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

# Create keyword monitor

`POST /monitors/keywords`

Creates a keyword monitor. Keyword 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.

## Request body

- object
  - `query` string, required — X search query to monitor. Whitespace is normalized.
  - `eventTypes` EventType[], required — Array of event types to subscribe to.

## Response `201`

Keyword monitor created

- KeywordMonitor — Keyword monitor that tracks matching public X activity.
  - `id` string, required
  - `query` 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 for this keyword query monitor.

## Other responses

- `400` — Invalid input
- `401` — Unauthenticated
- `402` — Payment required. MPP reads include `WWW-Authenticate`. Authenticated reads include balances and checkout. Guest keys expose guest top-up only. A failed request never creates checkout. Confirm first.
- `409` — Keyword 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.

## Changes

- **2026-08-24** `5b381ffca02c` — 1 breaking, 1 info
  - the `oneOf[subschema #4]/allOf[subschema #2]/` response's property type/format changed from ``/`` to `object`/`` for status `402`
  - added 'propertyNames' constraint to the `oneOf[subschema #4]/allOf[subschema #2]/` response property for the status `402`
- **2026-08-19** `73cd0a1d989c` — 90 warning
  - added the new `closed` enum value to the `allOf[#/components/schemas/Error]/error/oneOf[subschema #1: LegacyErrorCode]/` response property for the response status `429`
  - added the new `closed` enum value to the `allOf[#/components/schemas/Error]/error/oneOf[subschema #2: StructuredError]/code` response property for the response status `429`
  - added the new `closed` enum value to the `error/oneOf[subschema #1: LegacyErrorCode]/` response property for the response status `400`
  - added the new `closed` enum value to the `error/oneOf[subschema #1: LegacyErrorCode]/` response property for the response status `401`
  - …86 more
- …earlier changes not shown

[Full history](https://skmtc.dev/xquik-dev/apis/xquik-api-3/changes/monitors/keywords/post.md)

---

[API](https://skmtc.dev/xquik-dev/apis/xquik-api-3.md) · [All operations](https://skmtc.dev/xquik-dev/apis/xquik-api-3/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/xquik-dev/xquik-api-3/revisions/3e010a962d32/schema)