> ## Documentation Index > Fetch the complete documentation index at: https://docs.superx.so/llms.txt > Use this file to discover all available pages before exploring further. # Schedule or reschedule an article > Schedules the article for `scheduled_for` (UTC ISO-8601 with an explicit Z or offset, more than 2 minutes in the future; no maximum horizon). Scheduling a draft deducts post quota, refunded on unschedule or delete. Rescheduling an already scheduled article is a free time-only move. Supports `Idempotency-Key`. Main account only in v1. ## OpenAPI ````yaml /api-reference/openapi.yaml post /v1/articles/{id}/schedule openapi: 3.1.0 info: title: SuperX API version: 1.0.0 description: > The SuperX public API: your Twitter/X content, analytics, audience and scheduling data over REST. All endpoints require an API key (`Authorization: Bearer sxk_...`) except `GET /v1/docs`. Keys are created in the SuperX app under Account > API / MCP / CLI and are server-side secrets. Timestamps are UTC ISO-8601 in both directions; inputs must carry an explicit `Z` or numeric offset. Every authenticated response carries `X-RateLimit-Limit`, `X-RateLimit-Remaining` and `X-RateLimit-Reset` headers. contact: name: SuperX url: https://superx.so servers: - url: https://api.superx.so security: - apiKey: [] tags: - name: Identity - name: Content - name: Analytics - name: Inspiration - name: Audience - name: Contact Lists - name: Signals - name: Media - name: Scheduling - name: Tags - name: Context - name: Queue - name: Articles - name: Meta paths: /v1/articles/{id}/schedule: post: tags: - Articles summary: Schedule or reschedule an article description: > Schedules the article for `scheduled_for` (UTC ISO-8601 with an explicit Z or offset, more than 2 minutes in the future; no maximum horizon). Scheduling a draft deducts post quota, refunded on unschedule or delete. Rescheduling an already scheduled article is a free time-only move. Supports `Idempotency-Key`. Main account only in v1. operationId: scheduleArticle parameters: - name: id in: path required: true schema: type: string - $ref: '#/components/parameters/IdempotencyKey' requestBody: required: true content: application/json: schema: type: object required: - scheduled_for properties: scheduled_for: type: string format: date-time account_id: type: string example: scheduled_for: '2026-08-01T15:00:00Z' responses: '200': description: The scheduled article. headers: X-RateLimit-Limit: $ref: '#/components/headers/X-RateLimit-Limit' X-RateLimit-Remaining: $ref: '#/components/headers/X-RateLimit-Remaining' X-RateLimit-Reset: $ref: '#/components/headers/X-RateLimit-Reset' content: application/json: schema: type: object properties: data: $ref: '#/components/schemas/Article' '400': $ref: '#/components/responses/InvalidParameter' '401': $ref: '#/components/responses/Unauthorized' '402': description: Post quota exceeded for the current billing period. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' example: error: code: post_quota_exceeded message: Post quota exceeded for the current billing period. '403': $ref: '#/components/responses/WriteForbidden' '404': $ref: '#/components/responses/ArticleNotFound' '409': description: >- The article's status does not allow scheduling (already published or publishing), or the Idempotency-Key was reused with a different body. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' example: error: code: article_not_editable message: This article is already published '429': $ref: '#/components/responses/RateLimited' '502': $ref: '#/components/responses/UpstreamError' '503': $ref: '#/components/responses/UpstreamUnavailable' components: parameters: IdempotencyKey: name: Idempotency-Key in: header required: false description: >- Unique key (max 64 characters) for safe retries. Replays carry the "Idempotency-Replayed" response header set to "true". Keys are retained for 24 hours. schema: type: string maxLength: 64 headers: X-RateLimit-Limit: description: The limit of the rate window closest to exhaustion. schema: type: integer X-RateLimit-Remaining: description: Requests remaining in that window. schema: type: integer X-RateLimit-Reset: description: Unix timestamp (seconds) when that window resets. schema: type: integer schemas: Article: type: object properties: id: type: string title: type: string status: type: string enum: - draft - scheduled - publishing - published - failed content_markdown: type: string description: >- The article body as markdown. Present on single-article responses only, never in lists. cover: type: object nullable: true properties: url: type: string scheduled_for: type: string format: date-time nullable: true published_at: type: string format: date-time nullable: true x_post_id: type: string nullable: true description: The X post id once published. created_at: type: string format: date-time nullable: true description: Null in list responses. updated_at: type: string format: date-time nullable: true ErrorEnvelope: type: object required: - error properties: error: type: object required: - code - message properties: code: type: string description: Stable machine-readable error code. message: type: string retry_after: type: integer description: Seconds to wait before retrying (rate-limit errors only). LegacyErrorEnvelope: type: object required: - error description: | Legacy shape used ONLY by the shared subscription middleware: a plain string `error` field. Seen on `403` when the subscription has lapsed (string starts with "subscription_required:") and on `500` when subscription verification fails (string starts with "internal_error:"). properties: error: type: string example: >- subscription_required: The SuperX API requires an active subscription responses: InvalidParameter: description: A parameter is missing, malformed, or out of range. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' example: error: code: invalid_parameter message: since must be a UTC ISO-8601 timestamp Unauthorized: description: >- Missing/malformed Authorization header (`unauthorized`) or an unknown/revoked key (`invalid_api_key`). content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' example: error: code: invalid_api_key message: Unknown or revoked API key WriteForbidden: description: >- Read-only key (`insufficient_scope`), a linked or shared account (`writes_main_account_only`), or a lapsed subscription (legacy string envelope). content: application/json: schema: oneOf: - $ref: '#/components/schemas/ErrorEnvelope' - $ref: '#/components/schemas/LegacyErrorEnvelope' example: error: code: insufficient_scope message: >- This API key is read-only. Create a key with the write scope to use this endpoint. ArticleNotFound: description: No article with that id belongs to this account. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' example: error: code: not_found message: No article with that id belongs to this account. RateLimited: description: Rate limit exceeded (limits vary by plan). Honor Retry-After. headers: Retry-After: description: Seconds to wait before retrying. schema: type: integer X-RateLimit-Limit: $ref: '#/components/headers/X-RateLimit-Limit' X-RateLimit-Remaining: $ref: '#/components/headers/X-RateLimit-Remaining' X-RateLimit-Reset: $ref: '#/components/headers/X-RateLimit-Reset' content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' example: error: code: rate_limited message: >- Rate limit exceeded for the Pro plan (30 requests/min). Upgrade for higher limits. retry_after: 42 UpstreamError: description: A dependent SuperX service returned an unexpected response. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' example: error: code: upstream_error message: Failed to fetch scheduled posts. Try again shortly. UpstreamUnavailable: description: >- The scheduling service is temporarily unreachable. Safe to retry; reuse your Idempotency-Key on POST. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' example: error: code: upstream_unavailable message: >- The scheduling service is temporarily unavailable. Retry with the same Idempotency-Key. securitySchemes: apiKey: type: http scheme: bearer description: >- A SuperX API key ("sxk_..."), created in the SuperX app under Account > API / MCP / CLI. Keys are server-side secrets. ````