diff --git a/src/frontend/src/lib/api/client.ts b/src/frontend/src/lib/api/client.ts
index 2f08455..f515a0d 100644
--- a/src/frontend/src/lib/api/client.ts
+++ b/src/frontend/src/lib/api/client.ts
@@ -140,7 +140,7 @@ export const api = {
 			const response = await fetch(`${API_URL}/bots/${botId}/backtest`, {
 				method: 'POST',
 				headers: getAuthHeaders(),
-				body: JSON.stringify(config)
+				body: JSON.stringify({ ...config, chain: 'bsc' })
 			});
 			return handleResponse<Backtest>(response);
 		},
diff --git a/src/frontend/src/lib/api/types.ts b/src/frontend/src/lib/api/types.ts
index f43db6b..1b5761f 100644
--- a/src/frontend/src/lib/api/types.ts
+++ b/src/frontend/src/lib/api/types.ts
@@ -69,6 +69,7 @@ export interface Backtest {
 
 export interface BacktestConfig {
 	token: string;
+	chain: string;
 	timeframe: string;
 	start_date: string;
 	end_date: string;