Social media API: one key to post to 9 networks

Antwork is a social media API with one key for X (Twitter), LinkedIn, Facebook, Threads, Instagram, YouTube, TikTok, Pinterest, and Bluesky. Your code calls the REST API to publish or schedule on any of them, and the same key works for an agent on Antwork's MCP endpoint. You never build a platform app or pass an app review: you connect each account once in Antwork and post to it by id.

Endpoints

Five endpoints, all under https://antwork.io/api/v1, all authenticated with the same key:

• POST /posts creates one post per target account. Up to 25 accounts per request, with per-account copy in texts, or one entry per post in posts, each with its own hashtags, tags, media and settings. It answers 202 with a result per target, because a target fails alone: X refusing a long body does not cancel the LinkedIn post beside it.
• GET /posts/{id} returns one post and its status. Publishing runs in the background, so this is how you see it go out.
• GET /posts lists your posts, filtered by status and paged with a cursor, up to 100 a page.
• DELETE /posts/{id} removes a post from Antwork. With deleteFromPlatform=true it also queues deletion of the live post, and says which networks do not support that.
• GET /accounts lists the accounts you connected, with their ids and token health.

Send an Idempotency-Key header on POST /posts and a retried request returns the first answer instead of posting twice. Fields and every error code are in the API reference.

Your first post in two requests

Create a key in Settings → Developer, then:

# 1 · list the accounts you connected
curl https://antwork.io/api/v1/accounts \
  -H "Authorization: Bearer $ANTWORK_API_KEY"

# 2 · create and schedule a post
curl https://antwork.io/api/v1/posts \
  -H "Authorization: Bearer $ANTWORK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: launch-post-1" \
  -d '{"accounts":["<accountId>"],"text":"Shipped v2 today.","scheduledFor":"2026-11-03T09:00:00Z"}'

Leave out scheduledFor to publish now, or send "draft": true to save it for review. A draft needs the write scope; a post that goes out needs publish. Media goes in media as URLs from your Antwork library: an external URL is refused with media_not_hosted before anything is created, rather than failing at publish time.

TikTok, and the same key for agents

The REST API takes X (Twitter), LinkedIn, Facebook, Threads, Instagram, YouTube, TikTok, Pinterest, and Bluesky. TikTok is the one network where a person stays in the loop: TikTok requires the account owner to choose each post's audience, so your code creates the TikTok post as a draft and the owner picks the audience in Antwork, at the draft's settingsUrl. Until then a TikTok publish is refused with tiktok_privacy_required.

For an agent, send the same key to Antwork's MCP endpoint, which any MCP client or agent SDK can call with a static header:

claude mcp add --transport http antwork https://api.antwork.io/mcp \
  --header "Authorization: Bearer $ANTWORK_API_KEY"

The scopes behave the same on both surfaces. Setup for Codex and the Claude Agent SDK in TypeScript and Python is in the MCP reference. Instagram only connects Creator or Business accounts; switching is free and needs no Facebook Page.

What each network requires

Every post is checked against these rules on both surfaces: a draft is flagged, and a post that breaks one is refused before it publishes. The table is generated from the same rules file the publishers validate against, so it cannot disagree with what the API enforces. A Pinterest pin also goes to a board, picked from the account's boards. File sizes, formats and duration ceilings are in platform specifications.

Pricing

The API is priced like the app. The first 2 connected accounts are free, and each account after that is $5 a month. Posts are not counted on any plan, and the API has no separate fee. Each key has a ceiling of 10,000 calls a day and 120 a minute, to stop runaway loops rather than ration normal use. See pricing.

When another API fits better

If you need Reddit, Snapchat, Telegram, WhatsApp or Google Business Profile, Ayrshare lists them and Antwork does not. If you already schedule with Buffer, its GraphQL API reaches the channels you have there. Antwork fits when you post for one brand, want to start free, and want your agent and your code on the same accounts.