diff --git a/packages/api-contract/README.md b/packages/api-contract/README.md
new file mode 100644
index 0000000..de7f9d9
--- /dev/null
+++ b/packages/api-contract/README.md
@@ -0,0 +1,79 @@
+# @reviq/api-contract
+
+Contract-first API definitions using oRPC and Zod for the Publisher Dashboard authentication system.
+
+## Overview
+
+This package defines the complete API contract for all RPC procedures served at `/api/v1/rpc`. It uses:
+
+- **@orpc/contract** - Contract-first RPC framework
+- **Zod** - Runtime type validation and schema definitions
+- **libphonenumber-js** - Phone number validation and formatting
+
+## Structure
+
+```
+src/
+├── index.ts              # Main exports
+├── contract.ts           # oRPC contract with all procedure signatures
+└── schemas/
+    ├── common.ts         # Shared schemas (email, slug, phone)
+    ├── auth.ts           # Authentication schemas
+    ├── user.ts           # User profile and settings schemas
+    ├── org.ts            # Organization schemas
+    └── admin.ts          # Admin operation schemas
+```
+
+## Usage
+
+```typescript
+import { contract } from "@reviq/api-contract";
+import type { loginRequestInputSchema, loginRequestOutputSchema } from "@reviq/api-contract";
+
+// Use the contract to implement server handlers
+// Use the schemas for validation and type inference
+type LoginRequestInput = z.infer<typeof loginRequestInputSchema>;
+```
+
+## API Procedures
+
+### Auth (`auth.*`)
+- Signup, login, logout flows
+- Email verification
+- Password reset
+- WebAuthn (passkey) support
+
+### User (`me.*`)
+- Profile management
+- Password and passkey management
+- Session and device management
+
+### Organizations (`orgs.*`)
+- Org CRUD operations
+- Member management
+- Invitations
+- Site management
+
+### Admin (`admin.*`)
+- Superuser-only operations
+- User and org management
+- Site assignments
+
+## Development
+
+```bash
+# Build the package
+bun run build
+
+# Watch mode
+bun run dev
+
+# Type checking
+bun run typecheck
+```
+
+## Notes
+
+- All emails are automatically transformed to lowercase
+- Phone numbers are stored in E.164 format
+- Slugs follow domain name rules (2-63 chars, lowercase alphanumeric with hyphens)
diff --git a/packages/api-contract/eslint.config.js b/packages/api-contract/eslint.config.js
new file mode 100644
index 0000000..ee789e3
--- /dev/null
+++ b/packages/api-contract/eslint.config.js
@@ -0,0 +1,12 @@
+import { configs } from "@macalinao/eslint-config";
+
+export default [
+  ...configs.fast,
+  {
+    languageOptions: {
+      parserOptions: {
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+  },
+];
diff --git a/packages/api-contract/package.json b/packages/api-contract/package.json
new file mode 100644
index 0000000..6d32d8d
--- /dev/null
+++ b/packages/api-contract/package.json
@@ -0,0 +1,27 @@
+{
+  "name": "@reviq/api-contract",
+  "version": "0.0.1",
+  "type": "module",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsc",
+    "clean": "tsc --build --clean && rm -rf dist/ node_modules/ .eslintcache",
+    "lint": "eslint . --cache"
+  },
+  "dependencies": {
+    "@orpc/contract": "^1.13.2",
+    "libphonenumber-js": "^1.12.33",
+    "zod": "^4.3.5"
+  },
+  "devDependencies": {
+    "@macalinao/tsconfig": "catalog:",
+    "typescript": "catalog:"
+  }
+}
diff --git a/packages/api-contract/src/contract.ts b/packages/api-contract/src/contract.ts
