Cryptare API

Overview

The Cryptare API gives access to the data used by the Cryptare iOS App. The initial versions of the app used a lot of the same data provided by this API, however each user requested data individually. At the time it made sense because the app was essentially a side project for myself. There was also no need for storage of the data. As the app grew, and the number of users started increasing, new features required access to the history of exchange market prices. There were several reasons why I felt the need for this API:

• Majority of exchanges do not provide access to their history of market statistics. This API stores this data which is publicly available anyway.
• Each exchange has their own API with different rules. This API standardizes it and removes the learning curve for developers.
• Having each user of the app make a new request to the Exchange API naturally increases the load on the Exchange server. Instead, a scalable solution would be to make a single request to the Exchange API and serve the response data to all the users. This API fulfills this need.
• Because the database is a Firebase Real-time database, observers can be set up to listen for changes in the database in real-time. This is ideal for the cryptocurrency environment, which changes practically every second.

Design

The result of the API calls will return some or all of the following fields. This depends on the data provided by the exchange.

Field	Description
buy_price	Current buy (ask) price of the exchange
sell_price	Current sell (bid) price price of the exchange
max_24hrs	Highest price in the past 24 hours
min_24hrs	Lowest price in the past 24 hours
vol_24hrs or coin_volume_24hrs	Volume of coins transferred in the past 24 hours
vol_30days	Volume of coins transferred in the past 30 days
fiat_volume_24hrs	Amount of fiat money transferred in the past 24 hours
timestamp	UNIX format timestamp of data entry

Coindesk ("INR", "USD", "GBP", "JPY", "CNY", "SGD", "EUR", "ZAR")

Coindesk is used to get the current price

• Supported coins = ["BTC"]
• Supported currencies = ["INR", "USD", "GBP", "JPY", "CNY", "SGD", "EUR", "ZAR"]

Zebpay

URL: https://atalwcryptare.firebaseio.com/zebpay.json?print=pretty

• Supported coins = ["BTC"]
• Supported currencies = ["INR"].

"-L-SPfZ4ioSx2LLNxlIX" : {
"buy_price" : 841715.0,
"sell_price" : 824881.0,
"timestamp" : 1.512322021542984E9,
"vol_24hrs" : 781.32573379
}

Zebpay URL: https://api.zebpay.com/api/v1/ticker?currencyCode=INR

Coinsecure

URL: https://atalwcryptare.firebaseio.com/coinsecure.json?print=pretty

• Supported coins = ["BTC"]
• Supported currencies = ["INR"]

"-L-R_7BcPPxe8I9tmz-p" : {
"buy_price" : 849998.0,
"coin_volume_24hrs" : 21.211,
"fiat_volume_24hrs" : 1.779931356E7,
"max_24hrs" : 850000.0,
"min_24hrs" : 830000.0,
"sell_price" : 841599.0,
"timestamp" : 1.51230798052585E9
}

Coinsecure URL: https://api.coinsecure.in/v1/exchange/ticker

Koinex

URL: https://atalwcryptare.firebaseio.com/koinex_BTC_INR.json?print=pretty

Koinex supports several altcoins. In the URL, replace COIN in koinex_COIN_INR with any one of these ["BTC", "BCH", "ETH", "LTC", "XRP"]. For Example, https://atalwcryptare.firebaseio.com/koinex_LTC_INR.json

• Supported coins = ["BTC", "BCH", "ETH", "LTC", "XRP"]
• Supported currencies = ["INR"].

"-L-SQr7i_0b-0GLPjMO_" : {
"buy_price" : 855000.0,
"max_24hrs" : 862500.0,
"min_24hrs" : 770000.0,
"sell_price" : 853500.0,
"timestamp" : 1.512322331009709E9,
"vol_24hrs" : 124.644
}

Koinex URL: https://koinex.in/api/ticker

Throughbit

Pocketbits

URL: https://atalwcryptare.firebaseio.com/pocketbits.json?print=pretty

• Supported coins = ["BTC"]
• Supported currencies = ["INR"].

"-L-SPoFniEpq0B3yTGgT" : {
"buy_price" : 849742,
"sell_price" : 825349,
"timestamp" : 1.51232205719493E9
}

Pocketbits URL: https://www.pocketbits.in/Index/getBalanceRates

LocalBitcoins

URL: https://atalwcryptare.firebaseio.com/localbitcoins_BTC_INR.json?print=pretty

LocalBitcoins supports different currencies. In the URL, replace CURRENCY in localbitcoins_BTC_CURRENCY with any one of these ["INR", "USD", "GBP", "CNY", "SGD", "EUR", "ZAR"]. For Example, https://atalwcryptare.firebaseio.com/localbitcoins_BTC_SGD.json

• Supported coins = ["BTC"]
• Supported currencies = ["INR", "USD", "GBP", "CNY", "SGD", "EUR", "ZAR"].

