The social media and messaging API for developers and AI agents

Zernio offers one API to publish, message, advertise, and talk to your customers across 16 channels

Start for free

Using an AI agent? Copy a setup prompt and it connects over MCP.

Join 70,000+ of the world's most ambitious developers and builders

Warner Music Group
ClickUp
Vibiz
RE/MAX
Heymark
Holo

Marketing infrastructure

Every channel behind one integration

One integration covers social, messaging, voice, and ads. Platform changes, token rotations, and rate limits are ours to absorb.

Image

POST /v1/posts

ImageImageImage

Launch day!

Published August 12, 2026 at 11:21

  • InstagramReelpublishedView
  • LinkedInPostpublishedView
  • TikTokVideopublishedView
Learn more

“Zernio is great.”

Guillermo Rauch

CEO, Vercel

Image

Unified Social Media API

Everything social, not just posting

Go from signup to your first post, message, report, or ad in under 5 minutes.

  • Reels, stories, and DMs in one API

    Instagram
    northsupply
    1,284 likesnorthsupply Winter drop is live. Story and reel go out at six.
    Image
  • Publish videos and read every metric

    TikTok
    FollowingFor You
    @casa.lumen · 1-28Behind the winter drop, shot in one take.Original sound · casa.lumen
    184K12.4K218
    Image
  • Tweet, thread, and reply at scale

    X
    Meridian Tools@meridiantools

    Shipping notes, part one: the new dashboard is live in every region as of this morning.

    24112839
    Meridian Tools@meridiantools

    Part two: replies come back on the same webhook, so nothing needs polling any more.

    24112839
    Image
  • Post as a person or a company page

    LinkedIn
    Search
    • Nadia OkaforHead of Growth at Kestrel Studio · 2h

      Three years in and the team has doubled. What we learned about hiring slowly:

      128 · 14 comments
      LikeCommentRepostSend
    • Kestrel Studio4,182 followers · 5h

      We are hiring across engineering and design.

      302 · 41 comments
      LikeCommentRepostSend
    Image
  • Pages, reels, and comments covered

    Facebook
    Rowan & FoxPage · 2h

    Ten new colourways went live this morning.

    12814 comments
    • Priya RamanAny chance of a restock on the navy?Like · Reply · 1h
    • Rowan & FoxFriday, and it ships the same day.Like · Reply · 44m
    Image
  • Ship threads without the Meta setup

    Threads
    orbitlabs2m

    Shipped it. No app review, no second account, no waiting.

    Posted through the API
    orbitlabs1h

    Same payload as the X post, one field different.

    orbitlabs4h

    Queued the next three from the same call.

    orbitlabs1d

    Replies come back on the webhook.

    Image
  • Upload, schedule, and moderate videos

    YouTube
    ContentFilter
    • Inside the new studioPublic·Jan 2812,480 views94
    • How we shoot a drop in one takePublic·Jan 248,204 views51
    • Spring previewScheduled·Feb 3, 09:00Goes out in 6 days0
    • Studio tour, part twoScheduled·Feb 10, 17:00Goes out in 13 days0
    Image
  • Pins and boards straight from code

    Pinterest
    Search for an idea
    SaveSaveSave
    Image
  • Post to the open network in one call

    Bluesky
    DiscoverFollowingDesign
    Harbor & Co@harborandco.com · 2h

    New site is up, and the handle is just the domain.

    Harbor & Co@harborandco.com · 5h

    Same post went to four other networks in the same call.

    Harbor & Co@harborandco.com · 9h

    Replies land on the same webhook as everywhere else.

    Harbor & Co@harborandco.com · 1d

    Queued the rest of the week from one endpoint.

    Image
  • Submit and moderate across subreddits

    Reddit
    Modqueue3 boards
    • 1.2kr/webdev· 3hWe replaced six SDKs with one endpoint148 comments
    • 684r/SaaS· 6hScheduling posts without running a queue92 comments
    • 417r/devops· 9hWebhooks we stopped polling for38 comments
    Image
  • Spotlight and saved stories via API

    Snapchat
    Saved Stories2 of 42
    • SpotlightLaunch dayJan 28
    • Studio tourJan 24
    Saved to Memories
    Image
  • Post, reply, and moderate in servers

    Discord
    Foundry Club
    • general
    • announcements3
    • support12
    • releases
    • standup
    Image
  • Bots and channels from one token

    Telegram
    Tidewater Coffee12,480 subscribers
    • New roast is in. Restock alerts land here first.9.1K18:04
    • /stock ethiopia18:06
    • BotEthiopia: 42 bags left. Next roast is Friday.8.8K18:06
    Image
  • Reach teams inside their workspace

    Slack
    general40
    • Vela NotificationsAPP2:41 PMPayment received, €2,400 from Acme Corp. Invoice #1042 is now marked as paid.
    • Marta Ruiz2:43 PMGreat, I'll close it out on the finance board.

    Message

    Image
  • Local posts, reviews, and replies

    Google Business
    Marlow BakeryBakery · Barcelona4.8(218)
    Elias Duarte2 days ago

    Grabbed a loaf on the way to work and it was still warm. Worth the queue.

