Coinbase BTC history (candles) seems wrong to me

DannyHamilton

legendary

Activity: 3388

Merit: 4615

Quote from: Anti-Cen on December 14, 2017, 11:49:23 AM

Not sure how you got the chart but it does not look like this one that shows top at about $16,500
https://bitcoincharts.com/charts/bitstampUSD#rg60ztgSzm1g10zm2g25zv

Your link says bitstampUSD.

You were complaining about Coinbase, so in the "Symbol" drop down on that website I selected GDAX.

Bitstamp never moved as much as Coinbase did on that date, therefore my GDAX chart looks different than your BitStamp chart (as expected).

Quote from: Anti-Cen on December 14, 2017, 11:49:23 AM

See https://api.gdax.com/products/BTC-USD/candles?start=2017-12-07&end=2017-12-08&granularity=200
I cannot see $19,xxx in the data for the 7th or 8th

I just ran that exact API call (copied and pasted from your post). I DO see $19,xxx in the data

I'll add some spaces in the data to isolate the values so you can see them better:

Code:

[1512664200,17900,18300,18200.99,18014.87,129.22107235999997],
[1512664000,18028.41, 19697 , 19100 ,18200.99,740.969024269999],
[1512663800,18182.17, 19697 ,18299.93, 19187.98 ,902.6553972399992],
[1512663600,17639.94,18775,17639.95,18299.92,1077.2144500899974]

In the row identified with time bucket start time of 1512664000
I see high=19697 and open=19100

In the row identified with time bucket start time of 1512663800
I see high=19697 and close=19187

kahc

member

Activity: 350

Merit: 13

Quote from: Anti-Cen on December 14, 2017, 11:49:23 AM

Quote from: DannyHamilton on December 14, 2017, 11:11:02 AM

https://i.imgur.com/s6v2Ux3.png
https://i.imgur.com/s6v2Ux3.png

Yes something like that spike
See https://api.gdax.com/products/BTC-USD/candles?start=2017-12-07&end=2017-12-08&granularity=200

Data comes back in this format
time bucket start time
low lowest price during the bucket interval
high highest price during the bucket interval
open opening price (first trade) in the bucket interval
close closing price (last trade) in the bucket interval
volume volume of trading activity during the bucket interval

I cannot see $19,xxx in the data for the 7th or 8th
See https://www.coindesk.com/price/ and set the start date to 7th and it peaks at about $17k

I used https://api.gdax.com/products/BTC-USD/candles?start=2017-12-07T15:00:00.00000Z&end=2017-12-07T18:00:00.00000Z&granularity=3600

Returned this
[
[1512666000,15100,17294.99,16260.01,16774.97,5318.374422080226],
[1512662400,15101,19697,16949,16299.99,9396.517037170646],
[1512658800,16140.01,16977,16140.02,16949,6425.73311753051]
]

Different exchanges will always have different high and low values over the same time periods.
I don't know if Coindesk use their own data or pull data from somewhere else.

Anti-Cen

member

Activity: 210

Merit: 26

High fees = low BTC price

Quote from: DannyHamilton on December 14, 2017, 11:11:02 AM

https://i.imgur.com/s6v2Ux3.png

Yes something like that spike but it was a little wider and was in the 19k's for about an hour
See https://api.gdax.com/products/BTC-USD/candles?start=2017-12-07&end=2017-12-08&granularity=200

Data comes back in this format
time bucket start time
low lowest price during the bucket interval
high highest price during the bucket interval
open opening price (first trade) in the bucket interval
close closing price (last trade) in the bucket interval
volume volume of trading activity during the bucket interval

I cannot see $19,xxx in the data for the 7th or 8th
See https://www.coindesk.com/price/ and set the start date to 7th and it peaks at about $17k

Not sure how you got the chart but it does not look like this one that shows top at about $16,500
https://bitcoincharts.com/charts/bitstampUSD#rg60ztgSzm1g10zm2g25zv

DannyHamilton

legendary

Activity: 3388

Merit: 4615

I've been watching the price at GDAX and Coinbase pretty closely for the past few weeks. I've got a bet with some family members on how long it will take the price to double from $10,000 (the high price when the bet was made on Nov. 28).

