diff --git a/autobahn/xbr/__init__.py b/autobahn/xbr/__init__.py
index c118ef55c..bc6499498 100644
--- a/autobahn/xbr/__init__.py
+++ b/autobahn/xbr/__init__.py
@@ -48,6 +48,10 @@
     from autobahn.xbr._eip712_consent import sign_eip712_consent, recover_eip712_consent  # noqa
     from autobahn.xbr._eip712_channel_open import sign_eip712_channel_open, recover_eip712_channel_open  # noqa
     from autobahn.xbr._eip712_channel_close import sign_eip712_channel_close, recover_eip712_channel_close  # noqa
+    from autobahn.xbr._eip712_market_member_login import sign_eip712_market_member_login, \
+        recover_eip712_market_member_login  # noqa
+    from autobahn.xbr._eip712_base import is_address, is_chain_id, is_block_number, is_signature, \
+        is_cs_pubkey, is_bytes16, is_eth_privkey  # noqa
 
     from autobahn.xbr._blockchain import SimpleBlockchain  # noqa
     from autobahn.xbr._seller import SimpleSeller, KeySeries  # noqa
@@ -296,6 +300,16 @@ def account_from_seedphrase(seephrase, index=0):
         'recover_eip712_channel_open',
         'sign_eip712_channel_close',
         'recover_eip712_channel_close',
+        'sign_eip712_market_member_login',
+        'recover_eip712_market_member_login',
+
+        'is_bytes16',
+        'is_cs_pubkey',
+        'is_signature',
+        'is_chain_id',
+        'is_eth_privkey',
+        'is_block_number',
+        'is_address',
 
         'load_or_create_profile',
         'UserConfig',
diff --git a/autobahn/xbr/_eip712_market_member_login.py b/autobahn/xbr/_eip712_market_member_login.py
new file mode 100644
index 000000000..f7c28277a
--- /dev/null
+++ b/autobahn/xbr/_eip712_market_member_login.py
@@ -0,0 +1,85 @@
+###############################################################################
+#
+# The MIT License (MIT)
+#
+# Copyright (c) Crossbar.io Technologies GmbH
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+###############################################################################
+
+from ._eip712_base import sign, recover, is_address, is_eth_privkey, \
+    is_signature, is_cs_pubkey
+
+
+def _create_eip712_market_member_login(member: bytes, client_pubkey: bytes) -> dict:
+    assert is_address(member)
+    assert is_cs_pubkey(client_pubkey)
+
+    data = {
+        'types': {
+            'EIP712Domain': [
+                {
+                    'name': 'name',
+                    'type': 'string'
+                },
+                {
+                    'name': 'version',
+                    'type': 'string'
+                },
+            ],
+            'EIP712MarketMemberLogin': [
+                {
+                    'name': 'member',
+                    'type': 'address'
+                },
+                {
+                    'name': 'client_pubkey',
+                    'type': 'bytes32',
+                },
+            ]
+        },
+        'primaryType': 'EIP712MarketMemberLogin',
+        'domain': {
+            'name': 'XBR',
+            'version': '1',
+        },
+        'message': {
+            'member': member,
+            'client_pubkey': client_pubkey,
+        }
+    }
+
+    return data
+
+
+def sign_eip712_market_member_login(eth_privkey: bytes, member: bytes, client_pubkey: bytes) -> bytes:
+    assert is_eth_privkey(eth_privkey)
+
+    data = _create_eip712_market_member_login(member, client_pubkey)
+
+    return sign(eth_privkey, data)
+
+
+def recover_eip712_market_member_login(member: bytes, client_pubkey: bytes, signature: bytes) -> bytes:
+    assert is_signature(signature)
+
+    data = _create_eip712_market_member_login(member, client_pubkey)
+
+    return recover(data, signature)