Technical indicators API

RSI, SMA, and EMA from the same price history

Data Captain derives technical indicators from ETF closing prices so your dashboard can show trend and momentum without maintaining a separate calculation pipeline.

Get API key Read the docs

Key endpoints

GET/api/indicators/:symbol
RSI / SMA / EMA snapshot
GET/api/stocks/:symbol/history
Raw series for custom indicators
GET/api/stocks/:symbol/snapshot
Quote + indicators bundle

Why teams use Data Captain

Derived from real history

Indicators are calculations over OHLCV — not independent feeds. Warm-up windows and periods are documented in the API response context.

Research-ready, not signals

Expose RSI and moving averages as research inputs. Pair with price charts and explicit risk disclosures in your product.

Custom math still possible

Need MACD variants or custom windows? Pull /history and compute on your side while using our endpoint for common defaults.

Common use cases

Trading education apps
ETF research dashboards
Alert prototypes (with your own rules)
Snapshot cards for watchlists

FAQ

Which indicators are included?

The indicators endpoint returns commonly used values such as RSI and moving averages based on recent closes. Exact fields depend on plan and available history for the symbol.

Why might my RSI differ from another site?

Adjustment method, period length, and smoothing (e.g. Wilder) change results. Always document the period and source date next to the number.

Historical stock API →RSI API guide →SMA & EMA guide →

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