Documentation for Deptle Terminal.

Use Parameter(...) for inputs you want to tune in the Optimizer.

• Required keyword keys: default, min, max.
• Optional keys: step (default 1), name (UI label).
• Validation: min <= default <= max, step > 0.

1class ParamExample(Strategy):
2    fast: int = Parameter(default=20, min=2, max=200, step=1, name="Fast Window")
3    slow: int = Parameter(default=100, min=10, max=500, step=5)
4
5    def on_tick(self, tick):
6        return Order.Hold()

Use scalar state when you want one value to survive from one event to the next.

• x: int = State(default=0).
• y: float = State(default=0.0) or State(default_f32=0.0).
• Assignments are type-checked; float state accepts numeric expressions via cast.

Use array state for rolling buffers and indexed memory that should persist between events.

• arr: list[int] = State(size=64, default=0).
• arr_f: list[float] = State(size=my_param, default=0.0).
• size must be a positive int literal or parameter name.
• Indexing supports negative offsets and saturates out-of-range indexes to nearest valid element.

1class ArrayState(Strategy):
2    n: int = Parameter(default=16, min=4, max=128)
3    buf: list[int] = State(size=n, default=0)
4    idx: int = State(default=0)
5
6    def on_tick(self, tick):
7        self.buf[self.idx] = tick.price
8        self.idx = (self.idx + 1) % self.n
9        return Order.Hold()

Use Extra(...) when you want to read outside data without modifying it from strategy code.

• Supported types: list[int] and list[float].
• Binding must be >= 2 (0/1 reserved).
• Use len(self.extra_name) and self.extra_name[i] for reads.
• Writes are forbidden (compile error).

Declare the asset layout up front when your strategy expects more than one market stream.

• required_assets: int = N where N is in [1, 32].
• asset_slots: list[str] = ["lead", "hedge", ...] with 1..32 entries.
• If both are present, required_assets must equal len(asset_slots).