https://www.reddit.com/r/TravelHacks/comments/14zh0k5/aside_from_scotts_cheap_flights_does_anyone_use/
I did notice that ITA Matrix is listed there and powers the Google Flight search. But, it doesn't appear to have an API.
I want to watch several cities as origin points and then look for inexpensive international connections to several cities and see if there is an inexpensive option. I'm hoping to take my three kids to Europe this summer but even now the flights are all about $1500 per person. I know sometimes airlines post erroneous fares and maybe I'll catch one of those?
Are there any options for home grown and managed solutions like this? It seems like a fun hobby project.