SkySpark REST API (Project Haystack)
SkySpark is a native Project Haystack server. External applications integrate through the Haystack HTTP REST API, exposing operations such as about, read, hisRead, hisWrite, pointWrite, watchSub, watchPoll, watchUnsub, nav, eval, and commit over Zinc, JSON, Trio, and CSV. Endpoints follow the pattern /api/{proj}/{op} on each self-hosted SkySpark instance; authentication uses the Haystack SCRAM (SHA-256) handshake, after which a bearer authToken is presented via the Authorization header. There is no single public multi-tenant host — each customer runs its own SkySpark server.