Why a fixed rate swap costs more than a floating rate one

05 September 2026

A fixed rate swap costs more than a floating rate one because the provider charges a premium for guaranteeing the rate you see on the quote screen, regardless of what the market does between clicking and confirmation. That premium is the price of certainty.

The guarantee has a price

When you select a floating rate swap, the provider quotes a rate that can shift before the transaction settles. If the market moves against you, you get fewer tokens. If it moves in your favour, you get more. The provider carries no risk either way - the final amount is whatever the market delivers at the moment the swap executes.

A fixed rate swap removes that uncertainty. The provider promises you will receive exactly the amount shown, even if the market price changes drastically during the seconds or minutes the transaction takes. To keep that promise, the provider must hedge. They either lock in a rate with another party, hold a reserve of tokens to cover adverse moves, or both. Hedging costs money. That cost is passed to you.

How the premium shows up

The extra cost of a fixed rate swap appears in one of two ways, sometimes both:

• A wider spread. The provider builds the hedging cost into the difference between the market price and the rate they offer you. A floating rate swap might have a spread of 0.5%. A fixed rate swap for the same pair might show 1.0% or more.
• A separate fee. Some providers list the fixed rate guarantee as an explicit charge, often labelled "protection fee" or "slippage protection." This sits on top of the standard swap fee.

The exact premium depends on how volatile the pair is, how long the swap takes to confirm on the destination blockchain, and how much liquidity the provider holds. For a stable pair on a fast chain, the premium might be small - perhaps 0.2% extra. For a volatile token on a slow chain, the premium can exceed 1.0%.

When the extra cost makes sense

Paying for a fixed rate is not always wasteful. It makes sense when you need to know exactly how much you will receive, because you are sending that amount onward, or because you are swapping at a specific price point that matters to your strategy. It also protects you on chains where network congestion can delay confirmation for minutes, giving the market time to move against you.

But for routine swaps where you can absorb small variance, a floating rate swap is cheaper. The difference between quoted and received is the core subject of the hub page "What a crypto swap actually costs." That page explains how spread, network fees, and rate shifts combine into the final amount you get.

The trade-off

A fixed rate swap removes one risk - price change during execution - and adds a different cost: the premium. A floating rate swap eliminates the premium and exposes you to execution risk. Neither is objectively better. The choice is about which risk you prefer to carry.

The premium exists because the provider takes the market risk instead of you. They charge for that service. The price of certainty is always higher than the price of uncertainty, because uncertainty is free and certainty requires someone to guarantee it.

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