diff --git a/extensions/minimax/index.test.ts b/extensions/minimax/index.test.ts
index 6f2caef2685..e9213007188 100644
--- a/extensions/minimax/index.test.ts
+++ b/extensions/minimax/index.test.ts
@@ -4,6 +4,7 @@ import {
   registerProviderPlugin,
   requireRegisteredProvider,
 } from "openclaw/plugin-sdk/plugin-test-runtime";
+import { MINIMAX_OAUTH_MARKER } from "openclaw/plugin-sdk/provider-auth";
 import { describe, expect, it, vi } from "vitest";
 import { registerMinimaxProviders } from "./provider-registration.js";
 import { createMiniMaxWebSearchProvider } from "./src/minimax-web-search-provider.js";
@@ -325,6 +326,33 @@ describe("minimax provider hooks", () => {
     expect(result?.windows).toEqual([{ label: "5h", usedPercent: 2, resetAt: undefined }]);
   });
 
+  it("portal catalog resolves OAuth token via resolveProviderAuth with oauthMarker", async () => {
+    const { providers } = await registerProviderPlugin({
+      plugin: minimaxProviderPlugin,
+      id: "minimax",
+      name: "MiniMax Provider",
+    });
+    const portalProvider = requireRegisteredProvider(providers, "minimax-portal");
+    const resolveProviderAuth = vi.fn(() => ({
+      apiKey: MINIMAX_OAUTH_MARKER,
+      mode: "oauth" as const,
+      source: "profile" as const,
+    }));
+    const result = await portalProvider.catalog?.run({
+      config: {},
+      resolveProviderAuth,
+      resolveProviderApiKey: () => ({ apiKey: undefined }),
+    } as never);
+
+    expect(resolveProviderAuth).toHaveBeenCalledWith("minimax-portal", {
+      oauthMarker: MINIMAX_OAUTH_MARKER,
+    });
+    expect(result).not.toBeNull();
+    if (result && "provider" in result) {
+      expect(result.provider.apiKey).toBe(MINIMAX_OAUTH_MARKER);
+    }
+  });
+
   it("writes api and authHeader into the MiniMax portal OAuth config patch", async () => {
     const { providers } = await registerProviderPlugin({
       plugin: minimaxProviderPlugin,
diff --git a/extensions/minimax/provider-registration.ts b/extensions/minimax/provider-registration.ts
index b62ef3a1cf5..91a0d04c15d 100644
--- a/extensions/minimax/provider-registration.ts
+++ b/extensions/minimax/provider-registration.ts
@@ -6,11 +6,7 @@ import type {
   ProviderAuthResult,
   ProviderCatalogContext,
 } from "openclaw/plugin-sdk/plugin-entry";
-import {
-  MINIMAX_OAUTH_MARKER,
-  ensureAuthProfileStore,
-  listProfilesForProvider,
-} from "openclaw/plugin-sdk/provider-auth";
+import { MINIMAX_OAUTH_MARKER } from "openclaw/plugin-sdk/provider-auth";
 import { buildOauthProviderAuthResult } from "openclaw/plugin-sdk/provider-auth";
 import { createProviderApiKeyAuthMethod } from "openclaw/plugin-sdk/provider-auth-api-key";
 import { buildProviderReplayFamilyHooks } from "openclaw/plugin-sdk/provider-model-shared";
@@ -100,13 +96,13 @@ function resolveApiCatalog(ctx: ProviderCatalogContext) {
 
 function resolvePortalCatalog(ctx: ProviderCatalogContext) {
   const explicitProvider = ctx.config.models?.providers?.[PORTAL_PROVIDER_ID];
-  const envApiKey = ctx.resolveProviderApiKey(PORTAL_PROVIDER_ID).apiKey;
-  const authStore = ensureAuthProfileStore(ctx.agentDir, {
-    allowKeychainPrompt: false,
-  });
-  const hasProfiles = listProfilesForProvider(authStore, PORTAL_PROVIDER_ID).length > 0;
   const explicitApiKey = normalizeOptionalString(explicitProvider?.apiKey);
-  const apiKey = envApiKey ?? explicitApiKey ?? (hasProfiles ? MINIMAX_OAUTH_MARKER : undefined);
+  // resolveProviderAuth handles OAuth profiles via oauthMarker, returning the
+  // sentinel so the request layer can swap in the live access token (#79731).
+  const { apiKey: profileApiKey } = ctx.resolveProviderAuth(PORTAL_PROVIDER_ID, {
+    oauthMarker: MINIMAX_OAUTH_MARKER,
+  });
+  const apiKey = explicitApiKey ?? profileApiKey;
   if (!apiKey) {
     return null;
   }