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DeFi Lending Protocol

Aave Flash Loans — Uncollateralized DeFi Loans

Borrow any amount with no collateral — if you pay it back in the same transaction. Aave flash loans are one of DeFi\'s most powerful primitives.

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aave.protocol Live
Total TVL$14.5B
Cumul. Deposits$71T+
Networks12+
Security Audits15+
AAVE Token16M max supply
Fee Share100% to stakers
Current VersionAave v4 (2026)
Flash Loans0.09% fee
About

Aave Flash Loans

Aave flash loans allow anyone to borrow any available amount from Aave liquidity pools — with no collateral — as long as the borrowed amount plus a fee (0.09%) is repaid within the same Ethereum transaction. If the loan is not repaid, the entire transaction reverts as if it never happened. This atomic nature makes flash loans possible without any credit risk to the protocol.

// protocol.stats
Protocol TypeNon-Custodial Lending
TVL$14.5B
Cumul. Volume$71T+
Networks12+
Supported Assets30+
Stablecoin APY3-8% variable
AAVE Staking100% fee share
Flash Loan Fee0.09%
Versionv4 (2026)
GovernanceAAVE DAO
Features

Why Use Aave?

The most battle-tested DeFi lending protocol — supply, borrow, flash loans, GHO, and now 100% fee sharing for AAVE stakers.

[01]
⚡
No Collateral Required
Borrow any amount from Aave pools — ETH, USDC, WBTC — with zero collateral.
[02]
🔄
Single Transaction
Borrow and repay happen atomically in one block. If repayment fails, everything reverts.
[03]
💸
0.09% Fee
Aave charges 0.09% of the borrowed amount as a flash loan fee.
[04]
🤖
Developer Tool
Flash loans are primarily used by developers via smart contracts — not accessible through the UI.
[05]
📊
Use Cases
Arbitrage between DEXes, liquidation of Aave positions, one-transaction collateral swaps.
[06]
🏆
Market Leader
Aave processes the highest flash loan volume in DeFi — billions in daily volume.
Guide

How to Use Aave Flash Loans

Step-by-step from wallet connection to earning yield and staking AAVE.

01

Understand the Atomic Constraint

Flash loans work because of Ethereum\'s atomicity — either the entire transaction succeeds (borrow + use + repay) or the entire thing reverts. No partial states.

02

Understand the Fee

Aave charges 0.09% of the borrowed amount. For a $1M flash loan, the fee is $900. Your strategy must profit more than this fee plus gas costs.

03

Write or Use a Flash Loan Contract

Flash loans require a smart contract that implements Aave\'s IFlashLoanReceiver interface. The Aave developer docs provide templates.

04

Test on Testnet First

Always test flash loan strategies on a testnet (Sepolia) before deploying to mainnet. A bug means the transaction reverts — you lose gas, not principal.

05

Common Use Cases

Arbitrage (buy low on DEX A, sell high on DEX B in one tx), collateral swaps (change your Aave collateral type in one tx), and self-liquidation (liquidate your own undercollateralized position advantageously).

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FAQ

Frequently Asked Questions

Everything about Aave Flash Loans.

Can anyone use Aave flash loans?
+
Flash loans require writing or using a smart contract — they are not accessible through the Aave UI. You need either Solidity development experience or an existing flash loan tool/aggregator.
Are flash loans used for attacks?
+
Flash loans have been used in some DeFi attacks — they allow attackers to temporarily acquire large capital to manipulate oracle prices. Aave\'s own oracle design (Chainlink TWAP) is specifically hardened against flash loan manipulation. The tool itself is neutral.
What is the maximum flash loan size on Aave?
+
The maximum flash loan size for any asset is the total available liquidity of that asset in Aave\'s pools. For USDC on Ethereum mainnet, this is often hundreds of millions of dollars.
What is the Aave flash loan fee?
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Aave charges 0.09% (9 basis points) of the borrowed amount as a flash loan fee. This fee goes to Aave protocol treasury and, since April 2026, is distributed to AAVE Safety Module stakers.
What is a collateral swap using flash loans?
+
A collateral swap lets you change your Aave collateral in one transaction. Example: your collateral is ETH but you want WBTC as collateral instead. Flash loan USDC → repay ETH-backed borrow → withdraw ETH → sell for WBTC → deposit WBTC as new collateral → borrow USDC → repay flash loan. All in one transaction.
Reviews

What Users Say

DeFi Developer
★★★★★

"Flash loans are the most underutilized primitive in DeFi for non-developers. The collateral swap use case alone is worth learning — saves significant gas versus manual multi-step processes."

Arbitrage Bot Operator
★★★★★

"Aave flash loans have the best liquidity depth for large arbitrage opportunities. The 0.09% fee is well-calibrated — low enough to enable profitable strategies, high enough to compensate the protocol."

Security Researcher
★★★★☆

"Flash loans as an attack vector are real but overstated. The protocols that get exploited via flash loans have price manipulation vulnerabilities — flash loans just provide the capital. Fix the oracle, the flash loan is not a problem."

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