diff --git a/changelog.d/fixes/12468-openrouter-payg-credit-pool.md b/changelog.d/fixes/12468-openrouter-payg-credit-pool.md
new file mode 100644
index 0000000000..5cfe4615ff
--- /dev/null
+++ b/changelog.d/fixes/12468-openrouter-payg-credit-pool.md
@@ -0,0 +1 @@
+- **fix(usage):** Render OpenRouter PAYG account credits as a metered quota when no per-key spending limit is set ([#12468](https://github.com/diegosouzapw/OmniRoute/pull/12468))
diff --git a/open-sse/services/usage/openrouter.ts b/open-sse/services/usage/openrouter.ts
index 4fce98ec18..d423ba60b9 100644
--- a/open-sse/services/usage/openrouter.ts
+++ b/open-sse/services/usage/openrouter.ts
@@ -15,18 +15,58 @@ import {
 import { type UsageQuota } from "./quota.ts";
 
 function buildCreditsQuota(quota: OpenrouterQuota): UsageQuota | null {
+  // OpenRouter #12256 + #12468: per-key USD cap and account-level credit pool
+  // both flow through this builder. Per-key limit wins; PAYG accounts without
+  // a key cap report `limit: null` plus a credit pool derived from
+  // `totalCredits - totalUsage`. We use `totalCredits` as the bar denominator
+  // when no key limit exists and the pool is positive; a non-positive pool
+  // must never fabricate a 100% bar.
   if (quota.limit === null && quota.creditBalance === null) return null;
+  const hasKeyLimit = quota.limit !== null;
+  const hasPositivePool =
+    quota.creditBalance !== null &&
+    quota.creditBalance !== undefined &&
+    Number.isFinite(quota.creditBalance) &&
+    quota.creditBalance > 0;
+  const totalCredits =
+    quota.totalCredits !== null &&
+    quota.totalCredits !== undefined &&
+    Number.isFinite(quota.totalCredits) &&
+    quota.totalCredits > 0
+      ? quota.totalCredits
+      : 0;
+  const total = hasKeyLimit
+    ? (quota.limit ?? 0)
+    : totalCredits > 0
+      ? totalCredits
+      : hasPositivePool
+        ? quota.creditBalance!
+        : 0;
+  const used = hasKeyLimit
+    ? quota.limit! - (quota.limitRemaining ?? quota.limit!)
+    : total > 0 && hasPositivePool
+      ? Math.max(0, total - (quota.creditBalance ?? 0))
+      : 0;
+  const remaining = hasKeyLimit
+    ? (quota.limitRemaining ?? 0)
+    : hasPositivePool
+      ? (quota.creditBalance ?? 0)
+      : 0;
+  const remainingPercentage = hasKeyLimit
+    ? Math.max(0, Math.min(100, Math.round((1 - quota.percentUsed) * 100)))
+    : total > 0 && totalCredits > 0 && hasPositivePool
+      ? Math.max(0, Math.min(100, Math.round(((quota.creditBalance ?? 0) / totalCredits) * 100)))
+      : undefined;
   return {
-    used: quota.limit !== null ? quota.limit - (quota.limitRemaining ?? quota.limit) : 0,
-    total: quota.limit ?? 0,
-    remaining: quota.creditBalance ?? undefined,
-    remainingPercentage: quota.limit !== null ? Math.round((1 - quota.percentUsed) * 100) : 100,
+    used,
+    total,
+    remaining,
+    remainingPercentage,
     resetAt: quota.resetAt ?? null,
-    unlimited: quota.limit === null,
+    unlimited: !hasKeyLimit && !hasPositivePool,
     currency: "USD",
   };
 }
-
 function buildFreeWindowQuota(connectionId: string, connection?: Record<string, unknown>) {
   const accountKey = resolveAccountKey(connectionId, connection);
   const status = getFreeWindowStatus(accountKey);
diff --git a/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/quotaParsing.ts b/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/quotaParsing.ts
index 0808afea17..463c19d0c6 100644
--- a/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/quotaParsing.ts
+++ b/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/quotaParsing.ts
@@ -331,13 +331,26 @@ function parseAgentrouter(data: any) {
 // USD. Free-tier request windows keep the generic percentage treatment.
 function parseOpenrouterQuota(quotaKey: string, quota: any) {
   if (quotaKey !== "credits") return normalizeQuotaEntry(quotaKey, quota);
+  // OpenRouter backend (PRs #12256 + #12468) reports a positive-denominator
+  // PAYG payload (used, total, remaining, remainingPercentage) and a
+  // balance-only payload under legacy keys. The credits renderer in
+  // QuotaCardExpanded short-circuits when `isCredits: true` and only shows
+  // the remaining balance as USD - so a positive-denominator PAYG row
+  // must NOT take that branch. Positive denominators go through the regular
+  // normalizeQuotaEntry() path (which keeps currency as an extra); only a
+  // missing/non-positive denominator falls back to buildCreditsQuota() so
+  // the balance row stays renderable without inventing a 100% percentage.
