diff --git a/apps/cic-cache/cic_cache/runnable/daemons/filters/base.py b/apps/cic-cache/cic_cache/runnable/daemons/filters/base.py
index 860296de..26e5b31d 100644
--- a/apps/cic-cache/cic_cache/runnable/daemons/filters/base.py
+++ b/apps/cic-cache/cic_cache/runnable/daemons/filters/base.py
@@ -10,6 +10,6 @@ class TagSyncFilter:
 
 
     def __str__(self):
-        if tag_domain == None:
+        if self.tag_domain == None:
             return self.tag_name
         return '{}.{}'.format(self.tag_domain, self.tag_name)
diff --git a/apps/cic-cache/cic_cache/runnable/daemons/filters/erc20.py b/apps/cic-cache/cic_cache/runnable/daemons/filters/erc20.py
index 3a5f4900..0dc618e0 100644
--- a/apps/cic-cache/cic_cache/runnable/daemons/filters/erc20.py
+++ b/apps/cic-cache/cic_cache/runnable/daemons/filters/erc20.py
@@ -15,7 +15,7 @@ from cic_eth_registry.error import (
         )
 
 # local imports
-from .base import SyncFilter
+from .base import TagSyncFilter
 from cic_cache import db as cic_cache_db
 
 logg = logging.getLogger().getChild(__name__)
@@ -24,7 +24,7 @@ logg = logging.getLogger().getChild(__name__)
 class ERC20TransferFilter(TagSyncFilter):
 
     def __init__(self, chain_spec):
-        super(TagSyncFilter, self).__init__('transfer', 'erc20')
+        super(ERC20TransferFilter, self).__init__('transfer', domain='erc20')
         self.chain_spec = chain_spec
 
 
@@ -47,6 +47,9 @@ class ERC20TransferFilter(TagSyncFilter):
         except RequestMismatchException:
             logg.debug('erc20 match but not a transfer, skipping')
             return False
+        except ValueError:
+            logg.debug('erc20 match but bogus data, skipping')
+            return False
 
         token_sender = tx.outputs[0]
         token_recipient = transfer_data[0]
@@ -68,7 +71,13 @@ class ERC20TransferFilter(TagSyncFilter):
                 tx.status == Status.SUCCESS,
                 block.timestamp,
                 )
-        #db_session.flush()
+        db_session.flush()
+        cic_cache_db.tag_transaction(
+                db_session,
+                tx.hash,
+                self.tag_name,
+                domain=self.tag_domain,
+                )
         db_session.commit()
 
         return True
diff --git a/apps/cic-cache/cic_cache/runnable/daemons/tracker.py b/apps/cic-cache/cic_cache/runnable/daemons/tracker.py
index 270e1f6a..ceac150b 100644
--- a/apps/cic-cache/cic_cache/runnable/daemons/tracker.py
+++ b/apps/cic-cache/cic_cache/runnable/daemons/tracker.py
@@ -7,9 +7,10 @@ import argparse
 import sys
 import re
 
-# third-party imports
+# external imports
 import confini
 import celery
+import sqlalchemy
 import rlp
 import cic_base.config
 import cic_base.log
@@ -34,7 +35,10 @@ from chainsyncer.driver import (
 from chainsyncer.db.models.base import SessionBase
 
 # local imports
-from cic_cache.db import dsn_from_config
+from cic_cache.db import (
+        dsn_from_config,
+        add_tag,
+        )
 from cic_cache.runnable.daemons.filters import (
         ERC20TransferFilter,
         )
@@ -59,6 +63,17 @@ chain_spec = ChainSpec.from_chain_str(config.get('CIC_CHAIN_SPEC'))
 cic_base.rpc.setup(chain_spec, config.get('ETH_PROVIDER'))
 
 
+def register_filter_tags(filters, session):
+    for f in filters:
+        tag = f.tag()
+        try:
+            add_tag(session, tag[0], domain=tag[1])
+            session.commit()
+            logg.info('added tag name "{}" domain "{}"'.format(tag[0], tag[1]))
+        except sqlalchemy.exc.IntegrityError:
+            logg.debug('already have tag name "{}" domain "{}"'.format(tag[0], tag[1]))
+
+
 def main():
     # Connect to blockchain with chainlib
     rpc = RPCConnection.connect(chain_spec, 'default')
@@ -98,10 +113,19 @@ def main():
 
     erc20_transfer_filter = ERC20TransferFilter(chain_spec)
 
