API v1 500 error convert to 404, if just path is incorrect

CHANGELOG.md

@@ -57,6 +57,7 @@
 
 ### Fixes
 
+- [#8187](https://github.com/blockscout/blockscout/pull/8187) - API v1 500 error convert to 404, if requested path is incorrect
 - [#7852](https://github.com/blockscout/blockscout/pull/7852) - Token balances refactoring & fixes
 - [#7872](https://github.com/blockscout/blockscout/pull/7872) - Fix pending gas price in pending tx
 - [#7875](https://github.com/blockscout/blockscout/pull/7875) - Fix twin compiler version

apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/rpc_translator.ex

@@ -29,7 +29,7 @@ defmodule BlockScoutWeb.API.RPC.RPCTranslator do
   end
 
   def call(%Conn{params: %{"module" => module, "action" => action}} = conn, translations) do
-    with true <- valid_api_request_path(conn),
+    with {:valid_api_request, true} <- {:valid_api_request, valid_api_request_path(conn)},
          {:ok, {controller, write_actions}} <- translate_module(translations, module),
          {:ok, action} <- translate_action(action),
          true <- action_accessed?(action, write_actions),
@@ -58,6 +58,13 @@ defmodule BlockScoutWeb.API.RPC.RPCTranslator do
       :rate_limit_reached ->
         AccessHelper.handle_rate_limit_deny(conn)
 
+      {:valid_api_request, false} ->
+        conn
+        |> put_status(404)
+        |> put_view(RPCView)
+        |> Controller.render(:error, error: "Not found")
+        |> halt()
+
       _ ->
         conn
         |> put_status(500)
@@ -119,7 +126,8 @@ defmodule BlockScoutWeb.API.RPC.RPCTranslator do
   end
 
   defp valid_api_request_path(conn) do
-    if conn.request_path == "/api" || conn.request_path == "/api/v1" do
+    if conn.request_path == "/api" || conn.request_path == "/api/" || conn.request_path == "/api/v1" ||
+         conn.request_path == "/api/v1/" do
       true
     else
       false