PostSyncer Social Media Assistant

Autonomously manage social media through PostSyncer using the REST API.

Setup

1. Create a PostSyncer account at app.postsyncer.com
2. Connect social profiles (Instagram, TikTok, YouTube, X, LinkedIn, etc.)
3. Go to Settings → API Integrations and create a personal access token with abilities: workspaces, accounts, posts, and (if you use them) labels, campaigns
4. Add to .env: POSTSYNCER_API_TOKEN=your_token

PostSyncer MCP (optional)

PostSyncer MCP uses the same Bearer token as REST. Typical tools: list-workspaces, list-accounts, post CRUD (including content[].cover_image for Reels/video covers), get-post-by-url, get-post-by-platform-post-id, analyze-twitter-post (fetch any public X/Twitter URL, load replies, answer a question with AI), list-media, get-media, upload-media-from-url, upload-media-file (base64, same rules as REST file upload), delete-media, list-folders, create-folder, get-folder, update-folder, delete-folder, comments, labels, campaigns, analytics.

Raw multipart (POST /api/v1/media/upload/file) is usually easier from curl/scripts; MCP uses upload-media-file with base64 for clients that only send JSON tool arguments.

How to Make API Calls

All requests go to https://postsyncer.com/api/v1 with the header:

Authorization: Bearer $POSTSYNCER_API_TOKEN
Content-Type: application/json

Use web_fetch, curl, or any HTTP tool available. Always read $POSTSYNCER_API_TOKEN from the environment.

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API Reference

Discovery (Call First)

List Workspaces — GET /api/v1/workspaces

curl "https://postsyncer.com/api/v1/workspaces" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

Returns workspaces with id, name, slug, timezone.

List Accounts — GET /api/v1/accounts

curl "https://postsyncer.com/api/v1/accounts" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

Returns accounts with id, platform, username, workspace_id.

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Media library

Requires the posts ability. Responses include id, workspace_id, folder_id, and asset metadata.

List Media — GET /api/v1/media

curl -G "https://postsyncer.com/api/v1/media" \
  --data-urlencode "workspace_id=12" \
  --data-urlencode "page=1" \
  --data-urlencode "per_page=50" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

Query params: workspace_id, folder_id, root_only (true/false), page, per_page (max 100).

Get Media — GET /api/v1/media/{media_id}

curl "https://postsyncer.com/api/v1/media/999" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

Import from URLs — POST /api/v1/media/upload/url

curl -X POST "https://postsyncer.com/api/v1/media/upload/url" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"workspace_id": 12, "urls": ["https://example.com/photo.jpg"], "folder_id": null}'

Upload file (multipart) — POST /api/v1/media/upload/file

Use multipart/form-data with fields such as workspace_id, file (and optional chunk/chunk metadata if your client uses chunked upload). Not JSON.

Delete Media — DELETE /api/v1/media/{media_id} (confirm first)

curl -X DELETE "https://postsyncer.com/api/v1/media/999" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

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Media folders

Requires the posts ability.

List Folders — GET /api/v1/folders

curl -G "https://postsyncer.com/api/v1/folders" \
  --data-urlencode "workspace_id=12" \
  --data-urlencode "root=1" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

Query params: workspace_id, parent_id, root (top-level only).

Create Folder — POST /api/v1/folders

curl -X POST "https://postsyncer.com/api/v1/folders" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"workspace_id": 12, "name": "Campaign assets", "color": "#3b82f6", "parent_id": null}'

Get Folder — GET /api/v1/folders/{id}

Update Folder — PUT /api/v1/folders/{id}

curl -X PUT "https://postsyncer.com/api/v1/folders/5" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"name": "Renamed folder"}'

Delete Folder — DELETE /api/v1/folders/{id} (confirm first)

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Posts

List Posts — GET /api/v1/posts

curl "https://postsyncer.com/api/v1/posts?page=1&per_page=20&include_comments=false" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

Query params: page, per_page (max 100), include_comments (true/false).

Get Post — GET /api/v1/posts/{id}

curl "https://postsyncer.com/api/v1/posts/123" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

Create Post — POST /api/v1/posts

curl -X POST "https://postsyncer.com/api/v1/posts" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "workspace_id": 12,
    "schedule_type": "schedule",
    "content": [{
      "text": "Caption #hashtags",
      "media": [42],
      "cover_image": {"thumbnail": 43}
    }],
    "accounts": [{"id": 136}, {"id": 95, "settings": {"post_type": "REELS"}}],
    "schedule_for": {"date": "2026-03-26", "time": "14:30", "timezone": "America/New_York"},
    "labels": [5],
    "repeatable": false
  }'

• schedule_type: publish_now | schedule | draft
• schedule_for: Optional scheduling object used when schedule_type is schedule. Provide {"date": "YYYY-MM-DD", "time": "HH:MM", "timezone": "..."} to schedule for a specific date/time, or omit/leave empty to auto-schedule to the next available time slot
• content: Array of thread items. Each needs text and/or media: an array of library media IDs (integers) and/or HTTPS URL strings (import or list media first when you want stable IDs). Optional cover_image on video posts (see below).
• accounts: Array of {id, settings?}. Platform-specific options go in settings

Video cover images (content[].cover_image)

For video posts, set cover_image on the first content item. Only that thread's cover is used when publishing.

