diff --git a/api/obs/api/routes/exports.py b/api/obs/api/routes/exports.py
index 26f4bd8..c71670b 100644
--- a/api/obs/api/routes/exports.py
+++ b/api/obs/api/routes/exports.py
@@ -12,8 +12,7 @@ from sanic.response import raw
 from sanic.exceptions import InvalidUsage
 
 from obs.api.app import app, json as json_response
-
-from .mapdetails import get_single_arg
+from obs.api.utils import get_single_arg
 
 
 class ExportFormat(str, Enum):
diff --git a/api/obs/api/routes/mapdetails.py b/api/obs/api/routes/mapdetails.py
index 832ba02..9d08dd8 100644
--- a/api/obs/api/routes/mapdetails.py
+++ b/api/obs/api/routes/mapdetails.py
@@ -10,33 +10,11 @@ from sanic.exceptions import InvalidUsage
 
 from obs.api.app import api
 from obs.api.db import Road, OvertakingEvent, Track
-
-
-from .stats import round_to
+from obs.api.utils import round_to, get_single_arg
 
 round_distance = partial(round_to, multiples=0.001)
 round_speed = partial(round_to, multiples=0.1)
 
-RAISE = object()
-
-
-def get_single_arg(req, name, default=RAISE, convert=None):
-    try:
-        value = req.args[name][0]
-    except LookupError as e:
-        if default is RAISE:
-            raise InvalidUsage(f"missing `{name}`") from e
-
-        value = default
-
-    if convert is not None:
-        try:
-            value = convert(value)
-        except (ValueError, TypeError) as e:
-            raise InvalidUsage(f"invalid `{name}`") from e
-
-    return value
-
 
 def get_bearing(a, b):
     # longitude, latitude
diff --git a/api/obs/api/routes/stats.py b/api/obs/api/routes/stats.py
index 5292361..1e7b248 100644
--- a/api/obs/api/routes/stats.py
+++ b/api/obs/api/routes/stats.py
@@ -11,6 +11,7 @@ from sanicargs import parse_parameters
 
 from obs.api.app import api
 from obs.api.db import Track, OvertakingEvent, User
+from obs.api.utils import round_to
 
 
 log = logging.getLogger(__name__)
@@ -26,12 +27,6 @@ TRACK_DURATION_ROUNDING = 120
 MINUMUM_RECORDING_DATE = datetime(2010, 1, 1)
 
 
-def round_to(value: float, multiples: float) -> float:
-    if value is None:
-        return None
-    return round(value / multiples) * multiples
-
-
 @api.route("/stats")
 @parse_parameters
 async def stats(req, user: str = None, start: datetime = None, end: datetime = None):
diff --git a/api/obs/api/utils.py b/api/obs/api/utils.py
new file mode 100644
index 0000000..8175e9b
--- /dev/null
+++ b/api/obs/api/utils.py
@@ -0,0 +1,27 @@
+from sanic.exceptions import InvalidUsage
+
+RAISE = object()
+
+
+def get_single_arg(req, name, default=RAISE, convert=None):
+    try:
+        value = req.args[name][0]
+    except LookupError as e:
+        if default is RAISE:
+            raise InvalidUsage(f"missing `{name}`") from e
+
+        value = default
+
+    if convert is not None:
+        try:
+            value = convert(value)
+        except (ValueError, TypeError) as e:
+            raise InvalidUsage(f"invalid `{name}`: {str(e)}") from e
+
+    return value
+
+
+def round_to(value: float, multiples: float) -> float:
+    if value is None:
+        return None
+    return round(value / multiples) * multiples