At present, if you cross an island border the welcome messages won't always been shown until you go across it a few times (pillow.is-from.space - javaw_kPxc7qqnAw). Can it be made either consistent or a way to check whose island you're currently on? EDIT: Or even better than whose island you're currently on, an api endpoint for whose island governs specific coordinates.
Some players also like to keep their coordinates secret, so an api endpoint for island owner/coords wouldn't be ideal people who want to play like that.
But if people wanted to know who owns an island, they can just go over the border several times. The endpoint was for coords to name, not name to coords.
There are like only 300k islands to go through, checking them all and saving coords to each name wouldn't be the most difficult task, even with a ratelimit of 1 request / second it'd take 4 days max.