diff --git a/open-sse/services/quotaFetchThrottle.ts b/open-sse/services/quotaFetchThrottle.ts
index d8791fc8d71d..8a2c4050b58f 100644
--- a/open-sse/services/quotaFetchThrottle.ts
+++ b/open-sse/services/quotaFetchThrottle.ts
@@ -65,17 +65,21 @@ export class MinIntervalThrottle {
     });
     try {
       await prev;
+      // The chain is single-file here, so this read cannot race another acquire.
       const now = this.clock.now();
-      if (this.lastStart !== 0) {
-        const jitter = this.jitterMs > 0 ? Math.floor(this.rand() * this.jitterMs) : 0;
-        const wait = this.lastStart + this.minIntervalMs + jitter - now;
-        if (wait > 0) await this.clock.sleep(wait);
-      }
-      this.lastStart = this.clock.now();
+      const startAt =
+        this.lastStart === 0 ? now : this.lastStart + this.minIntervalMs + this.nextJitter();
+      this.lastStart = startAt;
+      const wait = startAt - now;
+      if (wait > 0) await this.clock.sleep(wait);
     } finally {
       release();
     }
   }
+
+  private nextJitter(): number {
+    return this.jitterMs > 0 ? Math.floor(this.rand() * this.jitterMs) : 0;
+  }
 }
 
 /**
@@ -116,3 +120,8 @@ export function throttleQuotaFetch(): Promise<void> {
 export function resetQuotaFetchThrottle(): void {
   _sharedThrottle = null;
 }
+
+/** Test-only: install a throttle as the process-wide gate. */
+export function setQuotaFetchThrottleForTests(throttle: MinIntervalThrottle | null): void {
+  _sharedThrottle = throttle;
+}
diff --git a/open-sse/services/usage.ts b/open-sse/services/usage.ts
index 8bacffc6cb2a..077533ae0c0c 100644
--- a/open-sse/services/usage.ts
+++ b/open-sse/services/usage.ts
@@ -43,6 +43,7 @@ import {
 import { getCursorUsage } from "./usage/cursor.ts";
 import { getKimiUsage } from "./usage/kimi.ts";
 import { getCodexUsage } from "./usage/codex.ts";
+import { throttleQuotaFetch } from "./quotaFetchThrottle.ts";
 import { getClaudeUsage, getClaudePlanLabel } from "./usage/claude.ts";
 import { getKiroUsage, buildKiroUsageResult, discoverKiroProfileArn } from "./usage/kiro.ts";
 // Re-exported para os testes kiro-* (importam de services/usage).
@@ -154,6 +155,11 @@ export async function getUsageForProvider(
     case "claude":
       return await getClaudeUsage(accessToken);
     case "codex":
+      // /me/status and the quota-cache refresh reach this fetch with no
+      // caller-side pacing. Gate the start here so those paths, and any later
+      // one, cannot burst the usage endpoint. Callers that already acquired the
+      // shared gate wait at most one more interval.
+      await throttleQuotaFetch();
       return await getCodexUsage(accessToken, providerSpecificData);
     case "cursor":
       return await getCursorUsage(accessToken || "", providerSpecificData);
diff --git a/open-sse/services/usage/codex.ts b/open-sse/services/usage/codex.ts
index 64b37c01838e..3d8b44b85fc2 100644
--- a/open-sse/services/usage/codex.ts
+++ b/open-sse/services/usage/codex.ts
@@ -17,6 +17,14 @@ const CODEX_CONFIG = {
   usageUrl: "https://chatgpt.com/backend-api/wham/usage",
 };
 
+type CodexUsageFetch = (input: string, init: RequestInit) => Promise<Response>;
+let codexUsageFetch: CodexUsageFetch = (input, init) => fetch(input, init);
+
+/** Test-only: replace the usage request. Pass null to restore global fetch. */
+export function setCodexUsageFetchForTests(fetchImpl: CodexUsageFetch | null): void {
+  codexUsageFetch = fetchImpl ?? ((input, init) => fetch(input, init));
+}
+
 /**
  * Codex (OpenAI) Usage - Fetch from ChatGPT backend API
  * IMPORTANT: Uses persisted workspaceId from OAuth to ensure correct workspace binding.
@@ -46,7 +54,7 @@ export async function getCodexUsage(
       headers["chatgpt-account-id"] = accountId;
     }
 
