diff --git a/core/core.js b/core/core.js
index 383222fb..db9031bd 100644
--- a/core/core.js
+++ b/core/core.js
@@ -23,13 +23,18 @@ const k_global_settings = {
 	room: {
 		type: 'boolean',
 		default_value: true,
-		description: 'Whether this instance should behave as a room.',
+		description: 'Enable peers to tunnel through this instance as a room.',
 	},
 	room_name: {
 		type: 'string',
 		default_value: 'tilde friends tunnel',
 		description: 'Name of the room.',
 	},
+	replicator: {
+		type: 'boolean',
+		default_value: true,
+		description: 'Enable message and blob replication.',
+	},
 	code_of_conduct: {
 		type: 'textarea',
 		default_value: undefined,
diff --git a/src/ssb.c b/src/ssb.c
index 38d58b00..12087c25 100644
--- a/src/ssb.c
+++ b/src/ssb.c
@@ -265,6 +265,7 @@ typedef struct _tf_ssb_t
 
 	uv_thread_t thread_self;
 	bool is_room;
+	bool is_replicator;
 	char* room_name;
 	char seeds_host[256];
 	time_t last_seed_check;
@@ -2196,6 +2197,7 @@ tf_ssb_t* tf_ssb_create(uv_loop_t* loop, JSContext* context, const char* db_path
 {
 	tf_ssb_t* ssb = tf_malloc(sizeof(tf_ssb_t));
 	memset(ssb, 0, sizeof(*ssb));
+	ssb->is_replicator = true;
 
 	const char* actual_key = network_key ? network_key : k_ssb_network_string;
 	if (sodium_hex2bin(ssb->network_key, sizeof(ssb->network_key), actual_key, strlen(actual_key), ": ", NULL, NULL))
@@ -3997,6 +3999,16 @@ const char* tf_ssb_get_room_name(tf_ssb_t* ssb)
 	return ssb->room_name;
 }
 
+bool tf_ssb_is_replicator(tf_ssb_t* ssb)
+{
+	return ssb->is_replicator;
+}
+
+void tf_ssb_set_is_replicator(tf_ssb_t* ssb, bool is_replicator)
+{
+	ssb->is_replicator = is_replicator;
+}
+
 void tf_ssb_set_room_name(tf_ssb_t* ssb, const char* room_name)
 {
 	tf_free(ssb->room_name);
diff --git a/src/ssb.h b/src/ssb.h
index 2a84fac4..ab2f4cf7 100644
--- a/src/ssb.h
+++ b/src/ssb.h
@@ -41,6 +41,9 @@ typedef enum _tf_ssb_change_t
 	k_tf_ssb_change_update,
 } tf_ssb_change_t;
 
+/**
+** The origin of a broadcast entry.
+*/
 typedef enum _tf_ssb_broadcast_origin_t
 {
 	k_tf_ssb_broadcast_origin_discovery,
@@ -972,6 +975,20 @@ bool tf_ssb_is_room(tf_ssb_t* ssb);
 */
 void tf_ssb_set_is_room(tf_ssb_t* ssb, bool is_room);
 
+/**
+** Get whether the running server supports replication of messages and blobs.
+** @param ssb The SSB instance.
+** @return True if the server is a replicator.
+*/
+bool tf_ssb_is_replicator(tf_ssb_t* ssb);
+
+/**
+** Set whether the running server supports replication of messages and blobs.
+** @param ssb The SSB instance.
+** @param is_replicator Whether to support replication.
+*/
+void tf_ssb_set_is_replicator(tf_ssb_t* ssb, bool is_replicator);
+
 /**
 ** Get the name of the room hosted by the running server.
 ** @param ssb The SSB instance.
diff --git a/src/ssb.rpc.c b/src/ssb.rpc.c
index d4470cea..9f38b8cf 100644
--- a/src/ssb.rpc.c
+++ b/src/ssb.rpc.c
@@ -107,6 +107,12 @@ static void _tf_ssb_rpc_blobs_get(tf_ssb_connection_t* connection, uint8_t flags
 	{
 		return;
 	}
+	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
+	if (!tf_ssb_is_replicator(ssb))
+	{
+		tf_ssb_connection_rpc_send_error_method_not_allowed(connection, flags, -request_number, "blobs.get");
+		return;
+	}
 
