{
 "schema_version": 1,
 "slug": "gold-britannia-1oz",
 "name": "1 oz British Gold Britannia",
 "metal": "gold",
 "oz": 1,
 "first_snapshot": "2026-10-15T05:00:54+00:00",
 "last_snapshot": "2026-11-11T14:49:33+00:00",
 "days_with_data": 27,
 "snapshots": 514,
 "daily": [
  {
   "date": "2026-10-15",
   "snapshots": 20,
   "dealers_quoted": 5,
   "median_premium_pct": 2.91,
   "lowest_premium_pct": 2.15,
   "spread_pp": 2.29,
   "spot_avg": 4153.22
  },
  {
   "date": "2026-10-16",
   "snapshots": 7,
   "dealers_quoted": 4,
   "median_premium_pct": 2.82,
   "lowest_premium_pct": 1.93,
   "spread_pp": 2.48,
   "spot_avg": 4171.87
  },
  {
   "date": "2026-10-17",
   "snapshots": 2,
   "dealers_quoted": 4,
   "median_premium_pct": 2.83,
   "lowest_premium_pct": 2.24,
   "spread_pp": 2.1,
   "spot_avg": 4166.1
  },
  {
   "date": "2026-10-18",
   "snapshots": 12,
   "dealers_quoted": 4,
   "median_premium_pct": 2.85,
   "lowest_premium_pct": 2.27,
   "spread_pp": 2.09,
   "spot_avg": 4171.55
  },
  {
   "date": "2026-10-19",
   "snapshots": 32,
   "dealers_quoted": 4,
   "median_premium_pct": 2.84,
   "lowest_premium_pct": 2.5,
   "spread_pp": 1.92,
   "spot_avg": 4145.9
  },
  {
   "date": "2026-10-20",
   "snapshots": 22,
   "dealers_quoted": 4,
   "median_premium_pct": 2.79,
   "lowest_premium_pct": 2.17,
   "spread_pp": 2.43,
   "spot_avg": 4127.37
  },
  {
   "date": "2026-10-21",
   "snapshots": 7,
   "dealers_quoted": 4,
   "median_premium_pct": 2.73,
   "lowest_premium_pct": 2.17,
   "spread_pp": 2.35,
   "spot_avg": 4138.13
  },
  {
   "date": "2026-10-22",
   "snapshots": 23,
   "dealers_quoted": 4,
   "median_premium_pct": 2.93,
   "lowest_premium_pct": 2.43,
   "spread_pp": 2.05,
   "spot_avg": 4042.99
  },
  {
   "date": "2026-10-23",
   "snapshots": 27,
   "dealers_quoted": 4,
   "median_premium_pct": 2.86,
   "lowest_premium_pct": 2.62,
   "spread_pp": 2.31,
   "spot_avg": 4007.26
  },
  {
   "date": "2026-10-24",
   "snapshots": 30,
   "dealers_quoted": 4,
   "median_premium_pct": 2.84,
   "lowest_premium_pct": 2.16,
   "spread_pp": 2.34,
   "spot_avg": 3996.9
  },
  {
   "date": "2026-10-25",
   "snapshots": 31,
   "dealers_quoted": 4,
   "median_premium_pct": 2.84,
   "lowest_premium_pct": 2.16,
   "spread_pp": 2.34,
   "spot_avg": 3997.18
  },
  {
   "date": "2026-10-26",
   "snapshots": 17,
   "dealers_quoted": 4,
   "median_premium_pct": 2.97,
   "lowest_premium_pct": 2.8,
   "spread_pp": 1.73,
   "spot_avg": 4017.14
  },
  {
   "date": "2026-10-27",
   "snapshots": 7,
   "dealers_quoted": 4,
   "median_premium_pct": 2.99,
   "lowest_premium_pct": 2.79,
   "spread_pp": 1.82,
   "spot_avg": 4043.96
  },
  {
   "date": "2026-10-28",
   "snapshots": 2,
   "dealers_quoted": 4,
   "median_premium_pct": 2.9,
   "lowest_premium_pct": 2.24,
   "spread_pp": 2.27,
   "spot_avg": 4052.05
  },
  {
   "date": "2026-10-29",
   "snapshots": 18,
   "dealers_quoted": 4,
   "median_premium_pct": 2.95,
   "lowest_premium_pct": 2.26,
   "spread_pp": 2.73,
   "spot_avg": 4017.09
  },
  {
   "date": "2026-10-30",
   "snapshots": 25,
   "dealers_quoted": 4,
   "median_premium_pct": 3.8,
   "lowest_premium_pct": 2.93,
   "spread_pp": 2.35,
   "spot_avg": 3912.33
  },
  {
   "date": "2026-10-31",
   "snapshots": 24,
   "dealers_quoted": 4,
   "median_premium_pct": 3.04,
   "lowest_premium_pct": 2.29,
   "spread_pp": 2.35,
   "spot_avg": 3876.4
  },
  {
   "date": "2026-11-01",
   "snapshots": 22,
   "dealers_quoted": 4,
   "median_premium_pct": 3.04,
   "lowest_premium_pct": 2.28,
   "spread_pp": 2.36,
   "spot_avg": 3884.73
  },
  {
   "date": "2026-11-02",