new file mode 100644
index 0000000..27875df
--- /dev/null
+++ b/packages/api-contract/src/contract.ts
@@ -0,0 +1,228 @@
+import { oc } from "@orpc/contract";
+import { z } from "zod";
+import {
+  signupInputSchema,
+  verifyEmailInputSchema,
+  loginRequestInputSchema,
+  loginRequestOutputSchema,
+  loginPasswordInputSchema,
+  loginStatusOutputSchema,
+  forgotPasswordInputSchema,
+  resetPasswordInputSchema,
+} from "./schemas/auth.js";
+import {
+  userProfileSchema,
+  setupProfileInputSchema,
+  updateProfileInputSchema,
+  setPasswordInputSchema,
+  passkeyOutputSchema,
+  sessionOutputSchema,
+  deviceOutputSchema,
+  trustDeviceInputSchema,
+} from "./schemas/user.js";
+import {
+  createOrgInputSchema,
+  orgOutputSchema,
+  orgMemberOutputSchema,
+  updateMemberRoleInputSchema,
+  createInviteInputSchema,
+  orgInviteOutputSchema,
+  orgSiteOutputSchema,
+} from "./schemas/org.js";
+import {
+  adminCreateOrgInputSchema,
+  adminCreateUserInputSchema,
+  adminUpdateUserInputSchema,
+  adminAddSiteInputSchema,
+} from "./schemas/admin.js";
+import { emailSchema, slugSchema } from "./schemas/common.js";
+
+/**
+ * oRPC API Contract for the Publisher Dashboard
+ * This defines all RPC procedure signatures served at /api/v1/rpc
+ */
+export const contract = oc.router({
+  auth: oc.router({
+    // Signup and verification
+    signup: oc.input(signupInputSchema).output(z.void()),
+    verifyEmail: oc.input(verifyEmailInputSchema).output(z.void()),
+    resendVerificationEmail: oc.output(z.void()),
+
+    // Login flow
+    createLoginRequest: oc
+      .input(loginRequestInputSchema)
+      .output(loginRequestOutputSchema),
+    loginPassword: oc.input(loginPasswordInputSchema).output(z.void()),
+    loginPasswordConfirm: oc
+      .input(z.object({ token: z.string() }))
+      .output(z.void()),
+    loginIfRequestIsCompleted: oc.output(loginStatusOutputSchema),
+
+    // Password reset
+    forgotPassword: oc.input(forgotPasswordInputSchema).output(z.void()),
+    resetPassword: oc.input(resetPasswordInputSchema).output(z.void()),
+
+    // Logout
+    logout: oc.output(z.void()),
+
+    // WebAuthn procedures
+    webauthn: oc.router({
+      createRegistrationOptions: oc
+        .input(z.object({ email: emailSchema }))
+        .output(
+          z.object({
+            challengeId: z.number(),
+            options: z.any(), // PublicKeyCredentialCreationOptionsJSON
+          })
+        ),
+      verifyRegistration: oc
+        .input(
+          z.object({
+            challengeId: z.number(),
+            response: z.any(), // RegistrationResponseJSON
+          })
+        )
+        .output(z.void()),
+      createAuthenticationOptions: oc.output(
+        z.object({
+          challengeId: z.number(),
+          options: z.any(), // PublicKeyCredentialRequestOptionsJSON
+        })
+      ),
+      verifyAuthentication: oc
+        .input(
+          z.object({
+            challengeId: z.number(),
+            response: z.any(), // AuthenticationResponseJSON
+          })
+        )
+        .output(z.void()),
+    }),
+  }),
+
+  me: oc.router({
+    // Profile
+    get: oc.output(userProfileSchema),
+    setupProfile: oc.input(setupProfileInputSchema).output(z.void()),
+    updateProfile: oc.input(updateProfileInputSchema).output(z.void()),
+    delete: oc.input(z.object({ password: z.string() })).output(z.void()),
