League Platform API
The League platform API, served from the Kong-fronted gateway at api.league.com. Unauthenticated requests return an RFC-shaped JSON:API error document (content-type application/vnd.api+json) and carry x-ratelimit-limit-360 / x-ratelimit-remaining-360 response headers, confirming a live, rate-limited production gateway. Access is provisioned per customer as API Keys under the League Developer Program Terms; no public API reference or machine-readable contract is published.