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I found this https://github.com/tcgoetz/GarminDB, it looks like the thing you're talking about. However it doesn't use "the" API or a API: It web-scrapes the data from your "Daily Summary" page on Garmin Connect. It can also import data that has been exported (manually) from Garmin Connect. Neither of these two are an API.
There is an unofficial/unsupported/reverse-engineered go library for the API https://github.com/abrander/garmin-connect but I have not tested it (and if it is unofficial I'm also not interested as it can go away at any point if Garmin wants...).