# Real time callback different than historical quotes? **URL:** \ **Category:** Alpaca Market Data\ **Created:** [November 29, 2022, 5:54am UTC](https://forum.alpaca.markets/t/real-time-callback-different-than-historical-quotes/11171 "2022-11-29T05:54:06Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![Gergely\_Alpaca](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.alpaca.markets/gergely_alpaca/32/3210_2.png) [@Gergely\_Alpaca](https://forum.alpaca.markets/u/Gergely_Alpaca)\ **Post date:** [December 12, 2022, 9:15am UTC](https://forum.alpaca.markets/t/real-time-callback-different-than-historical-quotes/11171/3 "2022-12-12T09:15:24Z")
> [@Large Spread Gap in Real Time Data](https://forum.alpaca.markets/t/large-spread-gap-in-real-time-data/11206/4): > > Hey wave You’re comparing the free IEX stream with the SIP data in historical. Both StockDataStream and StockHistoricalDataClient has a feed argument. If you want quotes from all US exchanges, use the SIP value for the feed (this requires Unlimited Subscription for the stream and for the last 15 minutes in historical). If you want to get IEX quotes, use the IEX value. This means that only quotes from the IEX (v) exchange are included: you can see this in the ask\_exchange and bid\_exchange fiel… --- _[View the full topic](https://forum.alpaca.markets/t/real-time-callback-different-than-historical-quotes/11171)._