+
+    // Authentication settings
+    setPassword: oc.input(setPasswordInputSchema).output(z.void()),
+    listPasskeys: oc.output(z.array(passkeyOutputSchema)),
+    createPasskey: oc
+      .input(z.object({ name: z.string() }))
+      .output(
+        z.object({
+          challengeId: z.number(),
+          options: z.any(), // PublicKeyCredentialCreationOptionsJSON
+        })
+      ),
+    renamePasskey: oc
+      .input(z.object({ passkeyId: z.number(), name: z.string() }))
+      .output(z.void()),
+    deletePasskey: oc.input(z.object({ passkeyId: z.number() })).output(z.void()),
+
+    // Sessions & devices
+    listSessions: oc.output(z.array(sessionOutputSchema)),
+    revokeSession: oc.input(z.object({ sessionId: z.number() })).output(z.void()),
+    revokeAllSessions: oc.output(z.void()),
+    getDeviceInfo: oc.output(deviceOutputSchema),
+    trustDevice: oc.input(trustDeviceInputSchema).output(z.void()),
+    listTrustedDevices: oc.output(z.array(deviceOutputSchema)),
+    untrustDevice: oc.input(z.object({ deviceId: z.number() })).output(z.void()),
+    revokeAllTrustedDevices: oc.output(z.void()),
+  }),
+
+  orgs: oc.router({
+    // Org management
+    list: oc.output(z.array(orgOutputSchema)),
+    create: oc
+      .input(createOrgInputSchema)
+      .output(z.object({ slug: z.string() })),
+    get: oc.input(z.object({ slug: slugSchema })).output(orgOutputSchema),
+    update: oc
+      .input(
+        z.object({
+          slug: slugSchema,
+          displayName: z.string().optional(),
+          logoUrl: z.string().optional(),
+        })
+      )
+      .output(z.void()),
+    delete: oc.input(z.object({ slug: slugSchema })).output(z.void()),
+    leave: oc.input(z.object({ slug: slugSchema })).output(z.void()),
+
+    // Members
+    members: oc.router({
+      list: oc
+        .input(z.object({ slug: slugSchema }))
+        .output(z.array(orgMemberOutputSchema)),
+      updateRole: oc.input(updateMemberRoleInputSchema).output(z.void()),
+      remove: oc
+        .input(z.object({ slug: slugSchema, userId: z.number() }))
+        .output(z.void()),
+    }),
+
+    // Invites
+    invites: oc.router({
+      list: oc
+        .input(z.object({ slug: slugSchema }))
+        .output(z.array(orgInviteOutputSchema)),
+      create: oc.input(createInviteInputSchema).output(z.void()),
+      cancel: oc
+        .input(z.object({ slug: slugSchema, inviteId: z.number() }))
+        .output(z.void()),
+      accept: oc.input(z.object({ token: z.string() })).output(z.void()),
+    }),
+
+    // Sites
+    sites: oc.router({
+      list: oc
+        .input(z.object({ slug: slugSchema }))
+        .output(z.array(orgSiteOutputSchema)),
+    }),
+  }),
+
+  admin: oc.router({
+    // Admin org management
+    orgs: oc.router({
+      list: oc.output(z.array(orgOutputSchema)),
+      get: oc.input(z.object({ slug: slugSchema })).output(orgOutputSchema),
+      create: oc
+        .input(adminCreateOrgInputSchema)
+        .output(z.object({ slug: z.string() })),
+      update: oc
+        .input(
+          z.object({
+            slug: slugSchema,
+            displayName: z.string().optional(),
+            logoUrl: z.string().optional(),
+          })
+        )
+        .output(z.void()),
+      delete: oc.input(z.object({ slug: slugSchema })).output(z.void()),
+      listSites: oc
