diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4d7a47888..807e96b49 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,10 @@ at anytime.
   *
   *
 
+### Added
+  * Added validation of currencies.
+  *
+
 ### Fixed
   *
   *
diff --git a/lbrynet/conf.py b/lbrynet/conf.py
index 22c9662b7..2e168d805 100644
--- a/lbrynet/conf.py
+++ b/lbrynet/conf.py
@@ -8,6 +8,7 @@ import yaml
 import envparse
 from appdirs import user_data_dir, user_config_dir
 from lbrynet.core import utils
+from lbrynet.core.Error import InvalidCurrencyError
 
 try:
     from lbrynet.winhelpers.knownpaths import get_path, FOLDERID, UserHandle
@@ -351,6 +352,10 @@ class Config(object):
         assert name not in self._fixed_defaults, \
             ValueError('{} is not an editable setting'.format(name))
 
+    def _validate_currency(self, currency):
+        if currency not in self._fixed_defaults['CURRENCIES'].keys():
+            raise InvalidCurrencyError(currency)
+
     def get(self, name, data_type=None):
         """Get a config value
 
@@ -388,6 +393,10 @@ class Config(object):
         data types (e.g. PERSISTED values to save to a file, CLI values from parsed
         command-line options, etc), you can specify that with the data_types param
         """
+        if name == "max_key_fee":
+            currency = str(value["currency"]).upper()
+            self._validate_currency(currency)
+
         self._assert_editable_setting(name)
         for data_type in data_types:
             self._assert_valid_data_type(data_type)
diff --git a/lbrynet/core/Error.py b/lbrynet/core/Error.py
index 02316d6d2..d1e8bb785 100644
--- a/lbrynet/core/Error.py
+++ b/lbrynet/core/Error.py
@@ -139,3 +139,9 @@ class InvalidAuthenticationToken(Exception):
 
 class NegotiationError(Exception):
     pass
+
+class InvalidCurrencyError(Exception):
+    def __init__(self, currency):
+        self.currency = currency
+        Exception.__init__(
+            self, 'Invalid currency: {} is not a supported currency.'.format(currency))
diff --git a/tests/unit/test_conf.py b/tests/unit/test_conf.py
index d7adeb174..194d565af 100644
--- a/tests/unit/test_conf.py
+++ b/tests/unit/test_conf.py
@@ -1,8 +1,9 @@
 import os
+import json
 
 from twisted.trial import unittest
 from lbrynet import conf
-
+from lbrynet.core.Error import InvalidCurrencyError
 
 class SettingsTest(unittest.TestCase):
     def setUp(self):
@@ -54,6 +55,21 @@ class SettingsTest(unittest.TestCase):
         settings.set('test', 'runtime_takes_precedence', data_types=(conf.TYPE_RUNTIME,))
         self.assertEqual('runtime_takes_precedence', settings['test'])
 
+    def test_max_key_fee_set(self):
+        fixed_default = {'CURRENCIES':{'BTC':{'type':'crypto'}}}
+        adjustable_settings = {'max_key_fee': (json.loads, {'currency':'USD', 'amount':1})}
+        env = conf.Env(**adjustable_settings)
+        settings = conf.Config(fixed_default, adjustable_settings, environment=env)
+
+        with self.assertRaises(InvalidCurrencyError):
+            settings.set('max_key_fee', {'currency':'USD', 'amount':1})
+
+        valid_setting= {'currency':'BTC', 'amount':1}
+        settings.set('max_key_fee', valid_setting )
+        out = settings.get('max_key_fee')
+        self.assertEqual(out, valid_setting)
+
+
     def test_data_dir(self):
         # check if these directories are returned as string and not unicode
         # otherwise there will be problems when calling os.path.join on