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One of the leading professional data vendors. The company has been working in the financial information since 1984. IQFeed provides tick-by-tick unfiltered data, thus you will not miss about 50% of the actual trades.<br>
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{|style="border-collapse: collapse; border-width: 1px; border-style: solid; border-color: #cccccc"
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|style="border-collapse: collapse; border-width: 1px; border-style: solid; border-color: #cccccc"|'''Pro'''
|style="border-collapse: collapse; border-width: 1px; border-style: solid; border-color: #cccccc"|'''Con'''
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|style="border-collapse: collapse; border-width: 1px; border-style: solid; border-color: #cccccc"|Affordable price
|style="border-collapse: collapse; border-width: 1px; border-style: solid; border-color: #cccccc"|Not enough history data
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|style="border-collapse: collapse; border-width: 1px; border-style: solid; border-color: #cccccc"|Unfiltered data
|style="border-collapse: collapse; border-width: 1px; border-style: solid; border-color: #cccccc"|Insufficient coverage
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== Features and limitations ==
'''Features'''
# Automatic gap filling
# Automatic reconnection in case connection is lost
'''Limitations'''
# Since IQFeed has no identification of transactions there is no such a possibility to receive data for several charts simultaneously. All the paralleled queries are queued. Thus, if you make a query of the history for a long period of time there immediately comes the query for receiving several bars only as the program cannot draw data for the second query before the first is not processed
# There is no method for deleting a historical query since it is necessary to wait for a response for the previous query in order to begin to process the next one
# When plotting a chart for the Bid/Ask field of Minute, Day and etc, actually ticks will be requested because it is impossible to receive the history of minutes and days for Bid/Ask. It will deteriorate data reception performance
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== Setting up ==
# Make sure IQFeed 2.3 or higher is installed and functions properly.
# Make sure you're using a valid login/password.
No additional settings are required.
To create a symbol using IQFeed as the Data Source see see [[Operating_Symbol_List#Adding Symbol from Data Vendor Supplied List|Adding from a list supplied by data vendor]] section section for more detailed information.
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[[Category:Built-in_Data_Sources]]
