Ratings · Measured, not sponsored
Instant crypto exchangers
All of them advertise 0% commission. We asked four of them for a quote on the same pair, at the same second, and compared it to what the market was actually paying. The commission is genuinely zero. The price is between one and two percent.
About 1.07% below mid-market across every pair and size we measured — and the only one that states its quote is all-in.
Just 0.51% on a $500 USDT→BTC swap. Also the bluntest AML terms in the category — read them before you send.
Godex’s API returns fee: "0" and its page says "Lowest Fees" — yet it quoted the widest spread we measured, about 1.89% below market. Everywhere here, the fee page is not the price.
What we did · July 14, 2026We asked every service that answers without an API key for a quote on the same pairs, at the same amounts, inside the same two-second window — and compared what each would actually hand you against the mid-market rate from a live order book. Nothing was executed. A quote is free, which is exactly why nobody funded by referrals ever runs this.
The ranking
Click any row for the quick read, or open a company for its full profile and per-criterion scores. Measured July 14, 2026. How we rate.
Our raw measurements
Mid-market taken from a live order book at the same moment, not from a spot index — an index lags, and it would smear exactly the basis points we are trying to see. Benchmark at the time of measurement: BTC $64,440, ETH $1,874. Every request in a row was fired concurrently; a row is thrown away if the responses land more than 2.5 seconds apart, because four requests sent in sequence are not a comparison of four services, they are a comparison of four moments.
| PAIR | SIZE | SERVICE | YOU RECEIVE | MID-MARKET WOULD GIVE | COST TO YOU |
|---|---|---|---|---|---|
| BTC → ETH | 0.05 | ChangeNOW | 1.699056 | 1.719750 | −1.20% |
| BTC → ETH | 0.05 | Exolix | 1.694226 | 1.719750 | −1.48% |
| BTC → ETH | 0.05 | Godex | 1.680022 | 1.719750 | −2.31% |
| BTC → ETH | 0.05 | Alfacash* | 1.704036 | 1.719750 | −0.91% |
| BTC → ETH | 1 | ChangeNOW | 33.985431 | 34.395001 | −1.19% |
| BTC → ETH | 1 | Exolix | 33.987747 | 34.395001 | −1.18% |
| BTC → ETH | 1 | Godex | 33.630378 | 34.395001 | −2.22% |
| BTC → ETH | 1 | Alfacash* | 34.081544 | 34.395001 | −0.91% |
| USDT → BTC | 500 | ChangeNOW | 0.007692 | 0.007754 | −0.80% |
| USDT → BTC | 500 | Exolix | 0.007715 | 0.007754 | −0.51% |
| USDT → BTC | 500 | Godex | 0.007612 | 0.007754 | −1.83% |
| USDT → BTC | 10000 | ChangeNOW | 0.153401 | 0.155081 | −1.08% |
| USDT → BTC | 10000 | Exolix | 0.152781 | 0.155081 | −1.48% |
| USDT → BTC | 10000 | Godex | 0.153238 | 0.155081 | −1.19% |
* Alfacash returns a gross rate with no network fee deducted and ignores the amount asked about. Its figure is an upper bound on what you would receive, not an estimate of it, and it is therefore not ranked. Publishing it as the best rate would have been the exact trick this page exists to expose.
The seven we could not measure — and why
Seven services could not be measured. Three of them (SimpleSwap, StealthEX, LetsExchange) simply need a free partner key and will be added on the next run. Two (Changelly, ChangeHero) block scripted requests at the network edge and additionally require cryptographically signed requests — meaning nobody can independently price them without their cooperation. One (FixedFloat) requires a signed key, and is notable for publishing a real fee (0.5% floating, 1% fixed) instead of claiming zero. And one (Quickex) has no public rate endpoint at all: every API path returns "Forbidden", its API subdomain does not resolve, and neither its documentation nor its own GitHub publishes one.
- Changelly — Cloudflare blocks any scripted request with HTTP 403 before it reaches the API, and the API additionally requires RSA request signing with a partner key.
- ChangeHero — Cloudflare 403 before the API is reached; also requires an HMAC-signed partner key.
- FixedFloat — Requires an API key plus an HMAC-SHA256 signature over the request body. Notably, it is one of the few that PUBLISHES a real fee (0.5% floating / 1% fixed) rather than claiming zero.
- SimpleSwap — Quote endpoint requires a free partner key; the request is otherwise valid.
- StealthEX — Quote endpoint requires a free partner key.
- LetsExchange — Quote endpoint requires a free bearer token.
- Quickex — No public rate endpoint exists: every API path returns a bare "Forbidden", the API subdomain does not resolve, and neither the docs nor the GitHub repo publish one.
