CoWSwap vs ParaSwap
Neutral on-chain benchmarking of slippage, revert rates, and overall execution quality.
CoWSwap shows tighter execution than ParaSwap on ClearTrace's on-chain slippage benchmark on Ethereum, 81.1 vs 69.1 out of 100 (a 12.0-point edge), measured across 15,280 and 5,919 benchmarked transactions there. Slippage, revert rate, and MEV exposure are scored separately. The ordering is not the same on every chain these two share: Arbitrum (ParaSwap ahead by 2.2); Base (within measurement noise, 0.9 points). ClearTrace publishes one chain rather than a blend, so read this as a finding about Ethereum. (data as of September 29, 2026)
Protocol Scorecard
| CoWSwap | ParaSwap | |
|---|---|---|
| Slippage Score (0-100) | 81.1 Ethereum |
69.1 Ethereum |
| Trades Analyzed Ethereum |
15,280 | 5,919 |
CoWSwap and ParaSwap are both DEX aggregators: rather than holding liquidity themselves, they split each order across many underlying pools to find the best available price. Because both compete on routing quality, the difference between them shows up in execution (realized slippage and MEV exposure) far more than in their headline rates.
Across the flow ClearTrace benchmarked, CoWSwap posted a slippage score of 81.1/100 versus 69.1/100 for ParaSwap, a clear edge of 12.0 points on Ethereum. Ethereum is ClearTrace's publication chain: ClearTrace compares a pair on its publication chain when both venues are benchmarked there, and otherwise on the shared chain carrying the most data on the smaller side. Either way the comparison is one chain, not one venue's all-chain rollup set against another's, because two rollups cover different chains. The ordering is not the same on every chain these two share: Arbitrum (ParaSwap ahead by 2.2); Base (within measurement noise, 0.9 points). ClearTrace publishes one chain rather than a blend, so read this as a finding about Ethereum. The score reflects realized slippage only, derived from median slippage versus a minute-level off-chain reference price (Dune prices.usd, an interpolated 5-minute exchange-aggregate feed and not a VWAP), where a higher number means lower slippage. The median is taken over individual fills, while the counts below are distinct transactions, and one transaction can contain several fills. MEV exposure and revert rates are tracked as separate metrics. CoWSwap was measured over 15,280 benchmarked transactions (71% of its benchmarked flow) and ParaSwap over 5,919 benchmarked transactions (36% of its benchmarked flow).
The other axis is reliability, but it is not one we will rank these two on. CoWSwap and ParaSwap settle differently, so their on-chain revert rates are not comparable: CoWSwap is a batch auction venue, where the user signs an order and a solver settles it in a batch, so orders that cannot be filled never become transactions at all; ParaSwap is a router venue, where the user signs and submits the swap transaction, so a failed swap fails on-chain and is counted. CoWSwap's on-chain revert rate is therefore structurally near zero regardless of how reliably it fills, and putting that number next to a router's would overstate its reliability rather than measure it. ClearTrace ranks revert rates only within an execution model. For a like-for-like reliability read, compare CoWSwap and ParaSwap each against venues that settle the way they do; the live aggregator leaderboard tags every venue with its execution model.
On this data, CoWSwap holds the stronger slippage score on Ethereum, but the gap reflects routing and slippage differences rather than one venue being universally better. That edge is a statement about Ethereum. Results shift with trade size, token pair, and market conditions, and MEV exposure and revert rates are separate considerations. Scores update on each data refresh; see our methodology for the full approach.
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Frequently Asked Questions
Which has better execution quality, CoWSwap or ParaSwap?
Based on ClearTrace's slippage score (median slippage vs a minute-level off-chain reference price from Dune prices.usd, which is not a VWAP) on Ethereum, ClearTrace's publication chain, CoWSwap edges out ParaSwap, 81.1/100 versus 69.1/100 (a 12.0-point gap). ClearTrace compares the two on one shared chain rather than setting one venue's all-chain rollup against another's. The ordering is not the same on every chain these two share: Arbitrum (ParaSwap ahead by 2.2); Base (within measurement noise, 0.9 points). ClearTrace publishes one chain rather than a blend, so read this as a finding about Ethereum.
Does CoWSwap or ParaSwap offer better MEV protection?
ClearTrace publishes a slippage-based score and per-aggregator revert rates, not a per-aggregator MEV-protection score. On slippage, CoWSwap was tighter on Ethereum (~18.9 bps vs ~30.9 bps). For MEV specifically, the dashboard surfaces detected sandwich activity as a separate metric.
Is CoWSwap or ParaSwap better for large trades?
For large orders, aggregators such as CoWSwap can split a trade across multiple pools to reduce price impact, which often helps on size. The right venue still depends on the specific pair and amount. The live dashboard tracks current execution quality.
What is the revert rate of CoWSwap vs ParaSwap?
A revert is a swap transaction that fails on-chain: the trader pays gas but gets no fill. ClearTrace does not publish a revert-rate comparison for CoWSwap vs ParaSwap. CoWSwap and ParaSwap settle differently, so their on-chain revert rates are not comparable: CoWSwap is a batch auction venue, where the user signs an order and a solver settles it in a batch, so orders that cannot be filled never become transactions at all; ParaSwap is a router venue, where the user signs and submits the swap transaction, so a failed swap fails on-chain and is counted. CoWSwap's on-chain revert rate is therefore structurally near zero regardless of how reliably it fills, and putting that number next to a router's would overstate its reliability rather than measure it. ClearTrace ranks revert rates only within an execution model. Each venue's revert rate is published on the ClearTrace aggregator leaderboard alongside its execution model, and ranked only against venues that settle the way it does.