diff --git a/datamaxi/api.py b/datamaxi/api.py
index f321a71..91ea59e 100644
--- a/datamaxi/api.py
+++ b/datamaxi/api.py
@@ -113,6 +113,11 @@ def _mount_retries(self, max_retries, retry_backoff, retry_statuses):
         self.session.mount("https://", adapter)
         self.session.mount("http://", adapter)
 
+    def __repr__(self):
+        return "{}(base_url={!r}, has_key={})".format(
+            type(self).__name__, self.base_url, bool(self.api_key)
+        )
+
     def query(self, url_path, payload=None):
         return self.send_request("GET", url_path, payload=payload)
 
@@ -283,6 +288,11 @@ class Resource(object):
     def __init__(self, api_key=None, api=None, **kwargs):
         self._api = api if api is not None else API(api_key, **kwargs)
 
+    def __repr__(self):
+        return "{}(base_url={!r}, has_key={})".format(
+            type(self).__name__, self._api.base_url, bool(self._api.api_key)
+        )
+
     def request_endpoint(self, op_id, **params):
         return self._api.request_endpoint(op_id, **params)
 
diff --git a/datamaxi/lib/utils.py b/datamaxi/lib/utils.py
index b9c9997..3e71ffe 100644
--- a/datamaxi/lib/utils.py
+++ b/datamaxi/lib/utils.py
@@ -1,6 +1,5 @@
 from typing import List
 from urllib.parse import urlencode
-import pandas as pd
 from functools import wraps
 from datamaxi.error import ParameterRequiredError
 from datamaxi.error import AtLeastOneParameterRequiredError
@@ -70,6 +69,8 @@ def encoded_string(query):
 
 
 def convert_to_df(data, header: bool, index: str = None, apply_fn={}):
+    import pandas as pd
+
     df = pd.DataFrame(data)
 
     if header:
diff --git a/datamaxi/naver/__init__.py b/datamaxi/naver/__init__.py
index 0ed6f0d..2875a85 100644
--- a/datamaxi/naver/__init__.py
+++ b/datamaxi/naver/__init__.py
@@ -1,10 +1,14 @@
-from typing import Any, List, Union
-import pandas as pd
+from __future__ import annotations
+
+from typing import Any, List, Union, TYPE_CHECKING
 from datamaxi.api import Resource
 from datamaxi.resources.responses import NaverTrendRow
 from datamaxi.lib.utils import check_required_parameter
 from datamaxi.lib.constants import BASE_URL
 
+if TYPE_CHECKING:
+    import pandas as pd
+
 
 class Naver(Resource):
     """Client to fetch Naver trend data from DataMaxi+ API."""
@@ -51,5 +55,7 @@ def trend(
         check_required_parameter(symbol, "symbol")
         res = self.request_endpoint("naver_trend", symbol=symbol)
         if pandas:
+            import pandas as pd
+
             return pd.DataFrame(res)
         return res
diff --git a/datamaxi/resources/__init__.py b/datamaxi/resources/__init__.py
index cc5ad21..1f74e4a 100644
--- a/datamaxi/resources/__init__.py
+++ b/datamaxi/resources/__init__.py
@@ -47,6 +47,7 @@ def __init__(self, api_key=None, **kwargs: Any):
         # pool threaded through every sub-client instead of each opening
         # its own. Sub-clients receive it via `api=` and forward it down.
         api = API(api_key, **kwargs)
+        self._api = api
 
         self.cex = Cex(api=api)
         self.funding_rate = FundingRate(api=api)
@@ -62,3 +63,8 @@ def __init__(self, api_key=None, **kwargs: Any):
         self.open_interest = OpenInterest(api=api)
         self.margin_borrow = MarginBorrow(api=api)
         self.index_price = IndexPrice(api=api)
+
+    def __repr__(self):
+        return "Datamaxi(base_url={!r}, has_key={})".format(
+            self._api.base_url, bool(self._api.api_key)
+        )
diff --git a/datamaxi/resources/cex_candle.py b/datamaxi/resources/cex_candle.py
index 6b4e3e4..b687a1a 100644
--- a/datamaxi/resources/cex_candle.py
+++ b/datamaxi/resources/cex_candle.py
@@ -1,5 +1,6 @@
-from typing import Any, List, Dict, Union, Optional
-import pandas as pd
+from __future__ import annotations
+
+from typing import Any, List, Dict, Union, Optional, TYPE_CHECKING
 from datamaxi.api import Resource
 from datamaxi.lib.utils import check_required_parameter
 from datamaxi.lib.utils import check_required_parameters
@@ -7,6 +8,9 @@
 from datamaxi.resources.responses import CandleResponse
 from datamaxi.lib.constants import SPOT, FUTURES, INTERVAL_1D, USD, Market, Interval
 
