diff --git a/accounting/__init__.py b/accounting/__init__.py
index eaf52ad..d9cbaa2 100644
--- a/accounting/__init__.py
+++ b/accounting/__init__.py
@@ -7,6 +7,8 @@ from datetime import datetime
 from xml.etree import ElementTree
 from contextlib import contextmanager
 
+from accounting.models import Account, Transaction, Posting, Amount
+
 _log = logging.getLogger(__name__)
 
 class Ledger:
@@ -112,6 +114,11 @@ class Ledger:
             return output
 
     def add_transaction(self, transaction):
+        '''
+        Writes a transaction to the ledger file by opening it in 'ab' mode and
+        writing a ledger transaction based on the Transaction instance in
+        ``transaction``.
+        '''
         transaction_template = ('\n{date} {t.payee}\n'
                                 '{postings}')
 
@@ -127,7 +134,7 @@ class Ledger:
                 p=p,
                 account=p.account + ' ' * (
                     80 - (len(p.account) + len(p.amount.symbol) +
-                    len(p.amount.amount) + 1 + 2)
+                    len(str(p.amount.amount)) + 1 + 2)
                 )) for p in transaction.postings])).encode('utf8')
 
         with open(self.ledger_file, 'ab') as f:
@@ -212,50 +219,6 @@ class Ledger:
         return entries
 
