diff --git a/roboquant/__init__.py b/roboquant/__init__.py
index 6f3c091..939bed3 100644
--- a/roboquant/__init__.py
+++ b/roboquant/__init__.py
@@ -1,11 +1,11 @@
-__version__ = "0.2.4"
+__version__ = "0.2.5"
 
 from roboquant import brokers
 from roboquant import feeds
 from roboquant import journals
 from roboquant import strategies
 from roboquant import traders
-from .account import Account, OptionAccount, Position
+from .account import Account, Position, Converter, CurrencyConverter, OptionConverter
 from .config import Config
 from .event import Event, PriceItem, Candle, Trade, Quote
 from .order import Order, OrderStatus
diff --git a/roboquant/account.py b/roboquant/account.py
index a114e41..4b52585 100644
--- a/roboquant/account.py
+++ b/roboquant/account.py
@@ -62,17 +62,17 @@ def __call__(self, symbol: str, time: datetime) -> float:
 
 
 class CurrencyConverter(Converter):
-    """Support symbols that are denoted in a different currency from the base currency of the account"""
+    """Supports trading in symbols that are denoted in a different currency from the base currency of the account"""
 
-    def __init__(self, base_currency="USD", default_symbol_currency="USD"):
+    def __init__(self, base_currency="USD", default_symbol_currency: str | None = "USD"):
         super().__init__()
         self.rates = {}
         self.base_currency = base_currency
         self.default_symbol_currency = default_symbol_currency
-        self.registered_symbols = {}
+        self.registered_symbols: dict[str, str] = {}
 
     def register_symbol(self, symbol: str, currency: str):
-        """Register a symbol being denoted in a currency"""
+        """Register a symbol and its denoted currency"""
         self.registered_symbols[symbol] = currency
 
     def register_rate(self, currency: str, rate: float):
@@ -81,6 +81,8 @@ def register_rate(self, currency: str, rate: float):
 
     def __call__(self, symbol: str, _: datetime) -> float:
         currency = self.registered_symbols.get(symbol, self.default_symbol_currency)
+        if not currency:
+            raise ValueError(f"no currency or default_symbol_currency registered for symbol={symbol}")
         if currency == self.base_currency:
             return 1.0
         return self.rates[currency]
@@ -114,9 +116,9 @@ def register_converter(converter: Converter):
         Account.__converter = converter
 
     def contract_value(self, symbol: str, size: Decimal, price: float) -> float:
-        # pylint: disable=unused-argument
+        # pylint: disable=not-callable
         """Return the total value of the provided contract size denoted in the base currency of the account."""
-        rate = 1.0 if not Account.__converter else Account.__converter.__call__(symbol, self.last_update)
+        rate = 1.0 if not Account.__converter else Account.__converter(symbol, self.last_update)
         return float(size) * price * rate
 
     def mkt_value(self, prices: dict[str, float]) -> float:
diff --git a/roboquant/feeds/csvfeed.py b/roboquant/feeds/csvfeed.py
index 635ff24..a0dbc91 100644
--- a/roboquant/feeds/csvfeed.py
+++ b/roboquant/feeds/csvfeed.py
@@ -15,28 +15,28 @@ class CSVFeed(HistoricFeed):
     """Use CSV files with historic data as a feed."""
 
     def __init__(
-            self,
-            path: str | pathlib.Path,
-            columns=None,
-            adj_close=False,
-            time_offset: str | None = None,
-            datetime_fmt: str | None = None,
-            endswith=".csv",
-            frequency="",
+        self,
+        path: str | pathlib.Path,
+        columns=None,
+        adj_close=False,
+        time_offset: str | None = None,
+        datetime_fmt: str | None = None,
+        endswith=".csv",
+        frequency="",
     ):
         super().__init__()
-        self.columns = columns
-        self.time_offset = time_offset
+        columns = columns or ["Date", "Open", "High", "Low", "Close", "Volume", "AdjClose"]
+        self.ohlcv_columns = columns[1:7] if adj_close else columns[1:6]
+        self.date_column = columns[0]
         self.datetime_fmt = datetime_fmt
         self.adj_close = adj_close
-        self.endswith = endswith
         self.freq = frequency
+        self.endswith = endswith
+        self.time_offset = time.fromisoformat(time_offset) if time_offset is not None else None
 
         files = self._get_files(path)
         logger.info("located %s files in path %s", len(files), path)
-
-        for file in files:
-            self._parse_csvfile(file)  # type: ignore
+        self._parse_csvfiles(files)  # type: ignore
 
     def _get_files(self, path):
         if pathlib.Path(path).is_file():
@@ -52,31 +52,28 @@ def _get_symbol(self, filename: str):
         """Return the symbol based on the filename"""
         return pathlib.Path(filename).stem.upper()
 