Field	Type	Description
thumbnail	integer or URL	Custom cover image upload — workspace media library id (image only) or public HTTPS URL.
video_cover_timestamp_ms	integer	Frame selection from the attached video — timestamp in milliseconds (e.g. 2500 = 2.5s).

Platform requirements

Platform	Cover method	API field
TikTok	Frame selection from video only	video_cover_timestamp_ms
YouTube	Custom thumbnail upload only	thumbnail
Instagram (Reels)	Custom thumbnail upload only	thumbnail
Facebook (Reels / video)	Custom thumbnail upload only	thumbnail

Do not mix methods across platforms in one request without understanding the table above. TikTok does not accept custom thumbnail uploads via the API — use video_cover_timestamp_ms. YouTube, Instagram, and Facebook require a custom image in thumbnail — frame timestamps are not used.

Example — Instagram / Facebook / YouTube (custom thumbnail):

"content": [{
  "text": "New reel!",
  "media": [1842],
  "cover_image": {"thumbnail": 1843}
}],
"accounts": [{"id": 136, "settings": {"post_type": "REELS"}}]

Example — TikTok (frame from video):

"content": [{
  "text": "New TikTok!",
  "media": [1842],
  "cover_image": {"video_cover_timestamp_ms": 2500}
}]

Typical workflow for YouTube / Instagram / Facebook: upload the video → upload the cover image → create the post with both in content[0]. For TikTok: upload the video → set video_cover_timestamp_ms to the desired frame.

Update Post — PUT /api/v1/posts/{id}

curl -X PUT "https://postsyncer.com/api/v1/posts/123" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"content": [{"text": "Updated caption", "media": [42], "cover_image": {"thumbnail": 43}}], "schedule_for": {"date": "2026-03-27", "time": "10:00"}}'

Only posts that have not been published yet can be updated. Supports the same content[].cover_image shape as create.

Delete Post — DELETE /api/v1/posts/{id} (confirm with user first)

curl -X DELETE "https://postsyncer.com/api/v1/posts/123" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

Analyze X/Twitter Post (AI) — POST /api/v1/posts/analyze-twitter

Fetch any public X/Twitter status URL, load all replies, and answer a question with Claude Sonnet 4.6. The post does not need to exist in PostSyncer.

curl -X POST "https://postsyncer.com/api/v1/posts/analyze-twitter" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"url": "https://x.com/user/status/1234567890", "question": "What is the overall sentiment in the replies?"}'

MCP equivalent: analyze-twitter-post with the same url and question fields.

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Comments

List Comments — GET /api/v1/comments

curl -G "https://postsyncer.com/api/v1/comments" \
  --data-urlencode "post_id=123" \
  --data-urlencode "per_page=20" \
  --data-urlencode "include_replies=true" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

Query params: post_id (required), per_page, page, include_replies, platform.

Get Comment — GET /api/v1/comments/{id}

curl "https://postsyncer.com/api/v1/comments/456" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

Create Comment / Reply — POST /api/v1/comments

curl -X POST "https://postsyncer.com/api/v1/comments" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"post_id": 123, "content": "Reply text", "parent_comment_id": null, "media": [42]}'

Optional media: array of integer library IDs and/or HTTPS URLs (same shape as post content[].media; do not use a deprecated media_urls field).

Update Comment — PUT /api/v1/comments/{id}

curl -X PUT "https://postsyncer.com/api/v1/comments/456" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"content": "Updated reply text"}'

Hide Comment — POST /api/v1/comments/{id}/hide

curl -X POST "https://postsyncer.com/api/v1/comments/456/hide" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

Delete Comment — DELETE /api/v1/comments/{id} (confirm first)

curl -X DELETE "https://postsyncer.com/api/v1/comments/456" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

Sync Comments from Platforms — POST /api/v1/comments/sync

curl -X POST "https://postsyncer.com/api/v1/comments/sync" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"post_id": 123}'

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Labels

List Labels — GET /api/v1/labels

curl "https://postsyncer.com/api/v1/labels" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

Get Label — GET /api/v1/labels/{id}

Create Label — POST /api/v1/labels

curl -X POST "https://postsyncer.com/api/v1/labels" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"name": "Campaign 2026", "color": "#3b82f6", "workspace_id": 12}'

Update Label — PUT /api/v1/labels/{id}

Delete Label — DELETE /api/v1/labels/{id} (confirm first)

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Analytics

All analytics endpoints require the posts API ability.

