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postoni

WWebhook scheduler

Publish scheduled posts to any webhook

Not every destination has a Postoni channel, and some workflows need more than a post. The Webhook channel sends each scheduled post as JSON to a URL you choose, so Zapier, Make, n8n or your own service can take it from there: a CMS, a CRM, an SMS tool, a spreadsheet.

Schedule Webhook posts freeSee pricing
  • 7-day free trial
  • No credit card
  • Unlimited posts
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Bloom Studio

@bloomstudio · now

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Our autumn collection lands Friday. Twelve new glazes, all made by hand in our tiny studio.

Scheduled · Tue 11:30 AM
Illustration of a scheduled Webhook post in the Postoni composer

Everything you can publish to Webhook

Pick the format in the composer. Postoni handles the upload and the timing.

  • JSON post payloads
  • Media URLs
  • Signed requests

Built around how Webhook actually works

  • Signed and verifiable

    Add a secret and every request carries an X-Postoni-Signature header, sha256= followed by the HMAC-SHA256 of the body, so your endpoint can reject anything that didn't come from Postoni.

  • Works with no-code tools

    Paste a Zapier Catch Hook, a Make custom webhook or an n8n Webhook node URL and build the rest of the flow there.

  • Same calendar, any destination

    The post is scheduled, approved and tracked like any other channel, even if it ends up somewhere Postoni has never heard of.

How to schedule a Webhook post

Four steps, about two minutes the first time. After that it's write, tweak, schedule.

  1. 1

    Create a receiving URL

    In Zapier, Make or n8n, start a flow with a webhook trigger and copy its URL, or use an HTTPS endpoint of your own.

  2. 2

    Connect in Postoni

    Add the Webhook channel, paste the URL and, optionally, a signing secret.

  3. 3

    Write the post

    Write it like any other post and attach media. Media is sent as public URLs.

  4. 4

    Schedule it

    At the scheduled time Postoni sends the JSON, and your flow does the rest.

Webhook scheduling FAQ

Free Webhook tools

Character counter for every network

Paste one draft and see which networks it fits.

What does the request look like?

An HTTPS POST with a JSON body containing the post text, media URLs and post details. With a secret set, the X-Postoni-Signature header holds sha256= plus the hex HMAC-SHA256 of the raw body.

How do I verify the signature?

Compute HMAC-SHA256 of the raw request body with your secret, prefix it with sha256= and compare it to the header using a constant-time comparison.

What counts as a successful post?

Your endpoint should answer with a 2xx status. Any other response, or a timeout, marks the post as failed so you can retry it.

Is the secret required?

No, but it's strongly recommended for any endpoint that does something visible, so nobody can trigger it by guessing the URL.

Pairs well with Webhook

Most people post the same idea to a few networks. These are the ones that usually go with Webhook.

See all channels

Ready to put Webhook on autopilot?

Connect Webhook, write your first post and schedule it in two minutes. Free for 7 days, no card.

Start free for 7 days
  • Unlimited posts on every plan
  • Cancel anytime
  • Open-source core