-    def _parse_csvfile(self, filename: str):
+    def _parse_csvfiles(self, filenames: list[str]):
         adj_close = self.adj_close
         datetime_fmt = self.datetime_fmt
-        columns = self.columns or ["Date", "Open", "High", "Low", "Close", "Volume", "AdjClose"]
-        price_columns = columns[1:7] if adj_close else columns[1:6]
-        date_column = columns[0]
-        symbol = self._get_symbol(filename)
+        ohlcv_columns = self.ohlcv_columns
+        date_column = self.date_column
         freq = self.freq
-        t = time.fromisoformat(self.time_offset) if self.time_offset is not None else None
-
-        with open(filename, encoding="utf8") as csvfile:
-            reader = csv.DictReader(csvfile)
-
-            for row in reader:
-                dt = (
-                    datetime.fromisoformat(row[date_column])  # type: ignore
-                    if datetime_fmt is None
-                    else datetime.strptime(row[date_column], datetime_fmt)  # type: ignore
-                )
-                if t:
-                    dt = datetime.combine(dt, t)
-
-                prices = array("f", [float(row[column_name]) for column_name in price_columns])
-                pb = Candle(symbol, prices, freq) if not adj_close else Candle.from_adj_close(symbol, prices, freq)
-                self._add_item(dt.astimezone(timezone.utc), pb)
+        time_offset = self.time_offset
+
+        for filename in filenames:
+            symbol = self._get_symbol(filename)
+            with open(filename, encoding="utf8") as csvfile:
+                reader = csv.DictReader(csvfile)
+
+                for row in reader:
+                    date_str = row[date_column]
+                    dt = datetime.strptime(date_str, datetime_fmt) if datetime_fmt else datetime.fromisoformat(date_str)
+                    if time_offset:
+                        dt = datetime.combine(dt, time_offset)
+
+                    ohlcv = array("f", [float(row[column]) for column in ohlcv_columns])
+                    pb = Candle(symbol, ohlcv, freq) if not adj_close else Candle.from_adj_close(symbol, ohlcv, freq)
+                    self._add_item(dt.astimezone(timezone.utc), pb)
 
     @classmethod
     def stooq_us_daily(cls, path):
diff --git a/roboquant/feeds/historicfeed.py b/roboquant/feeds/historicfeed.py
index 430de5c..33e6bfe 100644
--- a/roboquant/feeds/historicfeed.py
+++ b/roboquant/feeds/historicfeed.py
@@ -33,20 +33,20 @@ def _add_item(self, time: datetime, item: PriceItem):
 
     @property
     def symbols(self):
-        """Return all the symbols available in this feed"""
+        """Return the list of symbols available in this feed"""
         self.__update()
         return self.__symbols
 
     def timeline(self) -> List[datetime]:
-        """Return the timeline of this feed"""
+        """Return the timeline of this feed as a list of datatime"""
         self.__update()
         return list(self.__data.keys())
 
     def timeframe(self):
         """Return the timeframe of this feed"""
         tl = self.timeline()
-        if len(tl) == 0:
-            return Timeframe.empty()
+        if not tl:
+            raise ValueError("Feed doesn't contain any events.")
 
         return Timeframe(tl[0], tl[-1], inclusive=True)
 
@@ -62,3 +62,9 @@ def play(self, channel: EventChannel):
         for k, v in self.__data.items():
             evt = Event(k, v)
             channel.put(evt)
+
+    def __repr__(self) -> str:
+        events = len(self.timeline())
+        timeframe = self.timeframe() if events else None
+        feed = self.__class__.__name__
+        return f"{feed}(events={events} symbols={len(self.symbols)} timeframe={timeframe})"
diff --git a/roboquant/feeds/yahoofeed.py b/roboquant/feeds/yahoofeed.py
index 36344b9..a091a2e 100644
--- a/roboquant/feeds/yahoofeed.py
+++ b/roboquant/feeds/yahoofeed.py
@@ -1,6 +1,7 @@
 import logging
 from array import array
-from datetime import datetime, timezone
+from datetime import timezone
+import warnings
 
 import yfinance
 
@@ -15,17 +16,14 @@ class YahooFeed(HistoricFeed):
 
