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vj88-coder/README.md

VoidLab

Independent studio building open market-data infrastructure.

PairBook tracks correlation, beta, volatility and issuer-sourced ETF holdings overlap across 4,700+ US stocks and ETFs, refreshed every trading day after the US close. Any of the 11.3 million possible pairs can be tested through the free JSON API with no key, the dataset downloads published under CC BY 4.0 with a DOI, or the MCP server and CLI on npm (npx -y pairbook-mcp).

Live from the API right now:

SPY vs TLT correlation QQQ vs VOO correlation

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  1. pairbook pairbook Public

    Correlation, covariance and true holdings overlap for 4,700+ US stocks and ETFs. Free JSON API, refreshed every trading day.

    Python 1

  2. pairbook-mcp pairbook-mcp Public

    MCP server & CLI for portfolio risk analysis and stock/ETF correlation: Euler risk contributions, issuer-sourced ETF overlap, 11.3M testable pairs across 4,700+ US assets, refreshed daily. Free, no…

    JavaScript