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Data ProviderStocks & Equities

Nasdaq Data Link (Quandl) API

Nasdaq Data Link (Quandl) API is a data provider from Nasdaq providing stocks & equities data. Nasdaq Data Link (the rebranded Quandl) is a broad commercial financial-data marketplace offering free and premium datasets for equities, indices, fundamentals, and economic/alternative data via REST, Streaming, and Tables APIs. A Polymarket bot would use it to pull historical and end-of-day/real-time stock and index prices to backtest and resolve "will TSLA/SPX close above $X" style equity and index markets.

At a glance

ProviderNasdaq
TypeData Provider
CategoryStocks & Equities
Real-timeYes — streaming
AuthAPI key
PricingFree tier (open datasets); premium datasets sold a la carte per subscription — Anonymous (no key): free, 20 calls/10 min and 50 calls/day, Free registered (API key): free access to open datasets, up to 50,000 calls/day, Premium datasets: per-dataset paid subscription, a la carte; price varies by dataset, Premium subscriber rate: up to 720,000 calls/day; no extra charge to use the API on top of a data subscription

What data it provides

  • End-of-day and historical equity prices (stocks/ETFs)
  • Index level data (e.g. S&P 500 / major indices)
  • Company fundamentals and financial statements datasets
  • Economic and alternative data feeds
  • Real-time and delayed market data on premium feeds
  • Curated free open datasets from central banks, governments and orgs

Features

  • REST API, Streaming API, and Tables API access methods
  • Official SDKs: Python, R, plus Excel add-in and SQL connectors
  • Rate limits: 50,000 calls/day (free key), up to 720,000/day (premium)
  • Anonymous capped at 20 calls/10 min, 50/day
  • JSON, CSV and XML output formats
  • Both real-time and delayed data available depending on dataset

Links

Use it in a bot

Other stocks & equities data sources

Listed, not endorsed. Pricing and capabilities change without notice — check the provider's own documentation before you depend on anything here. Browse the full data feeds directory or the strategy database.
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