     def __init__(self, *symbols: str, start_date="2010-01-01", end_date: str | None = None, interval="1d"):
         super().__init__()
-
-        end_date = end_date or datetime.now().strftime("%Y-%m-%d")
-
+        warnings.simplefilter(action="ignore", category=FutureWarning)
         columns = ["Open", "High", "Low", "Close", "Volume", "Adj Close"]
 
         for symbol in symbols:
             logger.debug("requesting symbol=%s", symbol)
             df = yfinance.Ticker(symbol).history(
-                start=start_date, end=end_date, auto_adjust=False, actions=False, interval=interval
+                start=start_date, end=end_date, auto_adjust=False, actions=False, interval=interval, timeout=30
             )[columns]
-            df.dropna(inplace=True)
 
             if len(df) == 0:
                 logger.warning("no data retrieved for symbol=%s", symbol)
@@ -33,6 +31,7 @@ def __init__(self, *symbols: str, start_date="2010-01-01", end_date: str | None
 
             # yFinance one doesn't correct the volume, so we use this one instead
             self.__auto_adjust(df)
+
             for t in df.itertuples(index=True):
                 dt = t[0].to_pydatetime().astimezone(timezone.utc)
                 prices = t[1:6]
diff --git a/roboquant/timeframe.py b/roboquant/timeframe.py
index 117a802..91f5ddf 100644
--- a/roboquant/timeframe.py
+++ b/roboquant/timeframe.py
@@ -1,5 +1,6 @@
 import random
 from datetime import datetime, timedelta, timezone
+from typing import Any
 
 
 class Timeframe:
@@ -94,12 +95,13 @@ def annualize(self, rate: float) -> float:
         years = timedelta(days=365) / self.duration
         return (1.0 + rate) ** years - 1.0
 
-    def split(self, n: int | timedelta) -> list["Timeframe"]:
+    def split(self, n: int | timedelta | Any) -> list["Timeframe"]:
         """Split the timeframe in sequential parts and return the resulting list of timeframes.
-        The parameter `n` can be a number or a timedelta instance.
+        The parameter `n` can be a number or a timedelta instance or other types like relativedelta that support
+        datetime calculations.
         """
 
-        period = n if isinstance(n, timedelta) else self.duration / n
+        period = self.duration / n if isinstance(n, int) else n
         end = self.start
         result = []
         while end < self.end:
@@ -113,7 +115,7 @@ def split(self, n: int | timedelta) -> list["Timeframe"]:
             last.end = self.end
         return result
 
-    def sample(self, duration: timedelta, n: int = 1) -> list["Timeframe"]:
+    def sample(self, duration: timedelta | Any, n: int = 1) -> list["Timeframe"]:
         """Sample one or more periods of `duration` from this timeframe."""
 
         result = []
diff --git a/tests/performance/test_profiling.py b/tests/performance/test_profiling.py
index 38cbb5c..4c69228 100644
--- a/tests/performance/test_profiling.py
+++ b/tests/performance/test_profiling.py
@@ -11,8 +11,8 @@ class TestProfile(unittest.TestCase):
     def test_profile(self):
         path = os.path.expanduser("~/data/nasdaq_stocks/1")
         feed = rq.feeds.CSVFeed.stooq_us_daily(path)
-        print("timeframe =", feed.timeframe(), " symbols =", len(feed.symbols))
-        strategy = rq.strategies.EMACrossover(13, 26)
+        print(feed)
+        strategy = rq.strategies.EMACrossover()
         journal = rq.journals.BasicJournal()
 
         # Profile the run to detect bottlenecks
diff --git a/tests/unit/test_account.py b/tests/unit/test_account.py
index 845e4ad..1a56c17 100644
--- a/tests/unit/test_account.py
+++ b/tests/unit/test_account.py
@@ -1,7 +1,7 @@
 import unittest
 from decimal import Decimal
 
-from roboquant import Account, Position, OptionAccount
+from roboquant import Account, Position, OptionConverter
 
 
 class TestAccount(unittest.TestCase):
@@ -25,8 +25,11 @@ def test_account_positions(self):
         self.assertAlmostEqual(acc.unrealized_pnl(prices), 0.0)
 
     def test_account_option(self):
-        acc = OptionAccount()
-        acc.register("DUMMY", 5.0)
+        oc = OptionConverter()
+        oc.register("DUMMY", 5.0)
+        acc = Account()
+        acc.register_converter(oc)
+
         self.assertEqual(1000.0, acc.contract_value("DUMMY", Decimal(1), 200.0))
         self.assertEqual(200.0, acc.contract_value("TSLA", Decimal(1), 200.0))