# DeFi lending pools: supply claims, debt and available liquidity A DeFi lending pool lets suppliers place assets in a reserve that eligible borrowers can use. In Aave V3, suppliers receive aToken claims and borrowing creates debt subject to collateral or authorized credit-delegation rules. Interest, available liquidity and market settings affect what each position can do. Evidence: [Aave V3 Pool](https://aave.com/docs/aave-v3/smart-contracts/pool); [Aave V3 tokenization](https://aave.com/docs/aave-v3/smart-contracts/tokenization) Canonical: https://degreesofsatoshi.com/encyclopedia/defi-lending-pools/ Published: 2026-10-02 Substantively modified: 2026-10-02 Independently verified by an automated reviewer: 2026-10-02T18:17:57.897Z AI-assisted research and drafting with a separate automated source-verification pass; no external expert or named human review is implied. ## Key facts - **Supply receipt:** Aave aToken balances represent supplied assets and accrued yield. ([Aave V3 tokenization](https://aave.com/docs/aave-v3/smart-contracts/tokenization)) - **Debt:** Variable debt balances include accrued interest. ([Aave V3 tokenization](https://aave.com/docs/aave-v3/smart-contracts/tokenization)) - **Withdrawal:** Available liquidity and collateral health constrain withdrawals. ([Aave V3 Pool](https://aave.com/docs/aave-v3/smart-contracts/pool)) ## Supplying and borrowing create different records Supplying 100 units to a standard Aave V3 reserve creates a supply claim denominated in that underlying asset. A separate borrower can take available units if the borrowing operation meets the applicable rules. The debt is an obligation, not another freely transferable receipt. The supplied token, aToken and debt token are distinct contracts or records. A wallet balance denominated in the same asset name can therefore represent an underlying token, a claim on a pool or an amount owed. Evidence: [Aave V3 Pool](https://aave.com/docs/aave-v3/smart-contracts/pool); [Aave V3 tokenization](https://aave.com/docs/aave-v3/smart-contracts/tokenization) ## A supply balance is different from immediately available liquidity Suppose a simplified reserve holds claims for 1,000 supplied units while 900 are currently borrowed, leaving 100 idle units before other accounting effects. A supplier with a 300-unit claim cannot infer that all 300 can be withdrawn immediately from that snapshot. The protocol also checks whether a withdrawal would leave that supplier’s own debt insufficiently collateralized. Available liquidity and account health are separate requirements. A displayed aToken balance establishes the recorded position, not an unconditional instant-exit promise. Evidence: [Aave V3 Pool](https://aave.com/docs/aave-v3/smart-contracts/pool); [Aave V3 tokenization](https://aave.com/docs/aave-v3/smart-contracts/tokenization) ## Collateral rules connect the account’s positions When supplied assets secure borrowing, removing collateral can worsen the account’s health. The protocol can reject a withdrawal that would violate its constraints. A collateral price decline or an increase in debt can also make liquidation possible. These statements describe the cited Aave V3 mechanisms, not every lending product. Isolated markets, permissioned credit and other designs can have different eligibility, risk sharing and settlement rules. Always record the market and version with a comparison. Evidence: [Health Factor & Liquidations](https://aave.com/help/borrowing/liquidations); [Aave V3 Pool](https://aave.com/docs/aave-v3/smart-contracts/pool) ## Questions ### Does a displayed supply balance guarantee instant withdrawal? No. Redemption needs available underlying liquidity and must satisfy the position’s collateral rules. An accounting claim and cash immediately available to withdraw are different quantities. Evidence: [Aave V3 Pool](https://aave.com/docs/aave-v3/smart-contracts/pool) ## Claims and scope ### defi-lending-pools-quick-answer A DeFi lending pool lets suppliers place assets in a reserve that eligible borrowers can use. In Aave V3, suppliers receive aToken claims and borrowing creates debt subject to collateral or authorized credit-delegation rules. Interest, available liquidity and market settings affect what each position can do. Scope: {"collection":"defi","dataAsOf":null,"blockHeight":null} ### defi-lending-pools-fact-supply-receipt Supply receipt: Aave aToken balances represent supplied assets and accrued yield. Scope: {"collection":"defi","dataAsOf":null,"blockHeight":null} ### defi-lending-pools-fact-debt Debt: Variable debt balances include accrued interest. Scope: {"collection":"defi","dataAsOf":null,"blockHeight":null} ### defi-lending-pools-fact-withdrawal Withdrawal: Available liquidity and collateral health constrain withdrawals. Scope: {"collection":"defi","dataAsOf":null,"blockHeight":null} ## Sources - [Aave V3 Pool](https://aave.com/docs/aave-v3/smart-contracts/pool) — Aave. Pool operations, collateral restrictions and liquidation settlement. Locator: supply; withdraw; borrow; repay; liquidationCall. Retrieved: 2026-10-02. - [Aave V3 tokenization](https://aave.com/docs/aave-v3/smart-contracts/tokenization) — Aave. Supply receipts accrue interest and debt tokens record principal plus interest. Locator: AToken; VariableDebtToken. Retrieved: 2026-10-02. - [Health Factor & Liquidations](https://aave.com/help/borrowing/liquidations) — Aave. Weighted liquidation thresholds and eligibility below health factor one. Locator: Health Factor; Managing Health Factor; Liquidation Process. Retrieved: 2026-10-02. ## Revision history - 2026-10-02: First publication after primary-source research and independent automated verification. - 2026-10-02: Expanded explanation: A supply balance is different from immediately available liquidity. Worked examples are illustrative; source checks and independent verification are recorded separately. ## Cite this entry Degrees of Satoshi editorial project. “DeFi lending pools: supply claims, debt and available liquidity.” Published 2026-10-02; updated 2026-10-02. https://degreesofsatoshi.com/encyclopedia/defi-lending-pools/