diff --git a/packages/jsonrpc/src/express.test.ts b/packages/jsonrpc/src/express.test.ts
index 0a8583c..3527931 100644
--- a/packages/jsonrpc/src/express.test.ts
+++ b/packages/jsonrpc/src/express.test.ts
@@ -211,6 +211,13 @@ describe('jsonrpc', () => {
         },
       })
     })
+
+    it('cannot call non-idempotent methods using GET request', async () => {
+      const params = encodeURIComponent(JSON.stringify([1, 2]))
+      await request(createApp())
+      .get(`/myService?jsonrpc=2.0&id=1&method=add&params=${params}`)
+      .expect(405)
+    })
   })
 
 })
diff --git a/packages/jsonrpc/src/express.ts b/packages/jsonrpc/src/express.ts
index 863eb99..9b49935 100644
--- a/packages/jsonrpc/src/express.ts
+++ b/packages/jsonrpc/src/express.ts
@@ -6,7 +6,9 @@ import {ILogger} from '@rondo/common'
 import {ISuccessResponse} from './jsonrpc'
 import {NextFunction, Request, Response, Router} from 'express'
 import {createError, isJSONRPCError, IJSONRPCError, IError} from './error'
-import {createRpcService, ERROR_SERVER, ERROR_INVALID_PARAMS} from './jsonrpc'
+import {
+  createRpcService, ERROR_SERVER, ERROR_INVALID_PARAMS, ERROR_METHOD_NOT_FOUND,
+} from './jsonrpc'
 
 export type TGetContext<Context> = (req: Request) => Context
 
@@ -69,10 +71,10 @@ export function jsonrpc<Context>(
       router.get('/', (req, res, next) => {
         if (!idempotentMethodRegex.test(req.query.method)) {
           // TODO fix status code and error type
-          const err = createError(ERROR_SERVER, {
+          const err = createError(ERROR_METHOD_NOT_FOUND, {
             id: req.query.id,
             data: null,
-            statusCode: 400,
+            statusCode: 405,
           })
           throw err
         }
diff --git a/packages/jsonrpc/src/jsonrpc.ts b/packages/jsonrpc/src/jsonrpc.ts
index 46eeb11..04b703d 100644
--- a/packages/jsonrpc/src/jsonrpc.ts
+++ b/packages/jsonrpc/src/jsonrpc.ts
@@ -85,7 +85,6 @@ export const createRpcService = <T, M extends FunctionPropertyNames<T>>(
         typeof method !== 'string' ||
         !Array.isArray(params)
       ) {
-        console.log(req.jsonrpc, method, params)
         throw createError(ERROR_INVALID_REQUEST, {
           id,
           data: null,
diff --git a/packages/jsonrpc/src/remote.ts b/packages/jsonrpc/src/remote.ts
index 62a58b0..095e160 100644
--- a/packages/jsonrpc/src/remote.ts
+++ b/packages/jsonrpc/src/remote.ts
@@ -23,8 +23,8 @@ export function createRemoteClient<T>(
     method: string,
     params: any[],
   ) {
-    const reqMethod = IDEMPOTENT_METHOD_REGEX.test(method) ? 'get' : 'post'
-    const payloadKey = reqMethod === 'post' ? 'data' : 'params'
+    const reqMethod = IDEMPOTENT_METHOD_REGEX.test(method) ? 'GET' : 'POST'
+    const payloadKey = reqMethod === 'POST' ? 'data' : 'params'
 
     const response = await axios({
       method: reqMethod,
@@ -33,7 +33,7 @@ export function createRemoteClient<T>(
         id,
         jsonrpc: '2.0',
         method,
-        params: reqMethod === 'post'
+        params: reqMethod === 'POST'
           ? params
           : JSON.stringify(params),
       },