Cancelling Orders

Canceling an Open/Unmatched Order

Sending an instruction to cancel an open/unmatched (or residual/partially unmatched) order requires identifying the order by it's outcome_id and the order_id.

Other methods exist to cancel orders en masse - for example, cancelling all orders related to a particular outcome or for the whole market.

Market makers or other traders with a large number of orders needing to refresh price frequently might find these functions both faster and cheaper to use.

Python

if uma.user_market_state.number_of_orders > 0:
        
        # As an example, get the first order in the UserMarket account
        my_order = uma.user_market_state.orders[0]
        
        # Send a cancel instruction for this order
        txn_signature = await uma.cancel_order(
            owner = owner_keypair,
            order_id = my_order.order_id,
            outcome_id = my_order.outcome_id,                                
            active_pre_flight_check = True
        )

        # Wait to ensure transaction has been confirmed before moving on
        await client.provider.connection.confirm_transaction(signature['result'], Confirmed) 

Typescript

if (uma.numberOfOrders > 0) {
    const myOrder = uma.orders[0]

    const signature = await uma.cancelOrder(
      ownerKeypair,
      myOrder.orderId,
      myOrder.outcomeId,
      undefined, //Default Send Options will be used
      undefined, //Don't re-try this if it fails
      true
    )

    //Wait to ensure transaction has been confirmed before moving on
    await client.connection.confirmTransaction(signature, "confirmed")
}