Hyperliquid order checker API (pre-trade). Pre-trade check of a Hyperliquid perp order before you send it: REJECT_LIKELY / CAUTION / OK, each exchange-rule issue with a fix value (size decimals, price tick, $10 minimum, max leverage by margin tier, isolated-only, OI cap, delisted, far-from-mark limit), warnings and the coin rules. Read-only; never places or signs orders. Fail-closed: a failed source is listed, never OK. Not financial advice; the exchange decides whether an order is accepted.

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