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Centralized–decentralized exchange (CEX–DEX) arbitrage is not a guaranteed way to make money. It attempts to buy an asset where it is temporarily cheaper and sell it where it is more expensive, but the visible price gap is only a candidate opportunity. Trading fees, bid–ask spreads, automated-market-maker (AMM) price impact, gas, slippage, transaction ordering, settlement delays, inventory exposure and rebalancing costs can eliminate the apparent profit before both trades complete.
A CEX usually executes against an order book inside the venue’s systems, while a DEX commonly prices swaps from an on-chain AMM pool. Because the two legs have different execution and settlement conditions, you must estimate net proceeds for the exact asset, venues, chain, order sizes and timing—not compare two displayed prices.
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What CEX–DEX arbitrage actually does
In a simple cross-venue trade, an arbitrageur buys an asset on the cheaper venue and sells it on the more expensive venue. The two transactions may involve a CEX and a DEX, two CEXs, two DEX pools, or several venues. This article focuses on the CEX–DEX path, where the market structures differ most.
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A centralized exchange commonly matches orders in an order book. A market order consumes available bids or asks at successive prices; a limit order may receive a better price but might not fill. The venue records the trade in its internal ledger. Execution can be fast, but the exchange’s custody, withdrawal rules, API behavior, outages and counterparty condition remain relevant.
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How the DEX leg works
A DEX commonly uses an AMM pool. Your swap changes the pool’s token balances, so the execution price moves with your trade size and the pool’s liquidity. The transaction must be submitted to a blockchain, included in a block and finalized according to that chain’s rules. The quoted output can change before inclusion, and a transaction can fail or revert while still creating a cost in some circumstances.
Why a screen spread is not profit
The CEX quote may describe the best displayed order, not the quantity you can actually fill. The DEX quote may exclude or separately display gas, and its output is affected by price impact and slippage. A transfer between venues may take long enough for the gap to close. A 2025 empirical framework also notes that only the DEX leg is directly observable on-chain, making complete CEX–DEX profit measurement difficult: Measuring CEX-DEX Extracted Value and Searcher Profitability.
CEX and DEX: the relevant differences
| Dimension | Centralized exchange (CEX) | Decentralized exchange (DEX) |
|---|---|---|
| Trading mechanism | Usually a venue-managed order book and internal execution | Usually an AMM pool whose price responds to trade size and pool liquidity |
| Explicit trading costs | Trading fee, bid–ask spread and execution price | Pool fee, gas, price impact and slippage |
| Timing and settlement | Trade execution may be rapid; withdrawals and transfers are separate processes | Transaction inclusion and blockchain settlement add latency and uncertainty |
| Main exposures | Custody and counterparty risk, execution risk and inventory risk | Smart-contract and chain risk, gas volatility, transaction ordering and price impact |
| Potential structural advantage | Deep liquidity and rapid execution on major venues | Non-custodial interaction, relative anonymity in some settings and interoperability with DeFi applications |
These are tendencies, not guarantees. Liquidity, fees, congestion, asset design, trade size and execution method can reverse the practical advantage for a particular trade.
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Which costs determine whether a spread is real?
Calculate expected net proceeds for both legs. A useful expression is:
Expected net profit = sale proceeds − purchase cost − CEX fees − DEX pool fee − gas − CEX spread/execution loss − AMM price impact − slippage − failed-transaction costs − transfer/rebalancing cost − inventory funding cost
Use the fee tier and execution method that will apply to the actual order. Do not substitute a venue’s headline fee for the taker or maker rate your account receives.
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CEX trading fee and spread
A market order can pay the displayed spread and consume several order-book levels. The relevant input is the volume-weighted fill price for your intended quantity, plus the applicable maker or taker fee. A limit order may reduce the fee or improve price, but waiting for a fill creates additional timing risk and may leave only one side of the arbitrage executed.
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The pool charges a fee according to its fee tier. That fee is deducted from the swap and is separate from gas and price impact. If the asset trades through multiple pools or a routing system, include every pool fee and any routing effect in the quote.
Gas as a size-sensitive fixed cost
Gas is paid for blockchain computation and inclusion. For a small trade, the same transaction cost consumes a large percentage of the notional; for a large trade, its percentage burden falls. A 2026 Management Science study found that gas places a significant burden on relatively small trades and is associated with persistent arbitrage deviations, while DEX transaction costs can be more competitive for larger trades. The result is study-specific, not a current universal quote: Barbon and Ranaldo, “On the Quality of Cryptocurrency Markets: Centralized vs. Decentralized Exchanges”.
