Problematic Crypto data

     - download speed improved

     - data looks good

bitfinex

   - download speed improved

   - but data is full of gaps - ibitfinex API offers data with gaps

for the screenshot - there are visible gaps - I tried call bitfinex API manually:

https://api.bitfinex.com/v2/candles/trade:1m:tBTCUSD/hist?limit=5000&sort=1&start=1364774400

This are records which I got:

1364774820000 = 1. April 2013 0:07:00

1364774880000 =  1. April 2013 0:08:00

1364774940000 = 1. April 2013 0:09:00

GAP

1364775060000 = 1. April 2013 0:11:00

1364775120000 = 1. April 2013 0:12:00

1364775180000 = 1. April 2013 0:13:00

GAPS.......

1364775960000 = 1. April 2013 0:26:00

It matches with the screenshot. Unfortunatelly, this is not a bug in application, API contains data with gaps

poloniex 

  - download speed was not necessary to improve, it was ok

  - data is full of gap:

https://poloniex.com/public?command=returnChartData&currencyPair=BTC_ETH&period=300&resolution=auto&start=0

1439006400 = 8. August 2015 4:00:00

1439020800 = 8. August 2015 8:00:00

returns one candle per 4hr period. As I'm playing with this - it looks, that they have data in 4hr timeframe, M5/M15/M30/H2  returns always data in H4 timeframe.

coinbase pro 

 - download is very slow - must be improved

 - data is full of gap  - there is a bug in coinbase api :-) which causes one gap per 300 candles - I implemented workaround

there are still gaps, checking gap at: 2021.12.11 08:06:00, 2021.12.11 09:53:00

calling:

https://api.pro.coinbase.com/products/ETH-BTC/candles?granularity=60&start=2021-12-11T08:05:00Z&end=2021-12-11T10:00:00Z

1639209900 - 11. December 2021 8:05:00

---missing 08:06:00

1639210020 - 11. December 2021 8:07:00

----------------

1639216320 - 11. December 2021 9:52:00

--missing 9:53:00

1639216440 - 11. December 2021 9:54:00

cause of the gaps is coinbase, its rest api doesn't return all data