Take stock of your crypto years.
What your trades actually produced: fees included, swaps included, compared with doing nothing. Established from your export alone.
Your file never leaves your browser.
You're navigating by dead reckoning.
Your platform shows a balance. Nobody tells you what years of trades produced, or what they cost.
Your fees are added up nowhere
Each line is negligible. The sum is not, and nobody does it.
Your swaps appear on no statement
SOL for ETH: no euro moves, yet you just closed one position and opened another.
No benchmark
A result with nothing to compare it to isn't a result, it's a number. What would you have had by doing nothing?
A written report, then 45 minutes to challenge it.
Four core measures across your whole history. When your file doesn't allow a measure, the report says so, in the exact wording published in advance.
- 01Net performance, after fees actually paid
- 02Cumulative cost of fees, swaps included
- 03Comparison with “doing nothing”
- 04Concentration: what your 3 best trades weigh
Free first, in your browser. Then complete, with us.
The Mirror
Free · 2 minUpload your export. The Mirror tells you what your file allows us to measure, what it rules out, and what the report will say. Nothing is sent: your Network tab stays empty.
- → No account, no email
- → A diagnosis, not a report: no figure on your results
The audit
€400 · paid afterwardsWe measure your entire history by the published method, then walk you through the report on a 45-minute video call. You pay after seeing and discussing it.
- → Free review of your file before any quote
- → If the 4 core measures can't be produced, nothing is billed
The price of a complete, independent reckoning you keep.
A second opinion with nothing else to sell you. A document you can return to in a year, or show an adviser or an accountant. And you only pay after seeing it.
in swap costs, across 261 crypto-to-crypto exchanges. An amount no statement shows.
Three waypoints. You pay at the last one.
The Mirror, in your browser
In two minutes you know what your file allows. Nothing is sent.
Free, before any quote
You send us your file. We answer: measurable or not, and why.
The report, 45 minutes, then you pay
€400, after the debrief. Your file is deleted within thirty days.
What people ask before uploading a file.
The full method, measure by measure, is published on the format page.
How is this different from a tax tool?
A tax tool works out what you owe the state. We work out what your method cost you. They are not the same figures, and the second appears on no tax return.
What if my export is incomplete?
That's the most common case. The Mirror tells you what's missing and how to fix it, usually by re-exporting. A partly readable file yields a partial report, never a silent failure.
What happens to my file?
It is deleted within thirty days of the debrief. The report and the measurement parameters are kept, because a figure that can't be redone can't be challenged. Your file is shared with no one.
Will you tell me what to do next?
No. We measure what happened. That's a structural separation, not a cautious phrase, and it holds during the debrief too.
Why pay afterwards?
Because a third party who asks you to take their word before showing their work is asking for exactly the blind trust this audit exists to replace.
Who measures?
One person, by a method published before the sale, which you can challenge line by line. The first history measured is their own.
€400, paid after the debrief.
Start with the Mirror: free, no account, your file never leaves your browser.
Upload my history — free, no accountTrading involves a risk of capital loss. Sextant gives no investment advice. €400 incl. tax; VAT not applicable, art. 293 B CGI.