-    const response = await fetch(CODEX_CONFIG.usageUrl, {
+    const response = await codexUsageFetch(CODEX_CONFIG.usageUrl, {
       method: "GET",
       headers,
     });
diff --git a/tests/unit/codex-usage-status-throttle-15172.test.ts b/tests/unit/codex-usage-status-throttle-15172.test.ts
new file mode 100644
index 000000000000..623212241480
--- /dev/null
+++ b/tests/unit/codex-usage-status-throttle-15172.test.ts
@@ -0,0 +1,135 @@
+/**
+ * #15172 — Codex usage reads that reach /wham/usage through getUsageForProvider
+ * (the /me/status fan-out and the quota-cache background refresh both do) must
+ * take the same min-interval gate as the dedicated quota fetchers. Auto-Ping
+ * already acquires that gate itself, so the extra wait on its path is at most
+ * one interval.
+ */
+import test from "node:test";
+import assert from "node:assert/strict";
+
+import { getUsageForProvider } from "../../open-sse/services/usage.ts";
+import { setCodexUsageFetchForTests } from "../../open-sse/services/usage/codex.ts";
+import {
+  MinIntervalThrottle,
+  resetQuotaFetchThrottle,
+  setQuotaFetchThrottleForTests,
+  type ThrottleClock,
+} from "../../open-sse/services/quotaFetchThrottle.ts";
+import {
+  createQuotaAutoPingState,
+  runQuotaAutoPingTick,
+} from "../../src/lib/services/quotaAutoPing.ts";
+
+const INTERVAL_MS = 250;
+
+class FakeClock implements ThrottleClock {
+  t = 1_000;
+  now = () => this.t;
+  sleep = async (ms: number) => {
+    this.t += ms;
+  };
+}
+
+function installSharedThrottle(clock: FakeClock | null) {
+  const shared = new MinIntervalThrottle({
+    minIntervalMs: INTERVAL_MS,
+    jitterMs: 0,
+    ...(clock ? { clock } : {}),
+  });
+  setQuotaFetchThrottleForTests(shared);
+  return () => resetQuotaFetchThrottle();
+}
+
+function installUsageFetch(clock: FakeClock | null) {
+  const starts: number[] = [];
+  setCodexUsageFetchForTests(async () => {
+    starts.push(clock ? clock.now() : Date.now());
+    return new Response(
+      JSON.stringify({
+        plan_type: "plus",
+        rate_limit: {
+          primary_window: { used_percent: 10 },
+          secondary_window: { used_percent: 20 },
+        },
+      }),
+      { status: 200, headers: { "content-type": "application/json" } }
+    );
+  });
+  return {
+    starts,
+    restore: () => setCodexUsageFetchForTests(null),
+  };
+}
+
+test("#15172 concurrent Codex usage fetches start at least one interval apart", async () => {
+  const restoreThrottle = installSharedThrottle(null);
+  const { starts, restore } = installUsageFetch(null);
+
+  try {
+    const connections = ["a", "b", "c", "d"].map((id) => ({
+      id,
+      provider: "codex",
+      accessToken: `token-${id}`,
+      providerSpecificData: { workspaceId: `ws-${id}` },
+    }));
+    await Promise.all(connections.map((connection) => getUsageForProvider(connection)));
+
+    assert.equal(starts.length, 4);
+    for (let i = 1; i < starts.length; i++) {
+      const gap = starts[i] - starts[i - 1];
+      assert.ok(
+        gap >= INTERVAL_MS - 30,
+        `gap ${gap}ms between fetch ${i - 1} and ${i} is below one interval`
+      );
+    }
+  } finally {
+    restore();
+    restoreThrottle();
+  }
+});
+
+test("#15172 Auto-Ping's own gate adds at most one extra interval", async () => {
+  const clock = new FakeClock();
+  const restoreThrottle = installSharedThrottle(clock);
+  const { starts, restore } = installUsageFetch(clock);
+
+  const deps = {
+    getSettings: async () => ({
+      codexAutoPing: { connections: { "codex-1": true, "codex-2": true } },
+    }),
+    getProviderConnections: async () => [
+      { id: "codex-1", provider: "codex", authType: "oauth", accessToken: "token-1" },
+      { id: "codex-2", provider: "codex", authType: "oauth", accessToken: "token-2" },
+    ],
+    updateProviderConnection: async () => null,
+    refreshAndUpdateCredentials: async (connection: unknown) => ({ connection }),
+    getCodexUsage: (accessToken?: string, providerSpecificData?: Record<string, unknown>) =>
+      getUsageForProvider({
+        provider: "codex",
+        accessToken,
+        providerSpecificData,
+      }),
+    throttleQuotaFetch: () =>
+      new MinIntervalThrottle({ minIntervalMs: INTERVAL_MS, jitterMs: 0, clock }).acquire(),
+    resolveProxyForConnection: async () => ({ proxy: null }),
+    runWithProxyContext: async (_proxy: unknown, callback: () => Promise<unknown>) => callback(),
+    getExecutor: () => ({
+      execute: async () => ({ response: { ok: true, text: async () => "" } }),
+    }),
+    canExecuteProvider: () => true,
+    isConnectionUnavailableToAuxiliaryActivity: async () => false,
+    resolvePingModel: async () => "gpt-5-codex",
+  };
+
+  try {
+    await runQuotaAutoPingTick(deps as never, createQuotaAutoPingState(), () => clock.now());
+    assert.equal(starts.length, 2);
+    const spread = starts[1] - starts[0];
+    assert.ok(spread >= INTERVAL_MS, `spread ${spread}ms is below one interval`);
+    assert.ok(spread <= INTERVAL_MS * 2, `spread ${spread}ms is more than one extra interval`);
+  } finally {
+    restore();
+    restoreThrottle();
+  }
+});