+  const total = Number(quota?.total ?? 0);
+  if (Number.isFinite(total) && total > 0) {
+    return normalizeQuotaEntry(quotaKey, quota, {
+      currency: quota?.currency ?? "USD",
+    });
+  }
   const remaining = Math.max(0, Number(quota?.remaining ?? 0));
-  const currency = quota?.currency || "USD";
-  const remainingPercentage =
-    safePercentage(quota?.remainingPercentage) ?? (remaining > 0 ? 100 : 0);
+  const currency = quota?.currency ?? "USD";
+  const remainingPercentage = safePercentage(quota?.remainingPercentage) ?? 0;
   return buildCreditsQuota("credits", remaining, remainingPercentage, { currency });
 }
-
 function parseOpenrouter(data: any) {
   return quotaEntries(data).map(([quotaKey, quota]) => parseOpenrouterQuota(quotaKey, quota));
 }
diff --git a/tests/unit/openrouter-payg-credit-percentage.test.ts b/tests/unit/openrouter-payg-credit-percentage.test.ts
new file mode 100644
index 0000000000..664d090729
--- /dev/null
+++ b/tests/unit/openrouter-payg-credit-percentage.test.ts
@@ -0,0 +1,114 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+
+import { invalidateOpenrouterQuotaCache } from "../../open-sse/services/openrouterQuotaFetcher.ts";
+import { getOpenrouterUsage } from "../../open-sse/services/usage/openrouter.ts";
+
+const originalFetch = globalThis.fetch;
+
+test.afterEach(() => {
+  globalThis.fetch = originalFetch;
+});
+
+type CreditsQuota = {
+  used: number;
+  total: number;
+  remaining?: number;
+  remainingPercentage?: number;
+  unlimited: boolean;
+};
+
+async function creditsQuota(
+  connectionId: string,
+  key: { limit: number | null; limitRemaining: number | null },
+  credits: { totalCredits: number | null; totalUsage: number | null }
+): Promise<CreditsQuota> {
+  globalThis.fetch = (async (url: unknown) => {
+    if (String(url).endsWith("/key")) {
+      return new Response(
+        JSON.stringify({
+          data: {
+            limit: key.limit,
+            limit_remaining: key.limitRemaining,
+            limit_reset: null,
+            is_free_tier: false,
+          },
+        }),
+        { status: 200 }
+      );
+    }
+    return new Response(
+      JSON.stringify({
+        data: {
+          total_credits: credits.totalCredits,
+          total_usage: credits.totalUsage,
+        },
+      }),
+      { status: 200 }
+    );
+  }) as typeof fetch;
+
+  const result = await getOpenrouterUsage(connectionId, "synthetic-openrouter-key");
+  invalidateOpenrouterQuotaCache(connectionId);
+  const quota = result.quotas?.credits as CreditsQuota | undefined;
+  assert.ok(quota);
+  return quota;
+}
+
+test("OpenRouter explicit key limit reports remaining percentage", async () => {
+  const quota = await creditsQuota(
+    "openrouter-payg-key-limit",
+    { limit: 10, limitRemaining: 9.3 },
+    { totalCredits: 10, totalUsage: 0.7 }
+  );
+
+  assert.equal(quota.total, 10);
+  assert.ok(Math.abs(quota.used - 0.7) < 0.000_001);
+  assert.equal(quota.remaining, 9.3);
+  assert.equal(quota.remainingPercentage, 93);
+  assert.equal(quota.unlimited, false);
+});
+
+test("OpenRouter PAYG account credits provide denominator without key limit", async () => {
+  const quota = await creditsQuota(
+    "openrouter-payg-account",
+    { limit: null, limitRemaining: null },
+    { totalCredits: 10, totalUsage: 0.7 }
+  );
+
+  assert.equal(quota.total, 10);
+  assert.ok(Math.abs(quota.used - 0.7) < 0.000_001);
+  assert.ok(Math.abs((quota.remaining ?? 0) - 9.3) < 0.000_001);
+  assert.equal(quota.remainingPercentage, 93);
+  assert.equal(quota.unlimited, false);
+});
+
+test("OpenRouter key limit takes priority over account credits", async () => {
+  const quota = await creditsQuota(
+    "openrouter-payg-key-priority",
+    { limit: 5, limitRemaining: 2 },
+    { totalCredits: 10, totalUsage: 0.7 }
+  );
+
+  assert.equal(quota.total, 5);
+  assert.equal(quota.used, 3);
+  assert.equal(quota.remaining, 2);
+  assert.equal(quota.remainingPercentage, 40);
+  assert.equal(quota.unlimited, false);
+});
+
+test("OpenRouter balance without positive denominator does not invent 100 percent", async () => {
+  const quota = await creditsQuota(
+    "openrouter-payg-no-denominator",
+    { limit: null, limitRemaining: null },
+    { totalCredits: 0, totalUsage: -5 }
+  );
+
+  // No positive pool denominator: balance is still surfaced as a credit
+  // row but no fabricated 100% percentage is reported.
