Dead LetterWebhook recovery
Get Started

Webhook recovery platform

Stop losing webhooks.

Dead Letter relays every webhook, retries every failure, and replays it when your server recovers. No payloads lost. No glue code.

Runs on its own infrastructure, so your outages can't take our queue down.

Start FreeSee How It Works

No credit card required · 100k events/mo free

DeliveryAt-least-once
SignaturesEvery payload
SetupIn minutes
IsolationSeparate infra
Delivery ReceiptDL-38472
ENDPOINT    /ingest/acme-payments
STATUS      DELIVERED ✓
ATTEMPTS    3 of 5
LATENCY     240ms
SIGNATURE   verified
NEXT        —
Recovered after 2 failed attempts
How it works

Four recorded handoffs. No glue code.

From a webhook source to a recovered delivery, every transition has an owner and a record.

LOT 01

Point

Point your provider's webhook URL at your deadletter.io slug.

LOT 02

Ingest

We sign, validate, and queue the payload durably.

LOT 03

Deliver

We POST to your destination with retry and exponential backoff.

LOT 04

Recover

Inspect, replay, or reroute anything that fails.

Simulation lab

How it works

When your server goes down, webhooks don't have to be lost. See how Dead Letter catches, queues, and replays every payload automatically.

Stripe

Provider

Dead Letter

ProxyRECEIVING

Your App

Destination
ONLINE

Webhook dispatched

A payment provider fires a webhook event. Dead Letter receives and acknowledges it immediately.

Signature desk

Trust, but verify

Test your payload signatures securely in your browser.

Interactive Signature Generator

Dead Letter secures your webhooks by signing them with a unique secret key.
Verify your backend code by generating identical HMAC-SHA256 signatures here.

Webhook Payload
Endpoint Secret Key 100% Local (Safe)
Generated Signature (HMAC-SHA256)

Why a secret?Webhook URLs are public. To prove a webhook genuinely came from Dead Letter (and not a malicious actor), we generate this signature using a secret password known only to you. Your server re-calculates the signature and blocks the request if it doesn't match perfectly.

Platform Features

Production-Ready Architecture

Built from scratch to handle millions of payloads with absolute security.

SEC-01

SSRF Protection

Sandboxed execution blocking private internal subnets, keeping webhooks protected from redirect and DNS rebinding SSRF exploits.

OPS-02

Custom Retry Policies

Fine-tune automatic retry triggers, backoff algorithms, and jitter constants to optimize traffic without overloading database structures.

KEY-03

Workspace API Keys

Generate secure write-only tokens to interact programmatically with retry states, endpoints configuration, and delivery logs.

SIG-04

Cryptographic Signatures

Ensure data integrity with HMAC SHA-256 signatures attached to every payload, preventing spoofing and malicious requests.

OBS-05

Real-Time Dashboard

Monitor live webhooks and failures instantly through our high-performance Server-Sent Events (SSE) streaming architecture.

ALT-06

Automated Alerting

Receive instant notifications in Slack or Discord whenever a webhook exhausts all retries and transitions to a permanent failure.

Pricing

Simple, Transparent Pricing

Select the pricing tier that scales with your webhook delivery volume and security requirements.

99.99% ingestion uptime · cancel anytime

SANDBOX

Free

Ideal for local development and minor webhook integrations.

$0forever

  • Max 3 endpoints
  • 100k events/mo (10 req/s max)
  • 1 member (owner only)
  • 7 days event retention
  • Console dashboard access
  • Standard retry intervals
  • Custom retry schedules
  • API keys control plane access
  • Sandboxed worker VPC isolation
  • Priority alert support
Get Started Free

Cancel anytime

PRODUCTIONMost Popular

Pro

Perfect for scaling startups and production webhook traffic.

$29/month

  • Max 50 endpoints
  • 1M events/mo (100 req/s max)
  • Up to 10 members
  • 30 days event retention
  • Console dashboard access
  • Advanced custom retry schedules
  • API keys control plane access
  • Priority email alert support
  • Sandboxed worker VPC isolation
  • 24/7 dedicated support
Go Pro Now

Cancel anytime

HIGH SCALE

Enterprise

Built for mission-critical services requiring absolute reliability.

$299/month

  • Unlimited endpoints
  • Custom volume (500 req/s max)
  • Unlimited members
  • 90 days event retention
  • Console dashboard access
  • Advanced custom retry schedules
  • API keys control plane access
  • Sandboxed worker VPC isolation
  • 24/7 dedicated support
  • Custom signature headers
Get Enterprise

Cancel anytime