curl -X POST "https://api.globalwebindex.com/v2/waves/filter" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{"namespaces": [{"code": "core"}]}'

{
  "waves": [
     {
      "id": "69",
      "name": "Q4 2023",
      "accessible": true,
      "code": "q4_2023",
      "date_start": "2023-10-01T00:00:00Z",
      "date_end": "2023-12-31T00:00:00Z",
      "kind": "quarter",
      "namespaces": [
        {
          "code": "core"
        }
      ]
    },
    {
      "id": "70",
      "name": "Q1 2024",
      "accessible": true,
      "code": "q1_2024",
      "date_start": "2024-01-01T00:00:00Z",
      "date_end": "2024-03-31T00:00:00Z",
      "kind": "quarter",
      "namespaces": [
        {
          "code": "core"
        }
      ]
    },
    ...
  ]
}
Since you’re interested in the past year, you need to filter the data to include waves (time periods) that cover this range. For example, you’ll use waves from Q4 2023 to Q4 2024 .

​
What is a wave?

A wave represents the time period during which data was collected, such as quarterly or yearly intervals. Waves allow us to analyze trends over time or focus on specific periods. To retrieve available waves for the core namespace, use the Waves Filter Endpoint. From the responses, you can identify the waves that cover the past year (q4_2023, q1_2024, q2_2024, q3_2024, q4_2024). 
curl -X POST "https://api.globalwebindex.com/v2/waves/filter" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{"namespaces": [{"code": "core"}]}'

{
  "waves": [
     {
      "id": "69",
      "name": "Q4 2023",
      "accessible": true,
      "code": "q4_2023",
      "date_start": "2023-10-01T00:00:00Z",
      "date_end": "2023-12-31T00:00:00Z",
      "kind": "quarter",
      "namespaces": [
        {
          "code": "core"
        }
      ]
    },
    {
      "id": "70",
      "name": "Q1 2024",
      "accessible": true,
      "code": "q1_2024",
      "date_start": "2024-01-01T00:00:00Z",
      "date_end": "2024-03-31T00:00:00Z",
      "kind": "quarter",
      "namespaces": [
        {
          "code": "core"
        }
      ]
    },
    ...
  ]
}