Most ADWs now have API's to accept bets, you can just set up a server to push them through it or you can remote desktop in.
Amwager is working towards incorporating pool data into theirs which would be great, but horse racing data is so monopolized by trackmaster I doubt they'll be able to do it for free.
I think the new big "whales" of corporations introduced weird dynamics into the game. It used to be beneficial to bet last second, but I think betting 5 minutes before post is better now. You see this in China too. There's a lot more 1/9, 1/5 especially in harness, but sometimes they go overboard and create a lot of inefficiencies.
Been hitting a lot of mid odds like 7/1 - 12/1 because the 1/9 horse breaks or just doesn't show up and some big corp dumped way too much money on it.
Best I saw was there was I think maiden stakes race at The Red Mile and someone dropped about 50k on this one horse to show. The Red Mile doesn't even get 50k on show combined across all races in a typical race day. The horse wasn't that good, it was a 10 horse race, and I remember the horses were all really young and didn't have a lot of experience. Dropped $100 to show and place on every other horse, the 50k show horse breaks coming out of the gate.
Top 3 paid
84.40/110/38.20
0/177.6/150
0/0/90.6
Free 27k
https://www.trackinfo.com/results.js...HLEX08/16/2018