I have used the knowledge graph API before and it worked fine. I tried to access it today and it gives me no results at all. Here is my sample request and response.
GET Request:
https://kgsearch.googleapis.com/v1/entities:search?query=taylor+swift&key=MY_API_KEY&limit=1&indent=True
Response:
{
"@context": {
"@vocab": "http://schema.org/",
"goog": "http://schema.googleapis.com/",
"EntitySearchResult": "goog:EntitySearchResult",
"detailedDescription": "goog:detailedDescription",
"kg": "http://g.co/kg"
},
"@type": "ItemList",
"itemListElement": []
}