secure key storage, meaningful multisig thresholds, timelocks for non-urgent changes, scoped emergency powers, economic stress tests, liquidation simulations, and analysis of the cost and potential gain of oracle manipulation. These are recommendations, not evidence that every protocol follows them.
What a hardware wallet can and cannot protect
Stellar’s wallet integration documentation lists Ledger hardware wallet support, and an SDF announcement documented Stellar USDC support on Ledger Nano X, Nano S, and Nano S Plus. A hardware wallet can help protect private-key custody, but it cannot prevent pool liquidation, an oracle failure, bad debt, a smart-contract exploit, or a decline in collateral value. Check current compatibility among the asset, wallet, and DeFi interface before relying on a particular device.
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