- Bitcoin futures
- Bitcoin spot data
- Altcoin market data
- Bitcoin futures data
Futures premium data on OKCoin
Updated hourly, free public JSON. There is a parsed version without redundant data that is compatible with Google’s free charting library, see the spline chart here.
Google charts compatible JSON: https://bitcoinfutures.info/data/premium.json
Then there is a full backup of all collected data since April 2016: It is available on firebase https://intense-inferno-1622.firebaseio.com/premium.json, the same data should be also available here: http://backtesting.bitcoinfutures.info/premium.json. Getting the data off firebase should be more stable. You will have to sanitize them, there is a huge overlap between the months.
The datasets are updated hourly.
Bitcoin spot market data
Coin Market Cap API
Bitcoin and altcoins ticker and stats API. Available via https, updated minutely (?). It’s public JSON, easily parsed. API is well documented: http://coinmarketcap.com/api/
It’s pretty cool for simple website widgets.
Altcoin markets data
Poloniex LAST price + percent change, ticker
No access limit
JSON public endpoint
For separate coin pair tickets see URIs at http://api.altcoinwisdom.com/.
Also as HTML widget: black letters on white or white letters on transparent background
Data for sentiment analysis
Reddit /r/bitcoinmarkets daily thread top level comments
JSON public endpoint (normally, Reddit requires authorization and limits all bots and scripts)
Reddit selftext posts mentioning bitcoin exchanges
JSON public endpoint (might be off or late at times)
… you get the system