All Workspaces — GET /api/v1/analytics

curl "https://postsyncer.com/api/v1/analytics" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

By Workspace — GET /api/v1/analytics/workspaces/{workspace_id}

curl "https://postsyncer.com/api/v1/analytics/workspaces/12" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

By Post — GET /api/v1/analytics/posts/{post_id}

curl "https://postsyncer.com/api/v1/analytics/posts/123" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

By Account — GET /api/v1/analytics/accounts/{account_id}

curl "https://postsyncer.com/api/v1/analytics/accounts/136" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

Sync Post Analytics — POST /api/v1/analytics/posts/{post_id}/sync

curl -X POST "https://postsyncer.com/api/v1/analytics/posts/123/sync" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

Queues background jobs to refresh metrics. Does not return metrics directly — call GET after sync.

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Account Management

Delete Account — DELETE /api/v1/accounts/{id} (destructive, confirm first)

curl -X DELETE "https://postsyncer.com/api/v1/accounts/136" \
  -H "Authorization: Bearer $POSTSYNCER_API_TOKEN"

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Platform-Specific Settings

Pass per-platform options in accounts[].settings when creating/updating posts:

Pinterest: {"board_id": 123456}

X/Twitter:

{"reply_settings": "everyone", "for_super_followers_only": false, "quote_tweet_id": null, "reply": {"in_reply_to_tweet_id": null}, "community_id": null, "share_with_followers": true}

TikTok:

{"privacy_level": "PUBLIC_TO_EVERYONE", "disable_comment": false, "disable_duet": false, "disable_stitch": false, "post_mode": "DIRECT_POST"}

Cover: video_cover_timestamp_ms only — pick a frame from the video. Custom thumbnail upload is not supported on TikTok.

Instagram: {"post_type": "REELS"} — options: REELS, STORIES, POST. Cover: thumbnail only — upload a custom cover image.

Facebook: Cover for Reels/video: thumbnail only — upload a custom cover image (use post_type: "REELS" when posting as a Reel).

YouTube:

{"video_type": "video", "title": "My Video", "privacyStatus": "public", "notifySubscribers": true}

Cover: thumbnail only — upload a custom video thumbnail.

LinkedIn: {"visibility": "PUBLIC"} — options: PUBLIC, CONNECTIONS, LOGGED_IN

Bluesky: {"website_card": {"uri": "https://...", "title": "...", "description": "..."}}

Telegram: {"disable_notification": false, "protect_content": false}

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Common Workflows

Schedule a Post to Multiple Platforms

1. GET /api/v1/workspaces → get workspace_id
2. GET /api/v1/accounts → get ids for target platforms
3. Optionally POST /api/v1/media/upload/url (or MCP upload-media-from-url) → use returned ids in content[].media
4. POST /api/v1/posts with schedule_type: "schedule" and schedule_for

Publish a Reel / Video with a Cover (Instagram, Facebook, YouTube)

1. Upload the video → POST /api/v1/media/upload/file or POST /api/v1/media/upload/url → note video id
2. Upload a cover image → note cover id
3. POST /api/v1/posts with content[0].media = video id, content[0].cover_image.thumbnail = cover id, and platform settings (e.g. post_type: "REELS" for Instagram/Facebook)

Publish a TikTok with a Cover Frame

1. Upload the video → note video id
2. POST /api/v1/posts with content[0].media = video id and content[0].cover_image.video_cover_timestamp_ms = frame time in milliseconds (TikTok does not support custom thumbnail upload)

Reply to Comments

1. GET /api/v1/posts → find post id
2. POST /api/v1/comments/sync with post_id
3. GET /api/v1/comments?post_id=123&include_replies=true
4. POST /api/v1/comments with post_id and optional parent_comment_id

Check Performance

1. GET /api/v1/analytics/posts/{id} for a specific post
2. If stale: POST /api/v1/analytics/posts/{id}/sync, then re-fetch

Analyze a Public X/Twitter Thread

1. POST /api/v1/posts/analyze-twitter (or MCP analyze-twitter-post) with a public status URL and a question
2. Use the returned answer for sentiment, objections, feature requests, or other reply themes

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Best Practices

• Video covers: Match the cover method to the platform — TikTok: video_cover_timestamp_ms only; YouTube / Instagram / Facebook: thumbnail only (upload a cover image first)
• Always start with GET /workspaces and GET /accounts to discover IDs; use GET /folders and GET /media when organizing or attaching library assets
• New automations: Use schedule_type: "draft" or confirm before publish_now
• Destructive actions: State what will happen, confirm before delete operations
• Multi-network: One post can target multiple accounts; check per-platform status in the response
• Rate limits: 60 requests/minute — don't call sync endpoints repeatedly
• Hashtags: Keep relevant and limited (3–5 per post)

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Error Handling

Status	Meaning
401	Token missing or invalid
403	Token lacks required ability (e.g. posts)
404	Resource not found or no access
422	Validation error — check required fields and formats
429	Rate limited — wait before retrying

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Links

• API Documentation
• PostSyncer Dashboard
• API Authentication