diff --git a/src/client/api/rest/controller.go b/src/client/api/rest/controller.go
index acd8de0..47fbf12 100644
--- a/src/client/api/rest/controller.go
+++ b/src/client/api/rest/controller.go
@@ -329,11 +329,15 @@ func (cont *Controller) GetLogs(ctx *gin.Context) {
 }
 
 // AllMessages godoc
-// @Summary List all FIX application messages of the day
-// @Description Returns every FIX application message recorded today (no admin: heartbeats/logon/logout/etc.), sorted by CreatedAt ascending
+// @Summary List FIX application messages of the day after the caller's last-seen sequence
+// @Description Returns today's FIX application messages (no admin: heartbeats/logon/logout/etc.) with MsgSeqNum greater than the caller's last-seen sequence per direction. "In" is the last MsgSeqNum the caller received on the IN side; "Out" is the same for OUT. Pass 0 to receive everything on that side. Sorted by CreatedAt ascending.
 // @Tags fix
+// @Accept json
 // @Produce json
+// @Param body body AllMessagesRequest true "API key and last-seen MsgSeqNum per direction"
 // @Success 200 {array} domain.Message
+// @Failure 400 {object} HTTPError
+// @Failure 401 {object} HTTPError
 // @Router /qfixdpl/v1/messages [post]
 func (cont *Controller) AllMessages(ctx *gin.Context) {
 	setHeaders(ctx, cont.config)
@@ -349,7 +353,7 @@ func (cont *Controller) AllMessages(ctx *gin.Context) {
 		return
 	}
 
-	ctx.JSON(http.StatusOK, cont.tradeProvider.GetAllMessages())
+	ctx.JSON(http.StatusOK, cont.tradeProvider.GetAllMessages(req.In, req.Out))
 }
 
 // GetPendingQuoteRequests godoc
diff --git a/src/client/api/rest/model.go b/src/client/api/rest/model.go
index d831c82..f136d39 100644
--- a/src/client/api/rest/model.go
+++ b/src/client/api/rest/model.go
@@ -24,4 +24,6 @@ type SendQuoteRequest struct {
 
 type AllMessagesRequest struct {
 	APIKey string
+	In     int
+	Out    int
 }
diff --git a/src/client/api/rest/server.go b/src/client/api/rest/server.go
index 80ff45c..7e36bf1 100644
--- a/src/client/api/rest/server.go
+++ b/src/client/api/rest/server.go
@@ -22,7 +22,7 @@ type TradeProvider interface {
 	GetTrades() []domain.ListTrade
 	GetPendingQuoteRequests() []domain.ListTrade
 	SendQuote(quoteReqID string, price decimal.Decimal) error
-	GetAllMessages() []domain.Message
+	GetAllMessages(inSeq, outSeq int) []domain.Message
 }
 
 const RedisMaxIdle = 3000 // In ms
diff --git a/src/client/fix/manager.go b/src/client/fix/manager.go
index 935fab1..5d1c7b2 100644
--- a/src/client/fix/manager.go
+++ b/src/client/fix/manager.go
@@ -598,17 +598,29 @@ func (m *Manager) handleRawMessage(direction string, msg *quickfix.Message) {
 	m.messagesMu.Unlock()
 }
 
-// GetAllMessages returns a snapshot of every FIX application message recorded today,
-// sorted ascending by CreatedAt.
-func (m *Manager) GetAllMessages() []domain.Message {
+// GetAllMessages returns today's FIX application messages with MsgSeqNum greater than
+// the caller's last-seen sequence per direction (inSeq for IN, outSeq for OUT), sorted
+// ascending by CreatedAt. Passing 0 for either cursor returns all messages on that side.
+func (m *Manager) GetAllMessages(inSeq, outSeq int) []domain.Message {
 	m.messagesMu.RLock()
-	out := make([]domain.Message, len(m.messages))
-	copy(out, m.messages)
+	filtered := make([]domain.Message, 0, len(m.messages))
+	for _, msg := range m.messages {
+		switch msg.JMessage.Direction {
+		case "IN":
+			if msg.MsgSeqNum > inSeq {
+				filtered = append(filtered, msg)
+			}
+		case "OUT":
+			if msg.MsgSeqNum > outSeq {
+				filtered = append(filtered, msg)
+			}
+		}
+	}
 	m.messagesMu.RUnlock()
 
-	sort.Slice(out, func(i, j int) bool { return out[i].CreatedAt.Before(out[j].CreatedAt) })
+	sort.Slice(filtered, func(i, j int) bool { return filtered[i].CreatedAt.Before(filtered[j].CreatedAt) })
 
-	return out
+	return filtered
 }
 
 // loadTodayMessages rebuilds the in-memory message list from today's rows in the DB.