A limit order sets the price and expiry at which you agree to trade; slippage tolerance sets how much a swap may move while it is being processed. In Uniswap’s web app, a limit order may remain unfilled if no eligible filler can execute it. For a regular Uniswap Protocol swap, tighter slippage tolerance can cause a transaction to fail if the price moves too far, while wider tolerance accepts more movement. Neither setting guarantees a favorable trade.
How do I set a limit order for ETH?
These steps apply to the Uniswap web app. Other exchanges and wallet interfaces may use different labels or order mechanics. Confirm the network and exact ETH asset you intend to trade before submitting.
- Connect your wallet to the Uniswap web app and select Limit.
- Choose the token you will pay and the token you want to receive. Check that the selected ETH asset and network are correct.
- Enter the amount to trade, then set the execution price. The app’s quick-price options are relative to the current market price.
- Choose an expiry, review the order details, submit it, and sign the wallet message.
After signing, the order is made available to third-party fillers. It is an agreement to trade at your chosen price, not an instruction to execute immediately at any price.
Why a limit order may not fill
A market price reaching your chosen price does not guarantee completion. Execution depends on a filler being available and able to match the order, as well as sufficient liquidity, token balance, and viable network costs. The order may remain open until it is canceled or expires.
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What slippage tolerance should I use?
There is no single percentage that is right for every ETH swap. For Uniswap Protocol v2, v3, and v4 swaps, slippage tolerance is the maximum price movement accepted between submitting a transaction and its execution. Choose only a level of movement you are willing to accept, based on the live quote and the trade’s conditions.
Check the quoted output amount, pool liquidity, and price impact before signing. A tighter tolerance limits the movement you will accept but can cause the swap to fail if the price changes while it is pending. A broader tolerance permits more movement and therefore a less favorable execution than the original quote may be possible.
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For an exact-input trade, tolerance is applied in terms of the output token; for an exact-output trade, it is applied in terms of the input token. UniswapX has different execution semantics: its tolerance does not cap order spread in the same way as classic Protocol swaps. Do not assume that changing the tolerance has the same effect across both routes.
Why did my ETH swap fail?
For a regular Protocol swap, one possible reason is that the price moved beyond the slippage tolerance before execution. A tighter tolerance can make this more likely, but widening it is not automatically the right fix: doing so allows a greater price change. Recheck the quote and decide whether the possible execution still meets your needs before retrying.
A limit order has different failure conditions: it may not execute because no filler can match it, liquidity or balance is insufficient, or network costs make execution unviable. A limit order can remain open rather than complete simply because the market appears to have touched its price.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Is slippage the same as price impact?
No. Price impact is the expected effect of your trade size on the pool price; larger trades or thinner liquidity can increase it. Slippage tolerance is the amount of additional price movement accepted between submission and execution while a transaction is pending. A trade can have material price impact in its quote even before any further movement occurs.
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| Control or measure | What it describes | If conditions do not fit | Key caveat |
|---|---|---|---|
| Limit order | Agreed execution price and expiry | The order can remain open or expire without a match | Filling can depend on a third-party filler, liquidity, network costs, and balance. |
| Swap slippage tolerance | Maximum accepted price movement during pending execution | A swap may fail if movement exceeds tolerance; a wider range permits more movement | UniswapX does not use tolerance to cap spread in the same way as classic Protocol swaps. |
| Price impact | Expected effect of trade size on pool price | Large trades or thin liquidity can increase the impact | It is distinct from movement while a transaction is pending. |
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