# HookSense

> Real-time webhook inspector and debugger for developers shipping Stripe, GitHub, Shopify, and other webhook integrations. One endpoint for the whole life of an integration — from first test to production: WebSocket-based capture (sub-50ms), one-click replay, side-by-side request diff, built-in HMAC signature verification, and a permanent URL that never expires. Free tier with 300 req/day; paid plans from $29/mo.

Last updated: 2026-07-26

## What is HookSense?

HookSense is a webhook testing and debugging platform for developers. It gives you an instant HTTPS endpoint that captures incoming webhooks in real time, displays the full request (headers, body, signatures) in a browser, lets you replay any request to any URL including localhost, and verifies HMAC signatures from Stripe, GitHub, Shopify and custom providers. Used by developers integrating with payment, e-commerce, CI/CD, and notification services.

No signup is required to start capturing webhooks — you get a permanent free URL in under 1 second.

## Why developers pick HookSense

- **Sub-50ms real-time delivery** via WebSocket — no polling, no manual refresh
- **One-click replay** to any URL (production, staging, or localhost)
- **HMAC verification built in** for Stripe, GitHub, Shopify, and custom providers
- **Side-by-side request diff** — compare any two payloads and see exactly what changed
- **Permanent free endpoints** — URLs don't expire or rotate
- **Generous free tier**: 300 requests/day, 14-day retention, no signup
- **No metered surprises**: hit your daily limit and requests are rejected with a 429 — never an unexpected bill
- **Custom responses, custom domains, search & filter, export as cURL/JSON**

## Pricing (2026-07-26)

- **Catch** ($0): 3 endpoints, 300 req/day, 14-day retention, personal use (no team), no signup required
- **Hook** ($29/mo or $290/yr): 15 endpoints, 5,000 req/day, 30-day retention, up to 3 team members, HMAC verification, custom URLs, custom responses, data export
- **Sense** ($99/mo or $990/yr): unlimited endpoints, 50,000 req/day, 90-day retention, up to 10 team members, everything in Hook + health dashboard, alerts (email + Slack/Discord), custom domains, automatic retry, auto-diagnosis

All plans include real-time WebSocket streaming, replay, and permanent endpoint URLs. There are no metered overage charges on any tier — exceeding your daily limit returns a 429 until midnight UTC.

## Supported Webhook Providers

HookSense works with any service that sends HTTP webhooks. Auto-detection and dedicated integration guides for:

- Stripe: https://hooksense.com/integrations/stripe
- GitHub: https://hooksense.com/integrations/github
- Shopify: https://hooksense.com/integrations/shopify
- Twilio: https://hooksense.com/integrations/twilio
- Clerk: https://hooksense.com/integrations/clerk
- SendGrid: https://hooksense.com/integrations/sendgrid
- Slack: https://hooksense.com/integrations/slack
- LemonSqueezy: https://hooksense.com/integrations/lemonsqueezy
- Paypal: https://hooksense.com/integrations/paypal
- Square: https://hooksense.com/integrations/square
- Paddle: https://hooksense.com/integrations/paddle
- Razorpay: https://hooksense.com/integrations/razorpay
- Polar: https://hooksense.com/integrations/polar
- Discord: https://hooksense.com/integrations/discord
- Gitlab: https://hooksense.com/integrations/gitlab
- Mailgun: https://hooksense.com/integrations/mailgun
- Meta: https://hooksense.com/integrations/meta
- Hubspot: https://hooksense.com/integrations/hubspot

Tester pages with provider-specific signature & event examples:

- Stripe Webhook Tester: https://hooksense.com/stripe-webhook-tester
- GitHub Webhook Tester: https://hooksense.com/github-webhook-tester
- Shopify Webhook Tester: https://hooksense.com/shopify-webhook-tester
- Twilio Webhook Tester: https://hooksense.com/twilio-webhook-tester
- Clerk Webhook Tester: https://hooksense.com/clerk-webhook-tester
- SendGrid Webhook Tester: https://hooksense.com/sendgrid-webhook-tester
- Slack Webhook Tester: https://hooksense.com/slack-webhook-tester
- LemonSqueezy Webhook Tester: https://hooksense.com/lemonsqueezy-webhook-tester
- Paypal Webhook Tester: https://hooksense.com/paypal-webhook-tester
- Square Webhook Tester: https://hooksense.com/square-webhook-tester
- Paddle Webhook Tester: https://hooksense.com/paddle-webhook-tester
- Razorpay Webhook Tester: https://hooksense.com/razorpay-webhook-tester
- Polar Webhook Tester: https://hooksense.com/polar-webhook-tester
- Discord Webhook Tester: https://hooksense.com/discord-webhook-tester
- Gitlab Webhook Tester: https://hooksense.com/gitlab-webhook-tester
- Mailgun Webhook Tester: https://hooksense.com/mailgun-webhook-tester
- Meta Webhook Tester: https://hooksense.com/meta-webhook-tester
- Hubspot Webhook Tester: https://hooksense.com/hubspot-webhook-tester

