Write the constraint in one sentence
“I can spend at most 1,000” asks how much you can receive within that complete budget. “I need to receive 100 units” asks how much each route charges to deliver that quantity. Decide which statement describes your purchase before ranking quotes. Receiving more and spending less can point to different options without either calculation being wrong.
All figures below are hypothetical. They explain the comparison but do not establish available order sizes, current prices or a platform's limits. The actual amount and quantity must fit the conditions shown for your account.
A cash limit includes outside charges
Suppose route A charges 990 in the order and 10 separately, delivering 400 units. Route B charges 1,000 with no outside charge and delivers 398 units. Both use the same total budget, so A delivers more in this example.
If A instead charges 1,000 in the order while the separate 10 still applies, it needs 1,010. It no longer belongs in a comparison labelled “spending the same 1,000.” Obtain a new quote using an affordable order amount and check the new received quantity. Omitting the additional charge from the calculator would make the input wrong, even if the resulting unit cost looked attractive.
For a required quantity, specify the destination
A requirement to receive 100 units in an external wallet differs from holding 100 in an exchange account. A later withdrawal may change the delivered quantity. Define the destination first and request quotes for the same net quantity at that destination.
If A delivers 100 for a total of 252 and B delivers 100 for 250, B costs 2 less. That cash difference can be subtracted directly. If B delivers only 99, describing it as saving 2 omits the lower delivery amount. The wallet delivery guide covers this boundary in more detail.
Do not scale a small quote without its conditions
Effective unit cost describes the quoted order. A fixed charge, a size limit or a changing execution price can prevent a larger order from using the same ratio. Multiplying a small order's unit cost by any desired quantity is an estimate under stated assumptions, not a replacement for a new quote.
For example, with an assumed price of 2 per unit and an outside charge of 4 per order, buying 100 units costs 204, or 2.04 each. Buying 200 at the same assumed price costs 404, or 2.02 each. Multiplying 2.04 by 200 would overcount the fixed charge by 4. Actual prices may also change with size.
When equal-quantity quotes are unavailable, keep the real spending and quantity for each quote and describe only the observed unit-cost difference. A maximum budget does not require you to spend every remaining unit of cash. Quantity steps may leave a balance, and that balance is still your money. Use the comparison tool with the original values rather than inventing a fee to make both totals equal.