diff --git a/piker/brokers/cli.py b/piker/brokers/cli.py
index 4079a236..0d84384d 100644
--- a/piker/brokers/cli.py
+++ b/piker/brokers/cli.py
@@ -39,6 +39,131 @@ _config_dir = click.get_app_dir('piker')
 _watchlists_data_path = os.path.join(_config_dir, 'watchlists.json')
 
 
+OK = '\033[92m'
+WARNING = '\033[93m'
+FAIL = '\033[91m'
+ENDC = '\033[0m'
+
+
+def print_ok(s: str, **kwargs):
+    print(OK + s + ENDC, **kwargs)
+
+
+def print_error(s: str, **kwargs):
+    print(FAIL + s + ENDC, **kwargs)
+
+
+def get_method(client, meth_name: str):
+    print(f'checking client for method \'{meth_name}\'...', end='', flush=True)
+    method = getattr(client, meth_name, None)
+    assert method
+    print_ok('found!.')
+    return method
+
+async def run_method(client, meth_name: str, **kwargs):
+    method = get_method(client, meth_name)
+    print('running...', end='', flush=True)
+    result = await method(**kwargs)
+    print_ok(f'done! result: {type(result)}')
+    return result
+
+async def run_test(broker_name: str):
+    brokermod = get_brokermod(broker_name)
+    total = 0
+    passed = 0
+    failed = 0
+
+    print(f'getting client...', end='', flush=True)
+    if not hasattr(brokermod, 'get_client'):
+        print_error('fail! no \'get_client\' context manager found.')
+        return
+
+    async with brokermod.get_client(is_brokercheck=True) as client:
+        print_ok(f'done! inside client context.')
+
+        # check for methods present on brokermod
+        method_list = [
+            'backfill_bars',
+            'get_client',
+            'trades_dialogue',
+            'open_history_client',
+            'open_symbol_search',
+            'stream_quotes',
+
+        ]
+
+        for method in method_list:
+            print(
+                f'checking brokermod for method \'{method}\'...',
+                end='', flush=True)
+            if not hasattr(brokermod, method):
+                print_error(f'fail! method \'{method}\' not found.')
+                failed += 1
+            else:
+                print_ok('done!')
+                passed += 1
+
+            total += 1
+
+        # check for methods present con brokermod.Client and their
+        # results
+
+        # for private methods only check is present
+        method_list = [
+            'get_balances',
+            'get_assets',
+            'get_trades',
+            'get_xfers',
+            'submit_limit',
+            'submit_cancel',
+            'search_symbols',
+        ]
+
+        for method_name in method_list:
+            try:
+                get_method(client, method_name)
+                passed += 1
+
+            except AssertionError:
+                print_error(f'fail! method \'{method_name}\' not found.')
+                failed += 1
+
+            total += 1
+
+
+        # check for methods present con brokermod.Client and their
+        # results
+
+        syms = await run_method(client, 'symbol_info')
+        total += 1
+
+        if len(syms) == 0:
+            raise BaseException('Empty Symbol list?')
+
+        passed += 1
+
+        first_sym = tuple(syms.keys())[0]
+
+        method_list = [
+            ('cache_symbols', {}),
+            ('search_symbols', {'pattern': first_sym[:-1]}),
+            ('bars', {'symbol': first_sym})
+        ]
+
+        for method_name, method_kwargs in method_list:
+            try:
+                await run_method(client, method_name, **method_kwargs)
+                passed += 1
+
+            except AssertionError:
+                print_error(f'fail! method \'{method_name}\' not found.')
+                failed += 1
+
+            total += 1
+
+        print(f'total: {total}, passed: {passed}, failed: {failed}')
+
+
 @cli.command()
 @click.argument('broker', nargs=1, required=True)
 @click.pass_obj
@@ -47,90 +172,10 @@ def brokercheck(config, broker):
     Test broker apis for completeness.
 
     '''
-    OK = '\033[92m'
-    WARNING = '\033[93m'
-    FAIL = '\033[91m'
-    ENDC = '\033[0m'
-
-    def print_ok(s: str, **kwargs):
-        print(OK + s + ENDC, **kwargs)
-
-    def print_error(s: str, **kwargs):
-        print(FAIL + s + ENDC, **kwargs)
-
-    def get_method(client, meth_name: str):
-        print(f'checking client for method \'{meth_name}\'...', end='', flush=True)
-        method = getattr(client, meth_name, None)
-        assert method
-        print_ok('found!.')
-        return method
-
-    async def run_test(broker_name: str):
-        brokermod = get_brokermod(broker_name)
-        total = 0
-        passed = 0
-        failed = 0
-
-        print(f'getting client...', end='', flush=True)
-        if not hasattr(brokermod, 'get_client'):
-            print_error('fail! no \'get_client\' context manager found.')
-            return
-
-        async with brokermod.get_client(is_brokercheck=True) as client:
-            print_ok(f'done! inside client context.')
-
-            # check for methods present on brokermod
-            method_list = [
-                'backfill_bars',
-                'get_client',
-                'trades_dialogue',
-                'open_history_client',
-                'open_symbol_search',
-                'stream_quotes',
-
-            ]
-
-            for method in method_list:
-                print(
-                    f'checking brokermod for method \'{method}\'...',
-                    end='', flush=True)
-                if not hasattr(brokermod, method):
-                    print_error(f'fail! method \'{method}\' not found.')
-                    failed += 1
-                else:
-                    print_ok('done!')
-                    passed += 1
-
-                total += 1
-
-            # check for methods present con brokermod.Client and their
-            # results
-
-            # for private methods only check is present
-            method_list = [
-                'get_balances',
-                'get_assets',
-                'get_trades',
-                'get_xfers',
-                'submit_limit',
-                'submit_cancel',
-                'cache_symbols',
-                'search_symbols',
-                'bars'
-            ]
-
-            for method_name in method_list:
-                try:
-                    get_method(client, method_name)
-                    passed += 1
-
-                except AssertionError:
-                    print_error(f'fail! method \'{method_name}\' not found.')
-                    failed += 1
-
-                total += 1
-
-            print(f'total: {total}, passed: {passed}, failed: {failed}')
+    async def bcheck_main():
+        async with maybe_spawn_brokerd(broker) as portal:
+            await portal.run(run_test, broker)
+            await portal.cancel_actor()
 
