# Data Source of Data API v2

**URL:** <https://forum.alpaca.markets/t/data-source-of-data-api-v2/9764>\
**Category:** Alpaca Market Data\
**Created:** [June 14, 2022, 9:05pm UTC](https://forum.alpaca.markets/t/data-source-of-data-api-v2/9764 "2022-06-14T21:05:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![aladdin](https://avatars.discourse-cdn.com/v4/letter/a/e480ec/32.png) [@aladdin](https://forum.alpaca.markets/u/aladdin)\
**Post date:** [June 14, 2022, 9:05pm UTC](https://forum.alpaca.markets/t/data-source-of-data-api-v2/9764/1 "2022-06-14T21:05:07Z")

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What data source does Alpaca get the SIP data from for data API v2? It is not clear from the following link. I know Alpaca’s data API v1 used Polygon as the data source. Any insight is helpful. Thanks!

> **[Stock Pricing API](https://alpaca.markets/docs/api-references/market-data-api/stock-pricing-data/)**
>
> Alpaca Market Data API provides real-time & 5+ years of historical stock pricing data.

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**Author:** ![masjaya.sutarno](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.alpaca.markets/masjaya.sutarno/32/3364_2.png) [@masjaya.sutarno](https://forum.alpaca.markets/u/masjaya.sutarno)\
**Post date:** [June 15, 2022, 3:25am UTC](https://forum.alpaca.markets/t/data-source-of-data-api-v2/9764/2 "2022-06-15T03:25:32Z")

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Hi @aladdin

For the SIP Data, we receive direct feeds from the CTA (administered by NYSE) and UTP (administered by Nasdaq) SIPs. These 2 feeds combined offer 100% market volume.  
feel free to check out our [Docs](https://alpaca.markets/docs/market-data/#subscription-plans) if you think that might help.