# Social media MCP vs API: which one you need

> If you're building software that posts on behalf of many users, you need an API: each network's official one (Meta, TikTok, LinkedIn) or a unified provider like Ayrshare, Upload-Post or Outstand. If you want your AI assistant to publish, reply and read metrics for your own brands, you don't need to code: connect an MCP server like HeyMark's over OAuth. HeyMark has no public REST API yet.

By HeyMark · Reviewed by Crescente Martinez, CMO and co-founder of HeyMark · Updated September 25, 2026

Social media MCP vs API comes down to who's doing the work. If you're building software that posts on behalf of many users, you need an API. If you want your AI assistant to publish, reply and read metrics for your own brands, you don't need to write code: an MCP server is enough. This page helps you figure out which case you're in, with the real options on each side as of September 2026.

## What a social media API is, and who needs one

An API is the door a program uses to talk to Instagram, TikTok or LinkedIn: it publishes, reads metrics, pulls comments. You use it by writing code. Your application stores each account's permissions, handles errors and adapts whenever the network changes something.

You need one if you're building a product that posts for its customers (a scheduler, a CRM, a creator platform) or connecting social networks to an internal system that speaks REST. If what you run is your own brand, or your clients' brands, there's usually a shorter path.

## The routes if you're building software

### Each network's official API

Meta (for Instagram and Facebook), TikTok and LinkedIn each have their own API. They're the direct source, but each one is a separate integration: you register an app on every platform, go through its approval and maintain the integration when the network changes. If you're after an API to post to Instagram, the official route is Meta's.

### A unified API provider

You integrate once and publish to several networks. These three are built for exactly that:

| Fact | HeyMark | Ayrshare | Upload-Post | Outstand |
| --- | --- | --- | --- | --- |
| Focus | End-to-end AI agent: plans, creates, publishes, replies and analyzes | Unified social media API for apps and platforms | Publishing API for developers, with an open-source MCP | Unified social media API for AI agents |
| Starting price | $12 USD a month (Creator: 1 brand, 1 person). Company: $30 USD with 3 brands and 5 people | Premium from $149 USD a month (1 profile) | Free plan (2 profiles, 10 uploads). Basic from $16 USD a month billed yearly ($24 monthly) | From $19 USD a month with 3,000 posts |
| MCP server | Yes, free on every plan. Publishes, replies to comments and DMs, moderates, automates and shares reports and calendars | Yes: 27 tools (publishing, analytics, comments and DMs) | Yes: 40 publishing tools, open source | Yes: 28 tools |
| Public API | No public REST API yet. Programmatic access is through MCP | Yes, REST with SDKs | Yes, REST with SDKs | Yes, REST |

Checked on each tool's public pages on September 25, 2026. Sources: Ayrshare: https://www.ayrshare.com/pricing/, https://www.ayrshare.com/docs/; Upload-Post: https://www.upload-post.com/pricing, https://www.upload-post.com; Outstand: https://outstand.so, https://outstand.so/mcp.

HeyMark uses Zernio as its integrations provider for the social networks. If you're building software, it's a good provider to evaluate alongside these three.

### The scheduler you already pay for

Check whether it has an API. Buffer has included one on every plan since May 2026. At Metricool the API is only on Advanced and Custom. Hootsuite's is a REST API with restricted access: it takes an approval and a paid plan.

## A social media API for AI agents, or an MCP server?

If the one doing the work is an AI agent acting for you, MCP is usually the better fit. MCP (Model Context Protocol) is a standard that lets an assistant like Claude, ChatGPT, Claude Code or Codex use a tool's actions with your permissions. You don't write code: you paste a URL, sign in and approve access.

HeyMark's MCP server lives at `https://mcp.heymark.ai`. It uses OAuth 2.1 with PKCE and dynamic registration, so there are no keys to generate: you sign in with your account and your assistant sees what you see and nothing else. With it, your assistant can:

- read your brands, calendar, captions and scripts, metrics, reports, audience demographics and inbox;
- create and edit posts, upload files, schedule, publish and duplicate;
- reply to comments and DMs, hide or delete comments, and create and turn on automations;
- share reports and calendars.

Before publishing now, replying on the platform, hiding or deleting a comment or changing an automation, it shows you a preview and waits for your approval. Scheduling runs directly. The limit is 60 tool calls per minute, and access is free on every plan; actions keep their AI credit costs.

HeyMark isn't the only one with MCP. Metricool, Buffer and Hootsuite have one too, and the difference is what each one covers. Metricool's documents 27 tools, 25 for reading and 2 for writing, and Buffer's has no comment or DM tools. The full comparison is in [the best social media MCP servers](https://heymark.ai/en/compare/best-social-media-mcp-servers/), and what you can do on a specific network, in the [Instagram MCP](https://heymark.ai/en/mcp/instagram/).

