The Best Flash Loans of

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A quick guide to flash loans

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Flash loans let you borrow assets with no collateral, provided you repay within the same transaction. If repayment fails, the entire transaction reverts, so lenders face no residual risk.

How flash loans work

1
Borrow

Your contract calls the pool’s flash-loan function for one or more assets.

2
Execute

Perform arbitrage, refinance debt, or liquidate, using the borrowed funds.

3
Repay + fee

Return principal and fee before the transaction ends.

4
Revert if not

If repayment fails, state rolls back and nothing is borrowed.

Popular use cases

DEX arbitrage

Exploit price differences across AMMs/CEXs atomically without upfront capital.

Bundle swaps; protect against MEV with private relays.

Collateral refinancing & liquidations

Repay one position and re-open another with better terms in one transaction, or perform liquidations efficiently.

Mind oracle delays and slippage; simulate before sending.

How to compare flash-loan platforms

Liquidity & assets

Depth across stables & blue chips; multi-asset flash loans; pool fragmentation.

Fee schedule

Per-loan fee %, gas costs, bundle/relay costs; rebates on higher volume.

Developer UX

SDKs, examples, TypeScript bindings, testnets, simulators, multicall support.

Security posture

Audits, bug bounties, pause/timelock, oracle design, reentrancy protections.

Risks & safeguards

  • Execution risk: price moves, MEV reordering, or gas spikes can break routes.
  • Smart-contract risk: reentrancy, approval misuse, or faulty callbacks.
  • Oracle risk: stale prices → bad fills/liquidations; prefer robust oracles.
  • Compliance risk: region-specific rules for programmatic trading/arb.

Frequently asked questions

No collateral is required because repayment happens within the same transaction. If repayment fails, the whole transaction reverts automatically.

Attackers can combine flash loans with oracle manipulation or logic bugs to drain pools. Defenses include robust oracles, rate limits, and well-audited contracts.