Slippage

Reading depth

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BeginnerCore purpose and mental modelPractitionerAdds mechanisms and economicsEngineer or auditorAdds state and verification

Dependency check

Advanced detail assumes prerequisite knowledge

Before using practitioner mechanisms or engineer and auditor checks, review any unfamiliar dependency. These paths come from canonical depends_on relationships; Web3 Academy does not track completed lessons.

Review 6 dependencies

• AssetRequired through Asset versus claim

  1. Slippage
  2. Swap
  3. Decentralized exchange
  4. Asset versus claim
  5. Asset

• ClaimRequired through Asset versus claim

  1. Slippage
  2. Swap
  3. Decentralized exchange
  4. Asset versus claim
  5. Claim

• TokenRequired through Asset versus claim

  1. Slippage
  2. Swap
  3. Decentralized exchange
  4. Asset versus claim
  5. Token

• Asset versus claimRequired through Decentralized exchange

  1. Slippage
  2. Swap
  3. Decentralized exchange
  4. Asset versus claim

• Decentralized exchangeRequired through Swap

  1. Slippage
  2. Swap
  3. Decentralized exchange

• SwapDirect prerequisite

  1. Slippage
  2. Swap

Slippage is the difference between a reference or expected trade price and the price at which the trade actually settles.

Category: TradingOpposed arrows category cue

System record

Start with the economic purpose, participants, resources, and entitlements before studying implementation detail.

Why it exists

Slippage measures execution uncertainty created by changing markets, routing, transaction delay, partial fills, ordering, and available liquidity.

Traditional-finance analogy

Implementation shortfall is the closest comparison recorded for this concept.

Where the analogy stops

• On-chain slippage can include deterministic curve movement and adversarial transaction ordering in addition to ordinary market movement.
• A slippage-tolerance control is an execution bound that may cause a revert or partial fill; it is not a prediction of the final price.

Main actors

• ActorTrader
• ActorCounterparty, pool, maker, or solver
• ActorRouter or settlement contract
• ActorArbitrageur or transaction-ordering actor

Assets and claims

Assets — controlled or transformed resources

Assets are resources the mechanism moves, holds, values, or transforms.

• AssetQuoted input and output amounts
• AssetSettled input and output amounts

Claims — entitlements and corresponding dependencies

Claims are rights to value, repayment, redemption, control, or another party's performance; each depends on an obligation or system that must honor it.

The structured entry records no separate entitlement or liability for this concept.

Slippage compares an expected or reference trade price with the price that actually settles.

Why it exists

Quotes become stale, markets move, routes change, orders consume liquidity, and transactions wait for inclusion. Slippage measures the resulting execution difference. It is not one universal number until the reference, direction, amount, fees, route, and time are specified.

Traditional-finance analogy

Implementation shortfall is a useful analogy. On-chain trading adds public pending transactions, adversarial ordering, deterministic curve movement, gas, reverts, and atomic or solver-based settlement. A tolerance field is a contract bound, not the realized metric itself.

Slippage versus related costs

Table: Slippage versus related costs

Quantity	What it isolates	Example cause
Price impact	Movement caused by the order against venue depth	Consuming a pool curve or order book
Market movement	Price change while execution is pending	New information or other trades
Ordering effect	Change caused by transaction placement	Front-running or sandwiching
Trading fee	Explicit amount charged by the venue	Pool, protocol, router, or solver fee
Gas	Blockchain execution and inclusion cost	Transaction computation and ordering
Realized slippage	Reference-to-settlement difference under a stated convention	May combine several rows above

Do not add all rows blindly: a quoted output may already include price impact and fees. Define the quote convention before decomposing the difference.

Measurement

One signed convention is:

slippageFraction = (executionPrice - referencePrice) / referencePrice

Both prices must quote the same asset direction, such as USDC per ETH. Under that convention a higher execution price is worse for an ETH buyer but better for an ETH seller. A cost-positive implementation should condition on trade direction or compare actual and reference output for a fixed input. The fraction is unitless; multiply by 100 only when labelling a percentage.

Step-by-step slippage measurement

1. Declare the traded amount, asset direction, route, reference price, quote convention, and observation time.
2. Obtain an executable quote and identify whether it already includes price impact and venue fees.
3. Authorize a minimum output, maximum input, deadline, or equivalent execution boundary.
4. Observe the amounts and costs that actually settle, or record that the trade reverted or remained unfilled.
5. Compare settlement with the reference using one consistent price direction and percentage convention.
6. Attribute price impact, market movement, ordering, fees, gas, and route changes without double counting.

