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Whalefax
The tax report Kalshi and Polymarket never send you
Kalshi, Polymarket and Robinhood do not send a 1099 for event contract trades, so the record you file in April is yours to build. Whalefax turns any of their exports into real P&L and per-position tax detail, with FIFO lot matching and fees in the right place. It also rebuilds any public Polymarket wallet, including the losing positions that leave no trace on chain. Free, no account, and it runs entirely in your browser so your trades are never uploaded.
Top comment
Hi all. I built this because prediction markets got huge this year and nobody sends you a tax form for any of it. Kalshi gives you a CSV of individual fills, Robinhood gives you a statement that says on it that it is not a tax form, and Polymarket gives you nothing whatsoever. In April every one of those becomes your problem. The part that surprised me most was Polymarket. When a position wins you redeem it, because each share pays a dollar, and that redemption is written to the chain. When a position loses, redeeming pays nothing and still costs gas, so essentially nobody does it and the loss leaves no record at all. Every leaderboard and tracker built on settlement data is therefore counting wins far more reliably than losses. I have rebuilt twelve wallets from the top of the weekly profit board to see how big the gap gets. Their real win rates land between 44 and 74 percent, so this is not a story about everyone secretly being average. Some of them are genuinely good. What has not varied once is the direction. All twelve profiles read higher than the rebuilt record, by anywhere from 12 points to 52. One profile shows 200 wins against 1 loss for a trader who is really 200 and 222. Another shows 33 wins and no losses at all, for a trader who is 33 and 23. So a published win rate is a ceiling rather than a measurement, and from outside you cannot tell whether a given one is off by twelve points or by fifty. They are all genuinely up a lot of money. For most of them the edge is position sizing rather than accuracy, which is a much harder thing to copy than a win rate. It is free and it has no account because there is no server to hold anything: parsing, lot matching and export all happen in the page. You can watch the network tab while you import. Two things I would ask. If you trade these markets, tell me where it gets your numbers wrong, because it has been tested against files I wrote far more than against real ones. And if you know how any of this should actually be filed, I would love to hear it, because the classification of event contracts is genuinely unsettled and I have been careful not to pretend otherwise anywhere on the site.
About Whalefax on Product Hunt
“The tax report Kalshi and Polymarket never send you”
Whalefax was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #108 on the daily leaderboard. Kalshi, Polymarket and Robinhood do not send a 1099 for event contract trades, so the record you file in April is yours to build. Whalefax turns any of their exports into real P&L and per-position tax detail, with FIFO lot matching and fees in the right place. It also rebuilds any public Polymarket wallet, including the losing positions that leave no trace on chain. Free, no account, and it runs entirely in your browser so your trades are never uploaded.
On the analytics side, Whalefax competes within Analytics, Crypto and Finance — topics that collectively have 219.2k followers on Product Hunt. The dashboard above tracks how Whalefax performed against the three products that launched closest to it on the same day.
Who hunted Whalefax?
Whalefax was hunted by whalefax. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Whalefax including community comment highlights and product details, visit the product overview.