{
 "schema_version": 1,
 "slug": "american-gold-buffalo-1oz",
 "name": "1 oz American Gold Buffalo",
 "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": 10,
   "median_premium_pct": 6.13,
   "lowest_premium_pct": 3.69,
   "spread_pp": 4.36,
   "spot_avg": 4153.22
  },
  {
   "date": "2026-10-16",
   "snapshots": 7,
   "dealers_quoted": 10,
   "median_premium_pct": 5.78,
   "lowest_premium_pct": 3.69,
   "spread_pp": 5.11,
   "spot_avg": 4171.87
  },
  {
   "date": "2026-10-17",
   "snapshots": 2,
   "dealers_quoted": 10,
   "median_premium_pct": 5.4,
   "lowest_premium_pct": 3.61,
   "spread_pp": 5.26,
   "spot_avg": 4166.1
  },
  {
   "date": "2026-10-18",
   "snapshots": 12,
   "dealers_quoted": 10,
   "median_premium_pct": 5.4,
   "lowest_premium_pct": 3.61,
   "spread_pp": 5.26,
   "spot_avg": 4171.55
  },
  {
   "date": "2026-10-19",
   "snapshots": 32,
   "dealers_quoted": 10,
   "median_premium_pct": 4.91,
   "lowest_premium_pct": 3.56,
   "spread_pp": 5.26,
   "spot_avg": 4145.9
  },
  {
   "date": "2026-10-20",
   "snapshots": 22,
   "dealers_quoted": 9,
   "median_premium_pct": 4.95,
   "lowest_premium_pct": 3.59,
   "spread_pp": 5.25,
   "spot_avg": 4127.37
  },
  {
   "date": "2026-10-21",
   "snapshots": 7,
   "dealers_quoted": 8,
   "median_premium_pct": 5.28,
   "lowest_premium_pct": 3.55,
   "spread_pp": 5.29,
   "spot_avg": 4138.13
  },
  {
   "date": "2026-10-22",
   "snapshots": 23,
   "dealers_quoted": 9,
   "median_premium_pct": 5.67,
   "lowest_premium_pct": 3.69,
   "spread_pp": 5.14,
   "spot_avg": 4042.99
  },
  {
   "date": "2026-10-23",
   "snapshots": 27,
   "dealers_quoted": 9,
   "median_premium_pct": 5.24,
   "lowest_premium_pct": 3.58,
   "spread_pp": 5.28,
   "spot_avg": 4007.26
  },
  {
   "date": "2026-10-24",
   "snapshots": 30,
   "dealers_quoted": 10,
   "median_premium_pct": 5.38,
   "lowest_premium_pct": 1.7,
   "spread_pp": 7.17,
   "spot_avg": 3996.9
  },
  {
   "date": "2026-10-25",
   "snapshots": 31,
   "dealers_quoted": 10,
   "median_premium_pct": 5.53,
   "lowest_premium_pct": 1.7,
   "spread_pp": 7.17,
   "spot_avg": 3997.18
  },
  {
   "date": "2026-10-26",
   "snapshots": 17,
   "dealers_quoted": 10,
   "median_premium_pct": 5.91,
   "lowest_premium_pct": 3.61,
   "spread_pp": 5.22,
   "spot_avg": 4017.14
  },
  {
   "date": "2026-10-27",
   "snapshots": 7,
   "dealers_quoted": 9,
   "median_premium_pct": 5.91,
   "lowest_premium_pct": 3.67,
   "spread_pp": 5.07,
   "spot_avg": 4043.96
  },
  {
   "date": "2026-10-28",
   "snapshots": 2,
   "dealers_quoted": 9,
   "median_premium_pct": 5.94,
   "lowest_premium_pct": 3.64,
   "spread_pp": 4.58,
   "spot_avg": 4052.05
  },
  {
   "date": "2026-10-29",
   "snapshots": 18,
   "dealers_quoted": 9,
   "median_premium_pct": 5.93,
   "lowest_premium_pct": 3.7,
   "spread_pp": 5.07,
   "spot_avg": 4017.09
  },
  {
   "date": "2026-10-30",
   "snapshots": 25,
   "dealers_quoted": 9,
   "median_premium_pct": 6.09,
   "lowest_premium_pct": 3.83,
   "spread_pp": 4.62,
   "spot_avg": 3912.33
  },
  {
   "date": "2026-10-31",
   "snapshots": 24,
   "dealers_quoted": 9,
   "median_premium_pct": 6.86,
   "lowest_premium_pct": 3.88,
   "spread_pp": 4.62,
   "spot_avg": 3876.4
  },
  {
   "date": "2026-11-01",
   "snapshots": 22,
   "dealers_quoted": 9,
   "median_premium_pct": 6.86,
   "lowest_premium_pct": 3.88,
   "spread_pp": 4.62,
   "spot_avg": 3884.73
  },
  {
   "date": "2026-11-02",
   "snapshots": 7,
   "dealers_quoted": 9,
   "median_premium_pct": 6.38,
   "lowest_premium_pct": 3.58,
   "spread_pp": 4.89,
   "spot_avg": 3944.43
  },
  {
   "date": "2026-11-04",
   "snapshots": 20,
   "dealers_quoted": 8,
   "median_premium_pct": 6.42,
   "lowest_premium_pct": 3.66,
   "spread_pp": 4.61,
   "spot_avg": 4069.98
  },
  {
   "date": "2026-11-05",
   "snapshots": 19,
   "dealers_quoted": 7,
   "median_premium_pct": 6.31,
   "lowest_premium_pct": 3.64,
   "spread_pp": 4.55,
   "spot_avg": 4095.28
  },
  {
   "date": "2026-11-06",
   "snapshots": 23,
   "dealers_quoted": 8,
   "median_premium_pct": 6.31,
