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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?

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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.

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  • HitBTC also has a Websocket API, see api.hitbtc.com/#socket-api-reference
    – mBardos
    Feb 9 '18 at 12:58
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    While it looks like Kraken has a limit of 1 request per 3 seconds, in reality I find that it handles way more without banning. I have a script getting 4 prices from the API every 3 seconds. According to their docs, that should get me banned in about 20 minutes, but it doesn't.
    – bluppfisk
    May 15 '18 at 15:05
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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

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