   "snapshots": 7,
   "dealers_quoted": 4,
   "median_premium_pct": 2.93,
   "lowest_premium_pct": 0.96,
   "spread_pp": 3.55,
   "spot_avg": 3944.43
  },
  {
   "date": "2026-11-04",
   "snapshots": 20,
   "dealers_quoted": 3,
   "median_premium_pct": 2.94,
   "lowest_premium_pct": 2.81,
   "spread_pp": 1.78,
   "spot_avg": 4069.98
  },
  {
   "date": "2026-11-05",
   "snapshots": 19,
   "dealers_quoted": 4,
   "median_premium_pct": 3.14,
   "lowest_premium_pct": 2.84,
   "spread_pp": 1.6,
   "spot_avg": 4095.28
  },
  {
   "date": "2026-11-06",
   "snapshots": 23,
   "dealers_quoted": 4,
   "median_premium_pct": 2.96,
   "lowest_premium_pct": 1.79,
   "spread_pp": 2.71,
   "spot_avg": 4067.41
  },
  {
   "date": "2026-11-07",
   "snapshots": 19,
   "dealers_quoted": 3,
   "median_premium_pct": 3.04,
   "lowest_premium_pct": 2.93,
   "spread_pp": 1.36,
   "spot_avg": 4072.1
  },
  {
   "date": "2026-11-08",
   "snapshots": 21,
   "dealers_quoted": 3,
   "median_premium_pct": 3.04,
   "lowest_premium_pct": 2.93,
   "spread_pp": 1.36,
   "spot_avg": 4084.34
  },
  {
   "date": "2026-11-09",
   "snapshots": 27,
   "dealers_quoted": 3,
   "median_premium_pct": 3.73,
   "lowest_premium_pct": 3.04,
   "spread_pp": 1.49,
   "spot_avg": 4120.56
  },
  {
   "date": "2026-11-10",
   "snapshots": 37,
   "dealers_quoted": 2,
   "median_premium_pct": 3.71,
   "lowest_premium_pct": 2.93,
   "spread_pp": 1.63,
   "spot_avg": 4055.1
  },
  {
   "date": "2026-11-11",
   "snapshots": 13,
   "dealers_quoted": 2,
   "median_premium_pct": 3.71,
   "lowest_premium_pct": 2.92,
   "spread_pp": 1.56,
   "spot_avg": 4050.92
  }
 ],
 "dealers": [
  {
   "dealer": "kitco",
   "snapshots": 12,
   "coverage_pct": 2.3,
   "avg_premium_pct": 2.14,
   "avg_rank": 1,
   "vs_market_median_pp": -0.85,
   "times_cheapest": 12,
   "premium_volatility_pp": 0.04,
   "price_changes": 11,
   "dealer_name": "Kitco"
  },
  {
   "dealer": "hero",
   "snapshots": 328,
   "coverage_pct": 63.8,
   "avg_premium_pct": 2.43,
   "avg_rank": 1.33,
   "vs_market_median_pp": -0.54,
   "times_cheapest": 270,
   "premium_volatility_pp": 0.8,
   "price_changes": 32,
   "dealer_name": "Hero Bullion"
  },
  {
   "dealer": "summit",
   "snapshots": 428,
   "coverage_pct": 83.3,
   "avg_premium_pct": 2.82,
   "avg_rank": 1.86,
   "vs_market_median_pp": -0.16,
   "times_cheapest": 86,
   "premium_volatility_pp": 0.17,
   "price_changes": 261,
   "dealer_name": "Summit Metals"
  },
  {
   "dealer": "sdbullion",
   "snapshots": 509,
   "coverage_pct": 99.0,
   "avg_premium_pct": 2.97,
   "avg_rank": 2.23,
   "vs_market_median_pp": -0.12,
   "times_cheapest": 145,
   "premium_volatility_pp": 0.29,
   "price_changes": 142,
   "dealer_name": "SD Bullion"
  },
  {
   "dealer": "apmex",
   "snapshots": 513,
   "coverage_pct": 99.8,
   "avg_premium_pct": 4.58,
   "avg_rank": 3.46,
   "vs_market_median_pp": 1.48,
   "times_cheapest": 1,
   "premium_volatility_pp": 0.56,
   "price_changes": 342,
   "dealer_name": "APMEX"
  }
 ],
 "method": "Premium % = price / (spot x oz) - 1 with the spot recorded in the same snapshot. vs_market_median_pp = mean over snapshots of (dealer premium - median dealer premium in that snapshot). Daily values are the median across that day's snapshots (ET days). Rank 1 = lowest premium in a snapshot. Vs market median = a dealer's premium minus the median dealer premium in the same snapshot, averaged (negative = below the market). Volatility = population std dev of a dealer's premium % across snapshots (removes spot moves). No values are interpolated; days without snapshots are absent."
}