This GMT chart from https://bitcoincharts.com matches closely with what I recall of the recent price history. Perhaps there's a small inaccuracy in your memory? Are you sure it was late Friday night, and not early Thursday evening that you were watching it?

Notice that Friday night the price spent all the time near midnight between $15500 and $16500. Are you suggesting that there was an sudden momentary spike from $16500 all the way up to $19,340 immediately followed by a drop back to $16500 all within 5 minutes without any noticeable effects before or after? (See the price around 6pm on the 7th? That oscillation is what you typically see after such a spike.) Or are you suggesting that hours of data between 23:00 and 02:00 were all manipulated to smooth out and hide such a spike? If that much data were manipulated so significantly, I'm pretty sure there'd be a lot more people noticing it than just you.

Anti-Cen

member

Activity: 210

Merit: 26

High fees = low BTC price

Quote from: kahc on December 13, 2017, 02:15:14 PM

Thats indeed weird.
The only time I can see BTC went above $19000 on GDAX was on 07.12.17 between 4PM - 6PM.
Did you fetch the data with api?

Our times will not be the same because I am on GMT here in the UK but i am sure it was the 8th at close to midnight my time and i was waiting to see
if the price hit $20,000 but it started to go down again at about 00:30 on the 9th

I scan read the data from the GDAX api for that date and also did a search for ",19" in the JSON and did not get a match so I am not sure what is going
on and because most of the charts show a peak of about $18,000 then people think I am barmy but i know what I saw but i will test again using the 7th
just to make sure

The price in South Korea I am told was about $23,000 at this stage but i am not quite sure why they pay much more than we have to pay for a coin

kahc

member

Activity: 350

Merit: 13

Quote from: Anti-Cen on December 13, 2017, 10:10:53 AM

I want to build a calculator that will provide a conversion from BTC to USD because 0.001 of a BTC means nothing to to me
and i want to be able to enter a date and get the ticker price for BTC on that date/time

Trouble is that I know that at about 00:20 on the 9th Dec 2017 that the market was showing BTC at $19,340 and this peak has been
taken out of most of the charts and I need historical data that is accurate for my calculator

I can get the data from gdax.com that lists candles and talks about buckets but i am not quite sure what these are and in
any case none of the data shows the BTC price going above $19,000 so whats the deal because it seems like someone is cooking the
book at Coinbase because they own GDAX to me.

Yes i know that i could talk to BTC nodes using port 8333 to get information on blocks but the BTC protocol
seems so bloated that it would take me a week just to write some code to ask for the time of day so that is
not an option in this case.

Thats indeed weird.
The only time I can see BTC went above $19000 on GDAX was on 07.12.17 between 4PM - 6PM.
Did you fetch the data with api?

Anti-Cen

member

Activity: 210

Merit: 26

High fees = low BTC price

I want to build a calculator that will provide a conversion from BTC to USD because 0.001 of a BTC means nothing to to me
and i want to be able to enter a date and get the ticker price for BTC on that date/time

Trouble is that I know that at about 00:20 on the 9th Dec 2017 that the market was showing BTC at $19,340 and this peak has been
taken out of most of the charts and I need historical data that is accurate for my calculator

I can get the data from gdax.com that lists candles and talks about buckets but i am not quite sure what these are and in
any case none of the data shows the BTC price going above $19,000 so whats the deal because it seems like someone is cooking the
book at Coinbase because they own GDAX to me.

Yes i know that i could talk to BTC nodes using port 8333 to get information on blocks but the BTC protocol
seems so bloated that it would take me a week just to write some code to ask for the time of day so that is
not an option in this case.

Topic: Coinbase BTC history (candles) seems wrong to me (Read 165 times)