+  assert.equal(quota.total, 5);
+  assert.equal(quota.used, 0);
+  assert.equal(quota.remaining, 5);
+  assert.equal(quota.remainingPercentage, undefined);
+  assert.equal(quota.unlimited, false);
+});
diff --git a/tests/unit/providerlimits-openrouter-credits-parser.test.ts b/tests/unit/providerlimits-openrouter-credits-parser.test.ts
new file mode 100644
index 0000000000..e84357642e
--- /dev/null
+++ b/tests/unit/providerlimits-openrouter-credits-parser.test.ts
@@ -0,0 +1,130 @@
+/**
+ * Frontend parser regression #12468 follow-up.
+ */
+import test from "node:test";
+import assert from "node:assert/strict";
+
+import { parseQuotaData } from "../../src/app/(dashboard)/dashboard/usage/components/ProviderLimits/quotaParsing.ts";
+
+const parseOpenrouter = (data: unknown) => parseQuotaData("openrouter", data) as QuotaRow[];
+
+type QuotaRow = {
+  name: string;
+  used: number;
+  total: number;
+  remaining: number;
+  remainingPercentage?: number;
+  unlimited?: boolean;
+  isCredits?: boolean;
+  creditCount?: number;
+  currency?: string;
+};
+
+function findCredits(rows: QuotaRow[]): QuotaRow {
+  const row = rows.find((r: QuotaRow) => r.name === "credits");
+  assert.ok(row, "expected 'credits' row");
+  return row as QuotaRow;
+}
+
+test("parseOpenrouter renders PAYG account quota with normal percentage bar (no isCredits short-circuit)", () => {
+  const rows = parseOpenrouter({
+    quotas: {
+      credits: {
+        used: 7.332_573_982,
+        total: 10,
+        remaining: 2.667_426_018,
+        remainingPercentage: 27,
+        unlimited: false,
+        currency: "USD",
+      },
+    },
+  });
+  const row = findCredits(rows);
+  assert.equal(row.total, 10, "total must come from PAYG denominator");
+  assert.ok(Math.abs(row.used - 7.332_573_982) < 1e-6);
+  assert.ok(Math.abs(row.remaining - 2.667_426_018) < 1e-6);
+  assert.equal(row.remainingPercentage, 27);
+  assert.equal(row.currency, "USD");
+  // The credits renderer in QuotaCardExpanded short-circuits when isCredits
+  // is true and only shows the USD balance - a positive-denominator PAYG row
+  // must NOT take that branch.
+  assert.notEqual(row.isCredits, true, "PAYG row must not flip isCredits");
+});
+
+test("parseOpenrouter keeps credit-balance row when no positive denominator", () => {
+  const rows = parseOpenrouter({
+    quotas: {
+      credits: {
+        used: 0,
+        total: 0,
+        remaining: 2.67,
+        unlimited: false,
+        currency: "USD",
+      },
+    },
+  });
+  const row = findCredits(rows);
+  assert.equal(row.total, 0);
+  assert.equal(row.used, 0);
+  assert.equal(row.remaining, 2.67);
+  assert.equal(row.isCredits, true, "balance row keeps isCredits renderer");
+  assert.equal(row.creditCount, 2.67);
+  assert.notEqual(row.remainingPercentage, 100, "no fabricated 100% percentage");
+});
+
+test("parseOpenrouter falls back to balance row for non-finite denominator", () => {
+  const rows = parseOpenrouter({
+    quotas: {
+      credits: { used: 0, total: NaN, remaining: 1.5 },
+    },
+  });
+  const row = findCredits(rows);
+  assert.equal(row.isCredits, true);
+  assert.equal(row.remaining, 1.5);
+});
+
+test("parseOpenrouter keeps per-model rows alongside PAYG credit row", () => {
+  const rows = parseOpenrouter({
+    quotas: {
+      credits: {
+        used: 7.332_573_982,
+        total: 10,
+        remaining: 2.667_426_018,
+        remainingPercentage: 27,
+        unlimited: false,
+        currency: "USD",
+      },
+      "anthropic/claude-3.5-sonnet": {
+        used: 12,
+        total: 100,
+        remaining: 88,
+        resetAt: null,
+      },
+    },
+  });
+  assert.equal(rows.length, 2);
+  const credits = findCredits(rows);
+  assert.equal(credits.total, 10);
+  assert.ok(Math.abs(credits.used - 7.332_573_982) < 1e-6);
+  assert.equal(credits.remainingPercentage, 27);
+  assert.notEqual(credits.isCredits, true);
+});
+
+test("parseOpenrouter passes non-credits quota keys through normalizeQuotaEntry", () => {
+  const rows = parseOpenrouter({
+    quotas: {
+      "anthropic/claude-3.5-sonnet": {
+        used: 12,
+        total: 100,
+        remaining: 88,
+        resetAt: null,
+      },
+    },
+  });
+  assert.equal(rows.length, 1);
+  const row = rows[0];
+  assert.equal(row.name, "anthropic/claude-3.5-sonnet");
+  assert.equal(row.total, 100);
+  assert.equal(row.remaining, 88);
+  assert.notEqual(row.isCredits, true);
+});