Add massive-heatmap: live cross-asset market heatmap demo#17
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…tmap A Node + TypeScript backend with a React + Vite frontend that renders a market-cap-weighted treemap colored by percent change across stocks, ETFs, crypto, forex, indices, and futures. The backend holds the Massive API key and brokers all data: it seeds prior-close baselines and serves current prices over two REST endpoints (/api/snapshot, /api/prices), and the browser polls on a configurable interval (2 to 60 seconds). Includes 18 prebuilt universes, selectable lookbacks, session awareness, zoom and pan, hover details, and branded PNG export. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What this adds
examples/websocket/massive-heatmap/— a full-TypeScript, Finviz-style live market heatmap. Pick an asset class (Stocks, ETFs, Crypto, Forex, Indices, Futures) and a universe (e.g. S&P 500, Nasdaq 100); the screen fills with sector-grouped tiles, sized by market cap, colored by percent change versus the prior close, recoloring live by the second. A Capture button exports a branded PNG.Architecture
@massive.com/client-jsto poll a REST snapshot once for prior-close baselines, then streams per-second aggregates over one market WebSocket per asset class. Holds the API key server-side and pushes coalesced diffs (~5 Hz) to the browser. Bounded in-memory state (no growth).Verification
selectUniverseraces, seed-failure rejections, and disconnect-during-seed (see commit history).Known limitations
universes/(a snapshot; periodic refresh). Market caps were sourced from Massive reference data.Note on merging
Real-time WebSocket data requires an appropriate Massive plan. The
masterruleset requires a ticket-prefixed orBumpsquash-commit subject, so set the squash subject accordingly when merging.🤖 Generated with Claude Code