data-sources

name	data-sources
description	Use this skill when the user asks about available data, data quality, supported fields, provider capabilities, or when you are unsure whether a specific data field (such as options data, real-time quotes, or intraday data) is available from the currently active provider. Also use before fetching unusual data types to confirm the active provider supports them.
license	MIT
metadata	{"author":"quantagent","version":"1.0"}
allowed-tools	get_stock_quote, get_ohlcv_data, get_stock_fundamentals, get_earnings_calendar, get_sector_performance, get_economic_indicators

Data Sources

Overview

QuantAgent supports multiple data providers. The active provider is set by the user via /provider. Before fetching any data, confirm the active provider supports the required fields. Never assume all providers return the same fields.

Provider Capability Matrix

Capability	yfinance	alpha_vantage	polygon
OHLCV (daily)	✅	✅	✅
OHLCV (intraday)	✅ delayed	✅ delayed	✅ real-time
Real-time quotes	❌ 15m delay	❌ 15m delay	✅
Fundamentals	✅	✅	✅
Options chain	✅	❌	✅
Crypto	✅	✅	✅
News	✅	✅	✅
Earnings calendar	⚠️ next date only	✅	✅
Sector performance	✅ via ETFs	✅ native	✅ via ETFs
Economic indicators	⚠️ VIX, yields only	✅ full	❌

Rate Limits

• yfinance: ~2000 requests/hour; no API key required
• alpha_vantage: 25 requests/day (free tier); key required
• polygon: based on plan; key required; real-time on paid plans

Known Limitations

• yfinance: dividend and split data may lag by 1 trading day
• yfinance: earnings calendar returns only the next earnings date, not a full calendar
• yfinance: economic indicators limited to VIX and treasury yields; GDP/CPI/unemployment unavailable
• alpha_vantage: free tier makes full stock screening impractical
• polygon: economic indicators not available (equity-focused API)
• All providers: intraday data older than 60 days may be incomplete
• Fundamentals coverage varies — always check if fields are None before using them

Supporting files

• field_reference.md — full list of field names returned by each data function