Schedule Hook

curl --request POST \
  --url https://api.posthook.io/v1/hooks \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "path": "/webhooks/reminder",
  "data": {
    "user_id": "123"
  },
  "postAt": "2026-03-14T12:00:00Z",
  "postAtLocal": "2026-03-15T13:00:00",
  "timezone": "America/New_York",
  "postIn": "1h30m"
}
'

import requests

url = "https://api.posthook.io/v1/hooks"

payload = {
    "path": "/webhooks/reminder",
    "data": { "user_id": "123" },
    "postAt": "2026-03-14T12:00:00Z",
    "postAtLocal": "2026-03-15T13:00:00",
    "timezone": "America/New_York",
    "postIn": "1h30m"
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    path: '/webhooks/reminder',
    data: {user_id: '123'},
    postAt: '2026-03-14T12:00:00Z',
    postAtLocal: '2026-03-15T13:00:00',
    timezone: 'America/New_York',
    postIn: '1h30m'
  })
};

fetch('https://api.posthook.io/v1/hooks', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.posthook.io/v1/hooks",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'path' => '/webhooks/reminder',
    'data' => [
        'user_id' => '123'
    ],
    'postAt' => '2026-03-14T12:00:00Z',
    'postAtLocal' => '2026-03-15T13:00:00',
    'timezone' => 'America/New_York',
    'postIn' => '1h30m'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.posthook.io/v1/hooks"

	payload := strings.NewReader("{\n  \"path\": \"/webhooks/reminder\",\n  \"data\": {\n    \"user_id\": \"123\"\n  },\n  \"postAt\": \"2026-03-14T12:00:00Z\",\n  \"postAtLocal\": \"2026-03-15T13:00:00\",\n  \"timezone\": \"America/New_York\",\n  \"postIn\": \"1h30m\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-Key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.posthook.io/v1/hooks")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"path\": \"/webhooks/reminder\",\n  \"data\": {\n    \"user_id\": \"123\"\n  },\n  \"postAt\": \"2026-03-14T12:00:00Z\",\n  \"postAtLocal\": \"2026-03-15T13:00:00\",\n  \"timezone\": \"America/New_York\",\n  \"postIn\": \"1h30m\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.posthook.io/v1/hooks")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"path\": \"/webhooks/reminder\",\n  \"data\": {\n    \"user_id\": \"123\"\n  },\n  \"postAt\": \"2026-03-14T12:00:00Z\",\n  \"postAtLocal\": \"2026-03-15T13:00:00\",\n  \"timezone\": \"America/New_York\",\n  \"postIn\": \"1h30m\"\n}"

response = http.request(request)
puts response.read_body

{
  "data": {
    "id": "<string>",
    "path": "<string>",
    "domain": "<string>",
    "data": {},
    "postAt": "2023-11-07T05:31:56Z",
    "status": "pending",
    "postDurationSeconds": 123,
    "createdAt": "2023-11-07T05:31:56Z",
    "updatedAt": "2023-11-07T05:31:56Z",
    "attempts": 123,
    "failureError": "<string>",
    "tryAt": "2023-11-07T05:31:56Z",
    "wasNotified": true,
    "sequenceData": {
      "sequenceID": "<string>",
      "stepName": "<string>",
      "sequenceLastRunAt": "2023-11-07T05:31:56Z"
    }
  }
}

POST

hooks

Schedule Hook

curl --request POST \
  --url https://api.posthook.io/v1/hooks \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "path": "/webhooks/reminder",
  "data": {
    "user_id": "123"
  },
  "postAt": "2026-03-14T12:00:00Z",
  "postAtLocal": "2026-03-15T13:00:00",
  "timezone": "America/New_York",
  "postIn": "1h30m"
}
'

import requests

url = "https://api.posthook.io/v1/hooks"

payload = {
    "path": "/webhooks/reminder",
    "data": { "user_id": "123" },
    "postAt": "2026-03-14T12:00:00Z",
    "postAtLocal": "2026-03-15T13:00:00",
    "timezone": "America/New_York",
    "postIn": "1h30m"
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    path: '/webhooks/reminder',
    data: {user_id: '123'},
    postAt: '2026-03-14T12:00:00Z',
    postAtLocal: '2026-03-15T13:00:00',
    timezone: 'America/New_York',
    postIn: '1h30m'
  })
};

