A trade that worked, and a balance that disagreed

I made a trade that worked and the number in my account was not the number I expected.

Not close. Not off by fees I had budgeted for. Off by most of it.

I had read the fee page. I had not done the subtraction.

This site is that subtraction, written down.

That is the whole origin. Not a business plan, not a gap in the market. A position that gained, an account balance that disagreed, and a half hour with a calculator trying to find where the difference went.

It turned out to be ordinary: two fills instead of one, funding that ran while I slept, and a rate I had read as the rate I would pay. All of it published. None of it in the order preview.

What this site does

One narrow thing: it publishes exchange costs with the date attached, and shows the arithmetic on a real position size. No rankings, no score out of five, no “best exchange” list.

Every number has a timestamp because the numbers change. Every page that uses a rate says when it was captured. A rate without a date is not information, it is a rumour with decimals.

How the numbers are obtained

From the exchange's own machine-readable API where one exists, and from published fee pages where it does not. When the two disagree, the page says so rather than picking the convenient one. When a field is missing, it is marked missing — not estimated, because an estimate becomes indistinguishable from a measurement once it is published.

The full procedure, including what is deliberately excluded, is on the methodology page.

How this is paid for

A referral link. If you open an account through it, this site may receive a commission from the platform at no additional cost to you. That is disclosed next to every link, and in full on the disclosure page.

Worth being explicit about the incentive: the site earns more if you register. That does not change the API numbers, which come from the platform rather than the affiliate programme, and it does not produce a ranking, because there is no ranking on this site to bias. But you should know it before you weigh anything written here.

What this site is not

1. Not financial advice. Nothing here tells you what to trade or whether to trade.
2. Not affiliated with any exchange. Not endorsed by, operated by, or speaking for Gate.com or MEXC.
3. Not a ranking. There is no order of preference anywhere on this site, and its absence is deliberate.
4. Not complete. Comparisons cover only what could be verified, and say which platforms were excluded and why.

The one arithmetic that started this

A $100,000 perpetual position, closed for a $200 gain. At the taker rate on this site (0.0750%), entering and exiting costs $150.00. One day of funding at the captured rate adds $15.30. Out of a $200 gain, $165.30 is gone before anything else.

Three line items. Two of them I had never looked at before that evening, and both were published the whole time.

Switch both sides to limit orders and the same trade keeps $204.70. Same direction, same exit, $170.00 difference in what the platform keeps. That gap is the subject of this entire site, and it has nothing to do with predicting price.

Who writes this

One person, working from public data, with no newsroom and no analyst team. That is a limitation worth stating plainly: there is no second reader catching an arithmetic error, and no legal review of the wording.

The compensation for it is that every number can be reproduced in a terminal in under a minute. A page here that cannot be checked against its own source is a bug, not an opinion.

Corrections

If a number here disagrees with the exchange's own page, that is worth an email. Include the page, the figure you believe is correct, and a link to the source: yangayxin5025@gmail.com.

This is a one-person publication. Replies are not instant, but every message is read, and corrections change the page rather than being quietly deleted — the update date moves with them.