diff --git a/packages/client/bin/cli.ts b/packages/client/bin/cli.ts
index ec6fbdcc9d..fe43ee0292 100755
--- a/packages/client/bin/cli.ts
+++ b/packages/client/bin/cli.ts
@@ -204,8 +204,10 @@ const args: ClientOpts = yargs(hideBin(process.argv))
     default: 5,
   })
   .option('rpcDebug', {
-    describe: 'Additionally log complete RPC calls on log level debug (i.e. --loglevel=debug)',
-    boolean: true,
+    describe:
+      'Additionally log complete RPC calls on log level debug (i.e. --loglevel=debug). Can indicate a specific module or a boolean.',
+    choices: ['true', 'false', 'eth', 'engine'],
+    default: 'false',
   })
   .option('rpcCors', {
     describe: 'Configure the Access-Control-Allow-Origin CORS header for RPC server',
diff --git a/packages/client/bin/startRpc.ts b/packages/client/bin/startRpc.ts
index be03d94749..9a7e2fb85a 100644
--- a/packages/client/bin/startRpc.ts
+++ b/packages/client/bin/startRpc.ts
@@ -26,7 +26,7 @@ export type RPCArgs = {
   rpcEnginePort: number
   wsEngineAddr: string
   wsEnginePort: number
-  rpcDebug: boolean
+  rpcDebug: string
   helpRpc: boolean
   jwtSecret?: string
   rpcEngineAuth: boolean
diff --git a/packages/client/src/types.ts b/packages/client/src/types.ts
index ce96ecb37f..3de5998dba 100644
--- a/packages/client/src/types.ts
+++ b/packages/client/src/types.ts
@@ -129,7 +129,7 @@ export interface ClientOpts {
   logLevelFile?: string
   logRotate?: boolean
   logMaxFiles?: number
-  rpcDebug?: boolean
+  rpcDebug?: string
   rpcCors?: string
   maxPerRequest?: number
   maxFetcherJobs?: number
diff --git a/packages/client/src/util/rpc.ts b/packages/client/src/util/rpc.ts
index bdd00f8e6f..8ce6194156 100644
--- a/packages/client/src/util/rpc.ts
+++ b/packages/client/src/util/rpc.ts
@@ -17,7 +17,7 @@ const algorithm: TAlgorithm = 'HS256'
 
 type CreateRPCServerOpts = {
   methodConfig: MethodConfig
-  rpcDebug: boolean
+  rpcDebug: string
   logger?: Logger
 }
 type CreateRPCServerReturn = {
@@ -67,7 +67,11 @@ export function createRPCServer(
 
   const onRequest = (request: any) => {
     let msg = ''
-    if (rpcDebug) {
+    if (
+      rpcDebug === 'true' ||
+      (rpcDebug === 'engine' && request.method.includes('engine_') === true) ||
+      (rpcDebug === 'eth' && request.method.includes('eth_') === true)
+    ) {
       msg += `${request.method} called with params:\n${inspectParams(request.params)}`
     } else {
       msg += `${request.method} called with params: ${inspectParams(request.params, 125)}`
@@ -77,7 +81,11 @@ export function createRPCServer(
 
   const handleResponse = (request: any, response: any, batchAddOn = '') => {
     let msg = ''
-    if (rpcDebug) {
+    if (
+      rpcDebug === 'true' ||
+      (rpcDebug === 'engine' && request.method.includes('engine_') === true) ||
+      (rpcDebug === 'eth' && request.method.includes('eth_') === true)
+    ) {
       msg = `${request.method}${batchAddOn} responded with:\n${inspectParams(response)}`
     } else {
       msg = `${request.method}${batchAddOn} responded with: `
@@ -107,11 +115,11 @@ export function createRPCServer(
   }
 
   let methods
-  const ethMethods = manager.getMethods(false, rpcDebug)
+  const ethMethods = manager.getMethods(false, rpcDebug !== 'false')
 
   switch (methodConfig) {
     case MethodConfig.WithEngine:
-      methods = { ...ethMethods, ...manager.getMethods(true, rpcDebug) }
+      methods = { ...ethMethods, ...manager.getMethods(true, rpcDebug !== 'false') }
       break
     case MethodConfig.WithoutEngine:
       methods = { ...ethMethods }