diff --git a/lib/credits/__tests__/const.test.ts b/lib/credits/__tests__/const.test.ts
new file mode 100644
index 00000000..10438429
--- /dev/null
+++ b/lib/credits/__tests__/const.test.ts
@@ -0,0 +1,13 @@
+import { describe, expect, it } from "vitest";
+
+import { DEFAULT_CREDITS, PRO_CREDITS } from "@/lib/credits/const";
+
+describe("credit plan constants", () => {
+  it("keeps the free-tier allotment at 333 (matches chat/lib/consts.ts)", () => {
+    expect(DEFAULT_CREDITS).toBe(333);
+  });
+
+  it("gives pro accounts 9999 credits per month (matches chat/lib/consts.ts)", () => {
+    expect(PRO_CREDITS).toBe(9999);
+  });
+});
diff --git a/lib/credits/__tests__/getAccountSubscriptionState.test.ts b/lib/credits/__tests__/getAccountSubscriptionState.test.ts
index 5c9e0d45..989b1c3b 100644
--- a/lib/credits/__tests__/getAccountSubscriptionState.test.ts
+++ b/lib/credits/__tests__/getAccountSubscriptionState.test.ts
@@ -3,6 +3,7 @@ import { beforeEach, describe, expect, it, vi } from "vitest";
 import { getAccountSubscriptionState } from "@/lib/credits/getAccountSubscriptionState";
 import { getActiveSubscriptionDetails } from "@/lib/stripe/getActiveSubscriptionDetails";
 import { getOrgSubscription } from "@/lib/stripe/getOrgSubscription";
+import { isEnterpriseAccount } from "@/lib/enterprise/isEnterpriseAccount";
 
 vi.mock("@/lib/stripe/getActiveSubscriptionDetails", () => ({
   getActiveSubscriptionDetails: vi.fn(),
@@ -12,11 +13,16 @@ vi.mock("@/lib/stripe/getOrgSubscription", () => ({
   getOrgSubscription: vi.fn(),
 }));
 
+vi.mock("@/lib/enterprise/isEnterpriseAccount", () => ({
+  isEnterpriseAccount: vi.fn(),
+}));
+
 const ACCOUNT = "123e4567-e89b-12d3-a456-426614174000";
 
 describe("getAccountSubscriptionState", () => {
   beforeEach(() => {
     vi.clearAllMocks();
+    vi.mocked(isEnterpriseAccount).mockResolvedValue(false);
   });
 
   it("returns isPro=false / activeSubscription=null when neither subscription is active", async () => {
@@ -69,4 +75,30 @@ describe("getAccountSubscriptionState", () => {
 
     expect(result).toEqual({ isPro: false, activeSubscription: null });
   });
+
+  it("returns isPro=true with activeSubscription=null for an enterprise account without Stripe", async () => {
+    vi.mocked(getActiveSubscriptionDetails).mockResolvedValue(null);
+    vi.mocked(getOrgSubscription).mockResolvedValue(null);
+    vi.mocked(isEnterpriseAccount).mockResolvedValue(true);
+
+    const result = await getAccountSubscriptionState(ACCOUNT);
+
+    expect(result).toEqual({ isPro: true, activeSubscription: null });
+    expect(isEnterpriseAccount).toHaveBeenCalledWith(ACCOUNT);
+  });
+
+  it("keeps activeSubscription Stripe-only when both enterprise and a Stripe sub apply", async () => {
+    const accountSub = {
+      id: "sub_account",
+      status: "active",
+      canceled_at: null,
+    } as never;
+    vi.mocked(getActiveSubscriptionDetails).mockResolvedValue(accountSub);
+    vi.mocked(getOrgSubscription).mockResolvedValue(null);
+    vi.mocked(isEnterpriseAccount).mockResolvedValue(true);
+
+    const result = await getAccountSubscriptionState(ACCOUNT);
+
+    expect(result).toEqual({ isPro: true, activeSubscription: accountSub });
+  });
 });
diff --git a/lib/credits/const.ts b/lib/credits/const.ts
index 67b75527..13db892f 100644
--- a/lib/credits/const.ts
+++ b/lib/credits/const.ts
@@ -5,9 +5,11 @@
 export const DEFAULT_CREDITS = 333;
 
 /**
- * Monthly credit allotment for accounts on a pro plan (directly or via an organization).
+ * Monthly credit allotment for accounts on a pro plan (directly, via an
+ * organization, or via an enterprise email domain). Effectively "don't think
+ * about credits" for paying customers.
  */
-export const PRO_CREDITS = 1000;
+export const PRO_CREDITS = 9999;
 
 /**
  * Credits added per automatic top-up when a request would push an account below
diff --git a/lib/credits/getAccountSubscriptionState.ts b/lib/credits/getAccountSubscriptionState.ts
index 9227d86f..fb9d4fa4 100644
--- a/lib/credits/getAccountSubscriptionState.ts
+++ b/lib/credits/getAccountSubscriptionState.ts
@@ -2,6 +2,7 @@ import type Stripe from "stripe";
 import isActiveSubscription from "@/lib/stripe/isActiveSubscription";
 import { getActiveSubscriptionDetails } from "@/lib/stripe/getActiveSubscriptionDetails";
 import { getOrgSubscription } from "@/lib/stripe/getOrgSubscription";
+import { isEnterpriseAccount } from "@/lib/enterprise/isEnterpriseAccount";
 
 export interface AccountSubscriptionState {
   isPro: boolean;
@@ -9,25 +10,28 @@ export interface AccountSubscriptionState {
 }
 
