diff --git a/go/apps/jsbox/metrics.py b/go/apps/jsbox/metrics.py
new file mode 100644
index 000000000..4b9c7a107
--- /dev/null
+++ b/go/apps/jsbox/metrics.py
@@ -0,0 +1,94 @@
+# -*- test-case-name: go.apps.jsbox.tests.test_metrics -*-
+# -*- coding: utf-8 -*-
+
+"""Metrics for JS Box sandboxes"""
+
+import re
+
+from vumi.application.sandbox import SandboxResource
+from vumi import log
+
+from vumi.blinkenlights.metrics import SUM, AVG, MIN, MAX
+
+
+class MetricEventError(Exception):
+    """Raised when a command cannot be converted to a metric event."""
+
+
+class MetricEvent(object):
+
+    AGGREGATORS = {
+        'sum': SUM,
+        'avg': AVG,
+        'min': MIN,
+        'max': MAX,
+    }
+
+    NAME_REGEX = re.compile(r"^[a-zA-Z][a-zA-Z0-9]{,100}$")
+
+    def __init__(self, store, metric, value, agg):
+        self.store = store
+        self.metric = metric
+        self.value = value
+        self.agg = agg
+
+    def __eq__(self, other):
+        if not isinstance(other, self.__class__):
+            return False
+        return all((self.store == other.store, self.metric == other.metric,
+                    self.value == other.value, self.agg is other.agg))
+
+    @classmethod
+    def _parse_name(cls, name, kind):
+        if name is None:
+            raise MetricEventError("Missing %s name." % (kind,))
+        if not isinstance(name, basestring):
+            raise MetricEventError("Invalid type for %s name: %r"
+                                   % (kind, name))
+        if not cls.NAME_REGEX.match(name):
+            raise MetricEventError("Invalid %s name: %r." % (kind, name))
+        return name
+
+    @classmethod
+    def _parse_value(cls, value):
+        try:
+            value = float(value)
+        except (ValueError, TypeError):
+            raise MetricEventError("Invalid metric value %r." % (value,))
+        return value
+
+    @classmethod
+    def _parse_agg(cls, agg):
+        if not isinstance(agg, basestring):
+            raise MetricEventError("Invalid metric aggregator %r" % (agg,))
+        if agg not in cls.AGGREGATORS:
+            raise MetricEventError("Invalid metric aggregator %r." % (agg,))
+        return cls.AGGREGATORS[agg]
+
+    @classmethod
+    def from_command(cls, command):
+        store = cls._parse_name(command.get('store', 'default'), 'store')
+        metric = cls._parse_name(command.get('metric'), 'metric')
+        value = cls._parse_value(command.get('value'))
+        agg = cls._parse_agg(command.get('agg'))
+        return cls(store, metric, value, agg)
+
+
+class MetricsResource(SandboxResource):
+    """Resource that provides metric storing."""
+
+    def _publish_event(self, api, ev):
+        conversation = self.app_worker.conversation_for_api(api)
+        self.app_worker.publish_account_metric(conversation.user_account.key,
+                                               ev.store, ev.metric, ev.value,
+                                               ev.agg)
+
+    def handle_fire(self, api, command):
+        """Fire a metric value."""
+        try:
+            ev = MetricEvent.from_command(command)
+        except MetricEventError, e:
+            log.warning(str(e))
+            return self.reply(command, success=False, reason=unicode(e))
+        self._publish_event(api, ev)
+        return self.reply(command, success=True)
diff --git a/go/apps/jsbox/tests/test_metrics.py b/go/apps/jsbox/tests/test_metrics.py
new file mode 100644
index 000000000..12d38bfc6
--- /dev/null
+++ b/go/apps/jsbox/tests/test_metrics.py
@@ -0,0 +1,139 @@
+"""Tests for go.apps.jsbox.metrics."""
