Market Data Agent
Trading & Backtesting Operations
Clean financial data in minutes. Stale prices, unit errors, and bad fills — caught before they corrupt your backtest.
About
A complete AI agent skill for downloading, cleaning, and validating financial market data via Yahoo Finance. Most agents can call yf.download(). Few handle what comes next: exchange calendar gaps, delisted tickers that silently go flat, pence-vs-pounds unit errors that inflate returns 100×, or corporate action artefacts that look like 50% overnight crashes. This skill gives your agent the full cleaning pipeline, quality checks, and judgment to catch all of it — and produces a written data quality report every single run so you always know what you're working with.
Core Capabilities
- - Multi-ticker download with yfinance (auto-adjusted for splits and dividends)
- - Exchange calendar alignment across US
- UK
- and international markets
- - Stale data detection via rolling zero-variance check with flagged date ranges
- - GBX/GBP unit error detection for London Stock Exchange tickers
- - Corporate action artefact detection (single-day ±50% return spikes)
- - Missing data reporting with per-ticker coverage statistics
- - Incremental dataset extension (append new dates to an existing CSV)
- - Standardised data quality report printed after every collection run
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One-time purchase
$29
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Details
- Type
- Persona
- Category
- Finance
- Price
- $29
- License
- One-time purchase
Works With
Works with OpenClaw, Claude Projects, Custom GPTs, Cursor and other instruction-friendly AI tools.
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