Does Zernio Have an MCP Server?
Short answer: check their current docs, because this moved fast in 2026. What is certain: Socialync runs a native MCP server on every plan, free included, so Claude, ChatGPT, Cursor, and any AI agent can post to 8 of the 9 platforms Socialync supports. Socialync tells your AI to get your yes before each post, and in AI clients that support it you can switch on a confirmation dialog on the API Keys page.
The short version
Zernio, formerly Late, is an API-first platform with a hosted MCP server at mcp.zernio.com. It signs in with OAuth or a Bearer API key and works with Claude, ChatGPT, Cursor, Codex and VS Code. Zernio also ships SDKs and a CLI.
Socialync runs a native MCP server on every plan, free included. Add the URL to Claude, ChatGPT, or Cursor and sign in with OAuth (or paste an API key in a client that cannot open a browser), and your assistant can draft, schedule, and publish across every platform you have connected except Pinterest. That is what this page is about.
Zernio vs Socialync for AI posting
Zernio
Zernio, formerly Late, is an API-first platform with a hosted MCP server at mcp.zernio.com. It signs in with OAuth or a Bearer API key and works with Claude, ChatGPT, Cursor, Codex and VS Code. Zernio also ships SDKs and a CLI.
Socialync
- Publishes to 8 platforms from one MCP connection
- Publishes rather than only reading your accounts
- Included on every plan, with a free tier to start
- Duplicate prevention on instant publishes, so an agent retry cannot post twice
Zernio prices per connected account: the first 2 are free, accounts 3 to 10 cost $6 each a month, and the rate falls to $3 and then $1 at volume, with X API costs passed through at X's rate. Socialync includes its MCP server on every plan: the free plan reaches 7 platforms (X is on paid plans), and paid plans start at $20 a month for 5 accounts across all 8. Based on publicly documented features of Zernio as of October 2026. This market moves fast and several schedulers shipped MCP in mid 2026. Verify on the vendor site before deciding.
Where Socialync fits
Zernio is built for developers who want one API for social posting, messaging and ads, and it covers a long list of networks, Reddit, Telegram and WhatsApp included. Socialync is a scheduler first, a web and mobile app with an MCP server on top that publishes to 8 platforms from one connection.
Zernio prices per connected account: the first 2 are free, accounts 3 to 10 cost $6 each a month, and the rate falls to $3 and then $1 at volume, with X API costs passed through at X's rate. Socialync includes its MCP server on every plan: the free plan reaches 7 platforms (X is on paid plans), and paid plans start at $20 a month for 5 accounts across all 8.
How posting from your AI works
Add the server URL
Point Claude, ChatGPT, Cursor, or any MCP client at https://mcp.socialync.io/mcp. Sign in with your Socialync account in the browser and pick which brands the assistant may manage. No keys to copy.
Or use an API key
Clients that cannot open a browser (Grok Bot, headless agents, hand-edited config files) use an API key from Socialync settings as a Bearer token instead. One active key per account, limited to the brands you pick, revocable any time.
Post in plain English
Tell your AI what to publish. It shows you the exact post and publishes after your yes in chat, or saves a draft you approve in the app.
Frequently asked questions
Does Zernio have an MCP server?
Yes. Zernio, the platform formerly called Late, hosts an MCP server at mcp.zernio.com that signs in with OAuth or an API key and works in Claude, ChatGPT, Cursor and Codex. Socialync's MCP server works in the same clients and is included on every plan, free included.
Is Late the same as Zernio?
Yes. Late renamed itself Zernio, and its rebrand page says older SDK packages keep working for at least six months. If you were looking for the Late MCP server, Zernio runs it now.
What is an MCP server for social media?
MCP (Model Context Protocol) is the open standard for connecting AI assistants to external tools. A social media MCP server lets an AI like Claude or ChatGPT draft, schedule, and publish posts to your connected accounts in plain language. Socialync runs one across TikTok, Instagram, YouTube, X, LinkedIn, Facebook, Threads, and Bluesky.
Is Socialync a good Zernio alternative?
For anyone who wants an AI assistant to handle posting, yes. Socialync covers cross-posting, scheduling, and AI captions like Zernio, and its MCP server publishes to 8 of the 9 platforms (every one except Pinterest) from a single connection with duplicate prevention built in. MCP and API are included on every plan, with a free tier to start; unlimited posting starts at $20 per month for 5 accounts.
Keep reading
How AI agents post to 8 platforms through Socialync.
Best social media MCP servers in 2026The honest list of what can actually post for you.
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