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Glossary

What is a webhook?

A webhook is an automated HTTP callback: instead of your app repeatedly polling a service to check for updates, the service sends your app an HTTP POST request the moment something happens — for example, the instant a scheduled post actually publishes — with a signature you can verify to confirm it really came from that service.

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What is a webhook used for?#

SkedCast signs every webhook with an X-SkedCast-Signature header (t=<timestamp>,v1=<HMAC-SHA256> over the timestamp and raw body) and also supports the vendor-neutral Standard Webhooks header set, so either verification approach works.

Webhooks are typically delivered within seconds of the triggering event, and a well-built receiver should respond quickly, before doing any slow processing, so the sending service doesn't treat the delivery as failed and retry it unnecessarily.

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FAQ

Is a webhook the only way to know when a post publishes?
No — you can also poll the REST API for a post's status, or connect an MCP client and ask an AI agent to check. A webhook is just the option that avoids polling entirely.

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