Arbitrage is buying and selling equivalent assets across markets to capture a price difference. The visible spread is not the profit: fees, execution price, liquidity, slippage, borrow or inventory costs, transfer delay, and the risk that one leg fails all matter.
Cross-venue arbitrage
A trader may buy an asset on one venue and sell it on another, but the displayed quotes can change before both orders fill. Moving funds between exchanges adds delay and withdrawal costs, so firms often keep capital on both venues. Wrapped or bridged versions of a token can also carry different custody, redemption, and smart-contract risks; they are not automatically identical exposures.
DEX arbitrage and MEV
On decentralized exchanges, a searcher can detect that pools quote different prices and try to trade against the gap. A carefully constructed atomic transaction can make several on-chain steps succeed together or revert together, reducing the risk of being left with only one completed leg. It does not remove competition, network fees, liquidity limits, failed-transaction costs, or the possibility that the expected net return is negative. On Ethereum, DEX arbitrage is one competitive form of MEV.
Arbitrage is not the same as a sandwich attack
Arbitrage trades seek to capture a price difference and can help bring pool prices closer together. A sandwich attack instead places trades around a user’s transaction to exploit its price impact or slippage tolerance. Both can involve transaction ordering and MEV, but their mechanics and effects on users differ.
Risks and misconceptions
“Risk-free” describes an idealized price relationship before costs and execution constraints. In real markets, stale quotes, partial fills, chain congestion, contract failures, changing collateral values, and competition can erase a spread. Arbitrage can be carried out by automated systems, but a bot does not guarantee profitable execution.
Social Media Sentiment
- A December 2021 r/defiblockchain post described a user’s self-reported arbitrage strategy and a later liquidation; replies questioned execution, collateral, and the assumption that price differences would remain available. It is one DeFiChain account, not a measure of typical arbitrage outcomes. the December 2021 DeFiChain arbitrage and liquidation discussion on Reddit
Last updated: 2026-10
Related Terms
See Also
- What Is MEV?
- Why Algorithmic Stablecoins Keep Failing
- Are Layer 2 Networks Actually Decentralized?
- ChangeNOW
Sources
- Ethereum.org: Maximal Extractable Value (MEV) — Explains DEX arbitrage as a competitive MEV opportunity and describes searchers, transaction ordering, and gas costs.
- Uniswap Docs: Swaps — Documents how swaps execute against pool reserves and why execution price depends on the trade and pool state.