API URL :
I use it TheSportDB
this is a little piece of result:
{
"leagues": [{
"idLeague": "4328",
"strLeague": "English Premier League",
"strSport": "Soccer",
"strLeagueAlternate": "Premier League"
},
{
"idLeague": "4329",
"strLeague": "English League Championship",
"strSport": "Soccer",
"strLeagueAlternate": "Championship, Sky Bet Championship"
}
]
}