HOW WE SCORED THIS — CRITERIA AND WEIGHTS+
Every service in this category advertises “0% commission”. None of them is free. They are paid out of the gap between the rate they quote you and the rate the market is actually trading at — so we asked all of them for a quote on the same pair, at the same moment, and compared each one to mid-market. That single table is the whole category.
Measured by us. We request a quote for the identical pair and identical amount from every service inside the same short window, and compare the output amount to the mid-market rate at that timestamp. The gap is the true price, expressed as a percentage — regardless of what the fee page says. Quotes only; nothing is executed, so this measurement is free and repeatable, which is exactly why we can run it monthly and nobody else does.
This category’s real danger is not the spread — it is sending coins to a no-account service that then demands identity documents before it will release them. We read the published AML policy: does it state, BEFORE you send, what triggers a hold, what is required to clear it, and what happens to your money if you refuse? A service that only discovers its KYC obligations after it has custody of your coins is marked down hard.
At what amount verification is demanded, and whether that threshold is published in advance.
Pairs that actually return a quote when asked — taken from our own measurement run, not from the marketing claim of “900+ coins”.
Fixed and floating rates are both legitimate. Presenting a floating rate as though it were a guarantee is not. We check what the quote actually commits to.
- — A pattern of funds frozen after receipt with retroactive KYC demands.
- — No published AML policy on a service that takes custody of your coins mid-swap.
Weights sum to 100. If we cannot verify a criterion, we delete it rather than score it on impressions — read the methodology.
Is there a free alternative?
If both coins are on a chain you can already reach, you do not need any of these.
The cheapest swap we measured cost about 1% of the trade. A direct trade on a deep exchange order book — or an on-chain swap through an aggregator where the routing is visible and the slippage is yours to set — will normally cost you a fraction of that. What you are really buying from an instant exchanger is the ability to swap without an account, and that convenience is priced at roughly one to two percent. Sometimes that is a fair trade. It is never a free one, and the entire category is marketed as though it were.
What changed since last time
- 2026-07-14Category rebuilt from scratch on measured quotes.The previous version of this page scored these services on a soft rubric with no measurement behind it. It has been replaced entirely.
- 2026-07-14Godex re-measured on a floating rate rather than its default fixed rate.A fixed rate legitimately costs more. Our first run compared its fixed quote to everyone else's floating quote, which overstated its markup by roughly 0.2 points. Corrected before publication.
Questions
If the commission is 0%, how do these services make money?+
On the spread. They quote you a rate that is worse than the rate the market is actually trading at, and they keep the difference. The commission really is zero — the fee line in Godex's own API response literally reads "0" — and it is also irrelevant, because the price is buried in the exchange rate rather than added on top of it. We measured that gap directly: it ran from about 0.5% to about 2.3%, depending on the service, the pair and the size.
Which instant exchanger is actually cheapest?+
Of the four that would answer us without an API key, ChangeNOW was the most consistent at roughly 1.07% below mid-market on average, and Exolix was the cheapest on the stablecoin pair we tested — down to 0.51% on a $500 USDT to BTC swap. Godex was the most expensive by a wide margin at around 1.89%, which is notable mainly because Godex is the one whose page title says "Lowest Fees".
These services say "no KYC". Is that true?+
Not in the way it is heard. You are not asked for identity documents to open an account, because there is no account. You can be asked for them after you have already sent your coins. Exolix states in writing that it may "suspend, delay, reject or cancel transactions" at its sole discretion and "without any prior notice", and then require a government ID, a liveness selfie, proof of address and documents showing your source of wealth. Godex advertises "No KYC" in its page title while operating a written Customer Identification Program. The pattern across this whole category is the same: you are not asked for ID to get in. You are asked for ID to get your money back.
Why are some services missing from the ranking?+
Because we could not measure them, and we would rather publish the closed door than pretend it is not there. Three simply need a free partner key and will be added next run. Two — Changelly and ChangeHero — block scripted requests at the network edge and also require cryptographically signed requests, which means no independent party can price them without their cooperation. One has no working public rate endpoint at all. Every one of them is listed below with the reason.
Is a fixed rate worse than a floating rate?+
No — it is a different product, and a legitimately more expensive one, because you are buying certainty about what you will receive. This mattered to our own numbers: Godex's endpoint returns a fixed rate by default, and our first measurement compared its fixed quote to everyone else's floating quote, which overstated its markup by about 0.2 percentage points. We re-ran the whole thing asking Godex for a floating rate. It is still last, and now the comparison is fair.
How this is funded
It is not. There are no affiliate links on this page or anywhere on this site, no paid placements, and no sponsored positions. Nobody in this table can buy a place in it, accelerate their inclusion, or influence a score — and none of them paid us anything, because there is nothing here to buy. The full policy.