diff --git a/connect-peers.sh b/connect-peers.sh
index dc1c4216..e091037b 100755
--- a/connect-peers.sh
+++ b/connect-peers.sh
@@ -318,12 +318,19 @@ check_rpc_success() {
     return 1
 }
 
-# Function to detect client type from node name
+# Function to detect client type from node name (+ optional compose path hint).
+# op-geth often still reports admin_nodeInfo.name as "Geth/…", so the compose
+# path (…/op-geth/… or *-op-geth-*) is the reliable signal.
 detect_client_type() {
     local node_name="$1"
+    local compose_hint="${2:-}"
     local name_lower=$(echo "$node_name" | tr '[:upper:]' '[:lower:]')
-    
-    if [[ "$name_lower" == *"geth"* ]]; then
+    local hint_lower=$(echo "$compose_hint" | tr '[:upper:]' '[:lower:]')
+
+    # op-geth lacks admin_addStaticPeer — must use admin_addPeer
+    if [[ "$name_lower" == *"op-geth"* ]] || [[ "$hint_lower" == *"op-geth"* ]]; then
+        echo "op-geth"
+    elif [[ "$name_lower" == *"geth"* ]]; then
         echo "geth"
     elif [[ "$name_lower" == *"reth"* ]]; then
         echo "reth"
@@ -346,12 +353,12 @@ add_static_peer() {
     local response
     local method
     
-    # Determine which method to try first based on client type
+    # Determine which method to try first based on client type.
+    # Only vanilla geth supports admin_addStaticPeer; op-geth does not.
     if [[ "$client_type" == "geth" ]]; then
-        # Geth supports admin_addStaticPeer
         method="admin_addStaticPeer"
     else
-        # Reth and most other clients use admin_addPeer
+        # op-geth, reth, and most other clients use admin_addPeer
         method="admin_addPeer"
     fi
     
@@ -364,10 +371,11 @@ add_static_peer() {
         return 1
     }
     
-    # Check if method not found, try fallback
-    if echo "$response" | grep -qi "method not found"; then
+    # Fallback when the primary method is unsupported. go-ethereum-style errors
+    # say "the method X does not exist/is not available", not "method not found".
+    if echo "$response" | grep -qiE 'method not found|does not exist|not available|-32601'; then
         if [[ "$method" == "admin_addStaticPeer" ]]; then
-            # Try admin_addPeer as fallback
+            # Try admin_addPeer as fallback (required for op-geth)
             method="admin_addPeer"
             response=$(curl --ipv4 -s -X POST "$url" \
                 -H "Content-Type: application/json" \
@@ -425,7 +433,7 @@ echo -e "${GREEN}OK${NC}"
 SOURCE_ENODE=$(extract_enode "$SOURCE_INFO")
 SOURCE_NAME=$(extract_name "$SOURCE_INFO")
 SOURCE_PUBKEY=$(echo "$SOURCE_ENODE" | sed -E 's|enode://([^@]+)@.*|\1|')
-SOURCE_CLIENT=$(detect_client_type "$SOURCE_NAME")
+SOURCE_CLIENT=$(detect_client_type "$SOURCE_NAME" "$COMPOSE_FILE")
 
 if [[ -z "$SOURCE_ENODE" ]]; then
     echo -e "${RED}Could not extract enode from source${NC}"
@@ -457,7 +465,7 @@ echo -e "${GREEN}OK${NC}"
 TARGET_ENODE=$(extract_enode "$TARGET_INFO")
 TARGET_NAME=$(extract_name "$TARGET_INFO")
 TARGET_PUBKEY=$(echo "$TARGET_ENODE" | sed -E 's|enode://([^@]+)@.*|\1|')
-TARGET_CLIENT=$(detect_client_type "$TARGET_NAME")
+TARGET_CLIENT=$(detect_client_type "$TARGET_NAME" "$TARGET_COMPOSE_FILE")
 
 if [[ -z "$TARGET_ENODE" ]]; then
     echo -e "${RED}Could not extract enode from target${NC}"
diff --git a/peer-capture.sh b/peer-capture.sh
index bd627d9d..ae78ee90 100755
--- a/peer-capture.sh
+++ b/peer-capture.sh
@@ -78,16 +78,21 @@ CLIENT_NAME="$(echo "$INFO" | jq -r '.result.name // empty' 2>/dev/null || true)
 PEERS_JSON="$(rpc admin_peers)"
 PEER_COUNT="$(echo "$PEERS_JSON" | jq -r '.result | length' 2>/dev/null || echo 0)"
 