   "lowest_premium_pct": 3.6,
   "spread_pp": 4.69,
   "spot_avg": 4067.41
  },
  {
   "date": "2026-11-07",
   "snapshots": 19,
   "dealers_quoted": 8,
   "median_premium_pct": 6.52,
   "lowest_premium_pct": 1.68,
   "spread_pp": 6.62,
   "spot_avg": 4072.1
  },
  {
   "date": "2026-11-08",
   "snapshots": 21,
   "dealers_quoted": 7,
   "median_premium_pct": 6.57,
   "lowest_premium_pct": 3.67,
   "spread_pp": 4.63,
   "spot_avg": 4084.34
  },
  {
   "date": "2026-11-09",
   "snapshots": 27,
   "dealers_quoted": 7,
   "median_premium_pct": 6.56,
   "lowest_premium_pct": 3.62,
   "spread_pp": 4.55,
   "spot_avg": 4120.56
  },
  {
   "date": "2026-11-10",
   "snapshots": 37,
   "dealers_quoted": 9,
   "median_premium_pct": 6.71,
   "lowest_premium_pct": 3.66,
   "spread_pp": 4.61,
   "spot_avg": 4055.1
  },
  {
   "date": "2026-11-11",
   "snapshots": 13,
   "dealers_quoted": 9,
   "median_premium_pct": 6.7,
   "lowest_premium_pct": 3.65,
   "spread_pp": 4.59,
   "spot_avg": 4050.92
  }
 ],
 "dealers": [
  {
   "dealer": "mintbuilder",
   "snapshots": 501,
   "coverage_pct": 97.5,
   "avg_premium_pct": 3.69,
   "avg_rank": 1.29,
   "vs_market_median_pp": -2.3,
   "times_cheapest": 367,
   "premium_volatility_pp": 0.13,
   "price_changes": 277,
   "dealer_name": "MintBuilder"
  },
  {
   "dealer": "monument",
   "snapshots": 501,
   "coverage_pct": 97.5,
   "avg_premium_pct": 4.87,
   "avg_rank": 2.64,
   "vs_market_median_pp": -1.12,
   "times_cheapest": 2,
   "premium_volatility_pp": 0.53,
   "price_changes": 329,
   "dealer_name": "Monument Metals"
  },
  {
   "dealer": "hero",
   "snapshots": 226,
   "coverage_pct": 44.0,
   "avg_premium_pct": 3.61,
   "avg_rank": 3.06,
   "vs_market_median_pp": -1.81,
   "times_cheapest": 97,
   "premium_volatility_pp": 1.77,
   "price_changes": 24,
   "dealer_name": "Hero Bullion"
  },
  {
   "dealer": "agate",
   "snapshots": 480,
   "coverage_pct": 93.4,
   "avg_premium_pct": 5.66,
   "avg_rank": 3.96,
   "vs_market_median_pp": -0.35,
   "times_cheapest": 44,
   "premium_volatility_pp": 1.98,
   "price_changes": 125,
   "dealer_name": "Agate Metals"
  },
  {
   "dealer": "bullionstandard",
   "snapshots": 502,
   "coverage_pct": 97.7,
   "avg_premium_pct": 5.71,
   "avg_rank": 4.04,
   "vs_market_median_pp": -0.28,
   "times_cheapest": 0,
   "premium_volatility_pp": 0.73,
   "price_changes": 334,
   "dealer_name": "Bullion Standard"
  },
  {
   "dealer": "summit",
   "snapshots": 502,
   "coverage_pct": 97.7,
   "avg_premium_pct": 6.12,
   "avg_rank": 4.87,
   "vs_market_median_pp": 0.13,
   "times_cheapest": 0,
   "premium_volatility_pp": 0.32,
   "price_changes": 330,
   "dealer_name": "Summit Metals"
  },
  {
   "dealer": "sdbullion",
   "snapshots": 367,
   "coverage_pct": 71.4,
   "avg_premium_pct": 6.33,
   "avg_rank": 6.27,
   "vs_market_median_pp": 0.52,
   "times_cheapest": 4,
   "premium_volatility_pp": 0.59,
   "price_changes": 96,
   "dealer_name": "SD Bullion"
  },
  {
   "dealer": "kitco",
   "snapshots": 56,
   "coverage_pct": 10.9,
   "avg_premium_pct": 6.44,
   "avg_rank": 6.73,
   "vs_market_median_pp": 0.68,
   "times_cheapest": 0,
   "premium_volatility_pp": 0.39,
   "price_changes": 44,
   "dealer_name": "Kitco"
  },
  {
   "dealer": "atcost",
   "snapshots": 168,
   "coverage_pct": 32.7,
   "avg_premium_pct": 6.67,
   "avg_rank": 6.86,
   "vs_market_median_pp": 0.57,
   "times_cheapest": 0,
   "premium_volatility_pp": 0.22,
   "price_changes": 80,
   "dealer_name": "At Cost Metals"
  },
  {
   "dealer": "goldeneagle",
   "snapshots": 502,
   "coverage_pct": 97.7,
   "avg_premium_pct": 8.29,
   "avg_rank": 7.63,
   "vs_market_median_pp": 2.29,
   "times_cheapest": 0,
   "premium_volatility_pp": 0.51,
   "price_changes": 337,
   "dealer_name": "Golden Eagle Coins"
  },
  {
   "dealer": "apmex",
   "snapshots": 512,
   "coverage_pct": 99.6,
   "avg_premium_pct": 8.23,
   "avg_rank": 7.81,
   "vs_market_median_pp": 2.23,
   "times_cheapest": 0,
   "premium_volatility_pp": 0.19,
   "price_changes": 347,
   "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."
}