Your whole available account balance backs this contract, and profits and losses of different positions offset each other. In extreme moves your whole balance can be liquidated together.

Each position uses its own margin. The maximum loss is limited to that margin and does not affect other positions or your balance. You can add or remove margin manually.

Buy or sell at your price or better. The order waits in the book until it fills or you cancel it.

Fills immediately at the best available price. Fast, but the fill price may slip in volatile markets.

When the mark price reaches your trigger price, a market order is placed automatically.