Zernio

One API to post everywhere. 16 platforms, zero headaches.·zernio.com·GitHub

Usage-based · Free plan See pricing ↓

Zernio is a unified REST API for social media publishing, messaging, and advertising across 16 platforms including TikTok, Instagram, Facebook, YouTube, LinkedIn, Twitter/X, and Threads. Developers can schedule posts, manage a shared inbox for DMs and comments, pull cross-platform analytics, and run paid ad campaigns on seven ad networks through one integration. It also supports voice calls, SMS, and WhatsApp messaging via dedicated phone numbers, and provides a hosted MCP server so AI agents can connect and post directly.

What it's for

Publish or schedule social content programmatically to one or many platforms with a single API callAdd white-label social publishing to a product via OAuth connect flowsSend and receive messages across WhatsApp, Instagram DMs, Facebook Messenger, Telegram, and X DMs through one unified inboxRun paid ad campaigns across Meta, Google, TikTok, LinkedIn, Pinterest, X, and OpenAI AdsRead per-post and per-account analytics across platformsAutomate replies to comments and reviews and monitor mentionsBuild voice calling and SMS features into apps or AI agents using dedicated phone numbers

Features 18

8 official SDKs (Node, Python, Go, Ruby, Java, PHP, .NET, Rust)
Ads manager for boosting posts and running paid campaigns across 7 ad networks
Automated queue posting at optimal times
Bulk scheduling via CSV upload
CLI with 371 commands across 47 groups
Comment-to-DM automation
Comments API for reading, replying, and moderating
Content calendar with drag-and-drop
Cross-platform analytics (impressions, reach, engagement, follower tracking)
DMs API across 7 platforms
First comment auto-add on publish
Hosted MCP server for AI agent connectivity
Phone number provisioning for calls, SMS, and WhatsApp
Post scheduling with timezone support
Real-time webhooks for post status, messages, and comments
Team collaboration with unlimited members
Tools API for video downloading, transcripts, and captions
Unified REST API for 16 social platforms

At a glance

free tierAPI

TypeWeb app

DeploymentCloud

PlatformsWeb

Fordevelopers, AI agents, enterprises

CompanyZERNIO SOFTWARE, S.L. · 2025

Integrations

YouTubeMeta AdsRedditCodexClaude CodeTwitter/XMakeBlueskyTelegramLinkedInGoogle BusinessPinterest AdsLinkedIn AdsSlackDiscordTikTokSnapchatWhatsAppTikTok AdsX AdsGoogle AdsInstagramPinterestFacebookCursorOpenAI Adsn8nThreads

Complianceself-reported

SOC 2GDPR

Resources

Pricing

Pricing is usage-based per connected social account: first 2 accounts free, then $6/account/month (3-10), $3/account/month (11-100), $1/account/month (101+). X/Twitter API costs are passed through at X's exact rates with zero markup. A full machine-readable rate card (accounts, X pass-through, phone numbers, calls, SMS, WhatsApp) is published separately.

FreeFree

Unlimited posts, Full API access, Every feature included

First 2 connected social accounts free, unlimited posts, full API access, no credit card required

Self-serveQuote

Example given on the pricing page: 20 connected accounts (18 beyond the 2 free) costs 8×$6 + 10×$3 = $78/month.

Usage-based billing, card on file, cancel anytime, self-service at any scale

EnterpriseQuote

Custom pricing, contact sales.

Available past 2,000 connected accounts

Optional enterprise contracts with volume discounts from 2,000 accounts