Different sources, different prices
A quote reflects two things: the liquidity a provider can reach and the path it chooses through that liquidity. One provider might have deeper liquidity for your exact pair. Another might route through an intermediate token to find a better rate. A third might price the gas cost differently. Each of those choices moves the final number, so the same swap honestly produces different answers.
None of this means a provider is lying or getting it wrong. They're all giving an accurate quote from their own vantage point. The vantage points simply differ, and that difference is the whole reason comparison is worth doing.
The main reasons quotes vary
A handful of factors explain most of the spread you'll see between providers on the same trade.
- Liquidity depth: deeper liquidity for a pair means less price impact on your size, which lifts the output.
- Routing: a shorter or smarter path, sometimes through an intermediate token, can extract more value than a direct one.
- Gas assumptions: how a provider estimates and prices network cost changes the net figure you're left with.
- Slippage settings: a wider tolerance can fill on a worse path, while a tight one may quote or fill differently.
- Timing: quotes are live, so two fetched seconds apart can already differ as the market moves.
- Fees and spread: each provider's own cost structure is baked into the number it shows.
Why net output is the number that matters
Because these factors pull in different directions, the headline rate can mislead. A provider can show an attractive top-line price and then hand back less after gas and fees than a plainer quote would. The figure worth comparing is net output: the amount that actually lands in your wallet once every cost is subtracted.
Judging by net output also makes cross-chain quotes comparable, where bridge fees and gas on two networks can swing the real result far from the sticker price. Compare what arrives, not what's advertised.
Comparing is the answer, and an aggregator automates it
Since quotes legitimately differ, the way to a fair swap isn't to trust one provider. It's to compare them and take the best net result. That's exactly what an aggregator does: it fetches many quotes at once, normalizes them, subtracts costs, and ranks by what you'd actually receive.
Multiswap compares nine routing engines and ranks by net output, so the variation between providers works in your favor instead of being a guessing game. You see the best available route rather than hoping the one you happened to pick is competitive. Because quotes are live, that best route can shift moment to moment, which is another reason to compare at the moment you swap.