diff --git a/cic_syncer/client/evm/__pycache__/response.cpython-38.pyc b/cic_syncer/client/evm/__pycache__/response.cpython-38.pyc
deleted file mode 100644
index 59f7df3..0000000
Binary files a/cic_syncer/client/evm/__pycache__/response.cpython-38.pyc and /dev/null differ
diff --git a/cic_syncer/client/evm/__pycache__/websocket.cpython-38.pyc b/cic_syncer/client/evm/__pycache__/websocket.cpython-38.pyc
deleted file mode 100644
index 58a6efe..0000000
Binary files a/cic_syncer/client/evm/__pycache__/websocket.cpython-38.pyc and /dev/null differ
diff --git a/cic_syncer/client/evm/response.py b/cic_syncer/client/evm/response.py
index c53933c..9d4f17a 100644
--- a/cic_syncer/client/evm/response.py
+++ b/cic_syncer/client/evm/response.py
@@ -46,3 +46,7 @@ class EVMBlock(Block):
 
     def number(self):
         return translate.hex_to_int(self.obj['number'])
+
+
+    def __str__(self):
+        return str('block {} {}'.format(self.number(), self.hash))
diff --git a/cic_syncer/client/evm/websocket.py b/cic_syncer/client/evm/websocket.py
index 8feadde..3a3ba4a 100644
--- a/cic_syncer/client/evm/websocket.py
+++ b/cic_syncer/client/evm/websocket.py
@@ -1,12 +1,15 @@
+# standard imports
 import logging
 import uuid
 import json
 
+# third-party imports
 import websocket
+from hexathon import add_0x
 
+# local imports
 from .response import EVMResponse
 from cic_syncer.error import RequestError
-from cic_syncer.client.translate import with_0x
 from cic_syncer.client.evm.response import EVMBlock
 
 logg = logging.getLogger()
@@ -66,7 +69,7 @@ class EVMWebsocketClient:
 
     def get_block_by_hash(self, hx_in):
         req_id = str(uuid.uuid4())
-        hx = with_0x(hx_in)
+        hx = add_0x(hx_in)
         req ={
                 'jsonrpc': '2.0',
                 'method': 'eth_getBlockByHash',
diff --git a/cic_syncer/client/translate.py b/cic_syncer/client/translate.py
index 4331afd..0b29e47 100644
--- a/cic_syncer/client/translate.py
+++ b/cic_syncer/client/translate.py
@@ -1,27 +1,10 @@
-import re
-
-re_hex = r'^[0-9a-fA-Z]+$'
-def is_hex(hx):
-    m = re.match(re_hex, hx)
-    if m == None:
-        raise ValueError('not valid hex {}'.format(hx))
-
-    return hx
-
-
-def strip_0x(hx):
-    if len(hx) >= 2 and hx[:2] == '0x':
-        hx = hx[2:]
-    return is_hex(hx)
-
-
-def with_0x(hx):
-    if len(hx) >= 2 and hx[:2] == '0x':
-        hx = hx[2:]
-    return '0x' + is_hex(hx)
+# third-party imports
+from hexathon import strip_0x
 
 
 def hex_to_int(hx, endianness='big'):
     hx = strip_0x(hx)
+    if len(hx) % 2 == 1:
+        hx = '0' + hx
     b = bytes.fromhex(hx)
     return int.from_bytes(b, endianness)
diff --git a/cic_syncer/driver.py b/cic_syncer/driver.py
index 87cfa60..2068ea3 100644
--- a/cic_syncer/driver.py
+++ b/cic_syncer/driver.py
@@ -36,8 +36,10 @@ class MinedSyncer(Syncer):
 
     def loop(self, interval, getter):
         while self.running and Syncer.running_global:
-            block_hash = self.get(getter)
-            if block_hash != None:
+            while True:
+                block_hash = self.get(getter)
+                if block_hash == None:
+                    break
                 self.process(getter, block_hash)
             time.sleep(interval)
 
@@ -49,18 +51,18 @@ class HeadSyncer(MinedSyncer):
 
 
     def process(self, getter, block):
-        logg.debug('process block {}'.format(block))
+        logg.debug('process {}'.format(block))
         block = getter.get_block_by_hash(block.hash)
         i = 0
         tx = None
         while True:
             try:
-                self.filter[0].handle(getter, block, None)
+                #self.filter[0].handle(getter, block, None)
                 tx = block.tx(i)
                 logg.debug('tx {}'.format(tx))
                 self.backend.set(block.number(), i)
                 for f in self.filter:
-                    f(getter, block, tx)
+                    f.handle(getter, block, tx)
             except IndexError as e:
                 self.backend.set(block.number() + 1, 0)
                 break
@@ -75,4 +77,3 @@ class HeadSyncer(MinedSyncer):
         logg.debug('get {}'.format(res))
 
         return res
-
diff --git a/cic_syncer/runnable/tracker.py b/cic_syncer/runnable/tracker.py
index ae9dc21..7b9c5e3 100644
--- a/cic_syncer/runnable/tracker.py
+++ b/cic_syncer/runnable/tracker.py
@@ -104,13 +104,14 @@ def tx_filter(w3, tx, rcpt, chain_spec):
 re_websocket = re.compile('^wss?://')
 re_http = re.compile('^https?://')
 c = EVMWebsocketClient(config.get('ETH_PROVIDER'))
-chain = args.i
+chain = config.get('CIC_CHAIN_SPEC')
 
 
 def main(): 
     block_offset = c.block_number()
 
-    syncer_backend = SyncerBackend.live(chain, block_offset+1)
+    #syncer_backend = SyncerBackend.live(chain, block_offset+1)
+    syncer_backend = SyncerBackend.live(chain, 0)
     syncer = HeadSyncer(syncer_backend, handler)
 
     for cb in config.get('TASKS_SYNCER_CALLBACKS', '').split(','):
diff --git a/requirements.txt b/requirements.txt
index 6f24aa8..b2a8af7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,3 +6,4 @@ eth-tester==0.5.0b3
 web3==5.12.2
 confini==0.3.6b2
 semver==2.13.0
+hexathon==0.0.1a2