Definition. Proximity Support-Resistance (PSR) quantifies how near-price supply is distributed relative to the spot price, building on the dynamic framework of Cost Basis Distribution (CBD). The Proximity Support Index (PSI) is the share of proximity-weighted supply that lies below spot, and the Proximity Resistance Index (PRI) is the complementary share above spot.

Interpretation. Supply created at higher prices indicates potential resistance, and supply created at lower prices can give rise to potential support.

Notes. First introduced by Fountainhead Digital.