Get daily counts of cards newly added to the catalog.

Returns per-day addition counts grouped by category, set, and subset — useful for tracking catalog growth and spotting new releases. Data is refreshed daily.

Example curl:

# Cards added since March 1st
curl -X POST "https://api.cardhedger.com/v1/cards/additions-summary" \
     -H "X-API-Key: your-api-key-here" \
     -H "Content-Type: application/json" \
     -d '{"start_date": "2026-03-01"}'

# Baseball cards added in a date range
curl -X POST "https://api.cardhedger.com/v1/cards/additions-summary" \
     -H "X-API-Key: your-api-key-here" \
     -H "Content-Type: application/json" \
     -d '{"start_date": "2026-03-01", "end_date": "2026-03-15", "category": "Baseball"}'

{
  "data": [
    {
      "added_date": "2026-03-15",
      "card_count": 42,
      "category": "Baseball",
      "set_name": "2024 Topps Chrome Baseball",
      "subset": "Base Set",
      "variants": "Base, Gold, Refractor"
    },
    {
      "added_date": "2026-03-14",
      "card_count": 18,
      "category": "Pokemon",
      "set_name": "2024 Pokemon Prismatic Evolutions",
      "subset": "Illustration Rare",
      "variants": "Base"
    }
  ],
  "page": 1,
  "page_size": 50
}