Get 90-day average prices for cards at a specific grade.

This endpoint returns paginated cards with their average price over the last 90 days for a specified grade. Optionally filter by search query or category.

To search by relevance instead of browsing page by page, see 90day-prices-by-grade-search.

Parameters:

• page: Page number for pagination (default: 1)
• page_size: Number of results per page (1-500, default: 100)
• grade: Required. Card grade (e.g., 'PSA 10', 'SGC 10', 'BGS 9.5')
• search: Optional search query for card name
• category: Optional category filter (e.g., 'Pokemon', 'Baseball')

Example curl:

# Get PSA 10 cards
curl -X POST -H "X-API-Key: your-api-key-here" \
     -H "Content-Type: application/json" \
     -d '{
       "page": 1,
       "page_size": 100,
       "grade": "PSA 10"
     }' \
     "https://api.cardhedger.com/v1/cards/90day-prices-by-grade"

# Search with filters
curl -X POST -H "X-API-Key: your-api-key-here" \
     -H "Content-Type: application/json" \
     -d '{
       "page": 1,
       "page_size": 50,
       "grade": "SGC 10",
       "search": "Pikachu",
       "category": "Pokemon"
     }' \
     "https://api.cardhedger.com/v1/cards/90day-prices-by-grade"

Returns paginated cards with 90-day average price and sales count.