CoW Swap vs. Across
Rift Research
Last updated
TLDR: CoW Swap is a batch-auction DEX built on CoW Protocol. Across is an intent-based interoperability protocol. Consider CoW Swap when you want MEV-protected swaps and coincidence-of-wants matching. Consider Across when you are moving canonical USDC or ETH between major chains and care about speed. Confirm the live winner on rates.gg.
What each protocol is
CoW Swap. CoW Swap is the primary interface for CoW Protocol. Users sign intents. Solvers batch them, search on-chain and off-chain liquidity, and settle in a combinatorial auction designed to protect against MEV. Opposite orders can match peer-to-peer (a coincidence of wants). Official docs: CoW Protocol Docs. App: swap.cow.fi.
Across. Across is an intents protocol for bridging and cross-chain swaps. Relayers front destination liquidity. Across advertises approximately two-second fills on supported mainnet routes; actual timing depends on the route. Its intent settlement and refund mechanisms are separate from that initial fill. Official docs: Across Docs. App: across.to.
Short version
| Dimension | CoW Swap | Across |
|---|---|---|
| Role | Batch-auction DEX on CoW Protocol | Intent-based interoperability protocol |
| Fee | Solver competition pricing; surplus-aware execution | Market-quoted relayer spread and LP fee; no separate flat protocol toll |
| Coverage | Ethereum and other CoW-supported EVM networks; cross-chain swaps exist on the UI | Supported mainnet networks, with availability determined by the exact token pair and route |
| Settlement | Batch auction through the CoW settlement contract | Canonical assets delivered by bonded relayers |
| Trust model | Non-upgradeable vault relayer and settlement contracts; solver competition | Relayer-funded fills and the settlement and dispute mechanisms of the deployed Across contracts |
| Good fit for | MEV-protected swaps and coincidence-of-wants matching | Canonical USDC and ETH transfers between supported chains |
| Docs | CoW Protocol Docs | Across Docs |
Where each fits
CoW Swap may fit when:
- MEV protection and batch-auction execution matter
- The trade is inside CoW’s supported environment
- A coincidence of wants in the batch can improve the net price
Across may fit when:
- You are moving USDC or ETH between major supported chains
- Fast destination fills matter; confirm the estimate for your route
- You want a dedicated intent rail rather than a meta-aggregator
Key differences
CoW Swap and Across should be compared on the job you need to complete: the input asset, destination asset and chain, trade size, execution method and custody assumptions. They may overlap on some routes and complement each other on others. A broader chain list or faster advertised fill does not establish a better net rate. Compare executable quotes in the same window, including gas and every underlying step.
When to use which
- Use CoW Swap when you want MEV-protected swaps and coincidence-of-wants matching.
- Use Across when you are moving canonical USDC or ETH between major chains and care about speed.
- If both can quote the same route, take the better net output after fees, time and settlement type. Check that print on rates.gg.
FAQ
Which is cheaper, CoW Swap or Across?
Neither has a universal price advantage. CoW Swap: Solver competition pricing; surplus-aware execution. Across: Market-quoted relayer spread and LP fee; no separate flat protocol toll. Compare executable quotes for the same size, destination and time window, including gas, underlying venue costs and any extra transfer. Expected output and minimum received are different figures; compare like with like.
Is CoW Swap a substitute for Across?
Only on overlapping pairs and chains. When both can quote the same route, take the better net output after fees and time. When only one supports the asset or chain, that one is the only option.
Where are the official CoW Swap and Across docs?
CoW Swap: CoW Protocol Docs. Across: Across Docs. Live rate comparison: rates.gg.
Official sources
- CoW Swap docs: CoW Protocol Docs
- CoW Swap app: swap.cow.fi
- CoW Swap — Protocol vs CoW Swap: docs.cow.fi/cow-protocol/concepts/how-it-works/protocol-vs-swap
- CoW Swap — Cross-chain swaps on CoW Swap: docs.cow.fi/cow-protocol/tutorials/cow-swap/swap-and-bridge
- CoW Swap — Order explorer: explorer.cow.fi
- Across docs: Across Docs
- Across app: across.to
- Across — Introduction: docs.across.to/introduction
- Across — Features and fill times: docs.across.to/introduction/features
- Across — API reference: docs.across.to/api-reference
Get the Best of Both With Rift
Rift is a strong alternative to choosing between CoW Swap and Across. It brings routes from both together with additional venues on supported pairs, comparing available quotes to find the best net execution for your order. You get the strengths of both through one API.
Rift adds no router fee and uses secure hardware enclaves to enforce noncustodial execution. Underlying venue fees, spreads and network costs still apply, and availability depends on the asset, chain and order size. The live quote shows the route and expected output.