 /**
- * Single source of truth for "what's this account's plan?" — checks both the
- * account-level subscription and any org membership in parallel, then resolves
- * the active subscription with account-wins-on-tie precedence.
+ * Single source of truth for "what's this account's plan?" — checks the
+ * account-level subscription, any org membership, and enterprise email-domain
+ * status in parallel. `isPro` is true if any of the three match; the active
+ * subscription resolves with account-wins-on-tie precedence.
  *
- * Returns the resolved Stripe.Subscription alongside the boolean so callers
- * that need period-start timestamps (e.g. checkAndResetCredits) don't have to
- * re-derive which one was active.
+ * `activeSubscription` stays Stripe-only on purpose: it feeds
+ * checkAndResetCredits's early-refill via `current_period_start`, and
+ * enterprise-domain accounts (no Stripe sub) must refill on the ≥1-month path
+ * only — so an enterprise match yields `isPro: true, activeSubscription: null`.
  */
 export async function getAccountSubscriptionState(
   accountId: string,
 ): Promise<AccountSubscriptionState> {
-  const [accountSub, orgSub] = await Promise.all([
+  const [accountSub, orgSub, isEnterprise] = await Promise.all([
     getActiveSubscriptionDetails(accountId),
     getOrgSubscription(accountId),
+    isEnterpriseAccount(accountId),
   ]);
   const hasAccountSub = isActiveSubscription(accountSub);
   const hasOrgSub = isActiveSubscription(orgSub);
   return {
-    isPro: hasAccountSub || hasOrgSub,
+    isPro: hasAccountSub || hasOrgSub || isEnterprise,
     activeSubscription: hasAccountSub ? accountSub : hasOrgSub ? orgSub : null,
   };
 }
diff --git a/lib/enterprise/__tests__/isEnterpriseAccount.test.ts b/lib/enterprise/__tests__/isEnterpriseAccount.test.ts
new file mode 100644
index 00000000..6ff52a74
--- /dev/null
+++ b/lib/enterprise/__tests__/isEnterpriseAccount.test.ts
@@ -0,0 +1,60 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+import { isEnterpriseAccount } from "@/lib/enterprise/isEnterpriseAccount";
+import selectAccountEmails from "@/lib/supabase/account_emails/selectAccountEmails";
+
+vi.mock("@/lib/supabase/account_emails/selectAccountEmails", () => ({
+  default: vi.fn(),
+}));
+
+const ACCOUNT = "123e4567-e89b-12d3-a456-426614174000";
+
+function emailRow(email: string | null) {
+  return { account_id: ACCOUNT, email, id: "row-1" } as never;
+}
+
+describe("isEnterpriseAccount", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("returns true when an account email's domain is in ENTERPRISE_DOMAINS", async () => {
+    vi.mocked(selectAccountEmails).mockResolvedValue([emailRow("artist@seekermusic.com")]);
+
+    await expect(isEnterpriseAccount(ACCOUNT)).resolves.toBe(true);
+    expect(selectAccountEmails).toHaveBeenCalledWith({ accountIds: ACCOUNT });
+  });
+
+  it("matches domains case-insensitively", async () => {
+    vi.mocked(selectAccountEmails).mockResolvedValue([emailRow("Artist@SeekerMusic.com")]);
+
+    await expect(isEnterpriseAccount(ACCOUNT)).resolves.toBe(true);
+  });
+
+  it("returns true when any of multiple emails matches", async () => {
+    vi.mocked(selectAccountEmails).mockResolvedValue([
+      emailRow("personal@gmail.com"),
+      emailRow("work@rostrumrecords.com"),
+    ]);
+
+    await expect(isEnterpriseAccount(ACCOUNT)).resolves.toBe(true);
+  });
+
+  it("returns false when no email domain is enterprise", async () => {
+    vi.mocked(selectAccountEmails).mockResolvedValue([emailRow("someone@gmail.com")]);
+
+    await expect(isEnterpriseAccount(ACCOUNT)).resolves.toBe(false);
+  });
+
+  it("returns false when the account has no emails", async () => {
+    vi.mocked(selectAccountEmails).mockResolvedValue([]);
+
+    await expect(isEnterpriseAccount(ACCOUNT)).resolves.toBe(false);
+  });
+
+  it("returns false for rows with null or malformed emails", async () => {
+    vi.mocked(selectAccountEmails).mockResolvedValue([emailRow(null), emailRow("not-an-email")]);
+
+    await expect(isEnterpriseAccount(ACCOUNT)).resolves.toBe(false);
+  });
+});
diff --git a/lib/enterprise/isEnterpriseAccount.ts b/lib/enterprise/isEnterpriseAccount.ts
new file mode 100644
index 00000000..e5866657
--- /dev/null
+++ b/lib/enterprise/isEnterpriseAccount.ts
@@ -0,0 +1,16 @@
+import { ENTERPRISE_DOMAINS } from "@/lib/enterprise/consts";
+import { extractDomain } from "@/lib/email/extractDomain";
+import selectAccountEmails from "@/lib/supabase/account_emails/selectAccountEmails";
+
+/**
+ * Resolves whether an account belongs to an enterprise customer: true when any
+ * of the account's emails has a domain in ENTERPRISE_DOMAINS. Used by the
+ * credits system to grant pro status without a Stripe subscription.
+ */
+export async function isEnterpriseAccount(accountId: string): Promise<boolean> {
+  const rows = await selectAccountEmails({ accountIds: accountId });
+  return rows.some(row => {
+    const domain = row.email ? extractDomain(row.email) : null;
+    return domain !== null && ENTERPRISE_DOMAINS.has(domain);
+  });
+}