Is there any publicly available trade indexer besides poe.trade?

There are faster indexers out there. I have been testing dropping very good items in my public tabs at super cheap prices to see what happens. First I set up poe.trade to live search for item I'm about to drop in the cheap tab which they say it's instant but it's not. I get WTB's from people sometimes a minute before it appears on poe.trade live search. What tools are they using?

Anyone is free to test this themselves. Take a good item and drop in your 1c tab but before setup poe.trade to live search for that item. You will be bombarded well before poe.trade notifies you with a "woop"

Don't put good items in 1c tabs? lol

People have their own private indexers they have written.