17
votes
Anyone know of an API I can get historical price time series for multiple coins
I am developing the ccxt cryptocurrency trading library, check it out on GitHub:
https://github.com/kroitor/ccxt
It is a library for cryptocurrency trading and e-commerce with support for many ...
- 428
17
votes
Accepted
Where is the BTC price "stored"?
There is no "the" BTC price.
There are exchanges, where people offer to sell and buy BTC for USD and other currencies, at certain prices. Those exchanges generally report the last price at ...
- 102k
15
votes
Accepted
How do I get bitcoin price without any external source?
The bitcoin price is determined by a free market of buyers and sellers. There is no way to calculate the price on your own without an external source. I suppose the only exception to this would be if ...
- 5,596
14
votes
Why does my bitcoin "to US dollar" worth change when the stock market is closed?
To my knowledge, bitcoin is not traded on any stock markets. It is traded directly on exchanges specialized in cryptocurrencies. These exchanges don't necessarily close, and therefore trades are ...
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12
votes
Why does my bitcoin "to US dollar" worth change when the stock market is closed?
Bitcoin is not a stock. It's a decentralized currency and its markets are open 24/7.
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9
votes
How do I get bitcoin price without any external source?
You may be thinking with cause and effect reversed. The Bitcoin price being $300 does not cause people to buy and sell at $300. Rather, people buying and selling at $300 causes the price to be $300.
...
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9
votes
Generating a Bitcoin Address QR code with current USD price embedded?
You can't include the USD amount, but you certainly can include the btc amount in the QR code. The QR code essentially embeds a text like this:
bitcoin:1ArmoryXcfq7TnCSuZa9fQjRYwJ4bkRKfv?amount=0.005
...
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8
votes
Do I have to buy a full bitcoin to get the price increase?
If you have 0.1 BTC and the Bitcoin price is $10,000, it is worth $1000.
If the Bitcoin price becomes $20,000 you will still have 0.1 BTC but it will be worth $2000.
- 3,649
7
votes
Where can I get all historical trades BTC price data?
You might want to try http://www.cryptodatasets.com/
It has free raw data and sampled data from Bitfinex and HitBtc (currently).
P.S. it's my website
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7
votes
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Anyone know of an API I can get historical price time series for multiple coins
Found the data on crypto compare
const endpoint = 'https://min-api.cryptocompare.com/data/histoday?aggregate=1&e=CCCAGG&extraParams=CryptoCompare&fsym='+ ticker.toUpperCase() +'&limit=...
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5
votes
How does bitcoin conversion (to/from $) handle round off error?
The Bitcoin protocol doesn't recognize the concept of a dollar. Conversions of the kind you mention do not exist in the Bitcoin protocol.
Conversions might exist with services that recognize dollars (...
- 19.7k
5
votes
Anyone know of an API I can get historical price time series for multiple coins
http://www.cryptocoincharts.info
Advance API to more than 100 exchanges: cryptocurrency pricing, OHLC and volume data from multiple exchanges.
BTC38, BTCC, BTER, Bit2C, Bitfinex, Bitstamp, Bittrex, ...
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5
votes
How do exchanges keep relatively similar price on coins?
If I could buy a bitcoin on Exchange A for $2,000, turn around and immediately sell it on Exchange B for $2,500, and make an immediate profit of $500, I would do that all day long, and get rich!
But ...
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4
votes
Accepted
How much will one bitcoin cost when the 21 millionth bitcoin (the last one) is mined?
Nobody knows. It depends on what the demand is for Bitcoins by that time. If everything goes as planned, the last bitcoin will be mined about 125 years from now, and I don't think anyone has a good ...
- 23k
3
votes
How do I purchase Bitcoins?
A complex subject with an array of different possibilities results in answers of the same nature. If we provide simple answers, it won't be very helpful. For example:
Q: How do I purchase bitcoins?
A:...
- 5,596
3
votes
Halving reward, price effects?
Will Bitcoin switch to a faster block rhythm?
No, the Blockchain will not change the number of blocks produced. That would require the difficulty retargeting rules to be changed, but the difficulty ...
- 72.6k
3
votes
Digital currencies pegged to dollar value
NuBits is really interesting in how it pegs to the USD, which they explain in the white paper. I'm guessing you don't want to go hunting through there (white papers can be ... daunting), so the short ...
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3
votes
Where can I get all historical trades BTC price data?
You can also use their JSON API:
http://bitcoincharts.com/about/markets-api/ to get updates to your already downloaded historical data.
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3
votes
Need authoritative source for historic Bitcoin conversion prices from all exchanges
Many API endpoints included OHLC data from various exchanges can be found on
cryptowatch
cryptocompare
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3
votes
Accepted
Is there a calculation for exchange rate stability?
This site can help you calculate the beta of Bitcoin:
https://btcvol.info/
"What definition of volatility does btcvol.info use?
The standard deviation of daily returns for the preceding 30- and 60-...
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3
votes
Accepted
How can a X-coin market cap go down while its value goes up?
As Nate Eldredge pointed out, the chart you're looking at is denominated in BTC, while the market cap is denominated in USD.
If you look at the chart below, you'll see that the price in USD (green) ...
- 72.6k
3
votes
Accepted
Are price movements of Bitcoin and altcoins inversely coupled?
The idea that bitcoin rising leads to altcoins falling is an unproven hypothesis, it is something that traders have noticed, but due to the various flaws in human observation, we cannot say for ...
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3
votes
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Electrum shows "No FX rate available" and balances show "No Data" and last transaction doesn't appear
I've just had this problem as well. It looks like Electrum gets its currency information by default from the BitcoinAverage website. You could try to select a different source of information. Try and ...
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3
votes
Can an altcoin be worth less than 1 satoshi (0.00000001 BTC)?
Can an altcoin be worth less than 1 satoshi (0.00000001 BTC)?
Yes
Is this a reasonable position?
No
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3
votes
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How Do I Calculate the profit of the value of my bitcoin?
The simplest way to calculate would be:
averagecost = ((BTC[t0] x USD[t0]) + (BTC[t1] x USD[t1]) + (so on))/total_BTC
where t0,t1 and so on are different time when you bought.
The above gives you ...
- 1,093
3
votes
do you think bitcoin futures exchanges (CBOE/CME) are a positive or negative for bitcoin price and why?
I do not consider the Futures Exchanges to be a good thing.
I don't trust large institutional traders. They can and will manipulate prices in their favor. I believe they are currently running up ...
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3
votes
BTC/USD price changes approximately the same way over many exchanges at the same time, how?
To be more specific about the "arbitrage strategies" in Tanmay's answer:
Suppose there were a difference in price between two exchanges: at A the price is $10,000 and at B it is $10,100. Then, in ...
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3
votes
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What would happen when everybody decides to convert their BTC to cash?
In order for you to sell your BTC for fiat cash, another trader needs to be on the other end of that deal and be willing to buy your BTC in exchange for their fiat cash.
So as long as someone is ...
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3
votes
Accepted
How are crypto prices calculated by an exchange? Example game in a spreadsheet to illustrate
Exchanges don't calculate prices, they report them. They aggregate people who want to sell and people who want to buy and report the prices they are willing to buy and sell for. When one person is ...
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2
votes
Where can I get historic data series of Bitcoin prices?
You might want to try http://www.cryptodatasets.com/ It has free raw(every trade by trade) data and sampled data from Bitfinex and HitBtc (non from MtGox since its not operating anymore).
P.S. it's ...
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