Your wallet shows you what you hold. It has never once shown you what you paid for it. Tare reads your whole history on this chain — the shares that arrived, and the dollars that left in the same transaction — and works out the cost of every lot, what it is worth now, and what you are up or down. Then it sells the ones you choose in one transaction.
Tare is a page, not a company. It reads the chain from your browser and sends nothing but what you choose, from your own wallet.
Paste any address. Tare asks Robinhood Chain for every transfer of a tokenized stock with that address on either side — and, in the same queries, every dollar and every wrapped ether that moved with them — starting at block 140,000, where the first of these stocks ever moved. That is the whole history, not a guess from a balance.
In the transaction where the shares arrived, something left: USDG, ETH, or other shares. That is what they cost. Where nothing left — a gift, a transfer from your own other wallet, liquidity coming back — Tare values them at the chain's own price in that block and marks the lot received.
Tick the stocks you want gone — or tap Down to tick everything you are losing on. Tare quotes every leg on the better of Uniswap v3 and v4, tells you the gain or loss it books before you sign, and sends one transaction to Uniswap's Universal Router.
A cost basis is a judgement as much as a number. Here is the whole judgement Tare makes, in the order it makes it.
| Block 65,642,498 | bought 2.00 shares | $600 left the wallet |
| Block 65,643,498 | bought 1.00 more | $400 left the wallet |
| Block 65,644,398 | sold 2.00 | $800 arrived |
| first in, first out: those two cost $600 | +$200 realised | |
| one share left, at the second lot's price | $400 of cost |
The same arithmetic runs in js/ledger.js, which is the file the page loads, the property run executes and the fuzzer attacks. There is no second copy of it anywhere on this site.
The first 25 addresses, in a fixed order nobody chose, of the 775 stock holders on this chain. Whole histories, through the same two files the page runs.
A lot is exact when the chain shows dollars leaving the wallet in the same transaction as the shares arriving. Everything else is valued, and says so on the row.
Reading a wallet is a few log queries, not one per transaction: an earlier version fetched a receipt for every transaction and took over ten minutes on the busiest address here.
Every number here comes from one chain, and the chain does not know everything about your money. These are the gaps, in the order they are likely to matter to you.
If you bought shares somewhere else and sent them here, the chain has no idea what you paid. Tare marks that lot received and values it at the price when it arrived — which is a different number from your cost, and the page never pretends otherwise. In the wallets we read, 93% of lots were like that.
The fee you paid to make each trade is not in the cost. Neither are wash-sale rules, holding periods, or anything your own tax authority does differently — including whether these tokens are securities where you live. Tare is a ledger of what the chain shows. It is not advice, and nobody here is your accountant.
Shares put into a Uniswap position leave your wallet and come back as a different amount. Tare books them as sent and received, so the cost survives but the gain from providing liquidity does not appear. Where the lots no longer add up to the balance the chain reports, the row says so rather than showing a cost that cannot be right.
Tare holds nothing and deploys nothing. Selling is Uniswap's own Permit2 and Universal Router, called by your wallet.
Before you sign, Tare tells you what the sale realises against the cost of the lots it will consume — first in, first out, the same lots the table shows. A loss you have been carrying becomes a loss you have taken, and the page says so in those words.
Each figure below is written by the tool that produced it, into data/, and the build refuses to publish a page with a number nobody computed.
Tare has not been audited. It deploys no contract of its own, so there is nothing of ours to audit — but the page could still be wrong about your money, and the checks above are the reason to believe it is not, in the ways they cover.
No. It never asks for an approval of its own, and it has no contract to hold anything in. The only approval it ever asks for is to Uniswap's Permit2, for the exact number of shares in the sale you chose, and the dollars go from the pool straight to your address.
Tare prices 51 stocks — the ones with a real Uniswap pool against USDG on this chain at block 65,570,610. A token with no pool has no price, so it cannot be valued or sold, and it is left out rather than shown at zero.
Most likely one of three things: a lot that arrived from somewhere the chain cannot price (the row says received), gas that Tare does not count as cost, or shares that went into a liquidity position and came back. If the lots do not add up to your balance, the row says that too.
No account, no server of ours that sees your address, no analytics. The one thing that is not your browser is a small proxy for reading the chain, which exists because Robinhood's public node rejects a browser exactly when it is busy.
Because the alternative is choosing, and a ledger that chooses gets to decide whether you made money. FIFO is what most tax authorities assume by default. Tare states the method on the page and in every export.
It is one page on a static host, with no company behind it. The photograph, the licence and the credits are on the credits page; what it can and cannot see is spelled out in the docs.
Any address, no wallet needed to look.