fetch('https://api.posthook.io/v1/hooks', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.posthook.io/v1/hooks",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'path' => '/webhooks/reminder',
    'data' => [
        'user_id' => '123'
    ],
    'postAt' => '2026-03-14T12:00:00Z',
    'postAtLocal' => '2026-03-15T13:00:00',
    'timezone' => 'America/New_York',
    'postIn' => '1h30m'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.posthook.io/v1/hooks"

	payload := strings.NewReader("{\n  \"path\": \"/webhooks/reminder\",\n  \"data\": {\n    \"user_id\": \"123\"\n  },\n  \"postAt\": \"2026-03-14T12:00:00Z\",\n  \"postAtLocal\": \"2026-03-15T13:00:00\",\n  \"timezone\": \"America/New_York\",\n  \"postIn\": \"1h30m\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-Key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.posthook.io/v1/hooks")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"path\": \"/webhooks/reminder\",\n  \"data\": {\n    \"user_id\": \"123\"\n  },\n  \"postAt\": \"2026-03-14T12:00:00Z\",\n  \"postAtLocal\": \"2026-03-15T13:00:00\",\n  \"timezone\": \"America/New_York\",\n  \"postIn\": \"1h30m\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.posthook.io/v1/hooks")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"path\": \"/webhooks/reminder\",\n  \"data\": {\n    \"user_id\": \"123\"\n  },\n  \"postAt\": \"2026-03-14T12:00:00Z\",\n  \"postAtLocal\": \"2026-03-15T13:00:00\",\n  \"timezone\": \"America/New_York\",\n  \"postIn\": \"1h30m\"\n}"

response = http.request(request)
puts response.read_body

{
  "data": {
    "id": "<string>",
    "path": "<string>",
    "domain": "<string>",
    "data": {},
    "postAt": "2023-11-07T05:31:56Z",
    "status": "pending",
    "postDurationSeconds": 123,
    "createdAt": "2023-11-07T05:31:56Z",
    "updatedAt": "2023-11-07T05:31:56Z",
    "attempts": 123,
    "failureError": "<string>",
    "tryAt": "2023-11-07T05:31:56Z",
    "wasNotified": true,
    "sequenceData": {
      "sequenceID": "<string>",
      "stepName": "<string>",
      "sequenceLastRunAt": "2023-11-07T05:31:56Z"
    }
  }
}

Schedule a new webhook to be sent at a specific time in the future (or immediately).

Pro Tip: To verify immediate delivery, use a timestamp in the past (e.g. yesterday).

URL Resolution

When you schedule a hook, you provide a path (e.g. /webhooks/remind). Posthook constructs the full destination URL by combining your Project Domain with this path.

Destination URL = Project Domain + path

For example, if your Project Domain is api.myapp.com and you schedule a hook with path /webhooks/payment, we will POST to https://api.myapp.com/webhooks/payment (Posthook enforces HTTPS).

Usage Patterns

User Engagement: Schedule event reminders and abandoned cart recovery emails.
Auto-Expiry (TTL): Schedule the deletion of temporary resources (e.g. shared links) at the moment of creation.
Recursive Polling: Periodically check a long-running job (e.g. video encoding) until it completes.
Debouncing: Prevent duplicate processing by verifying event freshness.

Authorizations

X-API-Key

string

header

required

Body

application/json

path

string

required

The endpoint path for delivery.

Example:

"/webhooks/reminder"

data

object

required

Arbitrary JSON payload delivered with the hook.

Example:

{ "user_id": "123" }

postAt

string<date-time>

RFC 3339 timestamp in UTC for delivery. Mutually exclusive with postAtLocal + timezone. Timestamps in the past are delivered immediately.

Example:

"2026-03-14T12:00:00Z"

postAtLocal

string

ISO 8601 local datetime without offset, in YYYY-MM-DDTHH:MM:SS format (e.g. 2026-03-15T13:00:00). Must be used with timezone. Mutually exclusive with postAt.

Example:

"2026-03-15T13:00:00"

timezone

string

IANA Time Zone identifier (e.g. America/New_York). Required when using postAtLocal. Forbidden with postAt and postIn.

Example:

"America/New_York"

postIn

string

Relative delay from now as a duration string (e.g., 5m, 2h, 1d12h). Units: d (days), h (hours), m (minutes), s (seconds). Min 1s, max 365d. Mutually exclusive with postAt and postAtLocal. Cannot be used with timezone.

Example:

"1h30m"

retryOverride

object

Per-hook retry configuration. Overrides the project's default retry settings for this hook.

Show child attributes

Response

201 - application/json

Hook scheduled

data

object

Show child attributes

​URL Resolution

​Usage Patterns

Authorizations

Body

Response

URL Resolution

Usage Patterns