9 social APIs for AI agent replies and posts in 2026

Your AI agent doesn't need its own Meta app review to answer Instagram comments and DMs. It needs to connect through a tool that already holds Meta access, then work inside Meta's reply windows. For an operator whose agent has to answer comments and DMs and also post, BetterSocials fits best: Claude connects through its hosted MCP server, reads one inbox and replies in the owner's voice, from $29 a month for four accounts. Composio suits developers wiring many apps into one agent, and Ayrshare suits apps that post for many client accounts.

Start with the job: replies, posting or both

BetterSocials, Composio and the other seven tools here split cleanly by the job your agent does. Some answer comments and DMs. Some only publish. A few do both.

That split matters more than the API style. An agent that posts but can't read replies leaves the whole inbox to a person.

We checked four things for each tool: whether an agent can post, whether it can answer comments, whether it can answer DMs, and how the agent connects (an MCP server, an API key or a platform account). MCP, short for Model Context Protocol, is the standard Claude and other assistants use to call outside tools. Prices come from each vendor's own pricing page or a dated note, read in September and October 2026.

BetterSocials: best for owners whose agent answers comments, DMs and posts

BetterSocials is an AI social media manager for local businesses, creators and small agencies. It connects Instagram, Facebook, TikTok, YouTube, Threads and LinkedIn through their official APIs, and every comment and DM lands in one inbox.

Claude and ChatGPT connect to its hosted MCP server with the normal BetterSocials login, no API key. Claude runs every tool: read the inbox, draft and send replies in the owner's voice, create, caption and schedule posts, manage keywords and read analytics. Claude Code, Codex and your own scripts use an API key from Settings, then API and AI keys.

ChatGPT is narrower. In a normal ChatGPT chat it gets the read tools only, so it can read the inbox and draft but not send.

Every send or post from a connected assistant happens on the owner's instruction and goes through the same limits as the app. Plans are Creator at $29 a month for four accounts, Pro at $49 a month for six and Team at $99 a month for twelve, all with unlimited contacts. There is no Zapier or Make integration, so the MCP server and the API are the doors in. Growth Ops Weekly's Instagram AI reply tools in 2026: what 9 charge for the AI covers the AI side of those costs.

Composio: one OAuth layer for an agent that touches many apps

If your agent already calls many business apps, Composio puts social accounts behind the same managed OAuth. You create a session and get an MCP URL, and Composio handles token refresh.

Coverage depends on the platform. The Instagram toolkit has 32 tools, including publishing, comment replies and DMs, and Facebook has 45, including Messenger. YouTube has 57 for uploads and comment replies. LinkedIn has 25 with no messaging, and TikTok has 9 with no comments or DMs.

Composio's Hobby tier is $0 for 100,000 tool calls a month. Pro is $29 a month plus $0.0003 per tool call over the allowance, and only monthly prices are listed. You still write the agent, the voice and the reply rules yourself.

Ayrshare: posting and comments for many client accounts

Ayrshare publishes API documentation and a guide to social media posting and scheduling APIs. It suits a product that posts for many client accounts at once.

Ayrshare gives you the plumbing. Your team writes the agent, the reply logic and the voice it answers in.

Blotato: a guide to Instagram DMs without your own app review

Blotato publishes a guide titled "Instagram Messaging API: Social Media DMs Without App Review." That makes it a fit when your agent's first job is Instagram DMs.

Before you build an inbox on Blotato, check what it does for comment and DM replies on the platforms you need.

social-api.ai: a comments API with an MCP server

For a developer who wants the agent to read, reply to and moderate comments through one API, social-api.ai is built for that job. Its pages describe a social media API for AI agents with an MCP server and a free tier, and a comments API to read, reply and moderate.

You bring the AI and the voice. social-api.ai brings the connection to the platforms.

Zernio: a route into the Instagram messaging API

Zernio is for developers building directly on the Instagram messaging API. Its 2026 guide lays out two ways to integrate it.

Zernio points you at the integration. The inbox, the voice and the rules stay yours to build.

Postiz: open-source scheduling with MCP built in

Postiz is an open-source scheduler you can host yourself, with MCP built in and 37,288 GitHub stars on its main repository in October 2026. Standard is $29 a month billed monthly, Team $39, Pro $49 and Ultimate $99, covering 5 to 100 channels.

Postiz has no inbox. Its post comments feature schedules your own first comment under your own post, so an agent on Postiz posts but doesn't answer anyone.

Manychat: comment-to-DM flows on Instagram and WhatsApp

Manychat works on Instagram, Messenger, WhatsApp and TikTok. It suits multi-step comment-to-DM flows, built in its flow builder.

Manychat Pro is $39 a month with 2,500 active contacts, billed monthly. Each active contact past the allowance costs $0.05 on Pro.

If the agent also answers YouTube comments, BetterSocials puts them in the same inbox as Instagram and Facebook DMs.

respond.io: a support desk across many messaging apps

For support teams answering customers across many messaging apps, respond.io is an omnichannel messaging platform.

respond.io is built for support desks, not posting, so pair respond.io with a scheduler if the agent also publishes.

Which Meta limits apply whichever tool you pick?

Meta's reply windows apply to BetterSocials, Manychat and every other tool on this list, because they all send through the same API. Instagram only lets an app send a DM within 24 hours of the person's last message. Every new message from that person restarts the clock.

A private reply, the DM an account sends to someone who commented, has its own rule. Per Meta's private replies documentation, only one message can go to that person, within 7 days of the comment. The conversation continues only if they reply.

Where that message lands depends on the person. It goes to their inbox if they follow the account and to their message requests if they don't.

TikTok DMs are reply-only: at most 10 replies within 48 hours of the person's last message, on a Business account. YouTube's Data API has no messaging, so every tool answers YouTube comments in public.

Set up an agent on BetterSocials this week

BetterSocials wires to Claude in five steps, and an operator can run all of them before Friday.

1. 1Connect the accounts at Connected Accounts in BetterSocials. Each one signs in on the platform's own screen, so no password passes through.
2. 2Write the AI rules in Settings, then AI voice: prices, hours, the booking link. The agent answers from these facts.
3. 3Add the BetterSocials MCP server as a custom connector in Claude. Claude allows one custom connector on Free and more on Pro, Max, Team and Enterprise, and on Team and Enterprise an Owner adds it.
4. 4Ask Claude to read Needs reply and draft answers. Approve the first few by hand until the voice sounds right.
5. 5For scripts or Claude Code, create an API key in Settings, then API and AI keys, and give it to the job that needs it.

For a fuller look at the access side, see Is it safe to let an AI agent run your social accounts?.

The 9 tools side by side

Each row below is the job the tool does best for an agent and how the agent connects.

Postiz leans on publishing, and Manychat and respond.io lean on conversations. BetterSocials sits across both jobs.