curl --request GET \
  --url https://api.mixpeek.com/v1/organizations/billing/usage/vector-backend \
  --header 'Authorization: Bearer <token>'

{
  "vector_backend": "<string>",
  "billing_month": "<string>",
  "namespace_count": 123,
  "vectors_stored": 123,
  "storage_bytes": 123,
  "queries": 123,
  "writes": 123,
  "cost_breakdown": {
    "backend": "<string>",
    "vector_storage_usd": 123,
    "data_storage_usd": 123,
    "query_usd": 123,
    "write_usd": 123,
    "total_usd": 123,
    "total_credits": 123
  },
  "total_credits": 123,
  "total_cost_usd": 123
}