## How HookSense Compares

- HookSense vs Webhook.site: https://hooksense.com/compare/webhook-site
- HookSense vs WebhookDebugger: https://hooksense.com/compare/webhookdebugger
- HookSense vs Hookdeck: https://hooksense.com/compare/hookdeck
- HookSense vs ngrok: https://hooksense.com/compare/ngrok
- HookSense vs RequestBin (Pipedream): https://hooksense.com/compare/requestbin
- HookSense vs Beeceptor: https://hooksense.com/compare/beeceptor

## Use Cases

- Local Development: https://hooksense.com/use-cases/local-development
- Staging Debugging: https://hooksense.com/use-cases/staging-debugging
- QA Testing: https://hooksense.com/use-cases/qa-testing
- API Integrations: https://hooksense.com/use-cases/api-integrations
- Scaling Team: https://hooksense.com/use-cases/scaling-team

## Documentation (23 pages)

- **Getting Started** — Set up HookSense in minutes: capture and inspect incoming webhooks, verify HMAC signatures, replay requests, and forward to localhost. Plus MCP callbacks so AI agents await signed results instead of polling. https://hooksense.com/docs/getting-started
- **CLI** — Install the HookSense CLI and forward captured webhooks to your local dev server. Test Stripe, GitHub, and Shopify webhooks on localhost with one command — no tunnels, no ngrok. https://hooksense.com/docs/cli
- **API Reference** — Complete API reference for creating endpoints, listing requests, replaying webhooks, and more. https://hooksense.com/docs/api
- **Callback Capture** — Capture incoming webhooks and callbacks with full headers, body, and metadata — decrypted and ready for get_callback_payload. https://hooksense.com/docs/webhook-capture
- **Provider Detection** — Automatic detection of Stripe, GitHub, Shopify, Twilio, SendGrid, Paddle, Linear, and Slack webhooks based on headers and payload structure. https://hooksense.com/docs/provider-detection
- **Search & Filter** — Find captured webhooks by HTTP method, signature status, body content, and header values across full request history. https://hooksense.com/docs/search-filter
- **Replay** — Replay a captured callback to any target URL (or via replay_callback over MCP) for debugging and testing. https://hooksense.com/docs/replay
- **Compare** — Compare two webhook requests side by side to spot differences in headers, body, and metadata. https://hooksense.com/docs/compare
- **Signature Verification** — Verify HMAC signatures from Stripe, GitHub, Shopify, and custom providers automatically — exposed to agents as verify_signature. https://hooksense.com/docs/hmac
- **Custom URLs** — Use readable, branded slugs for your webhook endpoints instead of random IDs. https://hooksense.com/docs/custom-urls
- **Custom Responses** — Configure custom HTTP status codes, response bodies, and headers for your webhook endpoints. https://hooksense.com/docs/custom-responses
- **Custom Domains** — Use your own domain for webhook endpoints instead of the default hooksense.com URL. https://hooksense.com/docs/custom-domains
- **Endpoint Sharing** — Share read-only access to a webhook endpoint with teammates or auditors via a signed link. https://hooksense.com/docs/endpoint-sharing
- **Export** — Export captured webhook requests as JSON or CSV for analysis and record-keeping. https://hooksense.com/docs/export
- **Productivity** — Browser notifications, keyboard shortcuts (j/k navigation), and other power-user features for faster webhook debugging. https://hooksense.com/docs/productivity
- **Monitoring** — Monitor webhook endpoint health with uptime tracking, latency metrics, and status dashboards. https://hooksense.com/docs/monitoring
- **Alerts** — Set up email and webhook alerts for endpoint failures, high error rates, and anomalies. https://hooksense.com/docs/alerts
- **Retry** — Auto-retry failed callback deliveries with configurable backoff and a dead-letter queue (soon). https://hooksense.com/docs/retry
- **Diagnosis** — Diagnose webhook delivery issues with detailed error analysis and resolution suggestions. https://hooksense.com/docs/diagnosis
- **Analytics** — View request volume, response times, error rates, and traffic patterns for your endpoints. https://hooksense.com/docs/analytics
- **Teams** — Collaborate with your team by sharing endpoints, viewing shared request history, and managing roles. https://hooksense.com/docs/teams
- **Limits & Quotas** — Understand rate limits, request quotas, and retention policies for each HookSense plan. https://hooksense.com/docs/limits
- **MCP Server** — Give agents callbacks via the Model Context Protocol: create_callback_endpoint, wait_for_callback, get_callback_payload, and more from Claude Desktop, Cursor, or Claude Code. https://hooksense.com/docs/mcp

