diff --git a/include/ircd/m/room/state.h b/include/ircd/m/room/state.h
index ad4cb5f92..5defe28e7 100644
--- a/include/ircd/m/room/state.h
+++ b/include/ircd/m/room/state.h
@@ -69,6 +69,7 @@ struct ircd::m::room::state
 	// Existential
 	bool has(const string_view &type, const string_view &state_key) const;
 	bool has(const string_view &type) const;
+	bool has(const event::idx &) const;
 
 	// Fetch a state event
 	bool get(std::nothrow_t, const string_view &type, const string_view &state_key, const event::closure_idx &) const;
@@ -95,6 +96,7 @@ struct ircd::m::room::state
 	static event::idx next(const event::idx &);
 
 	static size_t prefetch(const state &, const string_view &, const event::idx_range &);
+	static bool present(const event::idx &);
 	static size_t rebuild_present(const room::id &);
 	static bool force_present(const event &);
 	static size_t purge_replaced(const room::id &);
diff --git a/ircd/m_room.cc b/ircd/m_room.cc
index 327232131..1edf2ce91 100644
--- a/ircd/m_room.cc
+++ b/ircd/m_room.cc
@@ -170,6 +170,38 @@ ircd::m::room::state::rebuild_present(const room::id &room_id)
 	return ret;
 }
 
+bool
+ircd::m::room::state::present(const event::idx &event_idx)
+{
+	static const event::fetch::opts fopts
+	{
+		event::keys::include { "room_id", "type", "state_key" },
+	};
+
+	const m::event::fetch event
+	{
+		event_idx, fopts
+	};
+
+	const m::room room
+	{
+		at<"room_id"_>(event)
+	};
+
+	const m::room::state state
+	{
+		room
+	};
+
+	const auto state_idx
+	{
+		state.get(std::nothrow, at<"type"_>(event), at<"state_key"_>(event))
+	};
+
+	assert(event_idx);
+	return state_idx == event_idx;
+}
+
 size_t
 ircd::m::room::state::prefetch(const state &state,
                                const string_view &type,
@@ -2141,6 +2173,32 @@ const
 	});
 }
 
+bool
+ircd::m::room::state::has(const event::idx &event_idx)
+const
+{
+	static const event::fetch::opts fopts
+	{
+		event::keys::include { "type", "state_key" },
+	};
+
+	const m::event::fetch event
+	{
+		event_idx, std::nothrow, fopts
+	};
+
+	if(!event.valid)
+		return false;
+
+	const auto state_idx
+	{
+		get(std::nothrow, at<"type"_>(event), at<"state_key"_>(event))
+	};
+
+	assert(event_idx);
+	return event_idx == state_idx;
+}
+
 bool
 ircd::m::room::state::has(const string_view &type)
 const