+if TYPE_CHECKING:
+    import pandas as pd
+
 
 class CexCandle(Resource):
     """Client to fetch CEX candle data from DataMaxi+ API."""
diff --git a/datamaxi/resources/cex_ticker.py b/datamaxi/resources/cex_ticker.py
index 24797cb..b9beca7 100644
--- a/datamaxi/resources/cex_ticker.py
+++ b/datamaxi/resources/cex_ticker.py
@@ -1,10 +1,14 @@
-from typing import Any, List, Union
-import pandas as pd
+from __future__ import annotations
+
+from typing import Any, List, Union, TYPE_CHECKING
 from datamaxi.api import Resource
 from datamaxi.lib.utils import check_required_parameters
 from datamaxi.resources.responses import TickerResponse
 from datamaxi.lib.constants import SPOT, FUTURES, Market
 
+if TYPE_CHECKING:
+    import pandas as pd
+
 
 class CexTicker(Resource):
     """Client to fetch ticker data from DataMaxi+ API."""
@@ -70,6 +74,8 @@ def get(
         )
 
         if pandas:
+            import pandas as pd
+
             df = pd.DataFrame([res["data"]])
             df = df.set_index("d")
             return df
diff --git a/datamaxi/resources/cex_wallet_status.py b/datamaxi/resources/cex_wallet_status.py
index dbd6f1c..5f2894f 100644
--- a/datamaxi/resources/cex_wallet_status.py
+++ b/datamaxi/resources/cex_wallet_status.py
@@ -1,10 +1,14 @@
-from typing import Any, List, Union
-import pandas as pd
+from __future__ import annotations
+
+from typing import Any, List, Union, TYPE_CHECKING
 from datamaxi.api import Resource
 from datamaxi.resources.responses import WalletStatusRow
 from datamaxi.lib.utils import check_required_parameters
 from datamaxi.lib.utils import check_required_parameter
 
+if TYPE_CHECKING:
+    import pandas as pd
+
 
 class CexWalletStatus(Resource):
     """Client to fetch transfer status data from DataMaxi+ API."""
@@ -47,6 +51,8 @@ def __call__(
 
         res = self.request_endpoint("wallet_status", exchange=exchange, asset=asset)
         if pandas:
+            import pandas as pd
+
             df = pd.DataFrame(res)
             df = df.set_index("network")
             return df
diff --git a/datamaxi/resources/forex.py b/datamaxi/resources/forex.py
index ec808ec..92a58bd 100644
--- a/datamaxi/resources/forex.py
+++ b/datamaxi/resources/forex.py
@@ -1,9 +1,13 @@
-from typing import Any, List, Union
-import pandas as pd
+from __future__ import annotations
+
+from typing import Any, List, Union, TYPE_CHECKING
 from datamaxi.api import Resource
 from datamaxi.resources.responses import ForexRow
 from datamaxi.lib.utils import check_required_parameter
 
+if TYPE_CHECKING:
+    import pandas as pd
+
 
 class Forex(Resource):
     """Client to fetch forex data from DataMaxi+ API."""
@@ -43,6 +47,8 @@ def __call__(
         res = self.request_endpoint("forex", symbol=symbol)
 
         if pandas:
+            import pandas as pd
+
             return pd.DataFrame([res])
         else:
             return res
diff --git a/datamaxi/resources/funding_rate.py b/datamaxi/resources/funding_rate.py
index d48aadc..89c399b 100644
--- a/datamaxi/resources/funding_rate.py
+++ b/datamaxi/resources/funding_rate.py
@@ -1,5 +1,6 @@
-from typing import Any, Callable, Tuple, List, Union
-import pandas as pd
+from __future__ import annotations
+
+from typing import Any, Callable, Tuple, List, Union, TYPE_CHECKING
 from datamaxi.api import Resource
 from datamaxi.lib.utils import check_required_parameter
 from datamaxi.lib.utils import check_required_parameters
@@ -7,6 +8,9 @@
 from datamaxi.resources.responses import FundingHistoryResponse, LatestFundingRate
 from datamaxi.lib.constants import ASC, DESC, SortOrder
 
