diff --git a/lib/expressapp.js b/lib/expressapp.js
index d955af4..20933e7 100644
--- a/lib/expressapp.js
+++ b/lib/expressapp.js
@@ -401,10 +401,12 @@ ExpressApp.prototype.start = function(opts, cb) {
 
   router.get('/v1/sendmaxinfo/', function(req, res) {
     getServerWithAuth(req, res, function(server) {
+      var q = req.query;
       var opts = {};
-      opts.feePerKb = +req.query.feePerKb;
-      if (req.query.excludeUnconfirmedUtxos == '1') opts.excludeUnconfirmedUtxos = true;
-      if (req.query.returnInputs == '1') opts.returnInputs = true;
+      if (q.feePerKb) opts.feePerKb = +q.feePerKb;
+      if (q.feeLevel) opts.feeLevel = q.feeLevel;
+      if (q.excludeUnconfirmedUtxos == '1') opts.excludeUnconfirmedUtxos = true;
+      if (q.returnInputs == '1') opts.returnInputs = true;
       server.getSendMaxInfo(opts, function(err, info) {
         if (err) return returnError(err, res, req);
         res.json(info);