diff --git a/src/applications/conduit/protocol/ConduitAPIRequest.php b/src/applications/conduit/protocol/ConduitAPIRequest.php
--- a/src/applications/conduit/protocol/ConduitAPIRequest.php
+++ b/src/applications/conduit/protocol/ConduitAPIRequest.php
@@ -17,6 +17,13 @@
     return coalesce(idx($this->params, $key), $default);
   }
 
+  public function getIntValue($key, $default = 'undefined_magic_text') {
+    if ($default === 'undefined_magic_text' && !$this->getValueExists($key)) {
+      throw new Exception(pht('Required int param not provided: %s', $key));
+    }
+    return (int)$this->getValue($key, $default);
+  }
+
   public function getValueExists($key) {
     return array_key_exists($key, $this->params);
   }
diff --git a/src/applications/diffusion/conduit/DiffusionHistoryQueryConduitAPIMethod.php b/src/applications/diffusion/conduit/DiffusionHistoryQueryConduitAPIMethod.php
--- a/src/applications/diffusion/conduit/DiffusionHistoryQueryConduitAPIMethod.php
+++ b/src/applications/diffusion/conduit/DiffusionHistoryQueryConduitAPIMethod.php
@@ -51,8 +51,8 @@
       $path = null;
     }
 
-    $offset = $request->getValue('offset');
-    $limit = $request->getValue('limit');
+    $offset = $request->getIntValue('offset');
+    $limit = $request->getIntValue('limit', 100);
 
     if (phutil_nonempty_string($against_hash)) {
       $commit_range = "{$against_hash}..{$commit_hash}";