## Fixtures (real webhook payload examples)

- Stripe – Payment Intent Succeeded: https://hooksense.com/fixtures/stripe/payment-intent-succeeded
- Stripe – Customer Subscription Created: https://hooksense.com/fixtures/stripe/customer-subscription-created
- GitHub – Pull Request Opened: https://hooksense.com/fixtures/github/pull-request-opened
- GitHub – Push: https://hooksense.com/fixtures/github/push
- Shopify – Orders Create: https://hooksense.com/fixtures/shopify/orders-create
- Slack – Event Callback: https://hooksense.com/fixtures/slack/event-callback
- Twilio – SMS Received: https://hooksense.com/fixtures/twilio/sms-received
- SendGrid – Event: https://hooksense.com/fixtures/sendgrid/event
- LemonSqueezy – Order Created: https://hooksense.com/fixtures/lemonsqueezy/order-created
- Clerk – User Created: https://hooksense.com/fixtures/clerk/user-created

## Glossary (webhook concepts)

- Webhook: https://hooksense.com/glossary/webhook
- Payload: https://hooksense.com/glossary/payload
- Raw Body: https://hooksense.com/glossary/raw-body
- Dead Letter Queue: https://hooksense.com/glossary/dead-letter-queue
- At Least Once Delivery: https://hooksense.com/glossary/at-least-once-delivery
- Fan Out: https://hooksense.com/glossary/fan-out
- HMAC: https://hooksense.com/glossary/hmac
- Webhook Signature: https://hooksense.com/glossary/webhook-signature
- Signing Secret: https://hooksense.com/glossary/signing-secret
- Timestamp Tolerance: https://hooksense.com/glossary/timestamp-tolerance
- Replay Attack: https://hooksense.com/glossary/replay-attack
- Idempotency: https://hooksense.com/glossary/idempotency
- Retry Backoff: https://hooksense.com/glossary/retry-backoff
- Webhook Handshake: https://hooksense.com/glossary/webhook-handshake
- Event Gateway: https://hooksense.com/glossary/event-gateway
- Webhook Vs Polling: https://hooksense.com/glossary/webhook-vs-polling
- 2xx Response: https://hooksense.com/glossary/2xx-response
- Webhook Secret Rotation: https://hooksense.com/glossary/webhook-secret-rotation
- IP Allowlisting: https://hooksense.com/glossary/ip-allowlisting
- Mtls: https://hooksense.com/glossary/mtls
- Sse Vs Webhooks: https://hooksense.com/glossary/sse-vs-webhooks

## Migration guides

- From Webhook Site: https://hooksense.com/migrate/webhook-site
- From Hookdeck: https://hooksense.com/migrate/hookdeck

## Blog (6 posts)

- Hookdeck vs HookSense: Honest Comparison for Webhook Debugging: https://hooksense.com/blog/hookdeck-vs-hooksense
- Webhook Idempotency: Why It Matters and How to Implement It: https://hooksense.com/blog/webhook-idempotency-why-and-how
- Webhook Retry Strategies: Exponential Backoff Done Right: https://hooksense.com/blog/webhook-retry-strategies
- How to Test Webhooks in CI/CD Pipelines: https://hooksense.com/blog/test-webhooks-in-ci-cd
- Webhook vs Polling: When to Use Each: https://hooksense.com/blog/webhook-vs-polling
- Securing Webhooks: Top 10 Vulnerabilities to Avoid: https://hooksense.com/blog/securing-webhooks-top-10-vulnerabilities

## Programmatic Access

- **OpenAPI Spec**: https://hooksense.com/openapi.json (also /openapi.yaml)
- **MCP Server**: `npx -y @hooksense/mcp` — see https://hooksense.com/docs/mcp
- **API Tokens**: generate at https://hooksense.com/account, send as `Authorization: Bearer hsk_...`
- **CLI**: `npx hooksense` — see https://hooksense.com/docs/cli

## Key Links

- Website: https://hooksense.com
- Pricing: https://hooksense.com/pricing
- Documentation: https://hooksense.com/docs
- Getting Started: https://hooksense.com/docs/getting-started
- Blog: https://hooksense.com/blog
- Changelog: https://hooksense.com/changelog
- HMAC Calculator Tool: https://hooksense.com/tools/hmac-calculator
- Alternatives Hub: https://hooksense.com/alternatives
- Status: https://hooksense.com/about

## Technical Details

- Backend: Hono on Node.js, PostgreSQL, Redis (pub/sub, distributed locks, rate limiting)
- Frontend: React 19, Vite, Tailwind CSS v4, React Router v7
- Real-time delivery: WebSocket (ws) with Redis Pub/Sub for cross-instance fan-out
- Auth: JWT in httpOnly Secure SameSite=Lax cookies, GitHub OAuth via Arctic
- Payments: Polar
- Encryption: webhook bodies encrypted at rest with AES-256-GCM