Posthook

Development

Visit website

Schedule webhooks for future delivery with retries and delivery tracking.

About Posthook

Posthook is an API for scheduling webhooks to be delivered at a specific future time. A developer sets a target time and a payload, and Posthook delivers an HTTP request to a specified endpoint at that time, with delivery tracked through a dashboard that shows payload contents and delivery status.

The service is built around two use cases: one-time callbacks for delayed job processing, notifications, and expiration checks, and sequences that chain multiple hooks together into time-based workflows with parallel or series steps and dependencies. Listed use cases include reminder emails, trial expiration checks, abandoned cart recovery, scheduled report delivery, and polling third-party status-check APIs. It targets developers who need time-based, scheduled webhook delivery rather than high-volume real-time job processing; the documentation distinguishes it from job queues like SQS, BullMQ, or Celery.

Platform features include at-least-once delivery with configurable retry backoff, cryptographic signature verification on requests, local development support via a CLI without tunneling tools, a real-time dashboard for inspecting payloads and debugging failures, and config-as-code definition of sequences and settings in TOML. Client libraries are available for TypeScript/Node, Python, and Go, alongside a REST API and curl-based access.

Key features

Schedule one-time HTTP callbacks (webhooks) for a specific future time
Chain hooks into recurring, multi-step workflows (Sequences) with parallel or series steps
At-least-once delivery with automatic retries and configurable backoff
Cryptographic signature verification on every delivered request
Local development via CLI to receive hooks on localhost without tunneling tools
Real-time dashboard to inspect payloads and track delivery status

Frequently asked questions

What is Posthook for?

Posthook is an API for scheduling webhooks: you set a time and payload, and it delivers the HTTP request to your endpoint at that time. It is meant for time-based workflows like reminders, trial expirations, and scheduled reports, not high-volume real-time job processing.

Which languages have client libraries?

Posthook provides client libraries for TypeScript/Node, Python, and Go, plus a plain curl/HTTP API.

How do I test webhooks locally?

Posthook's CLI lets you receive hooks on localhost for local development without needing tunneling tools.

How are webhook deliveries secured and verified?

Every request carries a cryptographic signature so recipients can verify authenticity, and deliveries use at-least-once semantics with automatic retries and configurable backoff.

Should I use Posthook instead of a job queue like SQS or BullMQ?

No — Posthook is not a job queue; it's built for scheduled, time-based webhooks rather than high-volume fire-and-forget background jobs, for which dedicated queues like SQS, BullMQ, or Celery are recommended.