diff --git a/tools/tx_sign_tool.py b/tools/tx_sign_tool.py
new file mode 100755
index 000000000..c0618f064
--- /dev/null
+++ b/tools/tx_sign_tool.py
@@ -0,0 +1,97 @@
+#!/usr/bin/env python2
+#
+# Copyright (C) 2017 mruddy
+#
+# This library is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import print_function
+
+import binascii
+from trezorlib.client import TrezorClient
+from trezorlib.transport_hid import HidTransport
+from trezorlib.tx_api import *
+from trezorlib import types_pb2 as types
+
+def main():
+    print('Welcome to the user-unfriendly transaction signing tool')
+    print('USE AT YOUR OWN RISK')
+
+    coin = raw_input('Which coin {Bitcoin, Testnet, Litecoin}? ').strip()
+
+    if coin not in {'Bitcoin', 'Testnet', 'Litecoin'}:
+        print('not supported')
+        exit(1)
+
+    # List all connected TREZORs on USB
+    devices = HidTransport.enumerate()
+
+    # Check whether we found any
+    if len(devices) == 0:
+        print('No TREZOR found')
+        return
+
+    # Use first connected device
+    transport = HidTransport(devices[0])
+
+    # Creates object for manipulating TREZOR
+    client = TrezorClient(transport)
+
+    txapi_lookup = {
+        'Bitcoin': TxApiBitcoin,
+        'Testnet': TxApiTestnet,
+        'Litecoin': TxApiLitecoin
+    }
+
+    client.set_tx_api(txapi_lookup[coin])
+
+    inputs = []
+
+    while True:
+        prev_in_hash = raw_input('Previous input hash (enter nothing to move on): ').strip()
+        if prev_in_hash == '':
+            break
+        prev_in_vout = raw_input('    Previous input index: ').strip()
+        addrn = raw_input("    Node to sign with (e.g.- " + coin + "/0'/0/0): ").strip()
+        inputs.append(types.TxInputType(
+            prev_hash = binascii.unhexlify(prev_in_hash),
+            prev_index = int(prev_in_vout, 10),
+            address_n = client.expand_path(addrn)
+        ))
+
+    outputs = []
+
+    while True:
+        out_addr = raw_input('Pay to address (enter nothing to move on): ').strip()
+        if out_addr == '':
+            break
+        out_amount = raw_input('    Amount (in satoshis): ').strip()
+        outputs.append(types.TxOutputType(
+            amount = int(out_amount, 10),
+            script_type = types.PAYTOADDRESS,
+            address = out_addr
+        ))
+
+    (signatures, serialized_tx) = client.sign_tx(coin, inputs, outputs)
+
+    print('Signed Transaction:', binascii.hexlify(serialized_tx))
+
+    # note: these api's are useful for checking and sending the output of this tool:
+    # https://btc.blockr.io/tx/push -or- https://live.blockcypher.com/btc/pushtx/
+    # https://tbtc.blockr.io/tx/push -or- https://live.blockcypher.com/btc-testnet/pushtx/
+    # https://ltc.blockr.io/tx/push -or - https://live.blockcypher.com/ltc/pushtx/
+
+    client.close()
+
+if __name__ == '__main__':
+    main()
diff --git a/trezorlib/tx_api.py b/trezorlib/tx_api.py
index b1dd2b5de..6f406b48f 100644
--- a/trezorlib/tx_api.py
+++ b/trezorlib/tx_api.py
@@ -41,7 +41,7 @@ class TxApi(object):
             except:
                 pass
         try:
-            r = requests.get('%s/%s/%s' % (self.url, resource, resourceid), headers={'User-agent': 'Mozilla/5.0'})
+            r = requests.get('%s%s/%s' % (self.url, resource, resourceid), headers={'User-agent': 'Mozilla/5.0'})
             j = r.json()
         except:
             raise Exception('URL error: %s' % url)
@@ -140,7 +140,40 @@ class TxApiSmartbit(TxApi):
         return t
 
 
+class TxApiBlockCypher(TxApi):
+
+    def get_tx(self, txhash):
+
+        data = self.fetch_json(self.url, 'txs', txhash)
+
+        t = proto_types.TransactionType()
+        t.version = data['ver']
+        t.lock_time = data['lock_time']
+
+        for vin in data['inputs']:
+            i = t.inputs.add()
+            if 'prev_hash' not in vin:
+                i.prev_hash = b"\0"*32
+                i.prev_index = 0xffffffff # signed int -1
+                i.script_sig = binascii.unhexlify(vin['script'])
+                i.sequence = vin['sequence']
+            else:
+                i.prev_hash = binascii.unhexlify(vin['prev_hash'])
+                i.prev_index = vin['output_index']
+                i.script_sig = binascii.unhexlify(vin['script'])
+                i.sequence = vin['sequence']
+
+        for vout in data['outputs']:
+            o = t.bin_outputs.add()
+            o.amount = int(str(vout['value']), 10)
+            o.script_pubkey = binascii.unhexlify(vout['script'])
+
+        return t
+
+
 TxApiBitcoin = TxApiInsight(network='insight_bitcoin', url='https://insight.bitpay.com/api/')
 TxApiTestnet = TxApiInsight(network='insight_testnet', url='https://test-insight.bitpay.com/api/')
+TxApiLitecoin = TxApiBlockCypher(network='blockcypher_litecoin', url='https://api.blockcypher.com/v1/ltc/main/')
 TxApiSegnet = TxApiSmartbit(network='smartbit_segnet', url='https://segnet-api.smartbit.com.au/v1/blockchain/')
 TxApiZcashTestnet = TxApiInsight(network='insight_zcashtestnet', url='https://explorer.testnet.z.cash/api/', zcash=True)
+