9 social APIs for AI agents that reply and post (2026)
November 13, 2026 · 7 min read
Your AI agent can post and answer comments and DMs without its own Meta app review if it connects through a tool that already holds Meta access. Of the 9 tools here, BetterSocials fits owners and small teams whose agent has to do both jobs, from $29 a month for 4 accounts. Composio suits developers wiring many apps into one agent, and Ayrshare suits software that posts for client accounts.
Sort the stack by job before you pick a tool
Meta app review is the check an app passes before Meta grants it certain messaging permissions. When a tool that already passed it holds the connection, your agent talks to that tool instead of to Meta.
So the real choice is which job your agent does. Some tools here cover the post, some cover the reply, and a few cover both:
- Replies and posting together: BetterSocials, Composio
- Posting first: Ayrshare, Blotato, Postiz
- Messages first: social-api.ai, Zernio, Manychat, respond.io
None of them lifts Meta's own limits. Instagram lets any app send a DM only within 24 hours of the person's last message, and a private reply to a comment goes out once, within 7 days of the comment.
How we checked each tool
We checked each tool for five things: posting, comment replies, DM replies, an MCP server or API key an agent can use, and a published price. An MCP server is a connector that lets an assistant such as Claude call a product's tools directly.
Composio and Manychat prices below are what their pricing pages showed in October 2026; Postiz's are from September 2026.
BetterSocials: both jobs in one inbox for owners and small teams
BetterSocials is an AI social media manager that posts to Instagram, Facebook, TikTok, YouTube, Threads and LinkedIn Company Pages, then puts every comment and DM from them in one inbox. Claude and ChatGPT connect to its hosted MCP server with the normal BetterSocials login, so there's no key to paste. Claude Code, Codex and your own scripts use an API key from Settings, then API and AI keys.
Claude runs every tool: read the inbox, draft and send replies in your voice, create and schedule posts, manage keywords and read analytics. ChatGPT connects through Developer mode on a paid plan, on the web. In a normal ChatGPT chat it can read the inbox and draft, but OpenAI keeps sending and publishing for Business, Enterprise and Edu workspaces.
BetterSocials drafts AI replies to comments and DMs from a voice profile built from your past replies, plus plain rules you write, such as your prices or booking link. When your rules don't cover a question, the comment or DM waits for you in Needs reply.
Plans are Creator at $29 a month for 4 accounts, Pro at $49 a month for 6 and Team at $99 a month for 12. Each starts with a 7-day free trial, card required.
BetterSocials doesn't connect WhatsApp, X or email, so a support desk that lives there needs another tool.
Composio: many apps in one agent, toolkit by toolkit
Composio is a developer platform that hands your agent an MCP URL and manages OAuth for each app, with automatic token refresh. Its Instagram toolkit has 32 tools for publishing, comments and DMs. Facebook has 45, and YouTube has 57.
Coverage stops in places. Composio's TikTok toolkit has no comments or DMs, and LinkedIn has no messaging tool.
On Composio's pricing page, Hobby is $0 for 100,000 tool calls a month with no card. Pro is $29 a month plus $0.0003 per call over the allowance. If your agent already spans many apps, Composio keeps social media inside that one setup, and you write the reply logic yourself.
Ayrshare: a unified API for software that posts for clients
Ayrshare is a unified social API for posting across networks, built for apps that manage many client accounts. You write the agent and the reply logic yourself. That suits a product team adding social features to its own software.
Blotato: publishing across networks on one key
Blotato suits creators who want one API key to publish across their networks. Blotato also publishes a guide titled Instagram Messaging API: Social Media DMs Without App Review.
Check what Blotato does for DM and comment replies before you build your inbox on it.
social-api.ai: the replies half for developers
If your team already has a model and prompts it trusts, social-api.ai supplies the plumbing to comments. The service is built for agents that read, reply to and moderate comments through one API, with an MCP server on top. You bring the AI and the voice.
Zernio: the messaging route when you build the replies yourself
Zernio publishes a developer guide to integrating the Instagram Messaging API, which suits teams that build the reply side themselves. The inbox, the voice and the rules are yours to build. For an engineering team shipping its own messaging product, Zernio is a reasonable base layer.
