How RXN works

Turn on

A step in the ticket. Your wallet approves the key on Hyperliquid for 1, 3 or 7 days: 1 unless you pick more.

Turn off

“Turn off trading” in your account menu. One wallet signature, and Hyperliquid drops the key at once.

Runs out

The key stops by itself when its days end. RXN warns an hour before.

Another browser

Turning trading on elsewhere replaces the key here: an account has one RXN key at a time.

The key is made in your browser and sealed there under a key the browser can't export. It never leaves the browser, and RXN has no copy on a server. Your wallet approves it on Hyperliquid under the name “RXN”. Only the main window signs with it, one signature at a time.

Turning it off closes nothing: positions and orders stay on Hyperliquid, where you can manage them with your wallet. A Guard already placed stays too, but stops following your margin until trading is on again.

TWAP

Hyperliquid's TWAP action has no field for a builder.

Trailing stop

Hyperliquid's trailing stop has no field for a builder either.

Your own liquidation

Hyperliquid's liquidation order carries no builder.

“Sell for USDC” after a deposit

RXN takes nothing. Hyperliquid's spot fee applies.

Fee not approved

Without your approved ceiling, orders go with no RXN fee. They are never refused for it.

Builder not paid

Hyperliquid pays a builder only with 100 USDC in its perps account and in standard account mode. Otherwise orders go with no RXN fee.

A way out refused for the fee

A close, TP, SL, Guard or Panic goes once more without it.

“All-in” walks the live order book level by level for your size: the average fill, its distance from the mid, Hyperliquid's fee at your rate and RXN's fee. A limit that rests counts no slippage and the maker fee. Where the 20 levels Hyperliquid shows can't fill the size, the ticket says “book too thin” rather than guess.

2 bps is 0.02%, 0.5 bps is 0.005%. Your wallet approves a ceiling of 5 bps once, and Hyperliquid never takes more than you approved. Each order then carries the rate for its market.

Hyperliquid takes a builder fee per order, not per fill. A resting limit order pays RXN's fee even when it fills as a maker, and only a post-only order you place is sure to pay none. It still names RXN's builder, at 0, so the volume counts as RXN's. Close, TP, SL and Guard fills pay the market's rate.

A chase or a scale pays 1 bp (0.01%) on each post-only order it rests, or the market's own rate where that is lower: 0.5 bps on a HIP-3 market in growth mode. What a chase takes at the market at its end pays the market's rate. A trailing stop carries no builder: Hyperliquid's action has no field for one.

Growth mode is set per market by its HIP-3 deployer, and RXN reads it from Hyperliquid's market data. Hyperliquid's own base rates on perps are 0.045% taker and 0.015% maker, lower with volume. On a HIP-3 market the fee is the market's own: its deployer's share on top, a tenth of it in growth mode.

What it is

A stop-market of Hyperliquid's own that only reduces, for the whole position.

Page closed

It stays on Hyperliquid and still fires.

When it moves

When margin, leverage or size change, while RXN is open in this browser with trading on. Changed elsewhere, it moves the next time RXN is open.

A gap

It fills at the market, and a gap past both prices can reach liquidation first. It is protection, not a guarantee.

When it fires

History marks the close “Closed by Guard” with its price and result. With the page open, RXN says so at once, and on your device too when notifications are on.

It closes the position early so what is left of the margin stays yours. Your own stop-loss can stand beside it. Hyperliquid takes it off with the position.

If the price is already inside its room, it can't be placed: add margin or close. A position with no liquidation price has nothing to guard. RXN's fee on its fill is the one on a close.

Crypto

BTC, ETH, SOL, ZEC, AVAX, XPL, MON and tokens on Solana and Base, sent to your own Unit address. It arrives on your spot balance, and “Sell for USDC” turns it into USDC in one tap.

Arbitrum

USDC from your connected wallet through Hyperliquid's own bridge. Minimum 5 USDC, about a minute, network fee in ETH.

Exchange

USDC withdrawn straight to your address on the Hyperliquid network. If your exchange lacks it, use your Unit address.

