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Exchange.market_open (HL-compat)

Place a market order with a slippage cap. px is silently ignored.

Signature

def market_open(
    self,
    name: str,
    is_buy: bool,
    sz: float,
    *,
    px: float | None = None,
    slippage: float = DEFAULT_SLIPPAGE,
    cloid: Cloid | None = None,
    builder: Any = None,
) -> dict[str, Any]

Example

from dango.hyperliquid_compatibility.exchange import Exchange
 
ex = Exchange(wallet, base_url="...", account_address="0x...")
ex.market_open("ETH", is_buy=True, sz=0.5, slippage=0.01)

Parameters

name — str. HL coin name.

is_buy — bool.

sz — float. Always positive on the HL side.

px — float | None, optional. Accepted-and-ignored. Dango computes its own slippage band against the contract's mark price.

slippage — float, optional. Default: DEFAULT_SLIPPAGE = 0.05 (matches HL).

cloid — Cloid | None, optional. Raises NotImplementedError if non-None — Dango's submit_market_order does not accept a client_order_id. Use a limit order with tif="Ioc" if you need cloid binding for a market-equivalent.

builder — Any, optional. Non-None raises NotImplementedError.

Returns

dict[str, Any] — HL status envelope with response.type="order".

Notes

  • This is the most common surprise during migration. See Migration for the rationale.

See also