---
title: "Zernio: Social Media Scheduling API"
description: "Developer-first REST API and hosted MCP server to post, schedule, and analyze content across 16 social platforms plus 7 ad networks."
canonical: https://zernio.com/
last-updated: 2026-08-24
---

# Zernio: Social Media Scheduling API

Zernio is a developer-first REST API and hosted MCP server that lets apps and AI agents post, schedule, and analyze content across 16 social platforms plus 7 ad networks, with one authentication model and one request shape.

Homepage: https://zernio.com

## What Zernio does

- **Publishing**: schedule or immediately post text, images, and video to Instagram, TikTok, YouTube, X/Twitter, LinkedIn, Facebook, Threads, Pinterest, Reddit, Bluesky, WhatsApp, Telegram, Discord, Snapchat, and Google Business.
- **Ads**: unified campaign management across Meta Ads, Google Ads, TikTok Ads, LinkedIn Ads, Pinterest Ads, X Ads, and OpenAI Ads (ChatGPT Ads) via `/api/v1/ads`.
- **Analytics**: per-post and per-account engagement, reach, and follower metrics.
- **Comments & DMs**: read and reply to comments and direct messages where the platform exposes them.
- **MCP server**: the same capabilities exposed as MCP tools at `https://mcp.zernio.com/mcp`.

## Quick start

1. Sign up: https://zernio.com/signup
2. Create a profile and connect social accounts in the dashboard.
3. Create an API key and call the API:

```bash
curl -X POST https://zernio.com/api/v1/posts \
  -H "Authorization: Bearer $ZERNIO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "content": "Hello from Zernio",
    "platforms": [{ "platform": "twitter", "accountId": "ACCOUNT_ID" }],
    "scheduledFor": "2026-05-01T15:00:00.000Z"
  }'
```

## Core resources for agents

- OpenAPI 3.1 spec: https://zernio.com/openapi.yaml
- API reference (HTML): https://docs.zernio.com
- LLM-friendly API summary: https://zernio.com/llms.txt
- MCP Server Card: https://zernio.com/.well-known/mcp/server-card.json
- API catalog (RFC 9727): https://zernio.com/.well-known/api-catalog
- Agent skills index: https://zernio.com/.well-known/agent-skills/index.json
- Health: https://zernio.com/api/health
- Status: https://status.zernio.com

## Authentication

- REST API: `Authorization: Bearer <api_key>` (create keys at https://zernio.com/dashboard/api-keys).
- Third-party apps: OAuth 2.1 with PKCE. Metadata at https://zernio.com/.well-known/oauth-authorization-server.

## Pricing

Usage-based, priced per connected social account. First 2 accounts free, then $6/account for 1-10, $3/account for 11-100, $1/account for 101+ (no cap). Full machine-readable rate card (accounts, X pass-through, phone numbers, calls, SMS, WhatsApp): https://zernio.com/pricing.md

## Support

- Docs: https://docs.zernio.com
- Status page: https://status.zernio.com
- Contact: https://zernio.com/contact
- Official MCP Registry listing: com.zernio/zernio at https://registry.modelcontextprotocol.io (server card: https://zernio.com/.well-known/mcp/server-card.json)
- Claude Code plugin + agent configs (open source, includes plugin.json): https://github.com/zernio-dev/zernio-claude-plugin