Mirror a better traderin 0.7 s, from 3 bp.

No. The agent key you approve is a Hyperliquid API wallet — the exchange itself refuses withdrawal and transfer instructions signed by it. We hold that key for you: it is generated on our side, kept encrypted, and only ever handed to the engine that trades your account. So MirrorTrade can make your account trade. It cannot make your account pay us, and it cannot move a dollar off Hyperliquid.

Your approval expires and copying stops. Hyperliquid puts a hard 90-day life on every agent approval — the exchange's rule, not ours, and not documented anywhere public. When it lapses there is no error and no message from the exchange; the copying simply stops. We track the expiry date on every account and warn you 14 days out. Re-signing takes one signature from your own wallet.

Your open positions stay exactly as they are — they're yours, on the exchange, not held by us. Nothing new is copied until we're back. The trader's fills from that window show in your record as not reproduced, and we don't invent a tidy reason for them: they go in the same bucket as anything else we can't account for.

Every fill we don't reproduce is labelled, and the label comes from the engine's own log rather than from a guess. The common one is size: your scaled share landed under Hyperliquid's $10 minimum order. There is also a bucket we keep deliberately separate — unexplained: no order from us, and no log line saying why. We would rather show you an unexplained row than fold it into a reason that reads well.

Close, not identical. You're a few hundred milliseconds behind, so you'll fill a fraction better or worse depending on which way the market moved in between. It cuts both ways, and on a violent candle it can be far worse than the fee. We don't publish an average slippage figure, because we haven't measured one yet — when we have, it will be on this page with its conditions next to it.

On 3 August 2026, on one account, on one machine with no other customers on it. That is the engine with room to breathe — not a floor it holds under load. Latency is the first thing multi-tenancy costs, so this figure is a measurement, not a service level, and we re-measure on a full box before it ever becomes one. If you see us quote a competitor's latency, ask us who timed it: nobody here has.

Three dollars per $10,000 of notional MirrorTrade trades on your behalf — charged on the trade, not on your balance and not on your profit. A $5,000 account turning over its size twice a week pays about $12 a month. Hyperliquid's own taker fee is 4.5 bps on that same fill; it goes to the exchange, and we never mark it up.

One account follows one trader. To follow a second, you open a second account — its own share of your balance, its own agent key, its own settings. We don't net positions across accounts: if two of them take opposite sides of the same market, both pay their own way in and out.