curl "https://api.chatgrid.ai/v1/me/usage" \
  -H "Authorization: Bearer cgk_live_a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6"

{
  "object": "usage",
  "data": {
    "credits_remaining": 4200,
    "total_credits_allocated": 5000,
    "monthly_allowance": 5000,
    "purchased_credits": 0,
    "last_reset_at": "2026-03-01T00:00:00.000Z",
    "updated_at": "2026-03-15T12:00:00.000Z"
  }
}