+if TYPE_CHECKING:
+    import pandas as pd
+
 
 class FundingRate(Resource):
     """Client to fetch funding rate data from DataMaxi+ API."""
@@ -126,6 +130,8 @@ def latest(
         )
 
         if pandas:
+            import pandas as pd
+
             df = pd.DataFrame([res])
             df = df.set_index("d")
             return df
diff --git a/datamaxi/resources/premium.py b/datamaxi/resources/premium.py
index bea1981..edcb828 100644
--- a/datamaxi/resources/premium.py
+++ b/datamaxi/resources/premium.py
@@ -1,9 +1,13 @@
-from typing import Any, List, Union, Optional
-import pandas as pd
+from __future__ import annotations
+
+from typing import Any, List, Union, Optional, TYPE_CHECKING
 from datamaxi.api import Resource
 from datamaxi.resources.responses import PremiumResponse
 from datamaxi.lib.constants import Market, SortOrder
 
+if TYPE_CHECKING:
+    import pandas as pd
+
 
 class Premium(Resource):
     """Client to fetch premium data from DataMaxi+ API."""
@@ -148,6 +152,8 @@ def __call__(  # noqa: C901
             raise ValueError("no data found")
 
         if pandas:
+            import pandas as pd
+
             df = pd.DataFrame(
                 [
                     {
diff --git a/datamaxi/resources/utils.py b/datamaxi/resources/utils.py
index 7024af2..09b2f40 100644
--- a/datamaxi/resources/utils.py
+++ b/datamaxi/resources/utils.py
@@ -1,11 +1,17 @@
-from typing import List
-import pandas as pd
+from __future__ import annotations
+
+from typing import List, TYPE_CHECKING
+
+if TYPE_CHECKING:
+    import pandas as pd
 
 
 def convert_data_to_data_frame(
     data: List,
     columns_to_replace: List[str] = [],
 ) -> pd.DataFrame:
+    import pandas as pd
+
     df = pd.DataFrame(data)
     df = df.set_index("d")
 
diff --git a/tests/test_repr_and_lazy_pandas.py b/tests/test_repr_and_lazy_pandas.py
new file mode 100644
index 0000000..30a1f9e
--- /dev/null
+++ b/tests/test_repr_and_lazy_pandas.py
@@ -0,0 +1,42 @@
+"""Tests for the #143 polish: __repr__ and lazy pandas import."""
+
+import subprocess
+import sys
+
+from datamaxi import Datamaxi
+from datamaxi.api import API
+
+BASE_URL = "https://api.datamaxiplus.com"
+
+
+def test_api_repr():
+    r = repr(API(api_key="secret", base_url=BASE_URL))
+    assert r == "API(base_url='https://api.datamaxiplus.com', has_key=True)"
+    assert "secret" not in r
+
+
+def test_resource_repr_uses_class_name():
+    c = Datamaxi(api_key="secret", base_url=BASE_URL)
+    assert repr(c.cex) == "Cex(base_url='https://api.datamaxiplus.com', has_key=True)"
+    assert (
+        repr(c.cex.candle)
+        == "CexCandle(base_url='https://api.datamaxiplus.com', has_key=True)"
+    )
+    assert "secret" not in repr(c.cex.candle)
+
+
+def test_datamaxi_repr_and_no_key_leak(monkeypatch):
+    c = Datamaxi(api_key="secret", base_url=BASE_URL)
+    assert repr(c) == "Datamaxi(base_url='https://api.datamaxiplus.com', has_key=True)"
+    assert "secret" not in repr(c)
+    # has_key=False only holds with no key from arg *or* environment
+    monkeypatch.delenv("DATAMAXI_API_KEY", raising=False)
+    assert "has_key=False" in repr(Datamaxi(base_url=BASE_URL))
+
+
+def test_importing_datamaxi_does_not_load_pandas():
+    # Isolated subprocess: other tests in this session load pandas, so a
+    # same-process sys.modules check would be unreliable.
+    code = "import sys, datamaxi; " "sys.exit(0 if 'pandas' not in sys.modules else 1)"
+    result = subprocess.run([sys.executable, "-c", code])
+    assert result.returncode == 0, "importing datamaxi should not import pandas"