I don't know if you're still looking for / open to additional sources, but I've been looking at the
(which is billed on its homepage as "Unlimited Access, without stress, without identification") and here's the type of information you get from an artist search:
"data": [
{
"id": "9635624",
"name": "Billie Eilish",
"link": "https://www.deezer.com/artist/9635624",
"picture": "https://api.deezer.com/artist/9635624/image",
"picture_small": "https://e-cdns-images.dzcdn.net/images/artist/92b64dd0991caf4c03e4a2ac2283d9ed/56x56-000000-80-0-0.jpg",
"picture_medium": "https://e-cdns-images.dzcdn.net/images/artist/92b64dd0991caf4c03e4a2ac2283d9ed/250x250-000000-80-0-0.jpg",
"picture_big": "https://e-cdns-images.dzcdn.net/images/artist/92b64dd0991caf4c03e4a2ac2283d9ed/500x500-000000-80-0-0.jpg",
"picture_xl": "https://e-cdns-images.dzcdn.net/images/artist/92b64dd0991caf4c03e4a2ac2283d9ed/1000x1000-000000-80-0-0.jpg",
"nb_album": 19,
"nb_fan": 272375,
"radio": true,
"tracklist": "https://api.deezer.com/artist/9635624/top?limit=50",
"type": "artist"
},
{
"id": "9718618",
"name": "Billie Eilish & Goldhouse",
"link": "https://www.deezer.com/artist/9718618",
"picture": "https://api.deezer.com/artist/9718618/image",
"picture_small": "https://e-cdns-images.dzcdn.net/images/artist//56x56-000000-80-0-0.jpg",
"picture_medium": "https://e-cdns-images.dzcdn.net/images/artist//250x250-000000-80-0-0.jpg",
"picture_big": "https://e-cdns-images.dzcdn.net/images/artist//500x500-000000-80-0-0.jpg",
"picture_xl": "https://e-cdns-images.dzcdn.net/images/artist//1000x1000-000000-80-0-0.jpg",
"nb_album": 0,
"nb_fan": 24,
"radio": false,
"tracklist": "https://api.deezer.com/artist/9718618/top?limit=50",
"type": "artist"
},
{
"id": "9644252",
"name": "Billie Eilish & Blackbear",
"link": "https://www.deezer.com/artist/9644252",
"picture": "https://api.deezer.com/artist/9644252/image",
"picture_small": "https://e-cdns-images.dzcdn.net/images/artist//56x56-000000-80-0-0.jpg",
"picture_medium": "https://e-cdns-images.dzcdn.net/images/artist//250x250-000000-80-0-0.jpg",
"picture_big": "https://e-cdns-images.dzcdn.net/images/artist//500x500-000000-80-0-0.jpg",
"picture_xl": "https://e-cdns-images.dzcdn.net/images/artist//1000x1000-000000-80-0-0.jpg",
"nb_album": 0,
"nb_fan": 165,
"radio": false,
"tracklist": "https://api.deezer.com/artist/9644252/top?limit=50",
"type": "artist"
},
{
"id": "9644254",
"name": "Billie Eilish & Astronomyy",
"link": "https://www.deezer.com/artist/9644254",
"picture": "https://api.deezer.com/artist/9644254/image",
"picture_small": "https://e-cdns-images.dzcdn.net/images/artist//56x56-000000-80-0-0.jpg",
"picture_medium": "https://e-cdns-images.dzcdn.net/images/artist//250x250-000000-80-0-0.jpg",
"picture_big": "https://e-cdns-images.dzcdn.net/images/artist//500x500-000000-80-0-0.jpg",
"picture_xl": "https://e-cdns-images.dzcdn.net/images/artist//1000x1000-000000-80-0-0.jpg",
"nb_album": 0,
"nb_fan": 109,
"radio": false,
"tracklist": "https://api.deezer.com/artist/9644254/top?limit=50",
"type": "artist"
}
],
"total": 4
}
Once you get the artist ID you can do things like "Related" (truncated for space)
{
"data": [
{
"id": "5518450",
"name": "Melanie Martinez",
"link": "https://www.deezer.com/artist/5518450",
"picture": "https://api.deezer.com/artist/5518450/image",
"picture_small": "https://e-cdns-images.dzcdn.net/images/artist/cb72b850fd6a761bcdd2609c5eae8e3a/56x56-000000-80-0-0.jpg",
"picture_medium": "https://e-cdns-images.dzcdn.net/images/artist/cb72b850fd6a761bcdd2609c5eae8e3a/250x250-000000-80-0-0.jpg",
"picture_big": "https://e-cdns-images.dzcdn.net/images/artist/cb72b850fd6a761bcdd2609c5eae8e3a/500x500-000000-80-0-0.jpg",
"picture_xl": "https://e-cdns-images.dzcdn.net/images/artist/cb72b850fd6a761bcdd2609c5eae8e3a/1000x1000-000000-80-0-0.jpg",
"nb_album": 26,
"nb_fan": 294696,
"radio": true,
"tracklist": "https://api.deezer.com/artist/5518450/top?limit=50",
"type": "artist"
},
{
"id": "50633812",
"name": "Conan Gray",
"link": "https://www.deezer.com/artist/50633812",
"picture": "https://api.deezer.com/artist/50633812/image",
"picture_small": "https://e-cdns-images.dzcdn.net/images/artist/7907c9fd375e417e5ba35cb85c80b7a1/56x56-000000-80-0-0.jpg",
"picture_medium": "https://e-cdns-images.dzcdn.net/images/artist/7907c9fd375e417e5ba35cb85c80b7a1/250x250-000000-80-0-0.jpg",
"picture_big": "https://e-cdns-images.dzcdn.net/images/artist/7907c9fd375e417e5ba35cb85c80b7a1/500x500-000000-80-0-0.jpg",
"picture_xl": "https://e-cdns-images.dzcdn.net/images/artist/7907c9fd375e417e5ba35cb85c80b7a1/1000x1000-000000-80-0-0.jpg",
"nb_album": 4,
"nb_fan": 2945,
"radio": true,
"tracklist": "https://api.deezer.com/artist/50633812/top?limit=50",
"type": "artist"
},
}