+    filters = [
+        erc20_transfer_filter,
+            ]
+
+    session = SessionBase.create_session()
+    register_filter_tags(filters, session)
+    session.close()
+
     i = 0
     for syncer in syncers:
         logg.debug('running syncer index {}'.format(i))
-        syncer.add_filter(erc20_transfer_filter)
+        for f in filters:
+            syncer.add_filter(f)
         r = syncer.loop(int(config.get('SYNCER_LOOP_INTERVAL')), rpc)
         sys.stderr.write("sync {} done at block {}\n".format(syncer, r))
 
diff --git a/apps/cic-cache/config/database.ini b/apps/cic-cache/config/database.ini
index e34a1ff5..7c5836a2 100644
--- a/apps/cic-cache/config/database.ini
+++ b/apps/cic-cache/config/database.ini
@@ -6,4 +6,4 @@ HOST=localhost
 PORT=5432
 ENGINE=postgresql
 DRIVER=psycopg2
-DEBUG=
+DEBUG=0
diff --git a/apps/cic-cache/config/test/cic.ini b/apps/cic-cache/config/test/cic.ini
index f52b27bd..d985ae3e 100644
--- a/apps/cic-cache/config/test/cic.ini
+++ b/apps/cic-cache/config/test/cic.ini
@@ -1,2 +1,4 @@
 [cic]
 registry_address = 
+chain_spec = 
+trust_address =
diff --git a/apps/cic-cache/config/test/database.ini b/apps/cic-cache/config/test/database.ini
index 960863a6..113c1fa4 100644
--- a/apps/cic-cache/config/test/database.ini
+++ b/apps/cic-cache/config/test/database.ini
@@ -6,4 +6,4 @@ HOST=localhost
 PORT=5432
 ENGINE=sqlite
 DRIVER=pysqlite
-DEBUG=
+DEBUG=1
diff --git a/apps/cic-cache/test_requirements.txt b/apps/cic-cache/test_requirements.txt
index b6ca05ac..dce79ea1 100644
--- a/apps/cic-cache/test_requirements.txt
+++ b/apps/cic-cache/test_requirements.txt
@@ -4,3 +4,10 @@ pytest-mock==3.3.1
 pysqlite3==0.4.3
 sqlparse==0.4.1
 pytest-celery==0.0.0a1
+eth_tester==0.5.0b3
+py-evm==0.3.0a20
+web3==5.12.2
+cic-eth-registry~=0.5.5a3
+giftable-erc20-token~=0.0.8a10
+eth-address-index~=0.1.1a10
+sarafu-faucet~=0.0.3a1
diff --git a/apps/cic-cache/tests/conftest.py b/apps/cic-cache/tests/conftest.py
index d45cf8ff..00db9ae0 100644
--- a/apps/cic-cache/tests/conftest.py
+++ b/apps/cic-cache/tests/conftest.py
@@ -3,7 +3,7 @@ import os
 import sys
 import datetime
 
-# third-party imports
+# external imports
 import pytest
 
 # local imports
diff --git a/apps/cic-cache/tests/filters/conftest.py b/apps/cic-cache/tests/filters/conftest.py
new file mode 100644
index 00000000..50fa9b64
--- /dev/null
+++ b/apps/cic-cache/tests/filters/conftest.py
@@ -0,0 +1,3 @@
+from chainlib.eth.pytest import *
+from cic_eth_registry.pytest.fixtures_tokens import *
+
diff --git a/apps/cic-cache/tests/filters/test_erc20.py b/apps/cic-cache/tests/filters/test_erc20.py
new file mode 100644
index 00000000..d7582ed1
--- /dev/null
+++ b/apps/cic-cache/tests/filters/test_erc20.py
@@ -0,0 +1,69 @@
+# standard imports
+import os
+import datetime
+import logging
+import json
+
+# external imports
+import pytest
+from sqlalchemy import text
+from chainlib.eth.tx import Tx
+from chainlib.eth.block import Block
+from chainlib.chain import ChainSpec
+from hexathon import (
+        strip_0x,
+        add_0x,
+        )
+
+# local imports
+from cic_cache.db import add_tag
+from cic_cache.runnable.daemons.filters.erc20 import ERC20TransferFilter
+
+logg = logging.getLogger()
+
+
+def test_cache(
+        eth_rpc,
+        foo_token,
+        init_database,
+        list_defaults,
+        list_actors,
+        tags,
+        ):
+
+    chain_spec = ChainSpec('foo', 'bar', 42, 'baz')
+
+    fltr = ERC20TransferFilter(chain_spec)
+
+    add_tag(init_database, fltr.tag_name, domain=fltr.tag_domain)
+
+    data = 'a9059cbb'
+    data += strip_0x(list_actors['alice'])
+    data += '1000'.ljust(64, '0')
+
+    block = Block({
+        'hash': os.urandom(32).hex(),
+        'number': 42,
+        'timestamp': datetime.datetime.utcnow().timestamp(),
+        'transactions': [],
+        })
+
+    tx = Tx({
+        'to': foo_token,
+        'from': list_actors['bob'],
+        'data': data,
+        'value': 0,
+        'hash': os.urandom(32).hex(),
+        'nonce': 13,
+        'gasPrice': 10000000,
+        'gas': 123456,
+            })
+    block.txs.append(tx)
+    tx.block = block
+
+    r = fltr.filter(eth_rpc, block, tx, db_session=init_database)
+    assert r
+
+    s = text("SELECT x.tx_hash FROM tag a INNER JOIN tag_tx_link l ON l.tag_id = a.id INNER JOIN tx x ON x.id = l.tx_id WHERE a.domain = :a AND a.value = :b")
+    r = init_database.execute(s, {'a': fltr.tag_domain, 'b': fltr.tag_name}).fetchone()
+    assert r[0] == tx.hash