## Social media MCP vs API: how to decide

| What you want to do | What you need |
|---|---|
| Have your product post from its users' accounts | An API: each network's official one or a unified provider |
| Connect social networks to an internal system that speaks REST | A REST API. HeyMark doesn't have a public one yet |
| Have Claude or ChatGPT schedule, reply and report for your brands | An MCP server, like HeyMark's |
| Publish a file from your computer through Claude Code or Codex | HeyMark's MCP, which uploads the file and schedules it |

There's a guide for that last case: [Claude Code and Codex with HeyMark](https://heymark.ai/en/integrations/claude-code-and-codex/).

## What HeyMark doesn't have yet

HeyMark has no public REST API. The MCP server is the way in and covers reading and writing, but it's built for an assistant working under your sign-in, not for a backend posting across thousands of accounts. If you're building a product that posts from your customers' accounts, use the official API or a provider like the ones in the table. If it's your own brand, or your clients' brands, MCP saves you the integration: your assistant does the work, with each brand's approvals and voice.

## How to connect HeyMark's MCP

- **Claude (web and Desktop):** Settings, Connectors, Add custom connector. Paste `https://mcp.heymark.ai` and approve access when HeyMark opens. Step by step in [HeyMark in Claude](https://heymark.ai/en/integrations/claude/).
- **Claude Code:** `claude mcp add --transport http heymark https://mcp.heymark.ai`
- **Codex:** `codex mcp add heymark --url https://mcp.heymark.ai`
- **ChatGPT:** turn on developer mode in settings and add a connector with the same URL. Without it, ChatGPT won't run actions like creating or publishing.

Then ask your assistant to list your brands. If it answers with yours, you're connected.

## Frequently asked questions

### What is a social media API?

It's the interface a program uses to publish, read metrics or pull comments from a network without a person opening the app. You use it by writing code and storing each account's permissions.

### Is there a free social media API?

Upload-Post has a free plan with 2 profiles and 10 uploads, and Buffer has included its API on every plan, the free one too, since May 2026.

### Can I post to Instagram with an API?

Yes, with Meta's API or through a unified provider, but you have to build the integration. If you just want your assistant to post to your account, connect an MCP server and ask for it in the chat.

### Does HeyMark have an API?

Not a public REST API yet. Its MCP server is the way in, and it covers both reading and writing.

### What's the difference between an API and an MCP server?

Your code uses an API; your AI assistant uses an MCP server. With MCP you don't write integrations: you add the URL, sign in and ask for tasks in plain language.

### Is it safe to connect my account over MCP?

With HeyMark you sign in with OAuth and your assistant sees what you see, with your permissions. Before publishing now, replying on the platform or deleting comments it shows you a preview and waits for your approval, and you can revoke access whenever you want.

## See it on your own accounts.

Connect Instagram, TikTok, Facebook, LinkedIn or YouTube and use HeyMark free for 14 days. Mark answers in your voice, and you approve what goes out.

[Start free](https://app.heymark.ai) · [See pricing](https://heymark.ai/en/#pricing)

## Keep reading

- [Connect Instagram to Claude to post, reply and analyze](https://heymark.ai/en/integrations/claude/): Connect Instagram to Claude with HeyMark's custom connector: analyze your posts, plan the month, schedule, and reply to comments and DMs with your approval.
- [Post to social media from Claude Code and Codex](https://heymark.ai/en/integrations/claude-code-and-codex/): Connect Claude Code or Codex to HeyMark's MCP server with one command: upload local files, schedule campaigns with your approval, write reports to markdown.
- [Best social media MCP servers in 2026: 9 compared](https://heymark.ai/en/compare/best-social-media-mcp-servers/): The best social media MCP servers, compared with dated data: which ones publish, which reply to comments and DMs, how they connect and what they cost.
- [Instagram MCP server: run your account from Claude or ChatGPT](https://heymark.ai/en/mcp/instagram/): An Instagram MCP server for Claude and ChatGPT: schedule Reels and carousels, reply to comments and DMs after you approve, and build comment-to-DM automations.

## Developer and agent resources

- [HeyMark MCP documentation](https://heymark.ai/en/mcp/)
- [llms.txt](https://heymark.ai/llms.txt)
- [Full site content for language models](https://heymark.ai/llms-full.txt)
- MCP protocol endpoint: `POST https://mcp.heymark.ai`
- OAuth protected-resource metadata: [/.well-known/oauth-protected-resource](https://mcp.heymark.ai/.well-known/oauth-protected-resource)
- MCP server card: [/server-card](https://mcp.heymark.ai/server-card)