diff --git a/dto/openai_response.go b/dto/openai_response.go
index 3a4c971b..38072673 100644
--- a/dto/openai_response.go
+++ b/dto/openai_response.go
@@ -107,7 +107,7 @@ type FunctionCall struct {
 	Name        string `json:"name,omitempty"`
 	// call function with arguments in JSON format
 	Parameters any    `json:"parameters,omitempty"` // request
-	Arguments  string `json:"arguments,omitempty"`
+	Arguments  string `json:"arguments"`
 }
 
 type ChatCompletionsStreamResponse struct {
diff --git a/relay/channel/gemini/relay-gemini.go b/relay/channel/gemini/relay-gemini.go
index 5db01c20..6f4cd10b 100644
--- a/relay/channel/gemini/relay-gemini.go
+++ b/relay/channel/gemini/relay-gemini.go
@@ -368,7 +368,7 @@ func responseGeminiChat2OpenAI(response *GeminiChatResponse) *dto.OpenAITextResp
 		Choices: make([]dto.OpenAITextResponseChoice, 0, len(response.Candidates)),
 	}
 	content, _ := json.Marshal("")
-	is_tool_call := false
+	isToolCall := false
 	for _, candidate := range response.Candidates {
 		choice := dto.OpenAITextResponseChoice{
 			Index: int(candidate.Index),
@@ -380,12 +380,12 @@ func responseGeminiChat2OpenAI(response *GeminiChatResponse) *dto.OpenAITextResp
 		}
 		if len(candidate.Content.Parts) > 0 {
 			var texts []string
-			var tool_calls []dto.ToolCall
+			var toolCalls []dto.ToolCall
 			for _, part := range candidate.Content.Parts {
 				if part.FunctionCall != nil {
 					choice.FinishReason = constant.FinishReasonToolCalls
 					if call := getToolCall(&part); call != nil {
-						tool_calls = append(tool_calls, *call)
+						toolCalls = append(toolCalls, *call)
 					}
 				} else {
 					if part.ExecutableCode != nil {
@@ -400,9 +400,9 @@ func responseGeminiChat2OpenAI(response *GeminiChatResponse) *dto.OpenAITextResp
 					}
 				}
 			}
-			if len(tool_calls) > 0 {
-				choice.Message.SetToolCalls(tool_calls)
-				is_tool_call = true
+			if len(toolCalls) > 0 {
+				choice.Message.SetToolCalls(toolCalls)
+				isToolCall = true
 			}
 
 			choice.Message.SetStringContent(strings.Join(texts, "\n"))
@@ -418,7 +418,7 @@ func responseGeminiChat2OpenAI(response *GeminiChatResponse) *dto.OpenAITextResp
 				choice.FinishReason = constant.FinishReasonContentFilter
 			}
 		}
-		if is_tool_call {
+		if isToolCall {
 			choice.FinishReason = constant.FinishReasonToolCalls
 		}
 
diff --git a/relay/constant/api_type.go b/relay/constant/api_type.go
index f7a87536..8ccfee03 100644
--- a/relay/constant/api_type.go
+++ b/relay/constant/api_type.go
@@ -30,6 +30,7 @@ const (
 	APITypeMokaAI
 	APITypeVolcEngine
 	APITypeBaiduV2
+	APITypeOpenRouter
 	APITypeDummy // this one is only for count, do not add any channel after this
 )
 
@@ -86,6 +87,8 @@ func ChannelType2APIType(channelType int) (int, bool) {
 		apiType = APITypeVolcEngine
 	case common.ChannelTypeBaiduV2:
 		apiType = APITypeBaiduV2
+	case common.ChannelTypeOpenRouter:
+		apiType = APITypeOpenRouter
 	}
 	if apiType == -1 {
 		return APITypeOpenAI, false
diff --git a/relay/relay_adaptor.go b/relay/relay_adaptor.go
index c9111106..00cff316 100644
--- a/relay/relay_adaptor.go
+++ b/relay/relay_adaptor.go
@@ -18,6 +18,7 @@ import (
 	"one-api/relay/channel/mokaai"
 	"one-api/relay/channel/ollama"
 	"one-api/relay/channel/openai"
+	"one-api/relay/channel/openrouter"
 	"one-api/relay/channel/palm"
 	"one-api/relay/channel/perplexity"
 	"one-api/relay/channel/siliconflow"
@@ -83,6 +84,8 @@ func GetAdaptor(apiType int) channel.Adaptor {
 		return &volcengine.Adaptor{}
 	case constant.APITypeBaiduV2:
 		return &baidu_v2.Adaptor{}
+	case constant.APITypeOpenRouter:
+		return &openrouter.Adaptor{}
 	}
 	return nil
 }