clerk-cost-tuning

Optimize Clerk costs and understand pricing. Use when planning budget, reducing costs, or understanding Clerk pricing model. Trigger with phrases like "clerk cost", "clerk pricing", "reduce clerk cost", "clerk billing", "clerk budget".

Quality

77%

Does it follow best practices?

Impact

Pending

No eval scenarios have been run

Securityby

Passed

No known issues

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Clerk Cost Tuning

Overview

Understand Clerk pricing and optimize costs. Clerk charges by Monthly Active Users (MAU). Covers pricing tiers, MAU reduction strategies, caching to reduce API calls, and usage monitoring.

Prerequisites

Clerk account active
Understanding of MAU (Monthly Active Users)
Application usage patterns known

Instructions

Step 1: Understand Clerk Pricing Model

Plan	Price	MAU Included	Extra MAU
Free	$0/mo	10,000 MAU	N/A
Pro	$25/mo	10,000 MAU	$0.02/MAU
Enterprise	Custom	Custom	Custom

Key pricing concepts:

MAU = unique user who authenticates at least once per month
Users who only visit public pages are not counted
Bot/crawler sessions are not counted
Test/development instances are free and unlimited

Step 2: Reduce MAU Count

// Strategy 1: Defer authentication — don't force sign-in until necessary
// middleware.ts
import { clerkMiddleware, createRouteMatcher } from '@clerk/nextjs/server'

const requiresAuth = createRouteMatcher([
  '/dashboard(.*)',
  '/settings(.*)',
  '/api/protected(.*)',
])

export default clerkMiddleware(async (auth, req) => {
  // Only require auth for specific routes (not entire site)
  if (requiresAuth(req)) {
    await auth.protect()
  }
})

// Strategy 2: Use anonymous access for read-only features
// app/blog/[slug]/page.tsx
import { auth } from '@clerk/nextjs/server'

export default async function BlogPost({ params }: { params: { slug: string } }) {
  const { userId } = await auth() // Check but don't require
  const post = await db.post.findUnique({ where: { slug: params.slug } })

  return (
    <article>
      <h1>{post?.title}</h1>
      <div>{post?.content}</div>
      {userId ? <CommentForm /> : <p>Sign in to comment</p>}
    </article>
  )
}

Step 3: Cache to Reduce API Calls

// lib/user-cache.ts
import { cache } from 'react'
import { currentUser } from '@clerk/nextjs/server'

// Deduplicate within single request (free)
export const getUser = cache(async () => {
  return currentUser()
})

// Cross-request caching reduces Backend API calls
import { unstable_cache } from 'next/cache'
import { clerkClient } from '@clerk/nextjs/server'

export const getUserMetadata = unstable_cache(
  async (userId: string) => {
    const client = await clerkClient()
    const user = await client.users.getUser(userId)
    return user.publicMetadata
  },
  ['user-metadata'],
  { revalidate: 600 } // 10-minute cache
)

Step 4: Monitor Usage

// app/api/admin/clerk-usage/route.ts
import { auth, clerkClient } from '@clerk/nextjs/server'

export async function GET() {
  const { has } = await auth()
  if (!has({ role: 'org:admin' })) {
    return Response.json({ error: 'Admin only' }, { status: 403 })
  }

  const client = await clerkClient()
  const users = await client.users.getUserList({ limit: 1 })

  return Response.json({
    totalUsers: users.totalCount,
    // Estimate MAU based on recent sign-ins
    estimatedMAU: 'Check Clerk Dashboard > Billing for actual MAU',
    dashboardUrl: 'https://dashboard.clerk.com/last-active?after=30d',
  })
}

Step 5: Clean Up Inactive Users

// scripts/cleanup-inactive-users.ts
import { createClerkClient } from '@clerk/backend'

const clerk = createClerkClient({ secretKey: process.env.CLERK_SECRET_KEY! })

async function findInactiveUsers(daysInactive = 90) {
  const cutoff = Date.now() - daysInactive * 24 * 60 * 60 * 1000
  const allUsers = await clerk.users.getUserList({ limit: 500 })

  const inactive = allUsers.data.filter(
    (user) => (user.lastSignInAt || 0) < cutoff
  )

  console.log(`Found ${inactive.length} users inactive for ${daysInactive}+ days`)
  console.log('Consider: notification campaign, data export, or account cleanup')

  return inactive
}

findInactiveUsers()

Output

Pricing model understood with MAU thresholds
Route-level auth to minimize unnecessary MAU counts
Request-level and cross-request caching reducing API calls
Usage monitoring endpoint for admins
Inactive user identification script

Error Handling

Issue	Cause	Solution
Unexpected bill increase	MAU spike from bot traffic	Add bot detection, restrict auth to needed routes
Feature limitations	Free tier limits (no SSO, etc.)	Upgrade to Pro ($25/mo)
High API call volume	No caching	Add React `cache()` + `unstable_cache()`
MAU count mismatch	Counting test users	Use separate dev instance (free, unlimited)

Examples

Cost Estimation Script

function estimateMonthlyCost(mau: number): string {
  if (mau <= 10_000) return 'Free tier ($0/mo)'
  const overage = mau - 10_000
  const cost = 25 + overage * 0.02
  return `Pro tier: $${cost.toFixed(2)}/mo (${overage.toLocaleString()} extra MAU at $0.02 each)`
}

console.log(estimateMonthlyCost(15_000))  // "Pro tier: $125.00/mo (5,000 extra MAU at $0.02 each)"
console.log(estimateMonthlyCost(50_000))  // "Pro tier: $825.00/mo (40,000 extra MAU at $0.02 each)"

Resources

Next Steps

Proceed to clerk-reference-architecture for architecture patterns.

Repository: jeremylongshore/claude-code-plugins-plus-skills
Commit: 3e83543

Last updated: 2 days ago
Created: 2 days ago

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