An exchange provides one PUB and one REP socket. These are bound on static addresses.

PUB

Periodically publishes the latest exchange data with the following frames:

1. currency code
2. module id
3. array
   1. currency code
   2. rate

REP

Handles queries with the frames:

1. operation
2. currency code
3. ...

Queries

• history

  Returns history for a currency.

  Fields:

  1. array
     1. array
        1. currency code
        2. rate