Sviluppo TradingBot
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# Historical Stock Data
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This API provides historical market data for equities. Check the [API Reference](https://docs.alpaca.markets/reference/stockbars) for detailed descriptions of all REST endpoints.
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# Data Sources
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Alpaca offers market data from various data sources described below. You can use the `feed` parameter on all the stock endpoints to switch between them.
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<Table align={["left","left"]}>
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<thead>
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<tr>
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<th>
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Source
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</th>
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<th>
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Description
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</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>
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**iex**
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</td>
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<td>
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IEX ([The Investors Exchange](https://www.iexexchange.io/)) is ideal for initial app testing and situations where precise pricing may not be the primary focus. It's a single US exchange that accounts for approximately \~2.5% of the market volume.
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ℹ️ This is the only feed that can be used without a subscription.
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</td>
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</tr>
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<tr>
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<td>
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**sip**
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</td>
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<td>
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This feed covers all US exchanges, originating directly from exchanges and is consolidated by the Securities Information Processors: [UTP](https://utpplan.com/) (Nasdaq) and [CTA](https://www.nyse.com/data/cta) (NYSE). These SIPs play a crucial role in connecting various U.S. markets, processing and consolidating all bid/ask quotes and trades from multiple trading venues into a single, easily accessible data feed.
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Our data delivery ensures ultra-low latency and high reliability, as the information is transmitted directly to Alpaca's bare metal servers located in New Jersey, situated alongside many market participants.
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SIP data is particularly advantageous for developing your trading app, where precise and up-to-date price information is essential for traders and internal operations. It accounts for 100% of the market volume, providing comprehensive coverage for your trading needs.
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</td>
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</tr>
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<tr>
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<td>
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**boats**
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</td>
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<td>
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[Blue Ocean ATS](https://blueocean-tech.io/) is the first alternative trading system to expand market hours, filling the gap to trade equities continuously throughout US evening hours.
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</td>
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</tr>
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<tr>
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<td>
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**overnight**
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</td>
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<td>
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Our "overnight" feed is Alpaca's derived feed from the original BOATS source. It offers a cheaper, but slightly less accurate alternative for overnight US market data. The trades are 15 minutes delayed and adjusted to fit the bid-ask spread.
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</td>
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</tr>
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</tbody>
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</Table>
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<br />
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