Supabase Rate Limits

Supabase Rate Limits

Overview

Supabase enforces rate limits and quotas across every API surface — PostgREST, Auth, Storage, Realtime, and Edge Functions. Limits scale by plan tier. This skill covers the exact numbers per tier, connection pooling via Supavisor, retry/​backoff patterns, pagination to reduce payload, and dashboard monitoring so you can stay within quotas and handle 429 errors gracefully.

Prerequisites

• Active Supabase project (any tier)
• @supabase/​supabase-js v2+ installed
• Project URL and anon/​service-role key available
• Node.js 18+ or equivalent runtime

Instructions

Step 1 — Understand Rate Limits by Tier and Surface

Every Supabase project has per-surface limits that differ by plan. Know these numbers before you architect:

API Request Limits

Auth Rate Limits

Auth limits are per-IP and per-user. Configure custom limits in Dashboard > Authentication > Rate Limits.

Storage Bandwidth

Realtime Connections

Edge Functions

Database Connections

Step 2 — Configure Connection Pooling with Supavisor

Supavisor is Supabase's built-in connection pooler (replaced PgBouncer). It supports two modes:

Transaction mode (port 6543) — recommended for serverless:

import { createClient } from '@supabase/​supabase-js'

// Transaction mode: connections returned to pool after each transaction
// Best for: serverless functions, Edge Functions, high-concurrency apps
const supabase = createClient(
  'https://your-project.supabase.co',
  process.env.SUPABASE_ANON_KEY!,
  {
    db: {
      // Use the pooler connection string with port 6543
      // Format: postgresql://postgres.[ref]:[password]@aws-0-[region].pooler.supabase.com:6543/​postgres
    }
  }
)

// For direct Postgres connections (e.g., Prisma, Drizzle), add pgbouncer=true
// Connection string: postgresql://[email protected]:6543/​postgres?pgbouncer=true

Session mode (port 5432) — for LISTEN/​NOTIFY and prepared statements:

// Session mode: dedicated connection per client session
// Best for: long-lived connections, LISTEN/​NOTIFY, prepared statements
// Connection string: postgresql://[email protected]:5432/​postgres

When to use which mode:

Step 3 — Implement Retry, Pagination, and Monitoring

Retry with exponential backoff for 429 errors:

import { createClient, SupabaseClient } from '@supabase/​supabase-js'

const supabase = createClient(
  process.env.SUPABASE_URL!,
  process.env.SUPABASE_ANON_KEY!
)

interface RetryConfig {
  maxRetries: number
  baseDelayMs: number
  maxDelayMs: number
}

async function withRetry<T>(
  operation: () => Promise<{ data: T | null; error: any }>,
  config: RetryConfig = { maxRetries: 3, baseDelayMs: 500, maxDelayMs: 10_000 }
): Promise<T> {
  for (let attempt = 0; attempt <= config.maxRetries; attempt++) {
    const { data, error } = await operation()

    if (!error) return data as T

    const isRetryable =
      error.message?.includes('rate limit') ||
      error.message?.includes('too many requests') ||
      error.code === '429' ||
      error.code === 'PGRST000'  // connection pool exhausted

    if (!isRetryable || attempt === config.maxRetries) {
      throw new Error(`Supabase error after ${attempt + 1} attempts: ${error.message}`)
    }

    // Check Retry-After header if available
    const retryAfter = error.details?.retryAfter
    const delay = retryAfter
      ? retryAfter * 1000
      : Math.min(
          config.baseDelayMs * Math.pow(2, attempt) + Math.random() * 200,
          config.maxDelayMs
        )

    console.warn(`[supabase-retry] Attempt ${attempt + 1}/​${config.maxRetries}, waiting ${delay}ms`)
    await new Promise((resolve) => setTimeout(resolve, delay))
  }

  throw new Error('Unreachable')
}

// Usage — wraps any Supabase query
const users = await withRetry(() =>
  supabase.from('users').select('id, email, created_at').eq('active', true)
)

Pagination to reduce payload and stay within limits:

