Crate lfest

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§Leveraged Futures Exchange for Simulated Trading (LFEST)

:radioactive: This is a personal project, use a your own risk.

lfest-rs is a simulated perpetual futures exchange capable of leveraged positions.
You fed it external market data through the MarketUpdate enum to update the MarketState. Where you either provide bid and ask price or information derived from a candle.
Macros (bba, candle) make it easy to construct the concrete variant.
For simplicity’s sake (and performance) the exchange does not use an order book.
The exchange can be configured using Config and ContractSpecification


  • :currency_exchange: Fixed point arithmetic using fpdec crate, for super fast and precise numeric calculations.
  • :brain: Use of newtype pattern to enforce the correct types at function boundaries.
    Examples include:
    This makes it impossible to mistakenly input for example a USD denoted value into a function that expects a BTC denoted value.
  • :satellite: Flexible market data integration through the MarketUpdate type and associated macros.
  • :chart: Integrated performance tracking.
    Use the existing FullAccountTracker
    or implement your own using the AccountTracker trait.
  • :heavy_check_mark: good test coverage and heavy use of assertions, to get to ensure correctness.
  • :mag: Auditable due to its small and consice codebase.
  • :page_with_curl: Supports both linear and inverse futures contracts.
  • :no_entry: Order filtering to make sure the price and quantity follow certain rules. See:
  • IsolatedMarginRiskEngine
  • Double-Entry Bookkeeping is used to ensure the accounting-equation always holds.

§Order Types

The supported order types are:

  • Market: aggressively execute against the best bid / ask
  • Limit: passively place an order into the orderbook

§Performance Metrics:

The following performance metrics are available when using the FullTrack AccountTracker,
but you may define any performance metric by implementing the AccountTracker trait.

  • win_ratio: wins / total_trades
  • profit_loss_ratio: avg_win_amnt / avg_loss_amnt
  • total_rpnl: Total realized profit and loss
  • sharpe: The annualized sharpe ratio
  • sortino: The annualized sortino ratio
  • cumulative fees: Sum total of fees payed to the exchange
  • max_drawdown_wallet_balance: Maximum fraction the wallet balance has decreased from its high.
  • max_drawdown_total: Drawdown including unrealized profit and loss
  • max_drawdown_duration: The duration of the longest drawdown
  • num_trades: The total number of trades executed
  • turnover: The total quantity executed
  • trade_percentage: trades / total_trade_opportunities
  • buy_ratio: buys / total_trades
  • limit_order_fill_ratio
  • limit_order_cancellation_ratio
  • historical_value_at_risk
  • cornish_fisher_value_at_risk
  • d_ratio

There probably are some more metrics that I missed. Some of these metric may behave differently from what you would expect, so make sure to take a look at the code.

§How to use

To use this crate in your project, add the following to your Cargo.toml:

lfest = "*" # or lookup newest version on ``

Then proceed to use it in your code. For an example see examples


  • proper liquidations (see update_state in Exchange)
  • Orderbook support (with MatchingEngine)
  • Funding rate (support settle_funding_period in ClearingHouse)
  • Multiple accounts (low priority)
  • Multiple markets (low priority)
  • Portfolio RiskEngine for multiple markets akin to SPAN
  • Support for updating leverage of a position.
  • Support auto-deleveraging
  • Benchmarking
  • more unit tests.
  • fuzz testing?


Would love to see you use and contribute to this project. Even just adding more tests is welcome.

§Donations :moneybag: :money_with_wings:

I you would like to support the development of this crate, feel free to send over a donation:

Monero (XMR) address:




Copyright (C) 2020 <Mathis Wellmann>

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with this program. If not, see

GNU AGPLv3 lfest - leveraged futures exchange for simulated trading



  • Allows the quick construction of BaseCurrency
  • Creates the Bba struct used as a MarketUpdate.
  • Creates the Candle struct used as a MarketUpdate.
  • Allows the quick construction of Fee
  • Allows the quick construction of Leverage
  • Allows the quick construction of QuoteCurrency
  • Creates the Trade struct used as a MarketUpdate.



  • Constructs a mock exchange (for inverse futures) for testing.
  • Constructs a mock exchange (for linear futures) for testing. The size is denoted in BaseCurrency and the margin currency is QuoteCurency
  • Constructs a mock exchange (for linear futures) for testing. The size is denoted in BaseCurrency and the margin currency is QuoteCurency

Type Aliases§

  • This is defined as a convenience.