It’s version 5. https://dev.twitch.tv/docs/v5/guides/using-the-twitch-api/#requests
{
"game": {
"name": "League of Legends",
"popularity": 85798,
"_id": 21779,
"giantbomb_id": 24024,
"box": {
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"medium": "https://static-cdn.jtvnw.net/ttv-boxart/League%20of%20Legends-136x190.jpg",
"small": "https://static-cdn.jtvnw.net/ttv-boxart/League%20of%20Legends-52x72.jpg",
"template": "https://static-cdn.jtvnw.net/ttv-boxart/League%20of%20Legends-{width}x{height}.jpg"
},
"logo": {
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"medium": "https://static-cdn.jtvnw.net/ttv-logoart/League%20of%20Legends-120x72.jpg",
"small": "https://static-cdn.jtvnw.net/ttv-logoart/League%20of%20Legends-60x36.jpg",
"template": "https://static-cdn.jtvnw.net/ttv-logoart/League%20of%20Legends-{width}x{height}.jpg"
},
"localized_name": "League of Legends",
"locale": "en-us"
}
}