Zernio
Zernio is a unified, white-label social media and messaging API for developers and AI agents that enables publishing, inbox/DMs, analytics, webhooks, and paid ads across 15 social platforms and multiple ad networks via one integration.
https://zernio.com/?ref=producthunt
Product Information
Updated:Jun 22, 2026
What is Zernio
Zernio provides social media infrastructure as a single REST API (plus SDKs, CLI, and an MCP server) so teams can embed social posting, messaging, engagement, and analytics into their own products without building and maintaining separate integrations for each network. It supports publishing and scheduling content, managing DMs/comments in a unified inbox, tracking performance metrics, receiving webhook events, and running/boosting ads across a broad set of channels including Instagram, TikTok, X, LinkedIn, Facebook, YouTube, Threads, Reddit, Pinterest, Bluesky, Telegram, WhatsApp, Google Business, Snapchat, and Discord. Zernio is designed to be developer-first and fully white-label, so end users don’t see Zernio branding.
Key Features of Zernio
Zernio is a unified social media and messaging API built for developers and AI agents that replaces many separate platform integrations with one REST API (plus SDKs, CLI, and a hosted MCP server). It handles OAuth-as-a-service, media formatting/optimization, rate limits, and platform API changes so teams can publish and schedule posts, manage DMs/comments/reviews in a unified inbox, pull analytics, set webhooks, and even boost posts via ads across supported networks—all without building and maintaining individual platform integrations.
One API for 15 social + messaging channels: Publish, schedule, and manage content across Instagram, TikTok, X/Twitter, Facebook, LinkedIn, YouTube, WhatsApp, Threads, Pinterest, Reddit, Bluesky, Telegram, Google Business, Snapchat, and Discord with a single integration.
OAuth-as-a-service (no per-platform dev apps): Connect accounts through a hosted OAuth flow while Zernio manages developer apps, approvals, token refresh, and platform-specific auth complexity.
Publishing + scheduling primitives: Create posts (text, images, video, carousels), schedule them, and rely on platform-aware handling like media formatting and automated retries on failures.
Unified Inbox via API: Access and reply to DMs, comments, and reviews from multiple platforms through one inbox endpoint, enabling programmatic engagement workflows.
Analytics + webhooks: Retrieve unified metrics (e.g., likes, reach, impressions, clicks, views, follower stats) and receive webhook notifications for publish/fail events to avoid polling.
AI-agent tooling (MCP server, SDKs, CLI): A hosted MCP server (280+ tools) plus official SDKs and a CLI let agents and developer tools (e.g., Claude/Cursor) operate social workflows in natural language or code.
Use Cases of Zernio
SaaS product embedding social features: Add account connection, cross-posting, scheduling, inbox, and analytics into a product without maintaining 15 separate APIs—useful for creator tools, CRM platforms, or e-commerce apps.
Marketing agencies managing many client accounts: Standardize posting, engagement, and reporting across clients and platforms with one backend integration and consistent webhooks/analytics feeds.
AI agents for social operations: Let an agent autonomously draft, schedule, publish, and engage (reply to comments/DMs) using the MCP toolset, including performance lookbacks via analytics endpoints.
Customer support via social + WhatsApp: Centralize inbound messages and reviews (including WhatsApp) into a single programmable inbox to power helpdesk automations and faster response workflows.
Multi-channel campaign execution and boosting: Coordinate organic publishing with paid promotion by boosting posts through supported ad networks, tying execution and measurement together via APIs.
Pros
Broad platform coverage with a single integration (15 channels) plus ads network support for several platforms
Developer- and agent-friendly tooling: REST API, multiple SDKs, CLI, and hosted MCP server
Reduces maintenance burden by handling OAuth, token refresh, rate limits, media formatting, and platform API changes
Usage-based per-connected-account pricing includes all features (no add-ons/tiers) and first 2 accounts are free
Cons
Per-connected-account pricing can become expensive for agencies/SaaS with many client accounts (cost scales linearly with connected accounts)
Some capabilities vary by platform (feature parity differs across channels)
X/Twitter API costs are passed through separately at cost, adding variability to total spend
How to Use Zernio
1) Create a Zernio account and get an API key: Sign up at https://zernio.com/signup, then generate an API key in the dashboard (API Keys). Keys use the format: sk_ + 64 hex characters. You’ll use it as a Bearer token for all API requests.
2) Set your API key in your environment: Export the key so SDKs/CLI can pick it up automatically: export ZERNIO_API_KEY="sk_...". Environment variables take precedence over local config.
3) (Option A) Install and authenticate with the Zernio CLI: Install the Zernio CLI (per docs), then authenticate via browser OAuth: zernio auth:login. Or set the key manually: zernio auth:set --key "sk_your-api-key". Config is stored at ~/.zernio/config.json (legacy ~/.late/config.json is supported).
4) Connect a social/messaging account via hosted OAuth: Use Zernio’s unified OAuth flow to connect platforms (Instagram, X/Twitter, LinkedIn, TikTok, WhatsApp, etc.). You’ll be redirected to the platform to authorize, then Zernio stores the connection so you can post/message via API.