State, bounds, and flows

For exact input, the trader normally authorizes a minimum output. For exact output, the trader authorizes a maximum input. A deadline limits quote age. These controls turn excessive slippage into a revert or unfilled order, subject to the venue’s partial-fill and refund rules.

Table: State, bounds, and flows

Outcome	Asset state	Order or refund claim	Immediate cost bearer
Settled within bound	Actual input and output become final	Atomic order ends	Trader bears execution difference
Atomic bound exceeded	Asset transfer reverts	No persistent spot-order claim remains	Trader can still bear gas and delay
Partial fill	Only filled amounts settle	Remainder persists, expires, or refunds	Depends on venue and order terms
Deadline expired	No new trade assets settle	Order expires or refund remains due	Trader bears opportunity cost and gas

Capital flow is actual input, output, fee, and gas. Information flow includes the reference quote, route, timestamp or block, and price source. Claim flow can leave an open order, refund, or partial-fill entitlement when settlement is not fully atomic. Return flow is absent from slippage itself; any counterparty, arbitrage, or strategy gain must be traced separately. Risk flow reaches the trader when the authorized bound is too loose or the trade fails when it is too tight. Makers and LPs can bear the opposite inventory effect.

Return source and loss allocation

Slippage is normally a trading cost relative to the chosen reference, not a new asset. The counterparty, arbitrageur, LP, solver, or later market move may capture the other side, but no single recipient is guaranteed. Failed execution still can impose gas and opportunity cost.

Engineer or auditor lens

Test price inversion, token decimals, fee inclusion, exact-input/output rounding, stale quotes, changed routes, partial fills, minimum output, maximum input, deadlines, refunds, fee-on-transfer tokens, and front-running scenarios. User interfaces should not label price impact, fee, and slippage as the same value.

Uniswap v2’s pricing documentation provides one implementation-specific example of amount bounds and price safety. Its mechanics do not define every order book, RFQ, auction, or solver system. The documentation was reviewed 2026-08-10.

Common misunderstandings

• “Slippage tolerance predicts slippage.” It specifies an execution boundary.
• “All slippage is price impact.” Market movement, ordering, routing, and quote conventions also matter.
• “Zero slippage means a free trade.” Fees, gas, spread, and opportunity cost can remain.

Compare the narrower price-impact measure.

Machine-readable model

Key equations

Canonical expressions come from the structured concept record. KaTeX renders the notation, while the plain-text expression and variable table keep its meaning and units inspectable without JavaScript. Read the narrative above for the model's domain, assumptions, and rounding rules.

1. Equation 1

   $$\mathrm{slippageFraction} = \frac{\left(\mathrm{executionPrice} - \mathrm{referencePrice}\right)}{\mathrm{referencePrice}}$$

   Plain-text equation: slippageFraction = (executionPrice - referencePrice) / referencePrice

   Variables and units for equation 1

   Symbol	Meaning	Unit
   slippageFraction	Slippage Fraction	dimensionless fraction (1 = 100%)
   executionPrice	Execution Price	quote-asset units per base-asset unit
   referencePrice	Reference Price	quote-asset units per base-asset unit

Assurance contract

Security properties

These structured statements define desired behavior. Their stable IDs can bind tests, invariants, specifications, audit findings, or proof results without turning descriptive review advice into an assurance claim.

Desired · not evaluated: No test, audit, or proof result is implied until scoped evidence is linked to this property.

1. SP-01Desired · not evaluated

   The reference and execution prices use the same asset direction, units, and fee convention

2. SP-02Desired · not evaluated

   Exact-input settlement enforces minimum output and exact-output settlement enforces maximum input

3. SP-03Desired · not evaluated

   Expiry and partial-fill behavior match the user-authorized order model

4. SP-04Desired · not evaluated

   User interfaces distinguish estimated slippage, realized slippage, price impact, fees, and gas

Prerequisites

Direct dependencies recorded by this concept's canonicaldepends_on relationships.

• SwapPath 23

  A swap exchanges a specified amount of one asset for another under a quoted route, price rule, fee, and settlement condition.

Learn next

Concepts that directly depend on this one, ranked by the recommended learning path. Check each page for additional prerequisites.

No concept directly builds on this page in the current graph; use the guided learning paths to choose another branch.

Knowledge check

Quiz

Answer in your own words, then open the model answer.

What problem does Slippage exist to address?

Model answer

Slippage measures execution uncertainty created by changing markets, routing, transaction delay, partial fills, ordering, and available liquidity.

Mark as understood