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I am writing a trading bot and concerned about rate limits.
I need realtime notifications for change in price either like a PUSH api service.
Bitfinex appears to be the only major exchange that offers PUSH notifications, so I am not concerned with Bitfinex. But all other major exchanges such as Kraken are of concern.
How can I get realtime ticker data for the major bitcoin exchanges?
Poloniex has a PUSH API, check their API FAQ here: https://poloniex.com/support/api/
The other API requests they have said to have 6 request/sec rate limitation, which in my opinion is still pretty close to real-time if you update the Ticker this way.
Kraken does not provide PUSH API, from their FAQ it looks like a normal user (Tier 2) has a limitation on ticker of 1 request per 3 seconds (0.33 request/sec), but will be blocked for 15 minutes when exceeded.
Coinbase has only a PULL API with a 10,000 request per hour (2.7 request/sec) based on their Developer guide, although they operate a separate business called GDAX which has a WebSocket based real-time API.
Check out 1Forge, they provide a free JSON API for several cryptocurrencies (Bitcoin, Etherium, LiteCoin, Ripple, Dash, and Bitcoin Cash). They also provide data for several standard Forex pairs + gold and silver.
Have a look at their documentation here: https://1forge.com/forex-data-api/api-documentation
If you’re using JavaScript/Node.JS, PHP, Python or Ruby then you can quickly bring in one of their libraries: https://1forge.com/forex-data-api/libraries
