Can you trade Polymarket or Kalshi on Composer?

No. Composer is a registered US broker-dealer focused on equities and ETFs, and does not support prediction markets like Polymarket or Kalshi. Banger is built specifically for those venues.

Is Banger a good Composer alternative?

For prediction markets, yes. Banger automates strategies on Polymarket and Kalshi, lets you write real Python or clone a strategy, paper-trades against live market data first, and never holds your funds. Composer remains the stronger choice if your goal is automated equity and ETF investing.

Banger vs Composer

Composer is A no-code platform for building and automating systematic equities and ETF strategies ("symphonies"), operated as a registered broker-dealer. Banger is a strategy-automation runtime for prediction markets. Here is how they compare, and when each one is the right call.

	Banger	Composer
Primary assets	Prediction markets (Polymarket, Kalshi); equities and crypto as expansion adapters	US equities and ETFs
Prediction markets	Native. The wedge, not an afterthought.	None. As a regulated US broker-dealer it cannot host Polymarket or Kalshi flows.
Strategy authoring	Real Python (banger.Strategy) or clone a marketplace strategy and configure it	Visual, no-code symphony builder
Custody	Never. You bring your own venue keys.	Custodial. Composer is your broker and holds the account.

Where Banger is different

Banger is prediction-markets-first. Composer structurally cannot offer Polymarket or Kalshi because it is a regulated equities broker.
Banger never custodies funds. You keep your own venue keys; Composer holds your account.
Banger is code-or-clone: write real Python for full control, or clone a marketplace strategy. Composer is no-code only.
Banger ships a CLI and MCP server, so you can build and run strategies from Cursor or Claude Code, not just a web UI.

When Composer is the better choice

Hands-off investors who want to automate diversified ETF and equity strategies without writing code, inside a single regulated brokerage account.

The verdict

If you want automated ETF investing in a regulated brokerage, Composer is excellent. If you want to run strategies on prediction markets with your own keys and your own code, Composer can't get there and Banger is built for exactly that.

FAQ

Can you trade Polymarket or Kalshi on Composer?: No. Composer is a registered US broker-dealer focused on equities and ETFs, and does not support prediction markets like Polymarket or Kalshi. Banger is built specifically for those venues.
Is Banger a good Composer alternative?: For prediction markets, yes. Banger automates strategies on Polymarket and Kalshi, lets you write real Python or clone a strategy, paper-trades against live market data first, and never holds your funds. Composer remains the stronger choice if your goal is automated equity and ETF investing.

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