# Social Media Posting API for Developers

Zernio's social media posting API lets you publish, schedule, and manage content across 15 platforms. Replace months of integration work with a single endpoint.

## Key Features

### Unified Multi-Platform API

One JSON payload for all platforms. We normalize media formats, character limits, and content types.

### Post Scheduling & Queues

Schedule with timezone support. Set up recurring queues or bulk-upload via CSV.

### Images, Videos & Carousels

Upload images, videos, carousels, Stories, and Reels. Auto-validation and resizing included.

### Cross-Platform Analytics

Unified engagement metrics across all platforms via a single endpoint.

### Simple API Key Auth

Bearer token auth. No OAuth complexity. Connect accounts once, reference by ID.

### Webhooks & Events

Real-time notifications for post status changes and new analytics data.

### Unlimited Social Accounts

Connect multiple accounts per platform. Each gets a unique ID for granular control.

### n8n, Make & Zapier Ready

Official n8n node plus webhook support for Make and Zapier workflows.

### First Comment Support

Auto-add first comments on Instagram, Facebook, LinkedIn, and YouTube.

## How It Works

1. **Get Your API Key**  
   Sign up free, generate a key from the dashboard. 20 posts/month included.

2. **Connect Social Accounts**  
   Link accounts via OAuth. Each gets a unique ID for API calls.

3. **Start Posting**  
   One API call to publish across all platforms. Ship your first post in under 15 minutes.

## Why Developers Choose Zernio

### Skip Months of Integration Work

One API replaces Instagram Graph, TikTok Content Posting, X v2, LinkedIn Marketing, and more.

### Enterprise-Grade Reliability

99.7% uptime SLA. Automatic retries, rate-limit management, and graceful error handling.

### Scales with You

20 free posts/month to unlimited. No code changes needed as you grow.

### Great Developer Experience

Code examples in Python, Node.js, cURL. Detailed error messages. 15-minute setup.

### Transparent Pricing

Free tier with real API access. Paid plans from $19/mo (vs $60+ for alternatives).

### Always Up-to-Date

We monitor all platform APIs and update integrations automatically. Your code never breaks.

## How Much Does a Social Media Posting API Cost?

Building and maintaining 15 platform integrations in-house takes 6+ months of engineering time. Using a native platform API means managing separate auth, rate limits, and media specs for each one. Here’s how Zernio compares.

| Approach                        | Monthly cost                   | What you get                            |
|---------------------------------|--------------------------------|------------------------------------------|
| Build in-house (14 APIs)       | $10,000–$30,000+ in eng time  | Full control, full maintenance burden   |
| X API (Basic tier)             | $100/mo                       | X/Twitter only, 3,000 tweets/mo         |
| Meta Graph API                  | Free (approval required)      | Instagram + Facebook only               |
| Zernio (Build)                  | $19/mo                       | 15 platforms, 120 posts, API key auth  |
| Zernio (Accelerate)            | $49/mo                       | 15 platforms, unlimited posts            |

\* Zernio Free tier: 20 posts/month with full API access. No credit card required.

## Code Examples

**Schedule a Post (cURL)**

```bash
curl -X POST https://zernio.com/api/v1/posts \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{\
    "content": "Hello from Zernio API!",\
    "scheduledFor": "2026-03-15T10:00:00Z",\
    "timezone": "America/New_York",\
    "platforms": [\
      {"platform": "twitter", "accountId": "acc_123"},\
      {"platform": "linkedin", "accountId": "acc_456"},\
      {"platform": "instagram", "accountId": "acc_789"}\
    ]\
  }'
```

**Schedule a Post (Python)**

```python
import requests

response = requests.post(
    "https://zernio.com/api/v1/posts",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={
        "content": "Automated post from Python",
        "scheduledFor": "2026-03-15T10:00:00Z",
        "platforms": [\
            {"platform": "twitter", "accountId": "acc_123"},\
            {"platform": "linkedin", "accountId": "acc_456"}\
        ]
    }
)
print(response.json())
```

**Schedule a Post (Node.js)**

```javascript
const response = await fetch("https://zernio.com/api/v1/posts", {
  method: "POST",
  headers: {
    "Authorization": "Bearer YOUR_API_KEY",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    content: "Posted from Node.js!",
    scheduledFor: "2026-03-15T10:00:00Z",
    platforms: [\
      { platform: "twitter", accountId: "acc_123" },\
      { platform: "instagram", accountId: "acc_789" }\
    ]
  })
});
console.log(await response.json());
```

**Get Post Analytics (cURL)**

```bash
curl -X GET https://zernio.com/api/v1/analytics/post_abc \
  -H "Authorization: Bearer YOUR_API_KEY"

# Response:
# {
#   "postId": "post_abc",
#   "platforms": {
#     "twitter": { "likes": 42, "retweets": 12, "impressions": 1580 },
#     "linkedin": { "likes": 67, "comments": 8, "impressions": 3200 }
#   }
# }
```

## Supported Platforms

Post to all 15 major platforms from one API.

## Frequently Asked Questions

**What is a social media posting API?**  
A social media posting API is a REST interface that lets developers publish content to social platforms programmatically. Instead of building separate integrations, a unified posting API like Zernio handles auth, media formatting, and rate limits across 15 platforms with one endpoint.

**How many platforms does Zernio's posting API support?**  
15 platforms: Instagram, TikTok, X/Twitter, Facebook, LinkedIn, YouTube, WhatsApp, Threads, Pinterest, Reddit, Bluesky, Telegram, Google Business, Snapchat, and Discord.

**Is there a free tier for the social media posting API?**  
Yes. Zernio's free plan includes 20 posts/month with full API access, and 2 social sets. Paid plans start at $19/month.

**How long does it take to integrate?**  
Most developers ship their first post in under 5 minutes. Sign up, generate an API key, and make a single POST request. No platform developer apps or OAuth setup required on your end.

**What media types are supported?**  
Images (JPEG, PNG, GIF, WebP), videos (MP4, MOV), carousels, Stories, and Reels. Upload directly or provide a public URL.

**Can I use Zernio with n8n or Make?**  
Yes. Official n8n community node with pre-built actions. For Make and Zapier, use webhook endpoints to trigger workflows.

**Can AI agents use Zernio to post on social media?**  
Yes. Zernio ships an MCP server with 280+ tools that works with Claude Desktop, Cursor, and any MCP-compatible client. Your agent can post, schedule, and manage content via natural language.