An obscure feature of : common operations have public APIs callable by everyone without an account. For example,expandtemplates evaluates arbitrary wikitext. If the data you're looking for is already inside a template, it means it's a free machine-readable API. Example: Query the Japanese and English titles of the second soundtrack in 6 Stage 5.

user@localhost ~/code/th_ost_db_2 $ curl 'https://thwiki.cc/api.php' -G \
> -d "action=expandtemplates" \
> -d 'text={{红魔乡音乐名|2|5-2}},{{红魔乡音乐名|4|5-2}}' \
> -d "prop=wikitext" -d "format=json" \
> 2>/dev/null | jq
{
  "expandtemplates": {
    "wikitext": "月時計 ~ ルナ・ダイアル,Lunar Clock ~ Luna Dial"
  }
}
user@localhost ~/code/th_ost_db_2 $
0

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