List treasury yield rates

curl --request GET \
  --url https://api.vintl.io/v1/treasury/yields \
  --header 'X-API-Key: <api-key>'

{
  "object": "yield_series",
  "results": [
    {
      "trade_date": "2026-03-24T00:00:00Z",
      "maturity": "10Y",
      "rate": "4.39",
      "curve_type": "PAR"
    }
  ],
  "results_count": 123,
  "has_more": true,
  "next_cursor": "<string>"
}