Best social media APIs for AI agents
Six products that let an agent publish to social platforms through an API or MCP server. We make one of them. We have tried to write the page we wanted to read before we started — sourced, unflattering where it should be, and clear about when someone else is the better buy.
| Product | Entry price | Platforms | Best for |
|---|---|---|---|
| Ayrshare | From $149/mo per social profile. No free tier. | 14 networks, including WhatsApp | Platforms and agencies reselling to end clients |
| Postiz | From $29/mo for 5 channels. Free to self-host (AGPL-3.0). | 34, counting blogs, Discord, Slack and Nostr | Self-hosting, and anyone with more than ten accounts |
| Zernio | First 2 accounts free, then $6/account/mo (graduated). | 16 per their homepage | Teams that need DMs, comments and paid ads in one place |
| post-bridge | From $29/mo for 5 accounts. REST API is a $5/mo add-on. | 9 | Creators publishing at high volume |
| Blotato | From $29/mo for 20 social accounts. API and MCP need a paid plan. | 9 | Generating the content as well as publishing it |
| Chirpie | Free for 50 posts/mo. $9 Agent, $19 Starter, $49 Pro. | 8 live, 6 more coming soon | Agents and scripts that need to publish, starting free |
Figures verified against each vendor's own pricing pages, as of September 2026. The pricing units are not directly comparable — see each comparison page for the maths at 1, 3 and 10 accounts.
How to actually choose
Start with the unit you are billed on. This is the single thing that decides cost, and every product here picks a different one. If you have a few accounts posting a lot, per-account pricing wins. If you have many accounts posting occasionally, per-post pricing wins. Headline prices tell you almost nothing until you know which shape you are.
Then check scope. Publishing is the easy part. DMs, comment moderation, paid ads, and AI generation are where these products genuinely diverge, and adding one of them later usually means changing vendor rather than changing plan.
Treat MCP support as table stakes, not a feature. Every product on this list shipped one. What differs is how many tools it exposes and whether it is gated behind a paid plan. A large tool surface helps if you need the breadth and hurts if you are trying to keep an agent predictable.
If X is a major channel, price it separately. X charges $0.200 for every post containing a link, and some vendors pass that straight through to you while others absorb it. That one line can exceed the subscription. Our X API pricing calculator will give you the number.
Common questions
What is the best social media API for AI agents?
It depends on what the agent needs to do. For reselling to end clients, Ayrshare's multi-tenant profile model is the most mature. For self-hosting, Postiz is the only serious open-source option. For DMs, comments and paid ads alongside publishing, Zernio has the broadest scope. For AI content generation, Blotato. For high-volume creator publishing, post-bridge. Chirpie is the narrowest — publishing only — but is the only one whose free tier includes full API and MCP access.
Which social media APIs have an MCP server?
All six covered here ship a first-party MCP server, as of September 2026. Ayrshare's Action MCP exposes 27 tools, Postiz 11, Blotato 35, and Zernio several hundred with OAuth 2.1. post-bridge includes MCP on every tier. Chirpie hosts one at chirpie.ai/mcp. MCP support is no longer a differentiator in this category — pricing model and scope are.
Is there a free social media posting API?
Chirpie's free plan includes 50 posts a month with full API and MCP access. Zernio's first two connected accounts are free with unmetered posting. Postiz can be self-hosted free under AGPL-3.0, though you must register developer apps with each network yourself. Ayrshare, post-bridge and Blotato have trials rather than free plans.
Why do these products' prices look so different?
Because they meter different things, and the units are not directly comparable. Ayrshare charges per tenant profile, Postiz and post-bridge per connected channel, Zernio per account on a graduated scale, Blotato per plan with AI credits, and Chirpie per post volume. A workload that looks cheap on one model can be expensive on another, so compare against your actual shape rather than the headline number.
How current is this comparison?
Every figure was verified against the vendors' own pricing and documentation pages in September 2026, and each page links its sources. Pricing in this category changes often. Check the linked source before making a decision, and tell us if you find something out of date.
Sources
- Ayrshare pricing — https://www.ayrshare.com/pricing/
- Ayrshare docs — https://www.ayrshare.com/docs/
- Ayrshare Action MCP server (27 tools) — https://www.ayrshare.com/docs/additional/mcp-action-server
- Ayrshare — how many social accounts can I connect — https://www.ayrshare.com/docs/help-center/product/how_many_social_accounts_can_i_connect
- Ayrshare — posting and API call limits — https://www.ayrshare.com/docs/help-center/product/how_many_posts_and_api_calls_can_i_make
- Ayrshare rate limits (HTTP 429) — https://www.ayrshare.com/docs/errors/errors-http
- Postiz pricing — https://postiz.com/pricing
- Postiz cloud plans — https://docs.postiz.com/cloud/plans
- Postiz supported platforms — https://docs.postiz.com/general/platforms/overview
- Postiz MCP server — https://docs.postiz.com/mcp/introduction
- Postiz public API — https://docs.postiz.com/public-api/introduction
- Postiz source (AGPL-3.0) — https://github.com/gitroomhq/postiz-app
- Zernio pricing — https://zernio.com/pricing
- Zernio rebrand notice (Late to Zernio) — https://zernio.com/rebrand
- Zernio for agents (MCP, SDKs, CLI) — https://zernio.com/agents
- Zernio homepage (platform list) — https://zernio.com/
- post-bridge pricing — https://www.post-bridge.com/pricing
- post-bridge for agents (platforms, MCP) — https://www.post-bridge.com/agents
- post-bridge API overview, access and pricing — https://support.post-bridge.com/api/post-bridge-api-overview-access-and-pricing
- Blotato pricing — https://blotato.com/pricing
- Blotato product facts (platforms, credits, limits) — https://www.blotato.com/ai-info
- Blotato MCP server — https://help.blotato.com/api/mcp
- X API pricing — https://docs.x.com/x-api/getting-started/pricing