+
+import mock
+
+from twisted.trial.unittest import TestCase
+
+from vumi.application.sandbox import SandboxCommand
+from vumi.tests.utils import LogCatcher
+
+from go.apps.jsbox.metrics import (
+    MetricEvent, MetricEventError, MetricsResource)
+
+
+class TestMetricEvent(TestCase):
+
+    SUM = MetricEvent.AGGREGATORS['sum']
+
+    def test_create(self):
+        ev = MetricEvent('mystore', 'foo', 2.0, self.SUM)
+        self.assertEqual(ev.store, 'mystore')
+        self.assertEqual(ev.metric, 'foo')
+        self.assertEqual(ev.value, 2.0)
+        self.assertEqual(ev.agg, self.SUM)
+
+    def test_eq(self):
+        ev1 = MetricEvent('mystore', 'foo', 1.5, self.SUM)
+        ev2 = MetricEvent('mystore', 'foo', 1.5, self.SUM)
+        self.assertEqual(ev1, ev2)
+
+    def test_neq(self):
+        ev1 = MetricEvent('mystore', 'foo', 1.5, self.SUM)
+        ev2 = MetricEvent('mystore', 'bar', 1.5, self.SUM)
+        self.assertNotEqual(ev1, ev2)
+
+    def test_from_command(self):
+        ev = MetricEvent.from_command({'store': 'mystore', 'metric': 'foo',
+                                       'value': 1.5, 'agg': 'sum'})
+        self.assertEqual(ev, MetricEvent('mystore', 'foo', 1.5, self.SUM))
+
+    def test_bad_store(self):
+        self.assertRaises(MetricEventError, MetricEvent.from_command, {
+                'store': 'foo bar', 'metric': 'foo', 'value': 1.5,
+                'agg': 'sum'})
+
+    def test_bad_type_store(self):
+        self.assertRaises(MetricEventError, MetricEvent.from_command, {
+                'store': {}, 'metric': 'foo', 'value': 1.5,
+                'agg': 'sum'})
+
+    def test_bad_metric(self):
+        self.assertRaises(MetricEventError, MetricEvent.from_command, {
+                'store': 'mystore', 'metric': 'foo bar', 'value': 1.5,
+                'agg': 'sum'})
+
+    def test_bad_type_metric(self):
+        self.assertRaises(MetricEventError, MetricEvent.from_command, {
+                'store': 'mystore', 'metric': {}, 'value': 1.5,
+                'agg': 'sum'})
+
+    def test_missing_metric(self):
+        self.assertRaises(MetricEventError, MetricEvent.from_command, {
+                'store': 'mystore', 'value': 1.5, 'agg': 'sum'})
+
+    def test_bad_value(self):
+        self.assertRaises(MetricEventError, MetricEvent.from_command, {
+                'store': 'mystore', 'metric': 'foo', 'value': 'abc',
+                'agg': 'sum'})
+
+    def test_bad_type_value(self):
+        self.assertRaises(MetricEventError, MetricEvent.from_command, {
+                'store': 'mystore', 'metric': 'foo', 'value': {},
+                'agg': 'sum'})
+
+    def test_missing_value(self):
+        self.assertRaises(MetricEventError, MetricEvent.from_command, {
+                'store': 'mystore', 'metric': 'foo', 'agg': 'sum'})
+
+    def test_bad_agg(self):
+        self.assertRaises(MetricEventError, MetricEvent.from_command, {
+                'store': 'mystore', 'metric': 'foo', 'value': 1.5,
+                'agg': 'foo'})
+
+    def test_bad_type_agg(self):
+        self.assertRaises(MetricEventError, MetricEvent.from_command, {
+                'store': 'mystore', 'metric': 'foo', 'value': 1.5,
+                'agg': {}})
+
+    def test_missing_agg(self):
+        self.assertRaises(MetricEventError, MetricEvent.from_command, {
+                'store': 'mystore', 'metric': 'foo', 'value': 1.5})
+
+
+class TestMetricsResource(TestCase):
+
+    SUM = MetricEvent.AGGREGATORS['sum']
+
+    def setUp(self):
+        self.conversation = mock.Mock()
+        self.app_worker = mock.Mock()
+        self.dummy_api = object()
+        self.resource = MetricsResource("test", self.app_worker, {})
+        self.app_worker.conversation_for_api = mock.Mock(
+            return_value=self.conversation)
+
+    def check_reply(self, reply, cmd, success):
+        self.assertEqual(reply['reply'], True)
+        self.assertEqual(reply['cmd_id'], cmd['cmd_id'])
+        self.assertEqual(reply['success'], success)
+
+    def check_publish(self, store, metric, value, agg):
+        self.app_worker.publish_account_metric.assert_called_once_with(
+            self.conversation.user_account.key, store, metric, value, agg)
+
+    def check_not_published(self):
+        self.assertFalse(self.app_worker.publish_account_metric.called)
+
+    def test_handle_fire(self):
+        cmd = SandboxCommand(metric="foo", value=1.5, agg='sum')
+        reply = self.resource.handle_fire(self.dummy_api, cmd)
+        self.check_reply(reply, cmd, True)
+        self.check_publish('default', 'foo', 1.5, self.SUM)
+
+    def _test_error(self, cmd, expected_error):
+        with LogCatcher() as lc:
+            reply = self.resource.handle_fire(self.dummy_api, cmd)
+            self.assertEqual(lc.messages(), [expected_error])
+        self.check_reply(reply, cmd, False)
+        self.assertEqual(reply['reason'], expected_error)
+        self.check_not_published()
+
+    def test_handle_fire_error(self):
+        cmd = SandboxCommand(metric="foo bar", value=1.5, agg='sum')
+        expected_error = "Invalid metric name: 'foo bar'."
+        self._test_error(cmd, expected_error)
+
+    def test_non_ascii_metric_name_error(self):
+        cmd = SandboxCommand(metric=u"b\xe6r", value=1.5, agg='sum')
+        expected_error = "Invalid metric name: u'b\\xe6r'."
+        self._test_error(cmd, expected_error)
diff --git a/go/vumitools/app_worker.py b/go/vumitools/app_worker.py
index 07eddb91f..d96a914e7 100644
--- a/go/vumitools/app_worker.py
+++ b/go/vumitools/app_worker.py
@@ -230,6 +230,11 @@ def publish_conversation_metric(self, conversation, name, value, agg=None):
             conversation.user_account.key, conversation.key, name)
         self.publish_metric(name, value, agg)
 
+    def publish_account_metric(self, user_account_key, store, name, value,
+                               agg=None):
+        name = "%s.%s.%s" % (user_account_key, store, name)
+        self.publish_metric(name, value, agg)
+
     @inlineCallbacks
     def collect_message_metrics(self, conversation):
         """Collect message count metrics.