curl --request POST \
  --url https://api.anysite.io/api/ecb/series \
  --header 'Content-Type: application/json' \
  --header 'access-token: <api-key>' \
  --data '
{
  "series": "<string>",
  "count": 2,
  "timeout": 300,
  "start_period": "2020",
  "end_period": "2024"
}
'

[
  {
    "key": "<string>",
    "dimensions": [
      {
        "id": "<string>",
        "code": "<string>",
        "@type": "@ecb_dimension_value",
        "label": "<string>"
      }
    ],
    "observations": [
      {
        "period": "<string>",
        "@type": "@ecb_observation",
        "value": 123,
        "obs_status": "<string>",
        "obs_status_label": "<string>",
        "obs_conf": "<string>",
        "obs_conf_label": "<string>",
        "obs_pre_break": "<string>",
        "obs_com": "<string>"
      }
    ],
    "@type": "@ecb_series",
    "title": "<string>",
    "title_complement": "<string>",
    "unit": "<string>",
    "unit_label": "<string>",
    "unit_mult": 123,
    "decimals": 123,
    "collection": "<string>",
    "source_agency": "<string>",
    "time_format": "<string>"
  }
]