Join the 80,000 other DTN customers who enjoy the fastest, most reliable data available. There is no better value than DTN!

(Move your cursor to this area to pause scrolling)




"I "bracket trade" all major news releases and I have not found one lag or glitch with DTN.IQ feed. I am very comfortable with their feed under all typical news conditions (Fed releases, employment numbers, etc)." - Comment from Public Forum
"As a past ******* customer(and not a happy one), IQ Feed by DTN is a much better and cheaper product with great customer support. I have had no problems at all since switching over." - Comment from Public Forum
"If you want customer service that answers the phone, your best bet is IQFeed. I cannot stop praising them or their technical support. They are always there for you, and they are quick. I have used ****** too but the best value is IQFeed." - Comment from Public Forum
"And by the way, have to say this. I love the IQFeed software. It's rock solid and it has a really nice API." - Comment from Thomas via RT Chat
"IQ feed works very well, does not have all of the normal interruptions I have grown used to on *******" - Comment from Mark
"I use IQ Feed, Great stuff as far as data analysis information, storage and retrieval is concerned." - Comment from Public Forum
"I am keeping IQFeed, much better reliabilty than *******. I may refer a few other people in the office to switch as well." - Comment from Don
"Very impressed with the quality of your feed - ******* is a real donkey in comparison." - Comment from A.C. via Email
"I like you guys better than *******...much more stable and a whole lot fewer issues." - Comment from Philip
"I would just like to say that IQFeed version 4 is running very well and I am very happy with its performance. I would also like to extend a big thanks for the fast and efficient help that I always receive. My questions and concerns are always addressed promptly. Way to go!" - Comment from Josh in CO.
Home  Search  Register  Login  Recent Posts

Information on DTN's Industries:
DTN Oil & Gas | DTN Trading | DTN Agriculture | DTN Weather
Follow DTNMarkets on Twitter
DTN.IQ/IQFeed on Twitter
DTN News and Analysis on Twitter
»Forums Index »Product Support »Data and Content Support »How come BID > ASK ?
Author Topic: How come BID > ASK ? (3 messages, Page 1 of 1)

tamir
-Interested User-
Posts: 4
Joined: May 5, 2009


Posted: May 10, 2009 02:56 AM          Msg. 1 of 3
I am using IQFeed (via the XLQ C++ API) and I noticed that many times I get that the BID price exceeds ASK price.
(There is no change in the last update time so I guess these two prices belong to the same quote)

I provided the few following examples. All are within trading hours. I have hundreds of such examples. Nearly every stock has this phenomena at least once in a day.

BID ASK symbol last update time
6.51 6.5 SWHC 9:40:12
22.18 22.17 BRCM 9:54:15
26.29 26.28 ADBE 9:44:00
25.72 25.71 ADBE 10:22:32
25.55 25.54 ADBE 10:31:46


Tamir

Tamir

DTN_Steve_S
-DTN Guru-
Posts: 2086
Joined: Nov 21, 2005


Posted: May 11, 2009 04:07 PM          Msg. 2 of 3
Once in a while, it is possible that this sort of behavior can happen (the exchange will occasionally send values that don't make sense). However, if you are experiencing this as frequently as you say, I would suspect something else is wrong. Most likely data is getting "dropped" somewhere along the line.

Can you trap the occurances where this happens so we can get a timestamp as well as the data you recieve? Since we are talking about bids and asks, it would also be beneficial to have all of the bid/ask updates you recieved back until the most recent trade prior to the occurance. Also, can you give me an idea of how many symbols you are watching and what kind of symbols?

nsolot
-DTN Guru-
Posts: 273
Joined: Sep 4, 2004


Posted: May 11, 2009 06:08 PM          Msg. 3 of 3
I think we covered this topic a long while back, with Tim, before Steve was running this show.

Level 1 quotes consoldate from various "regional" exchanges. Sometimes a glitch at a regional causes quotes to go stale, and as a result the level 1 qoute gets crossed. I had suggested at one time that DTN add some logic to detect "stale" quotes and discard them from being used in the compostite Level 1 quote, but my sugegstion was not adopted.

The solution I utilize is to work with regional quotes for the active exhange (or two or three) for the issues you follow rather than the Level 1 quotes. The regional exchange quotes rarely get crossed and if they do, they usually resolve instantly.

Hope this helps.
 

 

Time: Sun May 15, 2022 11:31 PM CFBB v1.2.0 16 ms.
© AderSoftware 2002-2003