1Post sends signed webhooks on every plan and lets you send a test message.
A webhook is also a destination: a post can be sent as signed JSON to your own address.
Glossary
Webhook: what it means
A webhook is a message one system sends to a web address you choose when something happens, such as a post being published. The message carries the details as JSON. Signing the message lets your system confirm it came from the sender and was not changed on the way.
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Free tools
Count characters the way each network does, split threads and preview posts. No account needed.
Open the toolsFor builders
API and MCP
Post to every network from your own code or assistant with one key, signed webhooks and idempotent requests.
See the APIQuestions
How do I know a webhook is real?
Check its signature against your secret. 1Post signs every message.
Related
From one post to every feed
Plan the week in one sitting, keep your team in the loop, and let 1Post publish on time while you get on with the rest of your day.