Fixed vs Float Rate Crypto Swaps: Quotes, Limits and Networks Explained (2026)

By Swappr Editorial (GSPTeck) · Published 2026-10-08 · Last verified 2026-10-08

Most instant crypto swap services, including the swap flow inside the Swappr app for Android, ask you one small question before you confirm: Fixed Rate or Float Rate? The toggle looks minor, but it decides when your exchange rate is set, how much time you have to send your coins, how strict the deposit amount is, and whether the number you see on screen is a promise or an estimate. This guide explains both options in plain language, shows which one fits common situations, and walks through the checks that matter more than the rate itself: the network, the limits, the receiving address and the deposit. It is general educational information, not financial or investment advice, and it does not predict prices.

Fixed rate vs float rate in one minute

An instant swap has two moments that are usually a few minutes apart. First you create the order: you choose the coin you send, the coin you want, and the amount. Then you actually send the coins, and the service waits for the blockchain to confirm your transaction before it pays out. Crypto prices move in between. The rate type decides who carries that movement.

Fixed rate locks the exchange rate when you create the order. If your deposit arrives on time and matches the order, you receive the amount you were quoted. The price of that certainty is a tighter window and, at most services, a higher fee.
Float rate sets the final rate later, after your transaction has the required network confirmations. If the market moves your way you receive a bit more; if it moves against you, a bit less. The amount shown when you create the order is an estimate.

Two columns comparing fixed and float rates: a fixed rate is locked when the order is made, pays the quoted amount, has a short window to send and needs the exact amount; a float rate is set after confirmations, can move up or down, usually has a lower service fee and shows an estimate — Fixed vs float: the difference is when the exchange rate is set and who carries the price movement in between.

Swappr shows swaps as “powered by FixedFloat” on its deposit screen, so FixedFloat’s own rules are a useful reference. Its public FAQ (checked 2026-10-08) says a fixed rate freezes for 10 minutes, the deposit must arrive within that time and match the order amount exactly, and if the market moves by more than 1.2% before your transaction appears on the network you are asked to choose a refund or continue at the market rate. For float orders, the FAQ says the rate is set within 10 minutes after your transaction receives the required confirmations. The same FAQ lists a 1% service fee for fixed and 0.5% for float, plus the network fee. Treat those figures as the provider’s published terms on that date, not as a guarantee: always read the estimated amount and any fee shown in the app right before you confirm.

How the swap form works, step by step

Whatever app or website you use, an instant swap form asks for the same information. In Swappr it is one screen: a “from” coin, a “to” coin, the amount, the receiving address and the Fixed/Float toggle, followed by a deposit screen.

Pick the pair, including the network. Many coins exist on more than one blockchain. Tether alone lists USD₮ on Ethereum, Tron (TRC20), Solana, TON and several other chains on its supported protocols page. “USDT (TRC20)” and “USDT (BEP20)” are different deposit and payout routes, even though the token has the same name.
Enter an amount inside the limits. Each pair shows a minimum and a maximum. Below the minimum, the network fee would eat most of the swap; above the maximum, the service may not have enough liquidity at that rate. Stay comfortably inside both.
Read the estimated amount and choose the rate type. This is the moment to compare fixed and float. If the number matters to the cent, fixed is the safer choice; if you are flexible, float may cost less.
Paste the receiving address. It must belong to a wallet that supports the coin on the network you selected. Swappr’s address field literally carries the reminder “Always double check!”, and that is good advice for every service.
Send the exact deposit. After you tap “Swap now”, the app shows a deposit address with a QR code and copy buttons. Send the exact amount, from a wallet on the right network, as a single transaction, then tap “Sent”.

Four-step flow of checks before sending a swap deposit: the pair including the network on both sides, an amount inside the minimum and maximum limits, a receiving address that matches the receive network, and a deposit of the exact amount, on time, in one transaction — Four checks before you send: pair and network, limits, address, and an exact single deposit.

When a fixed rate makes sense

Choose fixed when the receiving amount has to be right, not roughly right:

You owe a specific amount. Topping up an account to a set balance or paying someone a quoted sum is easier when the payout is known in advance.
The market is moving fast. A locked rate protects you from a sudden move during the confirmation wait, as long as you send within the window.
You can send immediately. Fixed orders reward speed. Have the sending wallet open and funded with enough for the amount and the network fee before you create the order.

