CoinGecko API
Crypto prices and market data
The CoinGecko API serves prices, market data, exchange data and metadata for thousands of crypto assets. It offers a free demo plan and paid plans with higher limits.
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Alpha Vantage
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EOD Historical Data
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Financial Modeling Prep
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Finnhub
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FRED API
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Economic time series from the St. Louis Fed
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Market data APIs for stocks, options and crypto