 
-class Transaction:
-    def __init__(self, date=None, payee=None, postings=None):
-        self.date = date
-        self.payee = payee
-        self.postings = postings
-
-    def __repr__(self):
-        return ('<{self.__class__.__name__} {date}' +
-                ' {self.payee} {self.postings}').format(
-                    self=self,
-                    date=self.date.strftime('%Y-%m-%d'))
-
-
-class Posting:
-    def __init__(self, account=None, amount=None):
-        self.account = account
-        self.amount = amount
-
-    def __repr__(self):
-        return ('<{self.__class__.__name__} "{self.account}"' +
-                ' {self.amount}>').format(self=self)
-
-
-class Amount:
-    def __init__(self, amount=None, symbol=None):
-        self.amount = amount
-        self.symbol = symbol
-
-    def __repr__(self):
-        return ('<{self.__class__.__name__} {self.symbol}' +
-                ' {self.amount}>').format(self=self)
-
-
-class Account:
-    def __init__(self, name=None, amounts=None, accounts=None):
-        self.name = name
-        self.amounts = amounts
-        self.accounts = accounts
-
-    def __repr__(self):
-        return ('<{self.__class__.__name__} "{self.name}" {self.amounts}' +
-                ' {self.accounts}>').format(self=self)
-
-
 def main(argv=None):
     import argparse
     if argv is None:
diff --git a/accounting/client.py b/accounting/client.py
new file mode 100644
index 0000000..ef5d62b
--- /dev/null
+++ b/accounting/client.py
@@ -0,0 +1,83 @@
+import sys
+import argparse
+import json
+import logging
+
+from datetime import datetime
+from decimal import Decimal
+
+import requests
+
+from accounting.models import Transaction, Posting, Amount
+from accounting.transport import AccountingDecoder, AccountingEncoder
+
+# TODO: Client should be a class
+
+HOST = None
+
+
+def insert_paypal_transaction(amount):
+    t = Transaction(
+        date=datetime.today(),
+        payee='PayPal donation',
+        postings=[
+            Posting(account='Income:Donations:PayPal',
+                    amount=Amount(symbol='$', amount=-amount)),
+            Posting(account='Assets:Checking',
+                    amount=Amount(symbol='$', amount=amount))
+        ]
+    )
+
+    response = requests.post(HOST + '/transaction',
+                             headers={'Content-Type': 'application/json'},
+                             data=json.dumps({'transactions': [t]},
+                                             cls=AccountingEncoder))
+
+    print(response.json(cls=AccountingDecoder))
+
+
+def get_balance():
+    response = requests.get(HOST + '/balance')
+
+    balance = response.json(cls=AccountingDecoder)
+
+    _recurse_accounts(balance['balance_report'])
+
+
+def _recurse_accounts(accounts, level=0):
+    for account in accounts:
+        print(' ' * level + ' + {account.name}'.format(account=account) +
+              ' ' + '-' * (80 - len(str(account.name)) - level))
+        for amount in account.amounts:
+            print(' ' * level + '   {amount.symbol} {amount.amount}'.format(
+                amount=amount))
+        _recurse_accounts(account.accounts, level+1)
+
+
+def main(argv=None, prog=None):
+    global HOST
+    if argv is None:
+        prog = sys.argv[0]
+        argv = sys.argv[1:]
+
+    parser = argparse.ArgumentParser(prog=prog)
+    parser.add_argument('-p', '--paypal', type=Decimal)
+    parser.add_argument('-v', '--verbosity',
+                        default='WARNING',
+                        help=('Filter logging output. Possible values:' +
+                        ' CRITICAL, ERROR, WARNING, INFO, DEBUG'))
+    parser.add_argument('-b', '--balance', action='store_true')
+    parser.add_argument('--host', default='http://localhost:5000')
+    args = parser.parse_args(argv)
+
+    HOST = args.host
+
+    logging.basicConfig(level=getattr(logging, args.verbosity))
+
+    if args.paypal:
+        insert_paypal_transaction(args.paypal)
+    elif args.balance:
+        get_balance()
+
+if __name__ == '__main__':
+    sys.exit(main())
diff --git a/accounting/models.py b/accounting/models.py
new file mode 100644
index 0000000..f4aa9f2
--- /dev/null
+++ b/accounting/models.py
@@ -0,0 +1,45 @@
+from decimal import Decimal
+
+
+class Transaction:
+    def __init__(self, date=None, payee=None, postings=None):
+        self.date = date
+        self.payee = payee
+        self.postings = postings
+
+    def __repr__(self):
+        return ('<{self.__class__.__name__} {date}' +
+                ' {self.payee} {self.postings}').format(
+                    self=self,
+                    date=self.date.strftime('%Y-%m-%d'))
+
+
+class Posting:
+    def __init__(self, account=None, amount=None):
+        self.account = account
+        self.amount = amount
+
+    def __repr__(self):
+        return ('<{self.__class__.__name__} "{self.account}"' +
+                ' {self.amount}>').format(self=self)
+
+
+class Amount:
+    def __init__(self, amount=None, symbol=None):
+        self.amount = Decimal(amount)
+        self.symbol = symbol
+
+    def __repr__(self):
+        return ('<{self.__class__.__name__} {self.symbol}' +
+                ' {self.amount}>').format(self=self)
+
+
+class Account:
+    def __init__(self, name=None, amounts=None, accounts=None):
+        self.name = name
+        self.amounts = amounts
+        self.accounts = accounts
+
+    def __repr__(self):
+        return ('<{self.__class__.__name__} "{self.name}" {self.amounts}' +
+                ' {self.accounts}>').format(self=self)
diff --git a/accounting/transport.py b/accounting/transport.py
index 72af3e5..0ddb5c1 100644
--- a/accounting/transport.py
+++ b/accounting/transport.py
@@ -2,7 +2,7 @@ from datetime import datetime
 
 from flask import json
 
-from accounting import Amount, Transaction, Posting, Account
+from accounting.models import Amount, Transaction, Posting, Account
 
 class AccountingEncoder(json.JSONEncoder):
     def default(self, o):
@@ -29,7 +29,7 @@ class AccountingEncoder(json.JSONEncoder):
         elif isinstance(o, Amount):
             return dict(
                 __type__=o.__class__.__name__,
-                amount=o.amount,
+                amount=str(o.amount),
                 symbol=o.symbol
             )
         elif isinstance(o, Exception):
diff --git a/bin/client b/bin/client
new file mode 100755
index 0000000..bbf097b
--- /dev/null
+++ b/bin/client
@@ -0,0 +1,9 @@
+#!/usr/bin/env python3
+import sys
+
+sys.path.append('./')
+
+from accounting.client import main
+
+if __name__ == '__main__':
+    sys.exit(main())