diff --git a/lib/server.js b/lib/server.js
index e6343af..c774e7f 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -1683,14 +1683,30 @@ WalletService.prototype._validateAndSanitizeTxOpts = function(wallet, opts, cb)
   async.series([
 
     function(next) {
-      // feePerKb is required unless inputs & fee are specified
-      if (!_.isNumber(opts.feePerKb) && !(opts.inputs && _.isNumber(opts.fee)))
-        return next(new ClientError('Required argument missing'));
+      var feeArgs = !!opts.feeLevel + _.isNumber(opts.feePerKb) + _.isNumber(opts.fee);
+      if (feeArgs > 1)
+        return next(new ClientError('Only one of feeLevel/feePerKb/fee can be specified'));
+
+      if (feeArgs == 0) {
+        log.debug('No fee provided, using "normal" fee level');
+        opts.feeLevel = 'normal';
+      }
+
+      if (opts.feeLevel) {
+        if (!_.any(Defaults.FEE_LEVELS, {
+          name: opts.feeLevel
+        }))
+          return next(new ClientError('Invalid fee level. Valid values are ' + _.pluck(Defaults.FEE_LEVELS, 'name').join(', ')));
+      }
 
       if (_.isNumber(opts.feePerKb)) {
         if (opts.feePerKb < Defaults.MIN_FEE_PER_KB || opts.feePerKb > Defaults.MAX_FEE_PER_KB)
           return next(new ClientError('Invalid fee per KB'));
       }
+
+      if (_.isNumber(opts.fee) && !opts.inputs)
+        return next(new ClientError('fee can only be set when inputs are specified'));
+
       next();
     },
     function(next) {
@@ -1705,7 +1721,7 @@ WalletService.prototype._validateAndSanitizeTxOpts = function(wallet, opts, cb)
       if (_.isNumber(opts.outputs[0].amount))
         return next(new ClientError('Amount is not allowed when sendMax is specified'));
       if (_.isNumber(opts.fee))
-        return next(new ClientError('Fee is not allowed when sendMax is specified (use feePerKb instead)'));
+        return next(new ClientError('Fee is not allowed when sendMax is specified (use feeLevel/feePerKb instead)'));
 
       self.getSendMaxInfo({
         feePerKb: opts.feePerKb || Defaults.DEFAULT_FEE_PER_KB,
@@ -1738,7 +1754,8 @@ WalletService.prototype._validateAndSanitizeTxOpts = function(wallet, opts, cb)
  * @param {number} opts.outputs[].amount - Amount to transfer in satoshi.
  * @param {string} opts.outputs[].message - A message to attach to this output.
  * @param {string} opts.message - A message to attach to this transaction.
- * @param {number} opts.feePerKb - Use an alternative fee per KB for this TX.
+ * @param {number} opts.feeLevel[='normal'] - Optional. Specify the fee level for this TX ('priority', 'normal', 'economy', 'superEconomy') as defined in Defaults.FEE_LEVELS.
+ * @param {number} opts.feePerKb - Optional. Specify the fee per KB for this TX (in satoshi).
  * @param {string} opts.changeAddress - Optional. Use this address as the change address for the tx. The address should belong to the wallet. In the case of singleAddress wallets, the first main address will be used.
  * @param {Boolean} opts.sendMax - Optional. Send maximum amount of funds that make sense under the specified fee/feePerKb conditions. (defaults to false).
  * @param {string} opts.payProUrl - Optional. Paypro URL for peers to verify TX
@@ -1774,13 +1791,33 @@ WalletService.prototype.createTx = function(opts, cb) {
     }
   };
 
+
+  function getFeePerKb(wallet, cb) {
+    if (opts.inputs && _.isNumber(opts.fee)) return null;
+    if (_.isNumber(opts.feePerKb)) return opts.feePerKb;
+    self.getFeeLevels({
+      network: wallet.network
+    }, function(err, levels) {
+      if (err) return cb(err);
+      var level = _.find(levels, {
+        level: opts.feeLevel
+      });
+      if (!level) {
+        var msg = 'Could not compute fee for "' + opts.feeLevel + '" level';
+        log.error(msg);
+        return cb(new ClientError(msg));
+      }
+      return cb(null, level.feePerKb);
+    });
+  };
+
   function checkTxpAlreadyExists(txProposalId, cb) {
     if (!txProposalId) return cb();
     self.storage.fetchTx(self.walletId, txProposalId, cb);
   };
 
   self._runLocked(cb, function(cb) {
-    var txp, changeAddress;
+    var txp, changeAddress, feePerKb;
     self.getWallet({}, function(err, wallet) {
       if (err) return cb(err);
       if (!wallet.isComplete()) return cb(Errors.WALLET_NOT_COMPLETE);
@@ -1809,6 +1846,12 @@ WalletService.prototype.createTx = function(opts, cb) {
               next();
             });
           },
+          function(next) {
+            getFeePerKb(wallet, function(err, fee) {
+              feePerKb = fee;
+              next();
+            });
+          },
           function(next) {
             var txOpts = {
               id: opts.txProposalId,
@@ -1817,7 +1860,7 @@ WalletService.prototype.createTx = function(opts, cb) {
               outputs: opts.outputs,
               message: opts.message,
               changeAddress: changeAddress,
-              feePerKb: opts.feePerKb,
+              feePerKb: feePerKb,
               payProUrl: opts.payProUrl,
               walletM: wallet.m,
               walletN: wallet.n,
@@ -1853,7 +1896,6 @@ WalletService.prototype.createTx = function(opts, cb) {
     });
   });
 };
-
 WalletService.prototype._verifyRequestPubKey = function(requestPubKey, signature, xPubKey) {
   var pub = (new Bitcore.HDPublicKey(xPubKey)).derive(Constants.PATHS.REQUEST_KEY_AUTH).publicKey;
   return Utils.verifyMessage(requestPubKey, signature, pub.toString());