Execution & costs.

A quote is an observation

A displayed price does not guarantee the execution of every quantity at that price. A market order prioritizes execution but can encounter worse prices as it reaches available liquidity. A limit order constrains price but may remain unfilled. Before comparing hypothetical outcomes, state which order and fill assumptions the calculation uses.

Record the time, contract month, bid–ask spread, and intended quantity. Volume describes activity over a period, while depth describes available quantities around prices at a particular moment. Neither is a promise about the next transaction. A venue ranking built from one snapshot can hide this limitation.

Build a full lifecycle cost record

Separate entry and exit fees, bid–ask costs, potential slippage, funding, rolls, and currency conversions. Label each component as known, variable, or assumed. An unavailable cost is not zero. A meaningful comparison holds exposure and holding period reasonably consistent rather than comparing unrelated contract counts.

For a fictional $10,000 position, assume $4 to open, $4 to close, and $12 of combined execution cost. The illustrative total is $20 before any funding, financing, or rolling cost. Changing the execution assumption to $30 raises that subtotal to $38. The example shows sensitivity to assumptions, not actual provider pricing.

Keep funding separate from price results

A payment received by a perpetual holder does not establish the position’s total profit. Price losses or other costs may exceed it, and the rate can change direction. The futures and perpetuals guide works through a small hypothetical assessment and explains why extrapolating one interval can be misleading.

When using market statistics, inspect their definitions and methodology. The research paper Reconciling Open Interest with Traded Volume in Perpetual Swaps studies reporting inconsistencies in a historical sample. Its results are not a current recommendation about any venue. They illustrate why a reported number and an independently validated measure are different things.

Record outcomes independently of the thesis

An execution log should preserve the actual contracts, quantities, prices, fees, and times. Keep the market view in a separate note. That prevents a favorable narrative from changing the record of what happened or obscuring incomplete execution. A hypothetical learning exercise should be labelled just as clearly so that it cannot be confused with realized performance.

Use the contract comparison page to structure further questions and the risk center to examine account, counterparty, and operational issues. There is no trading interface on this site; these materials help readers understand mechanics rather than simulate an executable order.