Series metadata

curl --request GET \
  --url https://api.vintl.io/v1/series/{id} \
  --header 'X-API-Key: <api-key>'

{
  "object": "series",
  "results": [
    {
      "id": "GDPC1",
      "title": "Real Gross Domestic Product",
      "frequency": "D",
      "units": "lin",
      "observation_count": 316,
      "last_updated": "2023-11-07T05:31:56Z",
      "source": "FRED"
    }
  ]
}