curl --request GET \
  --url https://api.hayinsights.com/openapi/v1/macro/monetary-policy/rates-yields \
  --header 'X-API-Key: <api-key>'

{
  "success": true,
  "statusCode": 200,
  "data": [
    {
      "observationDate": "2026-02-01",
      "country": "JP",
      "tenYearsGovernmentBondYieldsPct": 2.31,
      "overnightCallRate": 0.71
    },
    {
      "observationDate": "2026-03-01",
      "country": "JP",
      "tenYearsGovernmentBondYieldsPct": 2.35,
      "overnightCallRate": 0.73
    }
  ],
  "meta": {
    "timestamp": "2026-06-19T08:50:42.552Z"
  }
}