Social media posting API for developers

Zernio's social media posting API lets you publish, schedule, and manage content across 16 platforms. Replace months of integration work with a single endpoint.

Start building freeView API docs
  • 16 platforms
  • Unlimited social accounts
  • One API
Post the launch image to Instagram, X, LinkedIn and Threads
Done, it's live on all four.
Simon Fairhurst@siimonfairhurst

Launch day 🚀 Pocket-sized, rugged, and already on every desk.

24.8K862141.203
Simon Fairhurst@siimonfairhurst

Launch day 🚀 Pocket-sized, rugged, and already on every desk.

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

Warner Music Group
MoFlo
ClickUp
Readdy
RE/MAX
Moving Monkey®
Supported platforms

One API. Every platform

Post to all 16 major platforms from one API

  • Reels
  • Stories
  • Carousels
  • Comments
  • DMs
  • Ads

Reels, stories, and DMs in one API

Publish, then answer the comments and DMs.

Explore Instagram
How it works

From signup to first post in three steps

1

Key name

e.g., Production API key

Permission

Read & write

Read only

Profile access

Full access (all profiles)

Create key

Get your API key

Sign up free, generate a key from the dashboard. First 2 social accounts free, unlimited posts.

2

Profile

Defaultdefault

Instagram

TikTok

X

LinkedIn

Facebook

Threads

YouTube

Pinterest

Bluesky

Reddit

Snapchat

Discord

WhatsApp

Telegram

Slack

iMessage

Google Business

Connect social accounts

Link accounts via OAuth. Each gets a unique ID for API calls.

3

Create post

Content

what's on your mind…

Add media

Start posting

One API call to publish across all 16 platforms. Ship your first post in under 5 minutes.

Features

Everything you need to publish

Our new living room collection

Scheduled
PublishesThu, 12 Dec · 09:00
TimezoneEurope/Madrid

Post scheduling & queues

Schedule with timezone support. Set up recurring queues or bulk-upload via CSV.

StoryReel
Image
Video
Carousel

Images, videos & carousels

Upload images, videos, carousels, Stories, and Reels. Auto-validation and resizing included.

Webhooks & events

Real-time notifications for post status changes and new analytics data.

First comment support

Auto-add first comments on Instagram, Facebook, LinkedIn, and YouTube.

n8n, Make & Zapier ready

Official n8n node plus webhook support for Make and Zapier workflows.

For AI Agents

Your agent posts, schedules, and manages content

496 tools on one OAuth connection. Nothing to install, nothing to self-host.

Know more

› claude

Claude Code v2.1.19

Opus 4.5 · Claude Max

~/software

›

✓ registered · https://mcp.zernio.com/mcp

✓ signed in over OAuth · no key pasted

✓ call_tool · queued Thu 09:00 · LinkedIn, X

✓ nothing published yet · review it first

Claude Code session
Marketing infrastructure

Everything social, not just posting

Comments, DMs, analytics, and ads run on the same API and the same connected accounts.

  • Ads API

    Campaigns, boosts, and ad analytics in one API

    Meta Ads

    Pricing launch

    $412

    Summer Sale

    $40/day

    Active

    Retargeting

    $30/day

    Paused
  • Messaging API

    Every DM, one API

    @leahmarx Ship to Berlin?

    @sofia In stock? 😍

    @casa.lumen Order update? 🙌

  • Analytics API

    Every metric, one endpoint

    Views18.4K
    Likes3,410
    Views31.9K
    Comments58
    Total reach · last 7 days184.6K+12.4%
  • Comments API

    Moderate every comment

    sarah.klein

    Does this cover Threads as well?

    ReplyDMHide

    lauravisuals

    Shipped our whole calendar with this 🙌

    ReplyDMHide

    nate_builds

    Any way to schedule a carousel?

    ReplyDMHide
  • Comments to DM API

    Turn comments into DMs

    @lucia_dev Guide 🙌

    @andrewww_ Guide

    lucia_dev

    Here's the guide 👇 · now

    andrewww_

    Here's the guide 👇 · 1m

  • Scheduler API

    Schedule posts in every timezone

    Simon Fairhurst@siimonfairhurst

    Q3 recap is live 📈 Everything we shipped this quarter, in one place.

    Tue, Oct 14 · 09:00

  • Inbox API

    One inbox for comments, DMs, and reviews

    All platformsAll profilesAll accounts

    Olly Bennett

    · via +44 7700 900456

    Are you open on Sunday?

    2m

    Diego

    · via +1 646 555 0199

    Is my order ready to pick up?

    6m

    Nadia Okafor

    · via @nadia.okafor

    Love the new drop 😍

    9m

    Vela Notifications

    · via #orders

    New order #4821 from Lisbon

    20m

    Elias Duarte

    · via Google review

    ★★★★★ Worth the queue

    1h
  • Email API

    Read and send from Gmail and Outlook

    Lena FischerDemo on Thursday?
    now
    Contoso BillingInvoice INV-2041
    now
    northsupplyAny update on my order?
    9:40
  • Calendar API

    Events and open slots on every calendar

    Demo with Northwind

    Google Meet · 4 guests

    10:00

    Product review

    Teams · 6 guests

    12:00

    Free for everyone

    14:00 – 15:00 · 3 calendars

    Open
  • Files API

    Upload and share on Drive and OneDrive

    Launch photo.jpg
    Q4 report.pdf

Frequently asked questions

Ship your first post today

Generate a key, connect an account, and publish in under 5 minutes.

Start for freeRead the docs
  • 16 platforms
  • Unlimited social accounts
  • One API