Crypto. Unit, Hyperliquid's asset layer: its guardians hold it, and 2 of 3 must sign. RXN shows your address only once they have signed it. Send only that coin on that network, above the minimum the window shows. Unit takes no fee of its own, and network fees come out of the deposit. Tokens: PUMP, FARTCOIN, SPX, BONK, 2Z, ANSEM on Solana, VIRTUAL on Base.

Arbitrum. Hyperliquid's bridge holds it, run by Hyperliquid's validators. It credits the address that sent the money, so under 5 USDC is lost and RXN never sends less.

Exchange. Nobody else holds it on the way. Pick the network named Hyperliquid (HyperCore), not HyperEVM. Never withdraw from an exchange to the bridge contract: the bridge would credit the exchange.

Withdrawing. RXN has no withdrawal. You withdraw on Hyperliquid with your wallet.

Loss limit

The most it may lose from when you sign: fees, funding, and what each position would lose at its stop. A win after a loss refills nothing.

Size

What it holds stays within 20× the loss limit, however tight its stops: $50 of loss, $1,000 of positions.

Leverage and markets

The highest leverage and the markets it may trade, never above a market's own maximum.

Time

Up to 30 days. Then you sign again.

RXN's server runs on your own computer, next to your agent, and speaks MCP. It is in early access: the one-line setup opens here with its listing.

Claude Code. Add it as an MCP server.

Claude Desktop. Settings, then Developer, then Edit config: add RXN under “mcpServers” and restart.

Your own bot. Any MCP client, over stdio or HTTP on your computer. Every answer is JSON.

Then ask in plain words: “Which markets pay the most funding to shorts?” or “I'll risk $30 on a BTC long with a stop at 104,500. What size?”

1. A key for the agent. Approve one on Hyperliquid's API page: the agent's own key, not the RXN key in your browser. It trades and can never withdraw.

2. RXN's fee. Turn trading on once in the terminal: your wallet approves RXN's fee, and every order the agent opens carries it.

3. Your limits. The server opens a page on your computer where your wallet signs them. It moves no money.

4. Start it with trading on, the agent's key and the signed limits. The key stays on your computer.

Each trade is two steps: a preview with the size, both fees, the liquidation price and what it risks, then the send. The answer is Hyperliquid's own receipt.

It never withdraws or transfers: Hyperliquid refuses that from an agent key. It never leaves an order resting to open later: it opens at the market, and its limits and stops only reduce. It can't turn the Guard off: the Guard rides on every position it opens.

A way out always goes: closing, cancelling an order that would open, and a nearer stop, whatever is left of the limit. A price that gaps past a stop can still lose more than the limit; the size cap bounds how much. RXN can pause new agent trades at any time, and closing still works.

Points come from Hyperliquid's public data on RXN's builder fees, scored once a week. Volume alone counts for nothing; trades against yourself, another RXN wallet or a thin market get none. Points have no cash value. Rules may change.

Weekly PnL. The week's closed PnL of your whole perp account over the money in it — its value on Monday plus the most that came in — and never more than the account's own PnL that week. Ranked from $1,000 in the account, $25,000 traded on RXN and 5 closing fills on 2 days, with most of your volume on RXN and leverage at each of your fills never over 20×.

Quality. Sortino of your daily returns over two or more weeks you traded on RXN this season, with leverage at each of your fills never over 10× and no drawdown over 25%. Past results, not a promise.

You pick a word for your link, rxn.gg/r/yourword, and claim it with a signature from the wallet you'll be paid to. A trader joins by opening your link and confirming once in their wallet: a signature, no transaction. The first link they came with counts for 30 days and never changes after their first trade.

Only new traders count. Your own wallets don't: not your link's wallet, not wallets that trade with each other or send each other money on Hyperliquid, not wallets that invite each other. Your traders pay the same fees as everyone.

Shares are worked out each week from Hyperliquid's daily record of RXN's fees (its daily builder files; only fees there count — the files stop around 12:10 UTC, so later trades are not counted) and paid in USDC to your link's wallet once you're owed $10; less rolls over. Each payment is sent by hand with a statement. Your page opens with a signature and shows your link's clicks, joins and totals — to you only, never a trader's address. Rules may change.