I am looking for a data service which is in between realtime stream quote and intraday 20-minute delayed quote. To be more specific, I am looking a data service which allows me to download the snap quote of all trading stocks with no delay or little delay. For example, a stream broadcast service which continuously sends me the snapshot of all stock quotes every one or a few minute. Such kind of design provides most flexibility to potencial powerful third-party market screeners without incurring bandwidth overload problem. For example, with even 10000 symbols in the watchlist, less than 100 bytes is required every update. If the update period is adjusted according to the user's service agreement or bandwidth constraint, the bandwidth (thus the cost) of the vendor can be controlled. I am wonder whether such near realtime snapquote service is available on the market or not? If not, who is rich and willing to provide some fund to put it into a business adventure?