Here is my review.
Here, I will not deal too much with praise and explaining functional things, but only with what I think requires change or improvement.
User experience and understanding designTo begin with, there is no need for generic texts on the site. It's okay to be new to the business, and no one expects an exchange to make millions of transactions from day one.
This is obviously not true, and spreading wrong information can only have a negative effect.

Also, this testimonials part is quite unnecessary, and at the same time inaccurate. "
Excellent since 2024" and at the same time, it is very easy to check that the domain was registered on 2025-04-25, so the whole thing seems quite naive and automatically discredits the other reviews written on the site (I don't go into whether they actually happened).
https://whois.domaintools.com/changeum.ioI see that in the FAQ section, you also insist on the year 2024. I assume that the business idea was born that year, but I would definitely talk about the operational period in that term
- You can add a blog post somewhere, where you will present your journey from the beginning of the creation of the Changeum exchange.
The FAQ with the index page definitely needs to be seriously reconstructed. Q: Why should I trust Changeum? does not inspire much confidence. All links lead to empty pages. Non-existent page on Trustpilot, Bestchange, X account that does not exist, private FB and Insta pages..

One more incorrect info on the home page;
Thousands of supported coins and tokens
??
Only 20 listed coins, and from what I see on the about page, it says 20+.
Star's animation is not the best optimized for different screen sizes, so something like this happens. It won't be a big waste to throw this out.
Even on regular resolution, I have a horizontal scroll bar.

If you already comply with the GDPR rules, you should also have the "reject" option for the cookie

ExchangeI just registered an account, and now I see that the order I created on September 16th has been saved, recognized, and added to my transaction history. After how long are cookies deleted?
- For unregistered users, the 'delete order' option would probably be preferable.
Why is the maximum amount per transaction 4x lower for the fixed rate?

You can show exactly how much the service fee is for a float/fixed rate, instead of the user having to ask for it on the website. It is more transparent. The "info" hint only explains the difference between these two models.
With regard to your AML policy, to refund coins that do not pass your analysis, it is unclear how you do it. Is the refund made automatically to the address from which the coins were sent (can cause problems if coins are sent from another exchange or any third-party service, where the user has no control over the PK), or is the address requested afterwards? The latter could be misused as mixing or a kind of coin laundering.
This is part of the AML policy, and I think it should be more clearly defined through the exchange process.
I accidentally closed the Changeum site, what should I do?
You can return to the page through your browser history.
For example, the browser can be set to delete all cookies and history after a restart. TOR users.
Instead of this, I would add a page where the user can enter the order ID and check the status of the order at any time.
Next to this, I would ne neccessary to add a check box with which the user will have to confirm that he has saved all the necessary information (order ID).
On the exchange widget, it is a good thing that we have expressed how much we send and how much we receive, but the amount is in USD. Given that all pairs are crypto to crypto, it would be very useful to have such information, the rate at which the swap is performed.
You should clearly write in your FAQ whether you operate with your own liquidity funds or through a third party. A very important thing for the KYC policy.
The affiliate program could be supplemented with ready-made solutions such as swap widgets with aff code, which partners could easily implement
SupportI contacted support. It took about 5-6 minutes to get the first answer, and after that, the support agent was dedicated to communication. I got answers relatively quickly.
5-6 minutes is not too long. However, it might not be bad to receive at least some automated message about the waiting time immediately after opening the chat.
Swap processThe swap widget should contain a counter for refreshing the exchange rate or possibly a refresh button. (Both options are best.) I noticed that the exchange rate is refreshing, but not in what period.
You should think about implementing the RBF (replace by fee) function. to keep the order automated. In the conversation with support, they confirmed that in that case, it is necessary to contact you, and the order will be processed manually.
I created an order 0.0005 BTC>ETH
I don't have too many complaints about the process itself, everything is quite clear, and the order was completed in less than 20 minutes. The slowest part was waiting for the Bitcoin transaction I sent to be confirmed.
Regarding the floating rate, it’s challenging to determine if the exchange rate changed during the process, which inevitably takes some time due to network confirmations.
However, there seem to be slight discrepancies between what was offered and what I ended up getting.
So, for example;
Received amount is 0.013663945655847

The moment the swap was completed and I received ETH to my address, I created a new identical order and according to it, the amount I was supposed to receive was 0.0137141

It doesn't have to be an important thing, in the end, I exchanged a small amount ($54). It should probably be tested on a larger amount to determine whether it is a percentage or just network dust created during transactions.
If an additional network fee applies to the transaction based on the user's deposit address, this should be clearly highlighted. Ideally, the fee should be charged upfront before the swap order begins.
I analyzed the coins (used freshly generated, and never used before, the ETH address) I received from this swap, and the result is a fairly satisfactory low-risk score.

The final conclusion is quite positive. Personally, I prefer this concept of instant exchangers.
A few cosmetic upgrades would improve the overall impression, but I assume that this review campaign was started because of that.