Estimate the cost of swapping out and immediately back
Budget an out-and-back token conversion while distinguishing independent snapshot quotes from a sequential change to the same pool.
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Fees & trade costs — page 2
Compare the amount received after fees, gas and execution costs, with worked examples.
48 guides · Page 2 of 3
How failed attempts change the cost of completing a swap
Add paid failed attempts to the cost of a completed swap and distinguish observed attempt costs from uncertain success probabilities.
How fee rounding changes very small swap calculations
Show how integer token units and display rounding can alter very small fee calculations without implying an extra fee.
How much better must a quote be to justify extra gas?
Calculate how many extra output tokens a route must offer before its additional gas cost is economically justified.
How much can you swap while keeping a separate gas reserve?
Solve a swap budget that preserves native tokens for execution and distinguish the estimated charge from the spending reserve.
How to evaluate a zero-fee swap claim
Evaluate what a zero-fee swap statement actually excludes and compare final proceeds after remaining execution costs.
Include approval costs in a first-swap comparison
Include only the approval transactions needed for a current swap and distinguish paid setup from signing an authorization message.
Include the cost of leaving a position in a trade budget
Include a size-specific exit scenario in a trade budget without treating today’s sell quote as guaranteed future liquidity.
Input fee or output fee: which amount is the percentage applied to?
Understand how charging a percentage on input, gross output or an added payment changes the actual amount received.
Is a fee already included in the quoted output?
Determine whether a quoted output already includes a charge and avoid subtracting the same swap fee twice.
Keep a reproducible record of a swap-cost comparison
Record the quote inputs, fee boundaries and transaction evidence needed for someone else to reproduce a swap-cost comparison.
Measure a buy-sell spread from executable quotes
Calculate a comparable buy-sell spread using matched token quantities and avoid combining unrelated trade sizes or timestamps.
Measure costs when only part of an intended trade completes
Report the cost of completed fills and the remaining unfilled quantity without treating untouched assets as an execution loss.
Measure negative slippage after a completed swap
Measure adverse quote-to-fill changes in output quantity and report network fees separately from execution slippage.
Price impact and slippage: a numerical comparison
Use one hypothetical swap timeline to separate initial price impact from adverse quote-to-fill change.
Reconcile a quote, a receipt and wallet balance changes
Reconcile a completed swap across accepted quote, transaction costs and token balances before attributing a discrepancy.
Separate market movement from avoidable execution loss
Use matched reference observations to separate market movement during execution from a route’s relative price deterioration.
Should a past approval fee affect today's route choice?
Distinguish a past approval payment from costs still required when choosing a new route for the next swap.
Use a cost range when gas and quotes can change
Build favorable and adverse swap-cost scenarios when output quotes and network estimates can change before execution.
What a useful swap-fee breakdown should show
Identify the fee details needed to audit a crypto swap quote: payer, recipient, asset, base, inclusion and timing.