What is Banger

Banger is a code-first strategy automation runtime for prediction markets. You write a Python class describing a strategy. We resolve the universe, subscribe to live ticks, fan out events to your handler, gate orders against a declarative risk envelope, and simulate fills against current books. Live venue execution is a separate, disabled release track.

Built for the strategist running twenty small ones — not the trader with one big bet.

The 30-second model

from decimal import Decimal
from banger import Strategy, signals
from banger.venues.polymarket import Polymarket
from banger.risk import RiskEnvelope


class MyStrategy(Strategy):
    name = "my_strategy"
    venues = [Polymarket()]
    universe = signals.polymarket_markets(
        time_to_resolution_lt="7d",
        min_volume_usd=10_000,
    )
    risk = RiskEnvelope(
        max_position_usd=Decimal("100"),
        max_open_positions=10,
    )

    fade_threshold: float = 0.92

    async def on_market_tick(self, market, tick, ctx):
        if tick.yes_price is None: return
        if float(tick.yes_price) >= self.fade_threshold:
            await ctx.place(self.venues[0], market, side="no", size=Decimal("25"))

$ banger deploy my_strategy.py --paper

That’s it. From there your strategy runs against live data. Watch P&L, fills, and logs on the dashboard. The public beta does not accept live deployments.

Where to next

• Quickstart — install, ship, see your first paper fill in 5 minutes.
• Strategy interface — the full API your subclass implements.
• Venue adapters — Polymarket and Kalshi setup.
• Historical backtesting — coming soon; use in-memory/synthetic ticks for developer tests today.
• MCP server — let Claude/Cursor inspect your strategies.

What Banger isn’t

• Not a broker. We never custody your assets. You paper mode needs no venue API keys. Future live credentials are stored encrypted in the control plane and never exposed to strategy code.
• Not a black-box AI.Strategies are real Python you wrote. We don’t hide the code behind a fund.
• Not a venue. Paper mode consumes venue market data; future live execution will route to supported venues.