Postiz: a self-hosted scheduler for the posting half
Postiz is an open-source scheduler you can host yourself, with MCP built in and 37,288 stars on GitHub. Standard is $29 a month billed monthly, with Team at $39, Pro at $49 and Ultimate at $99, covering 5 to 100 channels.
Postiz has no inbox. Its post comments feature schedules your own first comment under your own post, so pair Postiz with a replies tool if your agent has to answer people.
Manychat: keyword flows on a contact meter
Manychat runs comment-to-DM flows on Instagram, Messenger, WhatsApp and TikTok. Pro is $39 a month for 2,500 active contacts, billed monthly, and each extra contact costs $0.05.
Multi-step flows and WhatsApp are where Manychat wins. For YouTube comments next to Instagram DMs, BetterSocials answers both from the same inbox.
respond.io: a messaging desk for support teams
The omnichannel messaging platform respond.io is built for support teams answering customers across many messaging apps. respond.io is built for support desks rather than posting, so a growth team still needs a scheduler beside it.
Which job each of the 9 tools covers
The table sums up each tool's main job, how an agent connects and what to check first.
| Tool | Main job | Agent connection | Watch for |
|---|---|---|---|
| BetterSocials | Replies and posting together | Hosted MCP server or API key | Read-only in a normal ChatGPT chat |
| Composio | Many apps in one agent | MCP URL with managed OAuth | No TikTok comments or DMs |
| Ayrshare | Posting for client accounts | Unified social API | You write the reply logic |
| Blotato | Publishing from one key | One API key, many networks | Check reply support first |
| social-api.ai | Comment replies for agents | API with an MCP server | You bring the AI and voice |
| Zernio | Instagram messaging builds | Instagram Messaging API guide | You build the inbox and rules |
| Postiz | Open-source scheduling | MCP built in, self-hostable | No inbox |
| Manychat | Comment-to-DM flows | Flow builder automations | Metered active contacts |
| respond.io | Omnichannel support desks | Support desk across channels | Built for support, not posting |
If your agent's job ends at the post, Postiz or Blotato covers it. If it ends at the reply and you have engineers, social-api.ai or Zernio gives you the pipe. For an agent that posts and answers the comments and DMs that come back, BetterSocials does both from one inbox. Our list of 10 AI social media managers for small businesses in 2026 covers the wider category.
Frequently asked questions
Which social API is best for an AI agent that answers comments and DMs?+
BetterSocials is our pick for owners and small teams. Claude or Claude Code connect through its MCP server or an API key, read one inbox and reply in your voice, and ChatGPT can read and draft, from $29 a month for 4 accounts. Composio suits developers wiring many apps together, and Ayrshare suits apps posting for client accounts.
Can my AI agent reply to Instagram DMs without Meta app review?+
Yes, through a tool that already holds Meta access, so your agent connects to that tool instead of to Meta. Instagram still lets any app send a DM only within 24 hours of the person's last message. A private reply to a comment goes out once, within 7 days of the comment.
Can ChatGPT post and reply through BetterSocials?+
Partly. ChatGPT connects to BetterSocials through Developer mode on a paid plan, on the web. In a normal ChatGPT chat it can read the inbox and draft, but it can't send a reply or publish a post, because OpenAI keeps write actions for Business, Enterprise and Edu workspaces. Claude runs every tool.
Can an AI agent send YouTube or TikTok DMs?+
No for YouTube: its Data API has no messaging, so every tool answers YouTube comments in public. TikTok DMs are reply-only, at most 10 replies within 48 hours of the person's last message, on a Business account. A TikTok comment can't trigger a private DM from any outside tool.
Do I need my own AI model key with BetterSocials?+
No. BetterSocials includes AI replies to comments and DMs on every plan, at 1 AI credit each: 1,000 a month on Creator, 2,000 on Pro and 4,000 shared on Team. When credits run out the AI pauses and never charges more on its own. For how other tools handle this, see [Do AI reply tools need an OpenAI key? 7 tools in 2026](https://theshippinglog.com/articles/do-ai-reply-tools-need-an-openai-key-7-tools-2026).
Does my agent send things without me?+
No, not unless you tell it to. Every send or post from a connected assistant happens on your instruction and goes through the same limits as the app. Inside BetterSocials, questions wait in Needs reply unless you turn on Answer questions too, which needs at least one AI rule first.