    Response from the ownerThanks Elias. Fresh batches come out at seven, and the listing says so on its own.
    See all reviews
    Image

Advertising API

Run campaigns without seven ad managers

Meta, Google, LinkedIn, TikTok, Pinterest, X, and OpenAI Ads. One set of endpoints, one shape coming back.

Summer saleact_1234567890Active
CampaignSales · Purchase
Ad set$50/day · United States
AdImage · Learn more
Offline maps for every trailtrailkit.app/proLearn more
  • X Ads
  • Meta Ads
  • LinkedIn Ads
  • Pinterest Ads
  • Google Ads
  • TikTok Ads
  • OpenAI Ads
LinkedIn Marketing PartnerMeta Business PartnerPinterest Business PartnerTikTok Marketing PartnerX Official Partner

Communication API

Infrastructure for your voice agents and chatbots

One unified API for WhatsApp, SMS, and calls, all using the same number and billing.

Voice & Calls

Add voice calling into your app and connect your AI agent

Remind MeMessage
DeclineAccept
Image
+1 (415) 555-0142AI Agent
SMS & MMS

Send and receive SMS with carrier registration handled

+1 (415) 555-0142

Your order #4821 has shipped 📦

Track it: acme.co/t/4821

Yes! You can change the shipping address.

WhatsApp

Build WhatsApp messaging and calling into your product or bot

Today

Don't miss out!

Hi Marc, for the next 24 hours only, all winter jackets are 50% off.

🛒 Shop the collection: zernio.shop/sale

The North Store

12.00

You

Don't miss out!

Hi Marc, for the next 24 hours only, all winter jackets are 50% off...

Oh nice, been waiting for these 👀

12.00

Phone Numbers

Calls, SMS, and WhatsApp, all on one number

Search, buy, and verify phone numbers in 54 countries via Zernio API.

ImageGet a phone number

Choose a country

Pick where your number is based.

Search countries...

Filter
Country ^Price
Image
United States(US)
2 types
$3/mo
Image
Estonia(EE)
Documents required
$4/mo
Image
Australia(AU)
2 types
from$3/mo
Image
Sweden(SE)
3 types
from$3/mo
Image
Brazil(BR)
Documents required
$5/mo
Image
Netherlands(NL)
2 types
from$3/mo
AT
Austria(AT)
2 types
from$3/mo

Customer stories

What teams build on top of Zernio

“We're now at the level where we're thinking, this is actually pretty good to have in our platform. But as soon as clients ask for more, I know with Zernio we can add those things quickly.
Danijel DercksenDigital Director, ACT.agency
Danijel Dercksen
Read their story
The ACT.agency team
Image

Built for enterprise scale

Run 2,000+ connected accounts across your workspaces without losing track of who did what. Custom pricing and a direct line to engineering.

  • SSO Authentication
  • MFA
  • SCIM
  • RBAC
  • Audit logs
  • SOC 2
Talk to sales

Integrate

Three ways in. Same API behind all of them

Write it yourself with the SDKs, hand it to an agent over MCP, or run it from a shell.

Write it once, in your language

Eight SDKs across 16+ platforms, plus the raw REST API.

Read the docs
import Zernio from '@zernio/node';
const zernio = new Zernio(); // reads ZERNIO_API_KEY
const { data: post } = await zernio.posts.createPost({
body: {
content: 'Hello world from Zernio!',
platforms: [
{ platform: 'twitter', accountId: 'acc_xxx' },
{ platform: 'linkedin', accountId: 'acc_yyy' },
{ platform: 'instagram', accountId: 'acc_zzz' },
],
publishNow: true,
},
});

70,000+ builders

What developers say after shipping

  • Image
    Elena ZarinoWeb Developer

    I integrated Zernio's API and MCP into my Claude Copilot and Claude Code setup, and it filled a gap I'd been working around for a while.

  • Image
    LeonFounder, Moving Monkey

    We're integrating Zernio into our coaching app's WhatsApp inbox and love how clean the SDK is. Thank you for that.

  • Image
    JustinFounder, StandoutResults

    We'd been using the HighLevel API for social posting, every post stuck in draft, a lot of hassle. Zernio has been a breeze to work with.

  • Image
    MarkoDeveloper, Meta Ads API

    It works flawlessly now. Superb, as always. You and the team rock, keep up the amazing work.

  • Image
    Razvan GhetiuFounder, purplepalm.ai

    I use Zernio for my SaaS purplepalm.ai. Integration was incredibly easy - had everything up and running in less than an hour. The API is super straightforward.

  • Image
    Dev SinghFounder, ad-attribution SaaS

    I love the speed and quality here, the API is awesome. I've never seen anyone ship integrations this fast.

  • Image
    JimDeveloper

    Zernio makes programmatic multi-platform posting as simple as I've ever seen it. The API is straightforward, well-documented, and it just works.

  • Image
    ChrisFounder, captureflow.ai

    I'm building captureflow.ai on Zernio and I love the platform. Super happy to be using you guys.

  • Image
    ZahareusDeveloper

    I spent a long time looking for a simple way to integrate a self-hosted stack. Zernio was just perfect, and I highly recommend it.

Frequently Asked Questions

Ship your first channel today

No credit card, no sales call. Connect an account, publish, and see the webhook come back in minutes.

  • SOC 2
  • GDPR compliant
  • 99.97% uptime
  • Free to start
Image