market heatmap APIETFdashboard
Market Heatmap API for ETF Dashboards
Create ETF market heatmaps from cached return metrics, consistent baskets, and clear color scales.
By Data Captain Research Team6 min read
What an ETF heatmap communicates
A heatmap compresses many fund returns into one view. Each cell represents an ETF, while color represents performance over a selected period. The visualization is most useful when the basket and period are explicit.
Design the API response
Return symbol, display name, return value, latest price, metric date, and optional asset class. Keep the color palette in the UI so API consumers can match their own design system.
- Use a symmetric color scale around zero
- Show exact values in tooltips
- Do not mix return periods
- Label stale or unavailable metrics
Pre-compute for predictable latency
Calculating multi-year returns for every heatmap request is wasteful. Update ETF metrics after the daily price ingest and serve the cached rows. This makes both public dashboards and client applications faster.
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