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Add publish_at to create a scheduled post. 
curl -s \
  -H "Authorization: Bearer po_live_xxxxx_xxxxx" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: scheduled-launch-001" \
  -X POST https://postonce.to/api/public/v1/posts \
  -d '{
    "content": "Scheduled launch note",
    "publish_at": "2026-04-01T14:00:00.000Z",
    "targets": [
      { "account_id": "account-1" }
    ]
  }'

​
Supported follow-up actions

  • GET /v1/posts/{id} to inspect the aggregate scheduled post
  • PATCH /v1/posts/{id} to update it before it runs
  • POST /v1/posts/{id}/publish to run it now
  • POST /v1/posts/{id}/cancel or DELETE /v1/posts/{id} to cancel it