The options for torrent indexers are pathetic. With KAT gone, RARBG is the only good source. HDBitz and Torrentleech are good but most people can’t use them without getting an invite. Would be nice if a few more public trackers got added.
I myself have access to HDBitz and Torrentleech but my noob friends (and most people who aren’t heavy users) don’t. Adding trackers like TPB would be great for the average joe. At least for the sake of variety. Most release groups operate on public trackers such 4K / HEVC and it would be great to have access to them.
TPB doesn’t have an API. SR does it by using website scraping, which is hard to maintain and creates additional load for website.
Google Jackett-Public. Which is a proxy that basically does the same, website scraping. It’s an earlier version of Jackett, before it went private-tracker only.
You won’t be able to click search and Sonarr process the results, it will only work for picking up new releases from the RSS feed, which is the automatic way Sonarr finds releases, searching is only used if you want to find old episodes of a series or if you missed one.
You need to look at their site for documentation or mention of it, googling site name + api usually yields something to dig into further, if you can’t find anything concrete the answer is probably they don’t because most don’t.
Zooqle (explains why I couldn’t find it because you had written Zoogle) does not have an API that Sonarr could use, the API they do have (a link to it is at the bottom right of the page) is for release information only, not searching for releases.
1337x.pl doesn’t look to have an API I see some people have written tools to screen scrape their site, probably something the Jackett public project could add if it doesn’t have support already.