// Use .range() to paginate — reduces response size and avoids timeouts
async function fetchPaginated<T>(
  table: string,
  pageSize = 100,
  filters?: (query: any) => any
): Promise<T[]> {
  const allRows: T[] = []
  let from = 0

  while (true) {
    let query = supabase.from(table).select('*', { count: 'exact' })
    if (filters) query = filters(query)

    const { data, error, count } = await query.range(from, from + pageSize - 1)

    if (error) throw error
    if (!data || data.length === 0) break

    allRows.push(...(data as T[]))
    from += pageSize

    // Stop if we've fetched everything
    if (count !== null && from >= count) break
  }

  return allRows
}

// Usage
const allProducts = await fetchPaginated('products', 100, (q) =>
  q.eq('status', 'active').order('created_at', { ascending: false })
)

// Simple single-page fetch with .range()
const { data } = await supabase
  .from('orders')
  .select('id, total, status')
  .range(0, 99)  // First 100 rows (0-indexed)
  .order('created_at', { ascending: false })

Monitor usage via the Dashboard:

1. Navigate to Dashboard > Reports > API Usage
2. Check the "API Requests" chart for RPM/​RPD trends
3. Review "Database" section for connection count and pool utilization
4. Set up alerts in Dashboard > Settings > Notifications for:
   • API request threshold (e.g., 80% of RPM limit)
   • Database connection saturation
   • Storage bandwidth approaching limit

Batch operations to reduce request count:

// BAD: N individual inserts = N requests against your RPM
// for (const item of items) await supabase.from('items').insert(item)

// GOOD: single batch insert (max ~1000 rows per request)
const { data, error } = await supabase
  .from('items')
  .upsert(batchOfItems, { onConflict: 'external_id' })
  .select()

// For larger batches, chunk into groups
function chunk<T>(arr: T[], size: number): T[][] {
  return Array.from({ length: Math.ceil(arr.length / size) }, (_, i) =>
    arr.slice(i * size, i * size + size)
  )
}

for (const batch of chunk(largeDataset, 500)) {
  await withRetry(() =>
    supabase.from('items').upsert(batch, { onConflict: 'external_id' }).select()
  )
}

Output

After applying this skill you will have:

• Clear understanding of rate limits per tier (Free: 500 RPM / 50K RPD, Pro: 5K RPM / 1M RPD)
• Connection pooling configured via Supavisor (port 6543 transaction mode for serverless)
• Retry wrapper with exponential backoff handling 429 errors
• Paginated queries using .range(0, 99) to reduce payload size
• Batch upsert pattern reducing N requests to 1
• Dashboard monitoring configured for API usage alerts

Error Handling

Examples

Example 1 — Serverless Edge Function with rate-limit-safe client:

// supabase/​functions/​process-webhook/​index.ts
import { serve } from 'https://deno.land/​[email protected]/​http/​server.ts'
import { createClient } from 'https://esm.sh/​@supabase/​supabase-js@2'

serve(async (req) => {
  const supabase = createClient(
    Deno.env.get('SUPABASE_URL')!,
    Deno.env.get('SUPABASE_SERVICE_ROLE_KEY')!
  )

  const payload = await req.json()

  // Batch insert webhook events (single request vs N)
  const { error } = await supabase
    .from('webhook_events')
    .insert(payload.events.map((e: any) => ({
      type: e.type,
      data: e.data,
      received_at: new Date().toISOString(),
    })))

  if (error) {
    console.error('Insert failed:', error.message)
    return new Response(JSON.stringify({ error: error.message }), { status: 500 })
  }

  return new Response(JSON.stringify({ processed: payload.events.length }), { status: 200 })
})

Example 2 — Connection string selection for different runtimes:

# Serverless (Vercel, Netlify, Edge Functions) — transaction mode
DATABASE_URL="postgresql://postgres.abc123:[email protected]:6543/​postgres?pgbouncer=true"

# Long-running server (Express, Fastify) — session mode
DATABASE_URL="postgresql://postgres.abc123:[email protected]:5432/​postgres"

# Direct connection (migrations, schema changes only)
DATABASE_URL="postgresql://postgres:[email protected]:5432/​postgres"

Resources

• Supabase Platform Limits & Quotas
• Supavisor Connection Pooling
• Auth Rate Limits Configuration
• Edge Functions Limits
• Storage Limits
• @supabase/​supabase-js Reference

Next Steps

For securing your Supabase project with RLS policies and API key management, see supabase-security-basics. For optimizing database queries and indexing, see supabase-performance-tuning.