---
title: "Zernio: Social Media Scheduling API"
description: "Developer-first REST API and hosted MCP server to post, schedule, and analyze content across 16 platforms plus 8 ad networks."
canonical: https://zernio.com/
last-updated: 2026-10-13
---

# 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 platforms plus 8 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, 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, OpenAI Ads (ChatGPT Ads), and Reddit Ads via `/api/v1/ads`.
- **Reddit is temporarily unavailable**: Reddit has blocked third-party apps from its API, so Zernio cannot post to Reddit, read Reddit messages or sync Reddit analytics right now. Your Reddit accounts stay connected, and we will turn Reddit back on as soon as Reddit restores access. Reddit Ads is not affected.
- **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