-# Detect client type (connect-peers.sh logic)
+# Detect client type (connect-peers.sh logic).
+# op-geth often still reports as "Geth/…" — prefer compose path for op-geth.
 NAME_LC="$(echo "$CLIENT_NAME" | tr '[:upper:]' '[:lower:]')"
 CLIENT_TYPE="unknown"
 case "$NAME_LC" in
+    *op-geth*) CLIENT_TYPE="op-geth" ;;
     *geth*) CLIENT_TYPE="geth" ;;
     *reth*) CLIENT_TYPE="reth" ;;
     *erigon*) CLIENT_TYPE="erigon" ;;
     *nethermind*) CLIENT_TYPE="nethermind" ;;
     *besu*) CLIENT_TYPE="besu" ;;
 esac
+case "$COMPOSE_PATH" in
+    *op-geth*) CLIENT_TYPE="op-geth" ;;
+esac
 
 TS="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
 echo "$PEERS_JSON" | jq -c --arg path "$COMPOSE_PATH" --arg ts "$TS" \
diff --git a/peer-reinject.sh b/peer-reinject.sh
index 7643bbe7..dfcb5378 100755
--- a/peer-reinject.sh
+++ b/peer-reinject.sh
@@ -1,7 +1,8 @@
 #!/bin/bash
 # peer-reinject.sh — generic .after-start hook: re-seed peers from peer-capture state.
-# Uses admin_addStaticPeer for geth, admin_addPeer otherwise (connect-peers.sh).
-# In-network vantage (rpc_chains). Idempotent; best-effort (never fails the restart).
+# Uses admin_addStaticPeer for vanilla geth, admin_addPeer for op-geth and others
+# (connect-peers.sh). In-network vantage (rpc_chains). Idempotent; best-effort
+# (never fails the restart).
 #
 # Seed order (one path for us and customers):
 #   1. Own persisted peerset (peer-state/<compose>.json from peer-capture)
@@ -68,6 +69,12 @@ if [ "${#ENODES[@]}" -eq 0 ]; then
     exit 0
 fi
 
+# op-geth lacks admin_addStaticPeer; compose path wins over stale capture state
+# that classified the node as plain "geth" (admin_nodeInfo often still says Geth).
+case "$COMPOSE_PATH" in
+    *op-geth*) CLIENT_TYPE="op-geth" ;;
+esac
+
 BASE="$(basename "$COMPOSE_PATH" | sed 's/--.*//')"
 EL=""
 # wait briefly for container after recreate
@@ -120,6 +127,7 @@ done
 add_peer() {
     local enode="$1"
     local method
+    # Only vanilla geth supports admin_addStaticPeer; op-geth must use admin_addPeer
     if [ "$CLIENT_TYPE" = "geth" ]; then
         method="admin_addStaticPeer"
     else
@@ -132,7 +140,8 @@ add_peer() {
     resp="$(docker exec peer-hook-probe curl -s --max-time 8 -X POST \
         -H 'Content-Type: application/json' --data "$payload" \
         "http://${IP}:8545" 2>/dev/null || true)"
-    if echo "$resp" | grep -qi 'method not found'; then
+    # go-ethereum-style: "the method X does not exist/is not available" (not "method not found")
+    if echo "$resp" | grep -qiE 'method not found|does not exist|not available|-32601'; then
         if [ "$method" = "admin_addStaticPeer" ]; then
             method="admin_addPeer"
         else