+        .input(z.object({ slug: slugSchema }))
+        .output(z.array(orgSiteOutputSchema)),
+      addSite: oc.input(adminAddSiteInputSchema).output(z.void()),
+      removeSite: oc
+        .input(z.object({ slug: slugSchema, domain: z.string() }))
+        .output(z.void()),
+    }),
+
+    // Admin user management
+    users: oc.router({
+      list: oc.output(z.array(userProfileSchema)),
+      get: oc.input(z.object({ email: emailSchema })).output(userProfileSchema),
+      create: oc.input(adminCreateUserInputSchema).output(z.void()),
+      update: oc.input(adminUpdateUserInputSchema).output(z.void()),
+      confirmEmail: oc.input(z.object({ email: emailSchema })).output(z.void()),
+    }),
+
+    // Admin auth management
+    auth: oc.router({
+      completeLogin: oc.input(z.object({ email: emailSchema })).output(z.void()),
+    }),
+  }),
+});
diff --git a/packages/api-contract/src/index.ts b/packages/api-contract/src/index.ts
new file mode 100644
index 0000000..ef84782
--- /dev/null
+++ b/packages/api-contract/src/index.ts
@@ -0,0 +1,9 @@
+// Export the contract
+export { contract } from "./contract.js";
+
+// Export all schemas
+export * from "./schemas/common.js";
+export * from "./schemas/auth.js";
+export * from "./schemas/user.js";
+export * from "./schemas/org.js";
+export * from "./schemas/admin.js";
diff --git a/packages/api-contract/src/schemas/admin.ts b/packages/api-contract/src/schemas/admin.ts
new file mode 100644
index 0000000..b3e05db
--- /dev/null
+++ b/packages/api-contract/src/schemas/admin.ts
@@ -0,0 +1,42 @@
+import { z } from "zod";
+import { emailSchema, slugSchema } from "./common.js";
+import { orgRoleSchema } from "./org.js";
+
+/**
+ * Admin create org input schema
+ * Superusers can create orgs and assign an owner
+ */
+export const adminCreateOrgInputSchema = z.object({
+  slug: slugSchema,
+  displayName: z.string().min(1).max(100),
+  ownerEmail: emailSchema,
+});
+
+/**
+ * Admin create user input schema
+ * Superusers can create passwordless users
+ */
+export const adminCreateUserInputSchema = z.object({
+  email: emailSchema,
+  name: z.string().optional(),
+  orgSlug: slugSchema.optional(),
+  orgRole: orgRoleSchema.optional(),
+});
+
+/**
+ * Admin update user input schema
+ * Superusers can update user properties like is_superuser
+ */
+export const adminUpdateUserInputSchema = z.object({
+  email: emailSchema,
+  isSuperuser: z.boolean().optional(),
+});
+
+/**
+ * Admin add site input schema
+ * Superusers can add sites to orgs
+ */
+export const adminAddSiteInputSchema = z.object({
+  slug: slugSchema,
+  domain: z.string(),
+});
diff --git a/packages/api-contract/src/schemas/auth.ts b/packages/api-contract/src/schemas/auth.ts
new file mode 100644
index 0000000..d62322a
--- /dev/null
+++ b/packages/api-contract/src/schemas/auth.ts
@@ -0,0 +1,82 @@
+import { z } from "zod";
+import { emailSchema } from "./common.js";
+
+/**
+ * Passkey information schema for signup and registration
+ * challengeId references the webauthn_challenges table
+ * response is the RegistrationResponseJSON from @simplewebauthn/browser
+ */
+export const passkeyInfoSchema = z.object({
+  challengeId: z.number(),
+  response: z.any(), // RegistrationResponseJSON from @simplewebauthn/browser
+});
+
+/**
+ * Signup input schema
+ * Must provide either password or passkeyInfo
+ */
