What is Chart Library?

Chart Library is a chart-pattern intelligence engine for humans and AI agents. Anchor any (symbol, date, timeframe) and it returns the cohort of historical analogs — from 25M+ indexed patterns across 19,000+ symbols and 10 years — what those analogs did next, and a calibrated forward-return distribution, over web, REST API, and MCP.

Does Chart Library predict stock prices?

No. Chart Library never forecasts. It returns historical distributions — what actually happened after setups like yours (median, p10/p90 band, up rate) — plus the receipts to audit them. Direction and decisions stay with you or your agent.

How calibrated are Chart Library's bands?

The nominal 80% forward-return band held 80.8% across 300,000+ live, audited cases under symbol-disjoint evaluation. The coverage record is public and recomputed continuously at chartlibrary.io/calibration.

Rarity radar · 2026-07-31

HOOD just had its steepest 20-day drop since Feb 2026

HOOD's 20-day move is at -23% — steepest 20-day drop, in the top 7% of its 10-year range. The last 9 times HOOD reached this extreme, the median move over the next 15 trading days was +2.3% (56% finished higher).

20-day move

-23%

top 7% in 10yr

Next 15d median

+2.3%

56% higher

Last seen

Feb 2026

Read this honestly

This is a base rate from HOOD's own history — what happened after prior visits to this extreme — not a prediction. 9 prior cases is a guide, not a guarantee. Extremes can persist far longer than they "should."

How Rarity Radar works

We measure HOOD on several conditions (distance from its 200-day average, RSI, recent momentum) against its own 10-year history, then surface the single most extreme one and the empirical forward returns that followed prior visits to that extreme.

Go deeper

See HOOD's full cohort of historical analogs and calibrated outcome distribution:

HOOD cohort →Open in Chart Library

Other extremes on the radar