Posthook

A webhook scheduling API that lets developers schedule HTTP callbacks for reminders, follow-ups, notifications, and expirations. It solves the problem of building and maintaining custom scheduling infrastructure. The service targets developers and engineering teams at companies of all sizes, from startups to enterprises. It is positioned as a simple, reliable alternative to building in-house scheduling systems or using broader workflow platforms, offering exact-time delivery, observability, and failure recovery.

Key features

• Schedule webhooks with custom payloads
• Signed payloads for verification
• Ack/nack for extended processing
• CLI for local testing
• Observability with delivery logs
• Failure alerting with baselines
• Retention of delivery data
• Multi-zone sync replication
• 99.98% uptime SLA