+export const signupInputSchema = z
+  .object({
+    email: emailSchema,
+    password: z.string().min(8).optional(),
+    passkeyInfo: passkeyInfoSchema.optional(),
+  })
+  .refine((data) => data.password || data.passkeyInfo, {
+    message: "Either password or passkeyInfo is required",
+  });
+
+/**
+ * Login request input schema (step 1 of login)
+ */
+export const loginRequestInputSchema = z.object({
+  email: emailSchema,
+});
+
+/**
+ * Login request output schema
+ * Indicates available auth methods and device trust status
+ */
+export const loginRequestOutputSchema = z.object({
+  hasPasskey: z.boolean(),
+  hasPassword: z.boolean(),
+  isTrustedDevice: z.boolean(),
+  email: z.string(),
+});
+
+/**
+ * Login with password input schema
+ */
+export const loginPasswordInputSchema = z.object({
+  password: z.string(),
+});
+
+/**
+ * Login status output schema
+ * Used for polling login completion
+ */
+export const loginStatusOutputSchema = z.object({
+  status: z.enum(["pending", "completed", "expired"]),
+  redirectTo: z.string().optional(),
+});
+
+/**
+ * Verify email input schema
+ */
+export const verifyEmailInputSchema = z.object({
+  token: z.string(),
+});
+
+/**
+ * Forgot password input schema
+ */
+export const forgotPasswordInputSchema = z.object({
+  email: emailSchema,
+});
+
+/**
+ * Reset password input schema
+ */
+export const resetPasswordInputSchema = z.object({
+  token: z.string(),
+  newPassword: z.string().min(8),
+});
diff --git a/packages/api-contract/src/schemas/common.ts b/packages/api-contract/src/schemas/common.ts
new file mode 100644
index 0000000..d807841
--- /dev/null
+++ b/packages/api-contract/src/schemas/common.ts
@@ -0,0 +1,35 @@
+import { parsePhoneNumberWithError, isValidPhoneNumber } from "libphonenumber-js";
+import { z } from "zod";
+
+/**
+ * Email schema - validates email format and transforms to lowercase
+ */
+export const emailSchema = z.string().email().toLowerCase() satisfies z.ZodTypeAny;
+
+/**
+ * Slug schema for org slugs
+ * Must be 2-63 chars, lowercase alphanumeric with hyphens (not at start/end)
+ */
+export const slugSchema = z
+  .string()
+  .min(2)
+  .max(63)
+  .regex(/^[a-z0-9]([a-z0-9-]*[a-z0-9])?$/, {
+    message: "Slug must be lowercase alphanumeric with hyphens (not at start/end)",
+  });
+
+/**
+ * Phone number schema - validates and transforms to E.164 format
+ * Optional field, transforms to undefined if not provided
+ */
+export const phoneSchema = z
+  .string()
+  .optional()
+  .transform((val) => {
+    if (!val) return undefined;
+    const phone = parsePhoneNumberWithError(val);
+    return phone.format("E.164"); // +14155551234
+  })
+  .refine((val) => !val || isValidPhoneNumber(val), {
+    message: "Invalid phone number",
+  });
diff --git a/packages/api-contract/src/schemas/org.ts b/packages/api-contract/src/schemas/org.ts
new file mode 100644
index 0000000..c503933
--- /dev/null
+++ b/packages/api-contract/src/schemas/org.ts
@@ -0,0 +1,81 @@
+import { z } from "zod";
+import { emailSchema, slugSchema } from "./common.js";
+
+/**
+ * Org member role enum
+ */
+export const orgRoleSchema = z.enum(["owner", "admin", "member"]);
+
+/**
+ * Create org input schema
+ */
+export const createOrgInputSchema = z.object({
+  slug: slugSchema,
+  displayName: z.string().min(1).max(100),
+});
+
+/**
+ * Org output schema
+ * Returned by orgs.list, orgs.get, etc.
