SMA and EMA API Guide for Market Applications

A simple moving average assigns equal weight to every close in its window. An exponential moving average assigns more weight to recent values, so it responds faster to price changes while retaining information from prior observations.

An indicator endpoint should accept symbol, period, date range, and optionally the source field. Return dated values rather than only the latest number so users can plot and validate the calculation.

A 200-day average needs at least 200 observations before its first complete value. Fetch additional history before the visible range, distinguish null from zero, and tell consumers when the requested symbol lacks enough data.