Document getConfirmationTime

book/src/jsonrpc-api.md

@@ -22,8 +22,9 @@ Methods
 ---
 
 * [confirmTransaction](#confirmtransaction)
-* [getBalance](#getbalance)
 * [getAccountInfo](#getaccountinfo)
+* [getBalance](#getbalance)
+* [getConfirmationTime](#getconfirmationTime)
 * [getLastId](#getlastid)
 * [getSignatureStatus](#getsignaturestatus)
 * [getTransactionCount](#gettransactioncount)
@@ -201,6 +202,25 @@ curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","id":1, "m
 {"jsonrpc":"2.0","result":268,"id":1}
 ```
 
+---
+### getConfirmationTime
+Returns the current cluster confirmation time in milliseconds
+
+##### Parameters:
+None
+
+##### Results:
+* `integer` - confirmation time in milliseconds, as unsigned 64-bit integer
+
+##### Example:
+```bash
+// Request
+curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","id":1, "method":"getConfirmationTime"}' http://localhost:8899
+
+// Result
+{"jsonrpc":"2.0","result":500,"id":1}
+```
+
 ---
 
 ### requestAirdrop