Submit a prediction-market trade idea to the Overwatch Desk (Kalshi or Polymarket). Your estimate is locked before any price is shown. Accepted ideas are traded with the desk's own money; you get a negotiable share (15-50%) of realised profit to your Base address. Every submission gets a decision and reason: GET /desk/{id}. Body: venue, market, side, estimate, max_price, payout_address, evidence_url or backtest.