diff --git a/client_manager.py b/client_manager.py
index 07c3cd5..8bd0c11 100644
--- a/client_manager.py
+++ b/client_manager.py
@@ -1,5 +1,5 @@
 import json
-from typing import Any, Callable, List, Optional
+from typing import Any, Awaitable, Callable, List, Optional
 
 from fastapi import WebSocket
 from loguru import logger
@@ -12,7 +12,7 @@ from .crud import (
     get_events,
     mark_events_deleted,
 )
-from .models import NostrEvent, NostrEventType, NostrFilter, RelayConfig
+from .models import ClientConfig, NostrEvent, NostrEventType, NostrFilter, RelayConfig
 
 
 class NostrClientManager:
@@ -28,7 +28,12 @@ class NostrClientManager:
         allow_connect = await self._allow_client(client)
         if not allow_connect:
             return False
+
         setattr(client, "broadcast_event", self.broadcast_event)
+        def get_client_config() -> ClientConfig:
+            return self.get_relay_config(client.relay_id)
+        setattr(client, "get_client_config", get_client_config)
+
         self.clients(client.relay_id).append(client)
 
         return True
@@ -52,18 +57,20 @@ class NostrClientManager:
     async def disable_relay(self, relay_id: str):
         await self._stop_clients_for_relay(relay_id)
         del self._active_relays[relay_id]
+
+    def get_relay_config(self, relay_id: str) -> RelayConfig:
+        return self._active_relays[relay_id]
             
+    def clients(self, relay_id: str) -> List["NostrClientConnection"]:
+        if relay_id not in self._clients:
+            self._clients[relay_id] = []
+        return self._clients[relay_id]
 
     async def _stop_clients_for_relay(self, relay_id: str):
         for client in self.clients(relay_id):
             if client.relay_id == relay_id:
                 await client.stop(reason=f"Relay '{relay_id}' has been deactivated.")
 
-    def clients(self, relay_id: str) -> List["NostrClientConnection"]:
-        if relay_id not in self._clients:
-            self._clients[relay_id] = []
-        return self._clients[relay_id]
-
     async def _allow_client(self, c: "NostrClientConnection") -> bool:
         if c.relay_id not in self._active_relays:
             await c.stop(reason=f"Relay '{c.relay_id}' is not active")
@@ -77,7 +84,8 @@ class NostrClientConnection:
         self.websocket = websocket
         self.relay_id = relay_id
         self.filters: List[NostrFilter] = []
-        self.broadcast_event: Optional[Callable] = None
+        self.broadcast_event: Optional[Callable[[NostrClientConnection, NostrEvent], Awaitable[None]]] = None
+        self.get_client_config: Optional[Callable[[], ClientConfig]] = None
 
     async def start(self):
         await self.websocket.accept()
@@ -134,6 +142,10 @@ class NostrClientConnection:
         resp_nip20: List[Any] = ["OK", e.id]
         try:
             e.check_signature()
+
+            if not self.client_config.is_author_allowed(e.pubkey):
+                raise ValueError(f"Public key '{e.pubkey}' is not allowed in relay '{self.relay_id}'!")
+            
             if e.is_replaceable_event():
                 await delete_events(
                     self.relay_id, NostrFilter(kinds=[e.kind], authors=[e.pubkey])
@@ -144,7 +156,9 @@ class NostrClientConnection:
             if e.is_delete_event():
                 await self._handle_delete_event(e)
             resp_nip20 += [True, ""]
-        except ValueError:
+        except ValueError as ex:
+            #todo: handle the other Value Errors
+            logger.debug(ex)
             resp_nip20 += [False, "invalid: wrong event `id` or `sig`"]
         except Exception as ex:
             logger.debug(ex)
@@ -154,6 +168,12 @@ class NostrClientConnection:
 
         await self.websocket.send_text(json.dumps(resp_nip20))
 
+    @property
+    def client_config(self) -> ClientConfig:
+        if not self.get_client_config:
+                raise Exception("Client not ready!")
+        return self.get_client_config()
+
     async def _handle_delete_event(self, event: NostrEvent):
         # NIP 09
         filter = NostrFilter(authors=[event.pubkey])
diff --git a/models.py b/models.py
index 655538f..57e639a 100644
--- a/models.py
+++ b/models.py
@@ -8,12 +8,19 @@ from pydantic import BaseModel, Field
 from secp256k1 import PublicKey
 
 
-
 class ClientConfig(BaseModel):
     max_client_filters = Field(0, alias="maxClientFilters")
     allowed_public_keys = Field([], alias="allowedPublicKeys")
     blocked_public_keys = Field([], alias="blockedPublicKeys")
 
+    def is_author_allowed(self, p: str) -> bool:
+        if p in self.blocked_public_keys:
+            return False
+        if len(self.allowed_public_keys) == 0:
+            return True
+        # todo: check payment
+        return p in self.allowed_public_keys
+        
     class Config:
         allow_population_by_field_name = True
 class RelayConfig(ClientConfig):