For the 15-Min Delayed SIP feed, the prices are available in the API within a short time-span. Delays can occur from SIP in certain circumstances, but it's not because of anything with Intrinio. What happens is a trade occurs, and then a time period later, it's reported to the exchange, which is when they inform Intrinio, and it becomes available in the API. On rare occasions, this can take up to a day, usually due to dark pool trades.