Cup Finder is a technical indicator designed to identify and validate rounding price patterns known as "Cups" and "Inverted Cups" using Euclidean geometry and density-based validation. It analyzes high and low price pivots over a historical lookback period to detect price curvature by identifying local peaks or troughs within a 30-bar window, establishing an anchor point for potential patterns. The indicator projects a semicircular arc between this anchor and the current price and calculates a content rate to confirm that a minimum percentage of bars remain within a defined price channel around the arc.

Visual signals include green arcs indicating bullish rounding bottoms with a horizontal dotted resistance line, and red arcs indicating bearish rounding tops with a support line. Information labels display the pattern's radius and geometric accuracy percentage. Key adjustable parameters include search period, channel amplitude, content rate threshold, and breakout source (close or high/low crossing the rim line).

Typical use cases involve breakout trading, trend reversal identification, and defining structural support or resistance levels. The indicator targets intermediate to advanced price action and systematic traders seeking mathematical confirmation of rounding patterns. It requires at least 292 bars of historical data and may repaint or update arcs as price evolves. Supported markets include Forex, stocks, commodities, indices, and cryptocurrencies such as BTCUSD, EURUSD, GBPUSD, and XAUUSD.