Screen Positions

Screen positions

Steps

1. Apply each criterion as a predicate against the latest bar of each ticker's enriched frame.
2. Common screens (start here):
   • oversold_rsi: RSI_14 < 30
   • overbought_rsi: RSI_14 > 70
   • golden_cross: SMA_50 crosses above SMA_200 (vs. previous bar — not just SMA_50 > SMA_200)
   • death_cross: SMA_50 crosses below SMA_200
   • near_52w_high: latest close within 1% of trailing-252-bar max
   • near_52w_low: latest close within 1% of trailing-252-bar min
3. Return a structured result — for each matched ticker, list the criteria it matched and the values that triggered them.
4. Don't silently coerce — if a screen requires RSI_14 and a ticker doesn't have enough bars, skip that ticker for that screen with a reason.

Output shape

[
  {
    "ticker": "AAPL",
    "matched": ["overbought_rsi", "near_52w_high"],
    "values": {"RSI_14": 78.6, "close": 184.32, "52w_high": 185.00}
  }
]

Failure modes to avoid

• "Cross" detected as A > B instead of "A was <= B last bar, now > this bar".
• 52-week extremes computed from max(close) instead of max(high).
• Single threshold for all markets — equities RSI_14 < 30 ≠ crypto RSI_14 < 30 (volatility differs).
• Silent skip when a ticker lacks bars — surface it.