Ethereum.org describes an extreme competitive case in which searchers for some DEX arbitrage opportunities may pay “90% or even more” of MEV revenue in gas. That is an illustrative high-competition example, not an average cost: Ethereum.org’s MEV documentation.
AMM price impact and slippage
Price impact is the movement caused by your own trade against the pool’s liquidity. Slippage is the difference between the quoted output and the execution you ultimately receive, including movement while the transaction waits. A thin pool can make a seemingly attractive price unusable at the required size.
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Transfer and rebalancing costs
If you move coins between venues after each trade, include network fees, withdrawal fees, processing delays and the risk that the spread disappears during transit. Some traders pre-position inventory on both sides to avoid transfer latency. That removes one delay but ties up capital and exposes both balances to price movements, venue restrictions and funding costs.
Failed, reverted and abandoned transactions
Include the cost of a transaction that is submitted but fails, reverts or is displaced by a price move. A protective minimum-output setting can prevent an unacceptable fill, but the transaction may still consume gas. Cancellation, replacement and retry transactions can add further costs.
How to evaluate a CEX–DEX opportunity step by step
- Define the complete route. Specify the CEX account, trading pair, order type, DEX, chain, pool or router, token direction and intended notional. Record whether the CEX balance and wallet already hold the required assets.
- Measure executable CEX prices. Read the order book at the quantity you intend to trade. Estimate the volume-weighted average fill and add the account’s actual fee tier. Do not use a last-traded price or a single top-of-book quote.
- Request a size-specific DEX quote. Record expected output, pool fee, minimum acceptable output, gas estimate and the quote’s expiration or block context. Check the pool’s available liquidity and token decimals.
- Convert every cost into one currency. Express gas, fees, spreads and expected slippage in the same quote asset or fiat value. Use the gas price and asset prices expected at submission, while recognizing both can change before inclusion.
- Model timing. Estimate CEX execution time, wallet signing, propagation, expected block inclusion and confirmation requirements. Stress the calculation with a price move during that interval.
- Choose an inventory plan. Decide whether to pre-fund both sides or transfer after execution. Account for the amount of capital stranded at each venue and the time and fee required to restore target balances.
- Apply a safety margin. Reject the trade unless expected proceeds exceed all known costs plus a buffer for adverse price movement, gas changes, partial fills and failed transactions.
- Define the unwind. Before submitting, specify what happens if only one leg fills, the DEX transaction misses its limit, the CEX order partially fills, or a withdrawal is delayed. An unplanned leftover position is a directional trade, not risk-free arbitrage.
- Reconcile actual results. Record CEX fills and fees, transaction hashes, gas paid, DEX output, failed attempts and inventory changes. Compare realized net proceeds with the pre-trade estimate.
Why timing, MEV and transaction ordering matter
The two legs do not settle in the same environment. A CEX can execute internally in milliseconds, while a DEX transaction waits for propagation, inclusion and settlement. During that gap, another trader may remove the spread or move the pool price.
DEX arbitrage is a well-known MEV opportunity. Ethereum.org states that it is “the simplest and most well-known MEV opportunity” and therefore “the most competitive.” Searchers compete for priority and inclusion, often by adjusting transaction fees. Historical work documents priority-gas auctions and transaction-ordering competition: Flash Boys 2.0.
Higher fees can improve the probability of inclusion but reduce the trade’s expected return. A private transaction path or specialized execution arrangement may change who sees an order first, but it does not remove price, contract, chain or inventory risk. Never assume that a profitable quote remains executable after broadcasting it.
Inventory and settlement risk
Pre-positioned inventory
Holding the base and quote assets on both venues enables near-simultaneous orders and avoids waiting for a transfer. The trade-off is capital efficiency: balances sit idle until an opportunity appears. If the asset price moves while inventory is unhedged, the value of the holdings changes. A 2026 preprint using Binance and Uniswap V2 data reports positive inventory risk and relationships among price discrepancies, liquidity and gas fees: He, Yang and Zhou, “Arbitrage on Decentralized Exchanges”.
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Transfer-after-trade execution
Using one venue as the source and transferring after each cycle can reduce idle capital, but the transfer itself becomes part of the strategy. Withdrawal queues, chain congestion, token-specific transfer behavior and address checks can leave you with exposure after only one leg has completed.
