Move from Postiz to PostWire in an afternoon

Postiz — their docs' example

curl -X POST "https://api.postiz.com/public/v1/posts" \
  -H "Authorization: your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "type": "schedule",
    "date": "2024-12-14T10:00:00.000Z",
    "shortLink": false,
    "tags": [],
    "posts": [{
      "integration": { "id": "your-instagram-id" },
      "value": [{
        "content": "Beautiful sunset #photography",
        "image": [{ "id": "img-123", "path": "https://uploads.postiz.com/photo.jpg" }]
      }],
      "settings": {
        "__type": "instagram",
        "post_type": "post"
      }
    }]
  }'

From docs.postiz.com, read Oct 9, 2026.

PostWire — REST (the converter's output)

curl -X POST https://postwire.io/api/schedule \
  -H "Authorization: Bearer $POSTWIRE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "platforms": [
    "instagram"
  ],
  "text": "Beautiful sunset #photography",
  "photo_url": "https://uploads.postiz.com/photo.jpg",
  "run_at": "2024-12-14T10:00:00.000Z"
}'

your key from the pasted command is not carried over: the output uses $POSTWIRE_API_KEY integration.id (a Postiz channel) → brand_id: create one PostWire brand per client (POST /api/brands) and send its id; with a single brand you can leave brand_id out the media is hosted by Postiz: pass a URL you host, or upload it to PostWire (POST /api/media/upload-url) run_at is in the past: PostWire refuses a schedule in the past — set a future time

PostWire — n8n node

PostWire node
  Resource:   Post
  Operation:  Schedule
  Networks:   instagram
  Content:    Same Text on Every Network
  Text:       Beautiful sunset #photography
  Media URL:  https://uploads.postiz.com/photo.jpg
  When:       At a Specific Time
  Publish At: 2024-12-14T10:00:00.000Z
  Options → Brand: the client's brand

PostWire — MCP (Claude, ChatGPT, any agent)

schedule_post({
  "platforms": [
    "instagram"
  ],
  "text": "Beautiful sunset #photography",
  "photo_url": "https://uploads.postiz.com/photo.jpg",
  "run_at": "2024-12-14T10:00:00.000Z"
})

# or ask your agent: "Schedule this on Instagram for 2024-12-14T10:00:00.000Z"