 	tf_ssb_connection_add_request(connection, -request_number, "blobs.get", _tf_ssb_rpc_blobs_get_callback, NULL, NULL, NULL);
 	JSContext* context = tf_ssb_connection_get_context(connection);
@@ -144,6 +150,11 @@ static void _tf_ssb_rpc_blobs_get(tf_ssb_connection_t* connection, uint8_t flags
 static void _tf_ssb_rpc_blobs_has(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
 {
 	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
+	if (!tf_ssb_is_replicator(ssb))
+	{
+		tf_ssb_connection_rpc_send_error_method_not_allowed(connection, flags, -request_number, "blobs.has");
+		return;
+	}
 	JSContext* context = tf_ssb_connection_get_context(connection);
 	JSValue ids = JS_GetPropertyStr(context, args, "args");
 	JSValue id = JS_GetPropertyUint32(context, ids, 0);
@@ -242,8 +253,13 @@ static void _tf_ssb_rpc_request_more_blobs(tf_ssb_connection_t* connection)
 static void _tf_ssb_rpc_blobs_createWants(
 	tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
 {
-	tf_ssb_blob_wants_t* blob_wants = tf_ssb_connection_get_blob_wants_state(connection);
 	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
+	if (!tf_ssb_is_replicator(ssb))
+	{
+		tf_ssb_connection_rpc_send_error_method_not_allowed(connection, flags, -request_number, "blobs.createWants");
+		return;
+	}
+	tf_ssb_blob_wants_t* blob_wants = tf_ssb_connection_get_blob_wants_state(connection);
 	tf_ssb_add_blob_want_added_callback(ssb, _tf_ssb_rpc_blob_wants_added_callback, NULL, connection);
 	blob_wants->request_number = request_number;
 	_tf_ssb_rpc_request_more_blobs(connection);
@@ -855,6 +871,11 @@ static void _tf_ssb_rpc_createHistoryStream(
 	tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
 {
 	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
+	if (!tf_ssb_is_replicator(ssb))
+	{
+		tf_ssb_connection_rpc_send_error_method_not_allowed(connection, flags, -request_number, "createHistoryStream");
+		return;
+	}
 	JSContext* context = tf_ssb_get_context(ssb);
 	JSValue arg_array = JS_GetPropertyStr(context, args, "args");
 	JSValue arg = JS_GetPropertyUint32(context, arg_array, 0);
@@ -1157,6 +1178,12 @@ static void _tf_ssb_rpc_ebt_replicate_server(
 	{
 		return;
 	}
+	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
+	if (!tf_ssb_is_replicator(ssb))
+	{
+		tf_ssb_connection_rpc_send_error_method_not_allowed(connection, flags, -request_number, "ebt.replicate");
+		return;
+	}
 	_tf_ssb_rpc_ebt_replicate(connection, flags, request_number, args, message, size, user_data);
 	tf_ssb_connection_add_request(connection, -request_number, "ebt.replicate", _tf_ssb_rpc_ebt_replicate, NULL, NULL, NULL);
 }
@@ -1189,7 +1216,10 @@ static void _tf_ssb_rpc_connections_changed_callback(tf_ssb_t* ssb, tf_ssb_chang
 				_tf_ssb_rpc_connection_tunnel_isRoom_callback, NULL, NULL);
 			JS_FreeValue(context, message);
 
-			_tf_ssb_rpc_send_ebt_replicate(connection);
+			if (tf_ssb_is_replicator(ssb))
+			{
+				_tf_ssb_rpc_send_ebt_replicate(connection);
+			}
 		}
 	}
 	else if (change == k_tf_ssb_change_remove)