{
  "name": "Coinbase Exchange BTC-USD monthly opening price sample, 2024",
  "source": "Coinbase Exchange public candles API",
  "documentation": "https://docs.cdp.coinbase.com/api-reference/exchange-api/rest-api/products/get-product-candles",
  "retrievedAt": "2026-09-05",
  "product": "BTC-USD",
  "currency": "USD",
  "granularitySeconds": 86400,
  "priceField": "open (index 3 of each returned candle)",
  "method": "First trade of the UTC daily bucket on the first day of each month. The calculator buys and values holdings at that opening price. Final valuation is December 1, not December 31.",
  "requestTemplate": "https://api.exchange.coinbase.com/products/BTC-USD/candles?granularity=86400&start=YYYY-MM-01T00:00:00Z&end=YYYY-MM-02T00:00:00Z",
  "candleFields": ["timestamp", "low", "high", "open", "close", "volume"],
  "observations": [
    {"date":"2024-01-01T00:00:00Z","price":42288.58,"candle":[1704067200,42175.65,44240.8,42288.58,44220.78,7977.72851143]},
    {"date":"2024-02-01T00:00:00Z","price":42545.47,"candle":[1706745600,41846.04,43276.19,42545.47,43078.81,11526.63383073]},
    {"date":"2024-03-01T00:00:00Z","price":61179.03,"candle":[1709251200,60788.33,63267.18,61179.03,62436.72,24696.65692545]},
    {"date":"2024-04-01T00:00:00Z","price":71291.5,"candle":[1711929600,68055.15,71313.8,71291.5,69681.82,13916.60016523]},
    {"date":"2024-05-01T00:00:00Z","price":60621.2,"candle":[1714521600,56500,60785.49,60621.2,58265.59,26611.9312734]},
    {"date":"2024-06-01T00:00:00Z","price":67473.07,"candle":[1717200000,67371.28,67837.33,67473.07,67719.29,1949.57008052]},
    {"date":"2024-07-01T00:00:00Z","price":62669.14,"candle":[1719792000,62448.46,63801.26,62669.14,62830.13,12326.70696465]},
    {"date":"2024-08-01T00:00:00Z","price":64609.61,"candle":[1722470400,62212.81,65593.56,64609.61,65288.18,15636.72205775]},
    {"date":"2024-09-01T00:00:00Z","price":58968.37,"candle":[1725148800,57200,59070.55,58968.37,57299,4411.05388122]},
    {"date":"2024-10-01T00:00:00Z","price":63305.52,"candle":[1727740800,60150.89,64106.75,63305.52,60790,15970.80295516]},
    {"date":"2024-11-01T00:00:00Z","price":70198.02,"candle":[1730419200,68720,71620,70198.02,69467.29,15295.28781188]},
    {"date":"2024-12-01T00:00:00Z","price":96464.95,"candle":[1733011200,95753.42,97895.9,96464.95,97263.18,4039.27591451]}
  ]
}