     trio.run(run_test, broker)
 
diff --git a/piker/brokers/deribit/api.py b/piker/brokers/deribit/api.py
index 15f90e29..ab21b75b 100644
--- a/piker/brokers/deribit/api.py
+++ b/piker/brokers/deribit/api.py
@@ -26,7 +26,7 @@ from contextlib import asynccontextmanager as acm, AsyncExitStack
 from itertools import count
 from functools import partial
 from datetime import datetime
-from typing import Any, List, Dict, Optional, Iterable, Callable
+from typing import Any, Optional, Iterable, Callable
 
 import pendulum
 import asks
@@ -91,14 +91,14 @@ class JSONRPCResult(Struct):
 
 
 class KLinesResult(Struct):
-    close: List[float]
-    cost: List[float]
-    high: List[float]
-    low: List[float]
-    open: List[float]
+    close: list[float]
+    cost: list[float]
+    high: list[float]
+    low: list[float]
+    open: list[float]
     status: str
-    ticks: List[int]
-    volume: List[float]
+    ticks: list[int]
+    volume: list[float]
 
 class Trade(Struct):
     trade_seq: int
@@ -116,7 +116,7 @@ class Trade(Struct):
     amount: float
 
 class LastTradesResult(Struct):
-    trades: List[Trade]
+    trades: list[Trade]
     has_more: bool
 
 
@@ -414,37 +414,28 @@ async def get_client(
     is_brokercheck: bool = False
 ) -> Client:
 
-    if is_brokercheck:
-        yield Client
-        return
-
     async with (
         trio.open_nursery() as n,
         open_autorecon_ws(_testnet_ws_url) as ws
     ):
 
         _rpc_id: Iterable = count(0)
-        _rpc_results: Dict[int, Dict] = {}
+        _rpc_results: dict[int, dict] = {}
 
         _expiry_time: int = float('inf')
         _access_token: Optional[str] = None
         _refresh_token: Optional[str] = None
 
-        def _next_json_body(method: str, params: Dict):
-            """get the typical json rpc 2.0 msg body and increment the req id
+        async def json_rpc(method: str, params: dict) -> dict:
+            """perform a json rpc call and wait for the result, raise exception in
+            case of error field present on response
             """
-            return {
+            msg = {
                 'jsonrpc': '2.0',
                 'id': next(_rpc_id),
                 'method': method,
                 'params': params
             }
-
-        async def json_rpc(method: str, params: Dict) -> Dict:
-            """perform a json rpc call and wait for the result, raise exception in
-            case of error field present on response
-            """
-            msg = _next_json_body(method, params)
             _id = msg['id']
 
             _rpc_results[_id] = {
@@ -546,6 +537,7 @@ async def get_client(
 
         await client.cache_symbols()
         yield client
+        n.cancel_scope.cancel()
 
 
 @acm
@@ -618,7 +610,8 @@ async def aio_price_feed_relay(
 
 @acm
 async def open_price_feed(
-    instrument: str) -> trio.abc.ReceiveStream:
+    instrument: str
+) -> trio.abc.ReceiveStream:
     async with maybe_open_feed_handler() as fh:
         async with to_asyncio.open_channel_from(
             partial(
@@ -684,7 +677,7 @@ async def aio_order_feed_relay(
 
 @acm
 async def open_order_feed(
-    instrument: List[str]
+    instrument: list[str]
 ) -> trio.abc.ReceiveStream:
     async with maybe_open_feed_handler() as fh:
         async with to_asyncio.open_channel_from(
diff --git a/piker/brokers/deribit/feed.py b/piker/brokers/deribit/feed.py
index a45861f7..714ef61b 100644
--- a/piker/brokers/deribit/feed.py
+++ b/piker/brokers/deribit/feed.py
@@ -20,7 +20,7 @@ Deribit backend.
 '''
 from contextlib import asynccontextmanager as acm
 from datetime import datetime
-from typing import Any, Optional, List, Callable
+from typing import Any, Optional, Callable
 import time
 
 import trio