CurrencyBuy

java.lang.Object
- nxt.http.APIServlet.APIRequestHandler
- - nxt.http.CurrencyBuy

```
public final class CurrencyBuy
extends APIServlet.APIRequestHandler
```
Buy currency for NXT
Parameters
- currency - currency id
- rateNQT - exchange rate between NXT amount and currency units
- units - number of units to buy
currency buy transaction attempts to match existing exchange offers. When a match is found, the minimum number of units between the number of units offered and the units requested are exchanged at a rate matching the highest sell offer
A single transaction can match multiple sell offers or none. Unlike asset bid order, currency buy is not saved. It's either executed immediately (fully or partially) or not executed at all. For every match between buyer and seller an exchange record is saved, exchange records can be retrieved using the GetExchanges API

Field Summary
- Fields inherited from class nxt.http.APIServlet.APIRequestHandler
  DESCRIPTION_FIELD, MESSAGE_FIELD, NAME_FIELD

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected boolean`	`allowRequiredBlockParameters()`
`protected org.json.simple.JSONStreamAware`	`processRequest(javax.servlet.http.HttpServletRequest req)`
`protected boolean`	`requirePost()`

Methods inherited from class nxt.http.APIServlet.APIRequestHandler
getAPITags, getFileParameter, getParameters, processRequest, requireBlockchain, requireFullClient, requirePassword, startDbTransaction

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - processRequest
```
protected org.json.simple.JSONStreamAware processRequest(javax.servlet.http.HttpServletRequest req)
                                                  throws NxtException
```
    Specified by:
    
    processRequest in class APIServlet.APIRequestHandler
    
    Throws:
    
    NxtException
  - requirePost
```
protected final boolean requirePost()
```
    Overrides:
    
    requirePost in class APIServlet.APIRequestHandler
  - allowRequiredBlockParameters
```
protected final boolean allowRequiredBlockParameters()
```
    Overrides:
    
    allowRequiredBlockParameters in class APIServlet.APIRequestHandler