diff --git a/clients/besu/besu.sh b/clients/besu/besu.sh
index e1f862fa93..13d7258bb8 100644
--- a/clients/besu/besu.sh
+++ b/clients/besu/besu.sh
@@ -152,13 +152,13 @@ FLAGS="$FLAGS --snapsync-server-enabled"
 # Configure RPC.
 RPCFLAGS="--host-allowlist=*"
 if [ "$HIVE_GRAPHQL_ENABLED" == "" ]; then
-    RPCFLAGS="$RPCFLAGS --rpc-http-enabled --rpc-http-api=DEBUG,TRACE,ETH,NET,TXPOOL,WEB3,ADMIN --rpc-http-host=0.0.0.0"
+    RPCFLAGS="$RPCFLAGS --rpc-http-enabled --rpc-http-api=DEBUG,TRACE,ETH,NET,TXPOOL,WEB3,ADMIN,TESTING --rpc-http-host=0.0.0.0"
 else
     RPCFLAGS="$RPCFLAGS --graphql-http-enabled --graphql-http-host=0.0.0.0 --graphql-http-port=8545"
 fi
 
 # Enable WebSocket.
-RPCFLAGS="$RPCFLAGS --rpc-ws-enabled --rpc-ws-api=DEBUG,TRACE,ETH,NET,TXPOOL,WEB3,ADMIN --rpc-ws-host=0.0.0.0"
+RPCFLAGS="$RPCFLAGS --rpc-ws-enabled --rpc-ws-api=DEBUG,TRACE,ETH,NET,TXPOOL,WEB3,ADMIN,TESTING --rpc-ws-host=0.0.0.0"
 
 # Enable merge support if needed
 if [ "$HIVE_TERMINAL_TOTAL_DIFFICULTY" != "" ]; then
diff --git a/clients/erigon/erigon.sh b/clients/erigon/erigon.sh
index 3d61c01e67..a5ea247b47 100644
--- a/clients/erigon/erigon.sh
+++ b/clients/erigon/erigon.sh
@@ -127,7 +127,7 @@ if [ "$HIVE_CLIQUE_PRIVATEKEY" != "" ]; then
 fi
 
 # Configure RPC.
-FLAGS="$FLAGS --http --http.addr=0.0.0.0 --http.api=admin,debug,trace,eth,net,txpool,web3"
+FLAGS="$FLAGS --http --http.addr=0.0.0.0 --http.api=admin,debug,trace,eth,net,txpool,web3,testing"
 FLAGS="$FLAGS --ws --ws.port=8546"
 
 # Increase blob slots for tests
diff --git a/clients/go-ethereum/geth.sh b/clients/go-ethereum/geth.sh
index 5d893140de..19831a196c 100644
--- a/clients/go-ethereum/geth.sh
+++ b/clients/go-ethereum/geth.sh
@@ -138,8 +138,8 @@ if [ "$HIVE_MINER_EXTRA" != "" ]; then
 fi
 
 # Configure RPC.
-FLAGS="$FLAGS --http --http.addr=0.0.0.0 --http.port=8545 --http.api=admin,debug,eth,miner,net,txpool,web3"
-FLAGS="$FLAGS --ws --ws.addr=0.0.0.0 --ws.origins \"*\" --ws.api=admin,debug,eth,miner,net,txpool,web3"
+FLAGS="$FLAGS --http --http.addr=0.0.0.0 --http.port=8545 --http.api=admin,debug,eth,miner,net,txpool,web3,testing"
+FLAGS="$FLAGS --ws --ws.addr=0.0.0.0 --ws.origins \"*\" --ws.api=admin,debug,eth,miner,net,txpool,web3,testing"
 
 if [ "$HIVE_TERMINAL_TOTAL_DIFFICULTY" != "" ]; then
     echo "0x7365637265747365637265747365637265747365637265747365637265747365" > /jwtsecret
diff --git a/clients/nethermind/test.json b/clients/nethermind/test.json
index e5bcf080ab..c1de09f20f 100644
--- a/clients/nethermind/test.json
+++ b/clients/nethermind/test.json
@@ -21,7 +21,8 @@
       "Net",
       "Parity",
       "Health",
-      "Rpc"
+      "Rpc",
+      "Testing"
     ]
   },
   "Network": {
diff --git a/clients/reth/reth.sh b/clients/reth/reth.sh
index 9b61a04e1b..d8e90c19ee 100644
--- a/clients/reth/reth.sh
+++ b/clients/reth/reth.sh
@@ -153,8 +153,8 @@ if [ -n "${HIVE_CLIQUE_PRIVATEKEY}" ] || [ -n "${HIVE_CLIQUE_PERIOD}" ]; then
 fi
 
 # Configure RPC.
-FLAGS="$FLAGS --http --http.addr=0.0.0.0 --http.api=admin,debug,trace,eth,net,txpool,web3"
-FLAGS="$FLAGS --ws --ws.addr=0.0.0.0 --ws.api=admin,debug,trace,eth,net,txpool,web3"
+FLAGS="$FLAGS --http --http.addr=0.0.0.0 --http.api=admin,debug,trace,eth,net,txpool,web3,testing"
+FLAGS="$FLAGS --ws --ws.addr=0.0.0.0 --ws.api=admin,debug,trace,eth,net,txpool,web3,testing"
 
 if [ "$HIVE_TERMINAL_TOTAL_DIFFICULTY" != "" ]; then
     JWT_SECRET="7365637265747365637265747365637265747365637265747365637265747365"