5) (API) Generate a connect URL and redirect the user: Call the connect endpoint to get an OAuth URL, then redirect the user to it. Example (Node): const { url } = await zernio.connect.getConnectUrl({ path: { platform: 'twitter' }, query: { profileId: 'YOUR_PROFILE_ID' } }); Redirect the user to `url` to complete authorization.
6) Verify connected accounts: List connected accounts to get the accountId values you’ll post to. CLI example: zernio accounts:list --pretty. You’ll use returned account IDs (e.g., acc_xxx) in post payloads.
7) Publish a post immediately (REST): Send a POST request to https://zernio.com/api/v1/posts with Authorization: Bearer <API_KEY>. Include content and a platforms array with platform + accountId. Set publishNow: true to publish immediately.
8) Schedule a post for later (REST or CLI): Instead of publishNow, provide a scheduled time (e.g., scheduledFor / scheduledAt depending on client). CLI example: zernio posts:create --text "Hello from the CLI!" --accounts <accountId> --scheduledAt "2025-06-01T10:00:00Z".
9) Publish to multiple platforms in one call (SDK): Use an SDK to cross-post with one request. Node example: const { data: post } = await zernio.posts.createPost({ body: { content: 'Hello world from Zernio!', platforms: [ { platform: 'twitter', accountId: 'acc_xxx' }, { platform: 'linkedin', accountId: 'acc_yyy' }, { platform: 'instagram', accountId: 'acc_zzz' } ], publishNow: true } });
10) Customize content per platform (optional): Provide platformSpecificContent per platform entry to tailor copy while still sending one request. Example: platforms: [{ platform:'twitter', accountId:'acc_twitter', platformSpecificContent:'Short & punchy for X' }, { platform:'linkedin', accountId:'acc_linkedin', platformSpecificContent:'Professional tone for LinkedIn with more detail.' }].
11) Use the Python SDK (optional): Install and instantiate the client (reads ZERNIO_API_KEY). Example: from zernio import Zernio; client = Zernio(); post = client.posts.create(content='Hello world from Zernio!', platforms=[{'platform':'twitter','accountId':'acc_xxx'}], publish_now=True).
12) Use the MCP server with AI agents (optional): Connect Zernio’s hosted MCP server to an MCP-capable client (Claude, Cursor, ChatGPT, etc.) so an agent can call Zernio tools (posting, inbox, automations) using natural language. Verify any tier/access requirements in the MCP docs.
13) Set up webhooks for delivery status (recommended): Configure webhook settings so Zernio notifies you when posts publish or fail (with reasons), avoiding polling. See the webhook settings endpoint in the docs.
14) Troubleshoot authentication and legacy settings: Ensure requests include Authorization: Bearer <key>. If using CLI, confirm ~/.zernio/config.json exists and run zernio auth:check. Legacy env vars (LATE_API_KEY / LATE_API_URL) and ~/.late/config.json may still work as fallbacks.
Zernio FAQs
Zernio is an API-first social media scheduling, messaging, analytics, and ads platform that lets developers publish, message, promote, and analyze across 15 social channels from a single API.
Popular Articles
Atoms: A Multi-Agent AI Platform That Transforms Ideas into Launch-Ready Products
May 22, 2026
Nano Banana SBTI: What It Is, How It Works, and How to Use It in 2026
Apr 15, 2026
Atoms Review — The AI Product Builder Redefining Digital Creation in 2026
Apr 10, 2026
Kilo Claw: How to Deploy and Use a True "Do‑It‑For‑You" AI Agent(2026 Update)
Apr 3, 2026
Latest AI Tools Similar to Zernio
AIFluencerPro
AIFluencerPro is an AI-powered platform that allows users to create photorealistic AI influencers and generate high-quality AI images in minutes using advanced generative AI technology.
Lynklet
Lynklet is an all-in-one social tool platform that combines bio link pages, URL shortening, QR code generation, digital business cards, and file hosting capabilities in one comprehensive solution.
Re-Engage
Re-Engage is an innovative content repurposing tool that transforms YouTube videos, articles, newsletters, and documents into high-performing social media content optimized for Twitter and LinkedIn virality.
Trump Donald
Trump Donald is a unique political fundraising platform that lets users send physical letters to Mar-a-Lago while making donations to organizations working to defeat Donald Trump.
Popular AI Tools Like Zernio
AI Reply Generator - social24
AI Reply Generator - Social24 is a browser extension that helps users generate smart, personalized AI replies for multiple social media platforms including Instagram, Facebook, TikTok, YouTube, and LinkedIn with custom prompt templates and seamless integration.
Read & Give by Bono
Read & Give by Bono is a Chrome extension that uses AI to analyze news content and suggests relevant charitable donation opportunities based on the articles you read.
Pigeon
Pigeon is a lightweight Chrome extension that helps users discover and analyze real user opinions from Reddit discussions about any webpage they're browsing.
Famefy
Famefy is an AI-powered live streaming platform that lets users experience virtual stardom by interacting with AI-generated fans who provide real-time engagement and feedback.