"-L-SPh4qGi1b8_10t3Uc" : {
"buy_price" : 852800.0,
"sell_price" : 810500.0,
"timestamp" : 1.512322027783203E9,
"vol_24hrs" : 14.60155067
}

Localbitcoins URLs:

• Buy: https://localbitcoins.com/buy-bitcoins-online/{0}/.json
• Sell: https://localbitcoins.com/sell-bitcoins-online/{0}/c/bank-transfers/.json
• Volume: https://localbitcoins.com/bitcoinaverage/ticker-all-currencies/
• Replace {0} with the desired currency.

Coinbase

Example URL: https://atalwcryptare.firebaseio.com/coinbase_BTC_USD.json?print=pretty

General URL: https://atalwcryptare.firebaseio.com/coinbase_{0}_{1}.json where {0}= coin and {1}= currency.

• Supported coins = ["BTC", "ETH", "LTC"]
• Supported currencies = ["USD", "GBP", "EUR"]
• Note: Coinbase does not yet support GBP currency for ETH and LTC. (5 Dec, 2017)

"-L-Rx3Uxaz7JiUBVVHOU" : {
"buy_price" : "11913.25",
"max_24hrs" : 11795.0,
"min_24hrs" : 10762.0,
"sell_price" : "11677.34",
"timestamp" : 1.512314257803914E9,
"vol_24hrs" : 17214.74378967,
"vol_30days" : 770063.73086679
}

Coinbase URLs:

• Buy: https://api.coinbase.com/v2/prices/{0}-{1}/buy
• Sell: https://api.coinbase.com/v2/prices/{0}-{1}/sell
• Stats: https://api.gdax.com/products/{0}-{1}/stats
• Replace {0} and {1} with the desired coin and currency pair.

Kraken

Example URL: https://atalwcryptare.firebaseio.com/kraken_BTC_USD.json?print=pretty

General URL: https://atalwcryptare.firebaseio.com/kraken_{0}_{1}.json where {0}= coin and {1}= currency.

• Supported coins = ["BTC", "ETH", "LTC"]
• Supported currencies = ["USD", "GBP", "JPY", "CAD", "EUR"]
• Note: Kraken only supports ["USD", "EUR"] for LTC. (5 Dec, 2017)

"-L-aTXeq2CBrqCf1Ep9W" : {
"buy_price" : 11650.0,
"max_24hrs" : 11849.9,
"min_24hrs" : 11006.3,
"sell_price" : 11650.0,
"timestamp" : 1.512316383052561E9,
"vol_24hrs" : 3781.39453706
}

Kraken URL: https://api.kraken.com/0/public/Ticker?pair={0}{1} where {0}= coin and {1}= currency.

Note: Kraken uses XBT instead of BTC to denote Bitcoin.

Bitfinex

Example URL: https://atalwcryptare.firebaseio.com/bitfinex_BTC_USD.json?print=pretty

General URL: https://atalwcryptare.firebaseio.com/bitfinex_{0}_{1}.json where {0}= coin and {1}= currency.

• Supported coins = ["BTC", "ETH", "LTC", "BCH", "XRP"]
• Supported currencies = BTC has ["USD", "EUR"] values. All other coins only have ["USD"].

"-L-aY-Y4z8mq87TzvB4g" : {
"buy_price" : 11666.0,
"max_24hrs" : 11842.0,
"min_24hrs" : 10718.0,
"sell_price" : 11664.0,
"timestamp" : 1.512475199170982E9,
"vol_24hrs" : 58576.69881667
}

Bitfinex URL: https://api.bitfinex.com/v1/pubticker/{0}{1} where {0}= coin and {1}= currency.

Poloniex

Currently unsupported because Poloniex API access requires captcha verification.

Poloniex URL: https://poloniex.com/public?command=returnTicker

Gemini

Example URL: https://atalwcryptare.firebaseio.com/gemini_BTC_USD.json?print=pretty

General URL: https://atalwcryptare.firebaseio.com/gemini_{0}_{1}.json where {0}= coin and {1}= currency.

• Supported coins = ["BTC", "ETH"]
• Supported currencies = ["USD"]

"-L-aX1UZrGklkB4UHSPG" : {
"buy_price" : 11691.78,
"coin_volume_24hrs" : 7668.6324647363,
"fiat_volume_24hrs" : 8.793478945770213E7,
"sell_price" : 11691.77,
"timestamp" : 1.512474945323566E9
}

Gemini URL: https://api.gemini.com/v1/pubticker/{0}{1} where {0}= coin and {1}= currency.

Bitstamp

Example URL: https://atalwcryptare.firebaseio.com/bitstamp_BTC_USD.json?print=pretty

General URL: https://atalwcryptare.firebaseio.com/bitstamp_{0}_{1}.json where {0}= coin and {1}= currency.

• Supported coins = ["BTC", "ETH", "LTC", "XRP"]
• Supported currencies = ["USD", "EUR"]

"-L-SMU3d4YWpIp3ib080" : {
"buy_price" : 11671.99,
"max_24hrs" : 11800.01,
"min_24hrs" : 10770.32,
"sell_price" : 11661.01,
"timestamp" : 1.512321182378586E9,
"vol_24hrs" : 8015.99202548
}

Bitstamp URL: https://www.bitstamp.net/api/v2/ticker/{0}{1} where {0}= coin and {1}= currency.

Bittrex