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Partial fills and failed legs
An order that fills only partially can leave an imbalanced position. The same occurs if a CEX order executes but the DEX swap fails, or if a DEX swap executes while the CEX order misses. Predefined maximum position sizes, cancellation rules and an unwind venue are essential controls.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Liquidity and trade-size limits
Liquidity determines how much of the displayed spread you can capture. On a CEX, depth is visible in the order book but can disappear when other traders update orders. On a DEX, the pool’s reserves determine the AMM curve and therefore the marginal price. A low-liquidity token may show a large nominal difference while supporting only a small executable amount.
A BIS report gives one historical illustration: the Tether–ETH relative bid–ask spread on a popular DEX was reported as up to 30 basis points wider than on a CEX. That observation belongs to the report’s market and period, not to all assets or current venues: BIS, “DeFi risks and the decentralisation illusion”.
Decentralized market structures can exhibit greater price impact as decentralization increases, according to research by Malamud and Rostek: “Decentralized Exchange”. Treat a quoted spread as capacity-dependent: calculate the net result at $100, $1,000 and any larger size you could realistically execute rather than extrapolating linearly.
Custody, smart-contract and chain trade-offs
CEX custody and counterparty exposure
Assets left on a CEX are generally held through the venue. Access depends on its solvency, withdrawal policy, account controls, API availability and operational security. A fast matching engine does not eliminate these exposures.
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DEX protocol and blockchain exposure
A DEX transaction gives you direct control of the wallet, but you rely on the smart contract, token code, wallet software, RPC infrastructure, validators and chain consensus. Contract bugs, oracle issues, chain reorganizations, congestion and malicious tokens can affect execution. The BIS highlights validator concentration and front-running concerns in DeFi in its discussion of decentralization risks.
Privacy and interoperability are not free
Non-custodial interaction can reduce the information you disclose to a centralized venue and makes composability with other DeFi applications possible. It also means you are responsible for keys, approvals, signing domains, address accuracy and transaction settings. These are different risks, not a universal safety advantage.
What the empirical evidence can—and cannot—tell you
A 2025 study covering 19 months, from August 2023 through March 2025, examined CEX–DEX extracted value and searcher profitability. It reports that these trades can use less than 2% of block space while contributing more than 15% of total block value, within the study’s scope and cited prior work. Because CEX execution occurs off-chain, the authors estimate parts of profitability indirectly rather than observing every trader’s complete account statement.
The reviewed studies do not establish a typical net return for an individual retail trader after all fees, failed attempts, funding and rebalancing. They show how costs and risks behave in particular samples; they do not prove that a quoted spread is profitable today or that one venue type always wins.
Is arbitrage between a CEX and a DEX profitable?
It can be profitable for some participants and trades, but profitability is conditional. The opportunity must survive both legs’ executable prices, fees, gas, price impact, slippage, timing, MEV competition and inventory costs. Professional searchers may have faster data, automated execution, pre-funded balances and infrastructure that an occasional trader does not. A positive displayed spread alone is insufficient evidence.
Which is cheaper: a CEX or a DEX?
There is no fixed winner. For small swaps, gas can dominate the DEX cost; for larger swaps, AMM price impact and slippage can dominate. A CEX may offer deep order-book liquidity but charge a spread and trading fee, while a DEX may have a lower or higher effective cost depending on the chain, pool, congestion and size. Compare total effective cost for the exact route rather than a posted fee schedule.
Practical controls before placing a trade
- Use current, size-specific order-book and AMM quotes.
- Set a DEX minimum-output limit that reflects the maximum acceptable slippage.
- Confirm token contract addresses, chain selection and wallet approvals.
- Keep enough native chain token for gas, including a retry or replacement buffer.
- Check CEX withdrawal, deposit, maintenance and API status before relying on a transfer.
- Cap exposure when either leg can partially fill.
- Record the transaction hash, CEX order ID, fees and realized inventory after every cycle.
- Test the operational path with a small amount before increasing size.
The Bottom Line
CEX–DEX arbitrage is a market-neutral objective, not a risk-free trade. The correct decision comes from a size-specific, timing-aware net-cost calculation that includes both venues, the chain and the capital required to rebalance. If the spread does not remain positive after those costs and a safety margin, there is no arbitrage to take.
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