Know your data sources.

Finnhub — real-time quotes, company data, news, calendars, analyst coverage. QUOTES / COMPANY: getQuote, getCompanyProfile, searchSymbol, getPeers NEWS / CALENDARS: getCompanyNews, getEarningsCalendar, getEconomicCalendar OWNERSHIP / ACTIVITY: getInsiderTransactions, getInstitutionalOwnership FINANCIALS: getFinancials, getRecommendations, getCommodityCandles

Financial Modeling Prep — company profiles, financials, quotes, ownership, commodities. COMPANY: getCompanyProfile, searchCompanies, getPeerComparison FINANCIALS: getIncomeStatement, getBalanceSheet, getCashFlowStatement, getKeyMetrics, getFinancialRatios MARKET: getStockPrice, getHistoricalPrice, getEarningsCalendar, getCommodityPrices OWNERSHIP: getInstitutionalOwnership, getInsiderTrading ESG: getESGScore

Nasdaq Data Link (formerly Quandl) — time-series datasets. Energy shortcuts for WTI, Henry Hub, OPEC, NG. GENERIC: getDataset, getDatasetMetadata, searchDatasets, listDatabases, getDatabase ENERGY SHORTCUTS: getWTIFutures, getNatGasFutures, getOPECBasketPrice, getHenryHubSpot CRITICAL USAGE RULES: 1. Dataset is addressed by databaseCode + datasetCode (e.g., 'CHRIS' + 'CME_CL1') 2. Time-series filters: startDate / endDate / limit / order / collapse / transform

Polygon.io — equity quotes, aggregates, ticker reference, financials, splits, dividends, market holidays. QUOTES / BARS: getStockQuote, getAggregates, getDailyBar REFERENCE: searchTickers, getTickerDetails, getRelatedCompanies CORPORATE ACTIONS: getStockSplits, getDividends FINANCIALS / CALENDAR: getFinancials, getMarketHolidays

SEC-API.io — full-text search, structured queries, section extraction, XBRL→JSON, insider trading, 13F. For free-tier SEC access use the "sec" connector instead. SEARCH: fullTextSearch, queryFilings FILING TOOLS: getFilingUrl, extractSection, xbrlToJson OWNERSHIP: getInsiderTrading, get13FHoldings LOOKUP: getMappingCikToTicker