How often is the data on Nasdaq Data Link refreshed or updated?

Nasdaq Data Link offers both free and premium data - you can learn about the differences here.

Free data
Free data feeds do not have any regular, guaranteed update times; however, we do try to update free data as soon as possible after the original sources publish new data.

Premium data
Premium data feeds have regular, guaranteed update times so that users can plan their business processes around these updates.

Premium data feeds have different update times which are stated in the Documentation for each premium data feed. For example, if you go to the product page for the NASDAQ Stock Market Prices (XNAS) data feed, you can click on Documentation at the top. That will lead you here, where it states that the data is updated at 11:30pm ET on all trading days with the same day's data, i.e., a reporting lag of less than 1 business day.

Note that each data feed on Nasdaq Data Link is delivered through one of the following Nasdaq data Link APIs:

Streaming API for real-time data
REST API for real-time or delayed data
REST API for time-series
REST API for tables

You can learn more about these APIs, data formats and authentication here.

Data feeds that are described as "real-time" update on a real-time basis.

For data feeds that use the REST API for time-series or tables, it is possible to make API calls to see when the data was last refreshed:

Time-Series

To check when a time-series was last refreshed, you can make a metadata API call for that specific time-series, like this:

https://data.nasdaq.com/api/v3/datasets/XNAS/ACIW/metadata.json?api_key=YOURAPIKEY

The above call will return metadata for the XNAS/ACIW time-series. One of the metadata fields is "refreshed_at" which shows the time in UTC at which the data and/or metadata of this time-series was most recently refreshed. Another field is "newest_available_date" which shows the most recent date of all available data points in this time-series. For definitions of the other metadata fields, please see here.

Please note that just because a time-series was "refreshed" at a particular time, it does not necessarily mean any new, updated data was added at that time.

Tables

To check when a table was last refreshed, you can make a metadata API call for that specific table, like this:

https://data.nasdaq.com/api/v3/datatables/SHARADAR/SEP/metadata.json?api_key=YOURAPIKEY

The above call will return metadata for the SHARADAR/SEP table. One of the metadata fields is "refreshed_at" which shows the time in UTC at which the data and/or metadata of this table was most recently refreshed.

Please note that just because a table was "refreshed" at a particular time, it does not necessarily mean any new, updated data was added at that time.