---
title: "Create a league season"
method: POST
path: "/leagues/{identifier}/seasons/create"
tags: ["League: Seasons"]
---

# Create a league season

`POST /leagues/{identifier}/seasons/create`

Creates an upcoming season for a league game. Requires a personal or developer API key whose owner is currently a league ADMIN of the league in the path, with the league seasons capability enabled on the key. League API access is gated at api_pro on the league owner's plan. Supply an optional `Idempotency-Key` request header to make retries safe: an identical key and body replays the original season id, while the same key with a different body returns 409 error_idempotency_key_conflict.

## Path parameters

- `identifier` string, required — League slug.

## Request body

- CreateSeasonRequestBody — League season creation payload.
  - `gameId` string, required — Game ID the season belongs to.
  - `name` string, required — Season name.
  - `startDate` number, required — Season start timestamp in milliseconds.
  - `endDate` number, required — Season end timestamp in milliseconds.

## Response `200`

The season was created.

- CreateSeasonResponse
  - `success` true, required
  - `seasonId` string, required
  - `timestamp` string, required

## Other responses

- `400` — Bad request (invalid body, cursor, limit, or date).
- `401` — Missing or invalid API key.
- `403` — API key lacks the required permission.
- `404` — Resource not found.
- `409` — Conflict.
- `429` — Rate limited.
- `500` — Internal server error.

---

[API](https://skmtc.net/teambattles/apis/teambattles-api.md) · [All operations](https://skmtc.net/teambattles/apis/teambattles-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/teambattles/teambattles-api/versions/2ffe8fb53b7d/schema)