Data fees for whom? TD Ameritrade provides their market feed to their clients for free if that is what you were asking. If you're asking what the cost would be for whole data pipe for all US traded stocks for the server-side model - https://www.nyse.com/publicdocs/nyse/data/NYSE_Market_Data_Pricing.pdf - that is just for NYSE. Look at page 28. The use for scanners would qualify as "Non-display use". I am pretty sure that "per user fee" would also apply. Not sure what "Enterprise fee" is. It is not cheap.
The real question is : can we truly profit from these high-low crossings events in the first place, and to what extent?
Data fees for the setup you lay out here, ...''run on the server in real time on the full data pipe of the stock universe.''
That PDF I gave above is a start. I could ask some people what it is costing them I guess. I think it is quite a bit - enough that the cost of starting something like that would be prohibitive, since you'd be carrying a lot of fixed costs and you'd have to have a lot of users to cover them. And I am not sure just how big a demand for something like this would be. On edit: found this interesting tool: https://prooftrading.com/mktdata/ I threw in NYSE family and Nasdaq basic trade/BBO feeds. 1 user. Around 20K/month. Strictly NYSE and Nasdaq - about 10K/month. Increase of # of users doesn't increase the cost that much. This of course doesn't include the cost of the hardware and bandwidth infrastructure.
There are two programs which meet the thread starter´s needs: Thinkorswim and TC 2000. I think with TC 2000 it´s easier to set up a scanner but it costs. TOS is for free if you are a customer.
Trade-Ideas can do that with the new high/new low filter: https://www.trade-ideas.com/ProductHelp.html#alert_types
Could you explain on how a new high/new low filter can give me signals for crossing the previous day low/high?
I have reached out to TC2000 and they confirmed it could be done with something like this on a daily timeframe: L<L1 / C>L1 (todays low lower than yesterdays low and todays close higher than yesterdays low). That might do the job for me so i will check TC2000 out soon.