Promise-base trade api for okcoin.com
npm install okcoin.com


* https://www.okcoin.com/about/rest_getStarted.do
```
npm install okcoin.com
see example directory
``
1. Request limits
Each IP can send maximum of 3000 https requests within 5 minutes. If the 3000 limit is exceeded, the system will automatically block the IP for one hour. After that hour, the IP will be automatically unfrozen.
* 3000 request / 5min
* 600 request / min
* 10 request / sec
```
lib/constant.js
exports.OPT_LIMIT_SEC = 0.2;
* 5 request / sec