Zernio

Zernio is a developer-first social media and messaging API built by a seven-person bootstrapped team based in Girona, Spain. It provides a single REST API to publish content, manage DMs and comments, run paid ads, and pull analytics across 15 social and messaging platforms. The product was previously known as getlate.dev before rebranding to zernio.com.

What It Is

Zernio sits in the unified API category for social media infrastructure. Instead of building and maintaining separate integrations for each platform, developers connect once to Zernio and get access to posting, scheduling, inbox management, analytics, and advertising across Instagram, TikTok, X/Twitter, Facebook, LinkedIn, YouTube, Threads, Reddit, Pinterest, Bluesky, Snapchat, Google Business, WhatsApp, Telegram, and Discord. The platform also ships an MCP server with 280+ tools so AI agents using Claude, Cursor, or any MCP-compatible client can post, run ads, and manage DMs in plain language.

How the Integration Works

Zernio is designed to go from signup to first API call in under five minutes. The setup path has three steps:

• Get an API key — sign up and retrieve a key in about 30 seconds, no credit card required for the first two accounts.
• Connect channels — link social accounts, WhatsApp numbers, and ad accounts via a hosted OAuth flow; no developer app creation needed on the user's side.
• Call the API — a single POST /posts call publishes to up to 15 platforms simultaneously; text, image, video, and carousel formats are supported.

Webhooks fire on post success or failure, eliminating polling. The platform auto-retries failed posts and reports the failure reason via webhook.

Platform and AI Agent Support

Beyond standard social platforms, Zernio supports three messaging channels (WhatsApp, Telegram, Discord) and six ad networks (Meta Ads, Google Ads, LinkedIn Ads, TikTok Ads, Pinterest Ads, X Ads). Developers can provision dedicated WhatsApp phone numbers in 54 countries through a single API call, with Zernio handling the regulatory KYC paperwork. The MCP server integration means AI agents can manage the full social workflow — posting, advertising, and inbox — without custom tooling. The platform is white-label friendly, meaning end users never see Zernio branding.

Architecture and Reliability

Zernio's infrastructure runs on Vercel with global edge distribution. The company publishes a public status page and full logs for every API call made on a user's behalf. The pricing page states 99.7%+ uptime and over 1 million posts delivered. X/Twitter API costs are passed through at exact X rates with zero markup, and WhatsApp number costs are passed through at cost with no markup on carrier connection fees.

Update: Rebrand from getlate.dev

The product launched under the name getlate.dev and rebranded to zernio.com, as noted on the homepage. A public changelog is maintained at docs.zernio.com/changelog. The team describes an API-first development philosophy: every feature starts as an endpoint before shipping in any other form. The company is bootstrapped, founded in 2025, and has not taken outside funding.