Author Topic: Price Feed Review  (Read 10727 times)

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Online bitcrab

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Price Feed Review
« on: May 09, 2019, 04:59:06 am »
This thread is to replace https://bitsharestalk.org/index.php?topic=28265.0

Feed Price is so important that we need some mechanism to review/audit it.

If anyone in BTS community find that some witnesses do bad in price feeding, please provide proof here to show to all, voters should also get information from thread and decide to support or not support which witnesses.

In bitCNY price feed, I'd like to emphasize one principle,which get strong consensus from China community: the price feed should not conflict with the DEX price plus an bitCNY premium/discount offset.

 
« Last Edit: May 09, 2019, 05:29:52 am by bitcrab »

Offline finn-bts

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Re: Price Feed Review
« Reply #1 on: May 09, 2019, 05:10:01 am »
bangzi 0.3372  clockwork 0.3399 roelandp 0.3402 fox 0.3453  zapata42-witness 0.3462 delegate-1.lafona0.3475
The price offered by these witnesses is far below the real price

Online bitcrab

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Re: Price Feed Review
« Reply #2 on: May 09, 2019, 05:11:40 am »
CNY price feed review:
time: UTC 9th May 5:01

BTS price calculated from DEX price and bitCNY premium/discount:0.35061*[1+(2.65%+1.91%)/2) = 0.3586





Warn: bangzi, clockwork, roelandp feed a price which is 5.4%+ lower than the reasonable price at the time, please review your feeding scripts.
« Last Edit: May 09, 2019, 05:26:40 am by bitcrab »

Online sschiessl

Re: Price Feed Review
« Reply #3 on: May 09, 2019, 07:13:01 am »
bangzi 0.3372  clockwork 0.3399 roelandp 0.3402 fox 0.3453  zapata42-witness 0.3462 delegate-1.lafona0.3475
The price offered by these witnesses is far below the real price

Please provide a proper overview of market conditions at the time of your posting. Without that, your numbers are meaningless.

Online zhouxiaobao

Re: Price Feed Review
« Reply #4 on: May 09, 2019, 07:42:40 am »
This kind of witness who intentionally provides low feed  price is the devil.

Offline Bangzi

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Re: Price Feed Review
« Reply #5 on: May 09, 2019, 07:45:04 am »
Fixed. High volume but huge spread in CoinEgg causing huge different in witnesses' price feed.

Compare trading price/volume at different exchanges:


Orderbook in CoinEgg:
Please Vote for My Witness: Bangzi
请投票支持比特股见证人: Bangzi
Witness Update: https://bitsharestalk.org/index.php?topic=26459.0

Online binggo

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Re: Price Feed Review
« Reply #6 on: May 09, 2019, 07:59:48 am »

CoinEgg?WTF? nobody use it, all is fake in coinegg.

Did you believe it? what are you thinking?

« Last Edit: May 09, 2019, 08:01:40 am by binggo »

Offline ljk424

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Re: Price Feed Review
« Reply #7 on: May 09, 2019, 08:09:59 am »
Fixed. High volume but huge spread in CoinEgg causing huge different in witnesses' price feed.

Compare trading price/volume at different exchanges:


Orderbook in CoinEgg:

coinegg?are you  kidding us?

Online bitcrab

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Re: Price Feed Review
« Reply #8 on: May 09, 2019, 10:49:58 am »
Fixed. High volume but huge spread in CoinEgg causing huge different in witnesses' price feed.

Compare trading price/volume at different exchanges:


Orderbook in CoinEgg:


this remind us that it's important to filter out the data which is inconsistent with real market, "the price feed should not conflict with the DEX price plus an bitCNY premium/discount offset" can be a good reference in judging the data from CEXs.

Online bitcrab

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Re: Price Feed Review
« Reply #9 on: May 09, 2019, 11:38:43 am »
Time: UTC 9th May, 19:30

at the time in in huobi BTS price is 0.0507 USDT, USDT OTC price is 6.85 CNY fiat, then 1USDT = 1.004USD, 1BTS = 0.0509USD
this value is consistent to DEX price.






Warning: xeldal feed a price of 0.0496USD, 2.6%+ lower than the reasonable price, please review your price feeding script.
« Last Edit: May 09, 2019, 11:47:53 am by bitcrab »

Online bitcrab

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Re: Price Feed Review
« Reply #10 on: May 09, 2019, 12:18:23 pm »
Time: UTC 9th May 12:15





Warning:delegate-1.lafona, sahkan-bitshares, witness-hiblockchain, zapata42-witness, xeldal at the time feed a 2%+ lower price than reasonable.
« Last Edit: May 09, 2019, 12:22:09 pm by bitcrab »

Offline xeroc

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Re: Price Feed Review
« Reply #11 on: May 09, 2019, 12:32:41 pm »
While we are at it, I started working on a python project that is supposed to automatically disapprove (unvote) witnesses that provide inaccurate feeds (relative to price feed) here:

https://github.com/xeroc/witness-monitor

Any development resources to improve that would be welcome.
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Online bitcrab

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Re: Price Feed Review
« Reply #12 on: May 09, 2019, 01:47:50 pm »
While we are at it, I started working on a python project that is supposed to automatically disapprove (unvote) witnesses that provide inaccurate feeds (relative to price feed) here:

https://github.com/xeroc/witness-monitor

Any development resources to improve that would be welcome.

that's great.

I also would like to have one tool to provide convenience to voters to estimate witnesses' work.

say, integrate all the price feed data from each witness to a candle chart, with modified DEX price, that will also help a lot.

Offline yamtt

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Re: Price Feed Review
« Reply #13 on: May 09, 2019, 02:43:53 pm »
Please tell me @clockwork This is not the first time.

« Last Edit: May 09, 2019, 02:45:53 pm by yamtt »

Offline ioex

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Re: Price Feed Review
« Reply #14 on: May 09, 2019, 04:53:00 pm »
Please tell me @clockwork This is not the first time.


@clockwork this guy is also a Committee,please unvote this bad guy!