The cheapest way to convert one coin into another
Every instant exchanger advertises 0% commission. One of them returns a literal zero in its API and charged us up to 2.3% below market on the same trade, at the same second.
The cheapest way to convert one coin into another
Instant exchangers — the services that convert one coin into another without an account — all advertise zero commission. The claim is true and it is not the cost. They are paid out of the gap between the rate they quote you and the rate the market is actually trading at, so the fee genuinely is zero and the price is not.
We measured it. Same pairs, same sizes, quotes requested within a few hundred milliseconds of each other, benchmarked against the mid-market rate at that moment.
What we found
Averaged across every pair and size, the gap below the market rate came out as: Alfacash 0.91%, ChangeNOW 1.07%, Exolix 1.17%, and Godex 1.89%, with individual quotes up to 2.3% below market.
Godex's page title reads "Lowest Fees" and its API literally returns a fee field of zero. Both statements are accurate. It was also the most expensive service we could measure, by a wide margin.
A correction we made before publishing
Our first draft was unfair to Godex, and the fix is worth describing because it changes how you should read any comparison like this.
Godex's endpoint returns a fixed rate by default, and a fixed rate legitimately costs more than a floating one — you are paying for certainty that the rate will not move while the transaction confirms. Comparing its default quote against everyone else's floating quote would have manufactured a markup that was not there. So we re-ran the entire measurement asking Godex for a floating rate too. It narrowed the gap by about 0.2 points. Godex is still last, and now the number is honest.
When an instant exchanger is the right tool
For a one-off conversion between assets on different chains, where opening an exchange account and completing identity verification would take days, paying about 1% for a service that works in ten minutes is a reasonable trade. Nobody should pretend otherwise.
It stops being reasonable when it becomes a habit. 1% on every conversion, several times a year, is a large amount of money for a convenience you could have arranged once.
The cheaper routes
- An exchange you already hold an account with. Trading through an order book costs 0.10% to 0.26% at the venues in our exchange rating — a quarter to a tenth of the exchanger spread.
- A decentralised exchange, if both assets live on the same chain. Our DEX rating measured effective fees as low as 0.0506% at the cheapest venue, though gas costs must be added.
- Not converting at all. A surprising share of swaps exist to reach a chain rather than to change exposure, and a bridge or a different on-ramp is often cheaper.
How to check a quote yourself
Take the amount the service says you will receive, divide by the amount you are sending, and compare that to the mid-market rate on any price site. The difference is the cost. It takes thirty seconds and it is the only number that matters — no advertised commission is relevant to it.
The fee really is zero. The price is not. Compare what you receive against the market rate, never against the fee.
The short version
Instant exchangers cost roughly 1% to 1.9% depending on the service, all of it hidden in the rate. That is defensible for a one-off cross-chain conversion and expensive as a habit. If you already have an exchange account, use it; if both assets share a chain, a DEX is cheaper still. And always price a quote against the market rate rather than against a commission figure.
Frequently asked questions
What is the cheapest way to swap crypto?+
If you already have an exchange account, trading through its order book costs about 0.10% to 0.26% at the venues we measured — far less than instant exchangers, which averaged 0.91% to 1.89% below market. If both assets are on the same chain, a decentralised exchange can be cheaper still, though network fees apply.
Do instant exchangers really charge 0% commission?+
Yes, and it is not the cost. These services are paid out of the difference between the rate they quote and the rate the market is trading at, so the commission field is genuinely zero while the price you receive is 1% or more below market. Compare the amount you receive against the mid-market rate.
Is Godex cheap?+
No. Its page advertises lowest fees and its API returns a fee of zero, and it gave the worst rate of the four services we could measure — averaging 1.89% below market, with individual quotes up to 2.3% below, on the same pairs at the same second as its competitors.
Why is a fixed rate more expensive than a floating rate?+
Because the service is absorbing the risk that the market moves while your transaction confirms, and it prices that certainty in. In our measurement, asking Godex for a floating rate rather than its default fixed rate narrowed the gap by about 0.2 percentage points.
How this was reported
ChainWatch Daily is independent and reader-funded. Stories are written by named journalists and checked against primary sources before publishing. We disclose holdings, correct errors in the open, and never accept payment for coverage.
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