diff --git a/lib/server.js b/lib/server.js
index d12c60b..94ec2e3 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -226,7 +226,7 @@ CopayServer.prototype._getUtxos = function (opts, cb) {
 				if (err) return cb(err);
 
 				var inputs = _.chain(txps)
-					.pluck('input')
+					.pluck('inputs')
 					.flatten()
 					.map(function (utxo) { return utxo.txid + '|' + utxo.vout });
 
@@ -260,23 +260,39 @@ CopayServer.prototype._getUtxos = function (opts, cb) {
 		if (err) return cb(err);
 
 		var balance = {};
-		balance.totalAmount = _.reduce(utxos, function(sum, utxo) { return sum + utxo.amount; });
-		balance.lockedAmount = _.reduce(_.without(utxos, { locked: true }), function(sum, utxo) { return sum + utxo.amount; });
+		balance.totalAmount = _.reduce(utxos, function(sum, utxo) { return sum + utxo.amount; }, 0);
+		balance.lockedAmount = _.reduce(_.without(utxos, { locked: true }), function(sum, utxo) { return sum + utxo.amount; }, 0);
 
 		return cb(null, balance);
 	});
 };
 
 
-CopayServer.prototype._createRawTx = function (txp, utxos) {
+CopayServer.prototype._createRawTx = function (txp) {
 	var rawTx = new Bitcore.Transaction()
-		.from(utxos)
+		.from(tx.inputs)
 		.to(txp.toAddress, txp.amount)
 		.change(txp.changeAddress);
 
 	return rawTx;
 };
 
+CopayServer.prototype._selectUtxos = function (txp, utxos) {
+	var i = 0;
+	var total = 0;
+	var selected = [];
+	var inputs = _.sortBy(utxos, 'amount');
+	while (i < inputs.length) {
+		selected.push(inputs[i]);
+		total += inputs[i].amount;
+		if (total >= txp.amount) {
+			break;
+		}
+		i++;
+	};
+	return selected;
+};
+
 
 /**
  * Creates a new transaction proposal.
@@ -303,13 +319,13 @@ CopayServer.prototype.createTx = function (opts, cb) {
 				creatorId: opts.copayerId,
 				toAddress: opts.toAddress,
 				amount: opts.amount,
+				inputs: self._selectUtxos(opts.amount, utxos),
 				changeAddress: opts.changeAddress,
 				requiredSignatures: wallet.m,
 				maxRejections: wallet.n - wallet.m,
 			});
-			txp.rawTx = self._createRawTx(txp, utxos);
 
-			// TODO: assign used inputs
+			txp.rawTx = self._createRawTx(txp);
 
 			self.storage.storeTx(wallet.id, txp, function (err) {
 				if (err) return cb(err);
diff --git a/test/integration.js b/test/integration.js
index dfcd580..ee7db7c 100644
--- a/test/integration.js
+++ b/test/integration.js
@@ -423,7 +423,7 @@ describe('Copay server', function() {
         copayerId: '1',
         walletId: '123',
         toAddress: 'dummy',
-        amount: 100,
+        amount: 80,
         message: 'some message',
         otToken: 'dummy',
         requestSignature: 'dummy',
@@ -437,7 +437,12 @@ describe('Copay server', function() {
         server.getPendingTxs({ walletId: '123' }, function (err, txs) {
           should.not.exist(err);
           txs.length.should.equal(1);
-          done();
+          server.getBalance({ walletId: '123' }, function (err, balance) {
+            should.not.exist(err);
+            balance.totalAmount.should.equal(300);
+            balance.lockedAmount.should.equal(200);
+            done();
+          });
         });
       });
     });