diff --git a/lib/expressapp.js b/lib/expressapp.js
index ce325ed..117050b 100644
--- a/lib/expressapp.js
+++ b/lib/expressapp.js
@@ -247,7 +247,22 @@ ExpressApp.prototype.start = function(opts, cb) {
     });
   });
 
+  // DEPRECATED
   router.get('/v1/feelevels/', function(req, res) {
+    var opts = {};
+    if (req.query.network) opts.network = req.query.network;
+    var server = getServer(req, res);
+    server.getFeeLevels(opts, function(err, feeLevels) {
+      if (err) return returnError(err, res, req);
+      feeLevels = _.map(feeLevels, function(feeLevel) {
+        feeLevel.feePerKB = feeLevel.feePerKb;
+        delete feeLevel.feePerKb;
+      });
+      res.json(feeLevels);
+    });
+  });
+
+  router.get('/v2/feelevels/', function(req, res) {
     var opts = {};
     if (req.query.network) opts.network = req.query.network;
     var server = getServer(req, res);
diff --git a/lib/server.js b/lib/server.js
index aa1ff39..5ef4833 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -870,11 +870,11 @@ WalletService.prototype._sampleFeeLevels = function(network, points, cb) {
     }
 
     var levels = _.zipObject(_.map(points, function(p) {
-      var feePerKB = _.isObject(result) ? +result[p] : -1;
-      if (feePerKB < 0) {
+      var feePerKb = _.isObject(result) ? +result[p] : -1;
+      if (feePerKb < 0) {
         log.warn('Could not compute fee estimation (nbBlocks=' + p + ')');
       }
-      return [p, Utils.strip(feePerKB * 1e8)];
+      return [p, Utils.strip(feePerKb * 1e8)];
     }));
 
     return cb(null, levels);
@@ -904,10 +904,10 @@ WalletService.prototype.getFeeLevels = function(opts, cb) {
         level: level.name,
       };
       if (err || feeSamples[level.nbBlocks] < 0) {
-        result.feePerKB = level.defaultValue;
+        result.feePerKb = level.defaultValue;
         result.nbBlocks = null;
       } else {
-        result.feePerKB = feeSamples[level.nbBlocks];
+        result.feePerKb = feeSamples[level.nbBlocks];
         result.nbBlocks = level.nbBlocks;
       }
       return result;
diff --git a/test/integration/server.js b/test/integration/server.js
index 80aab2f..2425f19 100644
--- a/test/integration/server.js
+++ b/test/integration/server.js
@@ -1764,13 +1764,13 @@ describe('Wallet service', function() {
         fees = _.zipObject(_.map(fees, function(item) {
           return [item.level, item];
         }));
-        fees.priority.feePerKB.should.equal(40000);
+        fees.priority.feePerKb.should.equal(40000);
         fees.priority.nbBlocks.should.equal(1);
 
-        fees.normal.feePerKB.should.equal(20000);
+        fees.normal.feePerKb.should.equal(20000);
         fees.normal.nbBlocks.should.equal(2);
 
-        fees.economy.feePerKB.should.equal(18000);
+        fees.economy.feePerKb.should.equal(18000);
         fees.economy.nbBlocks.should.equal(6);
         done();
       });
@@ -1780,7 +1780,7 @@ describe('Wallet service', function() {
       server.getFeeLevels({}, function(err, fees) {
         should.not.exist(err);
         fees = _.zipObject(_.map(fees, function(item) {
-          return [item.level, item.feePerKB];
+          return [item.level, item.feePerKb];
         }));
         fees.priority.should.equal(50000);
         fees.normal.should.equal(20000);
@@ -1799,13 +1799,13 @@ describe('Wallet service', function() {
         fees = _.zipObject(_.map(fees, function(item) {
           return [item.level, item];
         }));
-        fees.priority.feePerKB.should.equal(50000);
+        fees.priority.feePerKb.should.equal(50000);
         should.not.exist(fees.priority.nbBlocks);
 
-        fees.normal.feePerKB.should.equal(18000);
+        fees.normal.feePerKb.should.equal(18000);
         fees.normal.nbBlocks.should.equal(2);
 
-        fees.economy.feePerKB.should.equal(0);
+        fees.economy.feePerKb.should.equal(0);
         fees.economy.nbBlocks.should.equal(6);
         done();
       });