The trade-off is strictness. If you send late, send a different amount, or split the deposit into two transactions, a fixed order usually stops being “fixed” and you are offered a refund or a market-rate exchange instead. Also remember that your wallet may deduct its own fee from the amount you type. Check that the amount that will actually leave your wallet equals the order amount.

When a float rate makes sense

Choose float when flexibility matters more than an exact payout:

You are not sure when your transaction will confirm. On a busy network, or if you choose a low fee, confirmation can take a while. Ethereum’s gas documentation explains why low-fee transactions wait longer, and Bitcoin wallets that support replace-by-fee let you bump a stuck transaction. Float orders tolerate that delay better.
The amount is small or flexible. If a small move in either direction doesn’t matter to you, a lower service fee may be worth more than a guarantee.
You want to avoid a refund round-trip. Because float doesn’t depend on a tight window, a slow deposit is less likely to end in a refund that costs you a second network fee.

The trade-off is uncertainty. The payout can be lower than the estimate you saw. If you would be unhappy with any downside, that is a sign to pick fixed and send promptly, or to wait for a calmer moment.

Grid of six situations and the rate type that fits: exact amount needed uses fixed, paying an invoice uses fixed, a busy network suggests float or waiting, unsure timing suggests float, a flexible amount works with either, and a fast market suggests fixed with a prompt deposit — A quick guide to picking a rate type for common situations.

The network matters more than the rate

The difference between fixed and float is usually a fraction of a percent. Sending on the wrong network, or to an address that can’t receive the coin, can cost the whole amount, and blockchain transfers generally can’t be reversed. Before every swap, check that both sides line up:

Sending side. The network your wallet uses for the coin must match the deposit network on the order. You also need the network’s own fee coin: sending TRC20 USDT needs Tron resources, as explained in Tron’s resource model, and sending BEP20 tokens needs BNB for gas on BNB Smart Chain.
Receiving side. The address you paste must be for the network selected in the “to” field. Some wallets and exchanges also require a memo or destination tag for certain coins; if your receiving account shows one, don’t skip it.
Small first. For a new pair, a new wallet or a large amount, a small test swap costs a little extra in fees and can save you from an expensive mistake.

Two columns listing what must line up when the same coin exists on several networks: on the sending side the wallet network, the gas coin for the fee, the exact amount after wallet fees and a single transaction; on the receiving side the network chosen in the swap form, the matching address format, any memo or tag, and a wallet that supports that network — Same coin, different networks: both the sending and receiving side have to match the order.

Common mistakes to avoid

Pasting an address from memory or chat history. Copy it fresh from the receiving wallet and compare the first and last characters after pasting.
Sending from an exchange that batches withdrawals. Some exchanges process withdrawals in batches or after a delay, which can push you past a fixed-rate window. Float is more forgiving here.
Ignoring the limits. Amounts under the minimum may not be processed as a normal swap. Read the min and max next to the pair.
Trusting a “guaranteed profit” pitch. A swap converts one coin into another; it doesn’t earn yield. Anyone promising returns for using a swap service is a red flag. The FTC’s guide to cryptocurrency scams lists the usual patterns.

FAQ

Is a fixed rate always better?

No. It gives you a known payout but usually costs more and requires a timely, exact deposit. Float is often cheaper and more forgiving of slow confirmations, but the final amount can be lower or higher than the estimate.

What happens if I send the wrong amount on a fixed order?

At FixedFloat, per its FAQ, a deposit that doesn’t match the order or arrives late leads to a choice between a refund and continuing at the market rate. A refund is sent back minus the network fee.

Does Swappr charge to install?

No. Swappr is free to install from Google Play, and the listing notes that it contains ads. Before you confirm a swap, double-check the pair, amount, destination and any fee or rate shown in the app.

Can I cancel a swap after sending?

Once your transaction is on the blockchain you can’t pull it back. That is why the address and network checks above come before you tap “Sent”.

Sources

More Swappr guides: the Swappr blog · how Swappr works.

Not financial, legal, or investment advice. Swappr does not guarantee profits, yields, APYs or returns. Rates, fees, limits and supported networks change; the figures quoted from FixedFloat’s FAQ were checked on 2026-10-08, and the app shows the current estimate before you confirm. Swappr is not CoinDrop and is not IOU. Last verified 2026-10-08.