diff --git a/src/shared/key-management/xai/checker.ts b/src/shared/key-management/xai/checker.ts
index 03649a3..29c0857 100644
--- a/src/shared/key-management/xai/checker.ts
+++ b/src/shared/key-management/xai/checker.ts
@@ -39,42 +39,59 @@ export class XaiKeyChecker {
     }, CHECK_TIMEOUT);
 
     try {
-      const response = await fetch("https://api.x.ai/v1/chat/completions", {
+      // First check API key endpoint to verify key validity
+      const apiResponse = await fetch("https://api.x.ai/v1/api-key", {
+        method: "GET",
+        headers: {
+          Authorization: `Bearer ${key.key}`,
+        },
+        signal: controller.signal,
+      });
+
+      if (apiResponse.status !== 200) {
+        // Key is invalid or has some other issue
+        return "invalid";
+      }
+      
+      const apiData = await apiResponse.json();
+      const isBlocked = apiData.team_blocked || apiData.api_key_blocked || apiData.api_key_disabled;
+      
+      if (isBlocked) {
+        return "invalid";
+      }
+      
+      // If the key passed the first check, test a minimal API call to verify quota
+      const testResponse = await fetch("https://api.x.ai/v1/chat/completions", {
         method: "POST",
         headers: {
           "Content-Type": "application/json",
           Authorization: `Bearer ${key.key}`,
         },
         body: JSON.stringify({
-          model: "grok-3",
-          messages: [{ role: "user", content: "hi" }],
-          max_tokens: 0,
+          messages: [],
+          model: "grok-3-mini-latest",
+          frequency_penalty: -3.0,
         }),
         signal: controller.signal,
       });
 
-      switch (response.status) {
-        case 200:
-        case 400: {
-          // Check the response body for "Incorrect%20API"
-          const responseText = await response.text();
-          if (responseText.includes("Incorrect%20API")) {
-            return "invalid";
-          }
-          return "valid";
-        }
-        case 401:
-          return "invalid";
-        case 403:
-          return "invalid";
-        case 429:
-          return "quota";
-        default:
-          this.log.warn(
-            { status: response.status, hash: key.hash },
-            "Unexpected status code while checking key"
-          );
-          return "invalid";
+      // If we get 400 or 200, the key is valid (400 might be parameter error but key is valid)
+      if (testResponse.status === 400 || testResponse.status === 200) {
+        return "valid";
+      } else if (testResponse.status === 429) {
+        return "quota";
+      } else if (testResponse.status === 403) {
+        this.log.warn(
+          { status: testResponse.status, hash: key.hash },
+          "Forbidden (403) response, key is invalid"
+        );
+        return "invalid";
+      } else {
+        this.log.warn(
+          { status: testResponse.status, hash: key.hash },
+          "Unexpected status code while testing key usage"
+        );
+        return "invalid";
       }
     } catch (error) {
       if (error instanceof Error && error.name === 'AbortError') {