+ */
+export const orgOutputSchema = z.object({
+  id: z.number(),
+  slug: z.string(),
+  displayName: z.string(),
+  logoUrl: z.string().nullable(),
+  createdAt: z.date(),
+});
+
+/**
+ * Org member output schema
+ * Returned by orgs.members.list
+ */
+export const orgMemberOutputSchema = z.object({
+  id: z.number(),
+  userId: z.number(),
+  email: z.string(),
+  displayName: z.string().nullable(),
+  role: orgRoleSchema,
+  createdAt: z.date(),
+});
+
+/**
+ * Update member role input schema
+ */
+export const updateMemberRoleInputSchema = z.object({
+  slug: slugSchema,
+  userId: z.number(),
+  role: orgRoleSchema,
+});
+
+/**
+ * Create invite input schema
+ */
+export const createInviteInputSchema = z.object({
+  slug: slugSchema,
+  email: emailSchema,
+  role: orgRoleSchema,
+});
+
+/**
+ * Org invite output schema
+ * Returned by orgs.invites.list
+ */
+export const orgInviteOutputSchema = z.object({
+  id: z.number(),
+  email: z.string(),
+  role: orgRoleSchema,
+  invitedBy: z.string(),
+  createdAt: z.date(),
+  expiresAt: z.date(),
+});
+
+/**
+ * Org site output schema
+ * Returned by orgs.sites.list
+ */
+export const orgSiteOutputSchema = z.object({
+  id: z.number(),
+  domain: z.string(),
+  createdAt: z.date(),
+});
diff --git a/packages/api-contract/src/schemas/user.ts b/packages/api-contract/src/schemas/user.ts
new file mode 100644
index 0000000..f7af74a
--- /dev/null
+++ b/packages/api-contract/src/schemas/user.ts
@@ -0,0 +1,99 @@
+import { z } from "zod";
+import { phoneSchema } from "./common.js";
+
+/**
+ * User profile schema
+ * Returned by me.get and other profile endpoints
+ */
+export const userProfileSchema = z.object({
+  id: z.number(),
+  email: z.string(),
+  displayName: z.string().nullable(),
+  fullName: z.string().nullable(),
+  phoneNumber: z.string().nullable(),
+  avatarUrl: z.string().nullable(),
+  emailVerified: z.boolean(),
+  needsSetup: z.boolean(),
+  isSuperuser: z.boolean(),
+});
+
+/**
+ * Setup profile input schema
+ * Used after signup to collect profile information
+ */
+export const setupProfileInputSchema = z.object({
+  displayName: z.string().min(1).max(100),
+  fullName: z.string().max(200).optional(),
+  phoneNumber: phoneSchema,
+});
+
+/**
+ * Update profile input schema
+ * All fields optional for partial updates
+ */
+export const updateProfileInputSchema = z.object({
+  displayName: z.string().min(1).max(100).optional(),
+  fullName: z.string().max(200).optional(),
+  phoneNumber: phoneSchema,
+  avatarUrl: z.string().optional(),
+});
+
+/**
+ * Set password input schema
+ * currentPassword required if user already has a password
+ */
+export const setPasswordInputSchema = z.object({
+  currentPassword: z.string().optional(),
+  newPassword: z.string().min(8),
+});
+
+/**
+ * Passkey output schema
+ * Returned by me.listPasskeys
+ */
+export const passkeyOutputSchema = z.object({
+  id: z.number(),
+  name: z.string(),
+  createdAt: z.date(),
+  lastUsedAt: z.date().nullable(),
+});
+
+/**
+ * Session output schema
+ * Returned by me.listSessions
+ */
+export const sessionOutputSchema = z.object({
+  id: z.number(),
+  ip: z.string(),
+  city: z.string().nullable(),
+  region: z.string().nullable(),
+  country: z.string().nullable(),
+  userAgent: z.string(),
+  trustedMode: z.boolean(),
+  createdAt: z.date(),
+  isCurrent: z.boolean(),
+  revokedAt: z.date().nullable(),
+});
+
+/**
+ * Device output schema
+ * Returned by me.getDeviceInfo and me.listTrustedDevices
+ */
+export const deviceOutputSchema = z.object({
+  id: z.number(),
+  name: z.string(),
+  ip: z.string(),
+  city: z.string().nullable(),
+  region: z.string().nullable(),
+  country: z.string().nullable(),
+  lastUsedAt: z.date(),
+  isTrusted: z.boolean(),
+});
+
+/**
+ * Trust device input schema
+ * Used to name and trust the current device
+ */
+export const trustDeviceInputSchema = z.object({
+  name: z.string().min(1).max(100),
+});
diff --git a/packages/api-contract/tsconfig.json b/packages/api-contract/tsconfig.json
new file mode 100644
index 0000000..0ba618a
--- /dev/null
+++ b/packages/api-contract/tsconfig.json
@@ -0,0 +1,12 @@
+{
+  "extends": "@macalinao/tsconfig/tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "declaration": true,
+    "declarationMap": true,
+    "isolatedDeclarations": false
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}