Stripe retries with exponential backoff for days, but constant 500 errors will eventually lock your endpoint. Use us as a secondary safe-haven. HookSentinel captures raw byte payloads into an encrypted Dead-Letter Queue and lets you replay failed events directly to production β or forward them to localhost via hs listen for instant debugging.
HookSentinel processes payloads strictly at the raw byte buffer level. It never mutates HTTP headers or re-serializes JSON, ensuring cryptographic signatures from Stripe, Shopify, and GitHub always pass verification.
All buffered webhook payloads in the Dead Letter Queue (DLQ) are encrypted at rest with AES-256 and transmitted exclusively over TLS 1.3.
"At 3:15 AM on a Sunday, our product launched on Hacker News. Traffic surged 10x. Our database connection pool saturated, and our /api/webhooks/stripe endpoint began throwing HTTP 500 errors.
Stripe retried the failed webhooks over the next hour. Because the database was still recovering, every retry failed. Stripe then marked our webhook endpoint as unhealthy and stopped sending events entirely.
By morning, 42 customers had been charged, but zero accounts had been upgraded. We had to spend 6 hours manually inspecting Stripe dashboard logs and writing throwaway scripts to backfill the missing subscriptions.
Here is what happens when your server fails, and how you reproduce it on your local machine:
Stripe sends POST request with HMAC Stripe-Signature header to HookSentinel secondary proxy endpoint.
HookSentinel captures the exact raw JSON body, all original HMAC headers, returns 200 OK to Stripe to prevent endpoint ban, and alerts your Slack channel.
Never debug blindly in production. HookSentinel pushes the exact failed production payload into your local dev environment (http://localhost:3000/api/webhooks/stripe) with your debugger attached.
The event is cleanly processed on production without writing throwaway data backfill scripts.
HookSentinel forwards bytes without touching a single character. Standard SDK signature verification works out of the box:
// app/api/webhooks/stripe/route.ts
// 1. In Stripe Dashboard, set Webhook URL to HookSentinel secondary endpoint:
// https://www.hook-sentinel.tech/api/in/stripe-payments
// 2. HookSentinel relays the raw bytes untouched to your server (or localhost via 'hs listen'):
import { headers } from 'next/headers';
import Stripe from 'stripe';
const stripe = new Stripe(process.env.STRIPE_SECRET_KEY!);
export async function POST(req: Request) {
const body = await req.text(); // Raw buffer preserved exactly
const signature = (await headers()).get('stripe-signature')!;
try {
const event = stripe.webhooks.constructEvent(
body,
signature,
process.env.STRIPE_WEBHOOK_SECRET!
);
// Process event in your database or worker queue
return new Response('ok', { status: 200 });
} catch (err: any) {
// If your origin or database crashes with HTTP 500, HookSentinel DLQ buffers the event!
// Replay it with 1 click once the database is back up.
return new Response(err.message, { status: 500 });
}
}Webhook volume isn't always steady. If your usual 1-2 webhooks/sec suddenly spikes to 30 requests in seconds due to a card-testing bot or infinite loop bug, HookSentinel immediately flags the spike and dispatches an alertβwithout ever dropping or blocking payloads.
Sliding-window velocity monitoring alerts your team the moment incoming rate surges beyond expected thresholds.
Legitimate customer payments are never dropped. All incoming requests are safely relayed and stored in the DLQ buffer.
Instant webhook alerts sent to your team's on-call channel with the route slug, request rate, and provider details.
Stop juggling temporary ngrok URLs and re-registering webhooks in your Stripe dashboard every time you restart your dev server. With one simple terminal command (hs listen 3000), mirror live production webhooks straight to your local code.
Architectural questions asked by developers:
No sales calls. Cancel anytime.
For side projects and localhost development.
Reliable secondary safe-haven and replay engine for production apps.
For high-volume webhook workloads.