Webhooks build vs. buy

Webhooks aren't a feature you ship once. They're infrastructure your customers rely on every day, and the failure modes are visible to them: missed events, out-of-order deliveries, 5xx errors they can't debug. Buying means starting from a system that has been hardened across billions of deliveries and a wide range of customer workloads.

Svix offers a 99.999% uptime SLA, retries with exponential backoff and a dead-letter path, signing and replay protection, an embeddable consumer portal, OpenTelemetry observability, payload transformations, FIFO ordering, and SOC 2 Type II, HIPAA, PCI-DSS, GDPR, and CCPA compliance, all out of the box and in days rather than months. For teams that need to run the system inside their own environment, Svix offers a fully supported enterprise on-prem deployment with the full Svix functionality, alongside the MIT-licensed open source server.

The headline number is 3-5 engineers for 6-12 months, plus 1-2 on ongoing maintenance. Underneath that sit on-call rotations, customer support load when integrations break, infrastructure that has to scale with traffic spikes, and senior engineers pulled off the core product.

The maintenance burden compounds. Once webhooks are live, customers ask for filtering, transformations, replays, FIFO ordering, and observability. Each is a multi-week project, and the backlog grows faster than the team can drain it.

Buy if webhooks are a means to an end rather than your core product, if you need to be in production in days, if you operate in a regulated environment (HIPAA, PCI-DSS, SOC 2) where the compliance work alone would dwarf the build, or if you expect meaningful volume and can't afford the on-call burden of running queues and delivery infrastructure yourself.

Building in-house is defensible for a narrow set of cases: hobbyist and research workloads, very low volume where reliability isn't important, or unusual data-residency or air-gapped deployments. Even there, the Svix open source server (MIT-licensed) or the fully supported Svix enterprise on-prem deployment, which ships with the full Svix functionality, is a better starting point than a from-scratch build.

For almost every production workload, buying is faster, cheaper, and more reliable than building. The build path looks attractive at the start because the first version is small; the cost shows up later as on-call pages, customer escalations, and a backlog that never shrinks. If webhooks aren't your core product, let someone else run the infrastructure and put your engineers back on the work that differentiates you.

You can start on the free tier with no credit card required, or talk to our team about your specific requirements.

Most in-house webhook systems start as a queue. Your app publishes an event to SQS or RabbitMQ, a pool of workers pulls it off and POSTs it to the customer's URL, and failed requests go back on the queue. That's a sound base: the queue gives you durable storage, at-least-once delivery to your workers, and a dead-letter queue for messages that keep failing.

What the queue doesn't know about is the endpoint on the other end. A shared queue has no per-endpoint isolation, so one customer's slow or dead endpoint ties up workers and delays everyone else. Retry timing is yours to build: SQS message delays top out at 15 minutes, and RabbitMQ needs a plugin or TTL and dead-letter exchanges to delay a retry, so a backoff schedule that spans hours means extra queues or a separate scheduler. On top of that you still need payload signing, SSRF protection for customer-supplied URLs, a log of every attempt, replay, alerts and auto-disabling for endpoints that stay down, and a portal where customers manage endpoints and debug their own deliveries.

Moving to Svix replaces the workers and the retry logic, not your event producers. Where your code publishes to the queue today, it makes one API call to Svix instead, and Svix runs a queue per endpoint, retries with exponential backoff for about a day, signs every payload, and gives customers the App Portal. You can keep SQS or RabbitMQ for internal events; only delivery to customer endpoints moves.

A typical migration creates a Svix application per customer, with your own customer ID as its UID, adds the endpoint URLs customers already registered, and moves customers over in stages while the old system keeps running. Unless you already sign with Standard Webhooks, customers will need to update their verification code; on Enterprise, Svix can match your existing signature scheme instead. Guesty moved off its homegrown system in stages: the integration took 2-3 weeks, embedding the App Portal took 1-2 days, and production customers moved over gradually after that.