Market-maker fast path

trade.marketOpen reads prices, capacity and approvals before it sends. A quoting loop already knows those, so the fast path skips them.

await zeus.build.warm()

const built = zeus.build.marketOpen({
  market: 'ETH/USD',
  side: 'short',
  collateral: 200,
  payToken: 'USDC',
  size: 2000,
  referencePrice: myMidPrice,
  slippage: 0.2
})

const { hash, requestKey } = await zeus.send(built)
const receipt = await zeus.track(requestKey)

warm() caches the market list, the execution fee and the wallet’s next request indexes. After it, build.* makes no network call at all.
built is { to, data, value, requestKey, kind }, ready for any signer. The request key is known before sending.
referencePrice is the price the slippage limit is taken from, usually your own feed.
The fast path pays in the collateral token: the market’s token or ETH for a Long, USDC for a Short. Use trade.marketOpen when a swap is needed.
Each build advances the predicted request index, and a failed send gives it back. If you build a request and never send it, or send out of order, call warm() again; track asks for it by itself when a receipt shows another key.
track follows a request sent with send, or any request when you pass { submitTx }.

build.marketClose works the same way for closes.

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Market-maker fast path