> For the complete documentation index, see [llms.txt](https://futuresdoc.gitbook.io/help-center/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://futuresdoc.gitbook.io/help-center/perpetual/untitled.md).

# USDT margined perpetual contract

- [USDT Perpetual Contract Introduction](https://futuresdoc.gitbook.io/help-center/perpetual/untitled/usdt-perpetual-contract-introduction.md)
- [Leverage and position limit](https://futuresdoc.gitbook.io/help-center/perpetual/untitled/leverage-and-position-limit.md)
- [Ladder Maintenance Margin Rate](https://futuresdoc.gitbook.io/help-center/perpetual/untitled/ladder-maintenance-margin-rate.md)
- [Margin and profit/loss calculations](https://futuresdoc.gitbook.io/help-center/perpetual/untitled/margin-and-profit-loss-calculations.md)