---
title: "Create monitor"
method: POST
path: "/monitors"
tags: ["Monitors"]
---

# Create monitor

`POST /monitors`

Creates an account monitor. Monitors are unlimited. Active monitors check every 1 second and cost 21 credits per hour. Events and webhook deliveries are included. Creation requires available credits for the first hourly charge and username lookup.

## Request body

- object
  - `username` string, required — X username (without @)
  - `eventTypes` EventType[], required — Array of event types to subscribe to.

## Response `201`

Monitor created

- object
  - `id` string, required
  - `username` string, required
  - `xUserId` string, required
  - `eventTypes` EventType[], required — Array of event types to subscribe to.
  - `isActive` boolean, required
  - `createdAt` string, date-time, required
  - `nextBillingAt` string, date-time, required — Next hourly credit charge time. New active monitors are due immediately.

## Other responses

- `400` — Invalid input
- `401` — Unauthenticated
- `402` — Payment required. MPP reads return a problem document and `WWW-Authenticate`. Authenticated reads return balances and checkout actions. Guest keys receive only the guest top-up action. Other endpoints may use legacy errors. A failed request never creates checkout. Require user confirmation before creating one.
- `404` — X user not found
- `409` — Monitor already exists
- `429` — Xquik tier rate limit exceeded. The response includes a `Retry-After` header with the number of seconds to wait before retrying.

---

[API](https://skmtc.net/xquik-dev/apis/xquik-api.md) · [All operations](https://skmtc.net/xquik-dev/apis/xquik-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/xquik-dev/xquik-api/revisions/a2886942ed0e/schema)