Social media API for SaaS platforms

Add publishing, an inbox and analytics to your product in days. You build the feature, Zernio carries the platforms underneath.

Start for free Read the docs

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Join 200,000+ of the world's most ambitious developers and builders

Why Zernio?

Connect every platform yourself, or build on one API

Connecting each platform yourself

An app review per platform
Weeks of approvals before your first post goes out.
Every platform works differently
Its own OAuth, media rules, rate limits and errors.
Infrastructure to run
Token refresh, queues, retries and webhooks are yours.
Maintenance that never ends
Each API change is another build for your team.

Building on Zernio

Approvals already done
Your users connect through Zernio's approved platform apps.
One request shape for every platform
Official APIs underneath. The only limit is the platform's own.
Multi-tenant from day one
One profile per customer, with no cap on profiles.
We absorb the API changes
You ship once, and it keeps working.

How It Works

How a connection is built, in three steps

New customer signs up

POST /v1/profiles

Casa Lumen

profile created

Create a profile per customer

Each customer of yours gets their own profile. Their accounts, posts and data never mix with anyone else's.

Connect InstagramConnect

Approved on InstagramaccountId

Back in your app, at your redirect URL

Your user clicks Connect

They approve on the platform's own screen and land back in your app with a connected account. You never register a developer app or touch a token.

POST /v1/posts3 platforms

webhook · post.published200

Publish on their behalf

One request posts to every account they connected. Webhooks tell your app when it's live, or why it failed.

What you can build

The social features your users ask for, inside your product

Our spring collectionScheduled

Lands Friday. Early access for subscribers opens tomorrow at 9.

Thu, 12 Mar · 09:00 · Europe/Madrid

Publishing and scheduling

Posts, Reels, Stories, carousels and video to every major platform, from a composer that lives in your app.

Your productAnalytics · Casa Lumen

Reach184.6K

Engagement6.4%

Followers+1,203

Last 30 days

Analytics in your own dashboards

Every platform's metrics in one format, so your charts work the same for each of them.

Comments, DMs and reviews

Give your users one inbox for every conversation.

Ads from the same API

Let users boost a post or run campaigns without leaving your app.

Webhooks for everything

Post status, new messages and disconnects arrive as they happen.

“We tried to build it ourselves, but it was a really long project we didn't want to waste time on. With Zernio, users connect with their own OAuth, on their own accounts, and publishing happens on their behalf, which is exactly what we needed.”

Lautaro SuarezCTO & Co-Founder, Vibiz

Read the full story

70,000+ posts automated

Build it in code

You build the feature. We carry the rest.

OAuth, platform approvals, token refresh, rate limits, media rules and API changes are ours. One REST API and 8 SDKs are yours.

Read the docs

GET /v1/connect/{platform}

# the link behind your "Connect Instagram" button
curl "https://zernio.com/api/v1/connect/instagram
  ?profileId=PROFILE_ID
  &redirect_url=https://app.yourproduct.com/social" \
  -H "Authorization: Bearer $ZERNIO_API_KEY"

{
  "authUrl": "https://..."
}

Build it with an agent

Or let your coding agent wire it up

The docs ship as llms.txt and an OpenAPI spec, and the MCP server gives Claude Code or Cursor the live API to test against.

See how agents connect

claude code

> add a "Connect Instagram" button to
  our settings page using Zernio

read · docs.zernio.com/llms-full.txt
edit · app/settings/social.tsx
edit · app/api/social/connect/route.ts
done · connect flow wired to /v1/connect

> now schedule a test post

call_tool · posts_create · 1 account
done · scheduled, webhook received