Zernio WhatsApp API

Key Features

• •WhatsApp Phone Number Purchase: Buy a WhatsApp number in 54 countries via one API call. Zernio handles all regulatory paperwork and KYC, so the number is live in minutes. Includes inbound and outbound messaging, calling, and a unified inbox for conversations.
• •Social Media Posting: Use the POST/posts endpoint to publish text, images, videos, or carousels to 15 platforms simultaneously. One call reaches Instagram, TikTok, LinkedIn, Facebook, Twitter/X, YouTube, Threads, Reddit, Pinterest, Bluesky, Snapchat, Google Business, and more.
• •Ad Boost: Turn any post into a paid ad across six ad networks (Meta Ads, Google Ads, LinkedIn Ads, TikTok Ads, Pinterest Ads, X Ads) using a single endpoint. Simplify multi-platform advertising without managing multiple ad platforms.
• •Unified Inbox: Aggregate DMs, comments, and reviews from all connected channels through one API endpoint. Reply to any conversation programmatically, centralizing customer engagement and support workflows.
• •Analytics & Webhooks: Get unified metrics (likes, reach, impressions, clicks, views) across all platforms via GET/analytics. Webhooks notify you of post success or failure, eliminating polling and enabling event-driven automation.
• •MCP Server for AI Agents: Zernio ships an MCP server with 280+ tools. Point Claude, Cursor, or any MCP client at it, and your AI agent can post, run ads, and manage DMs using plain language, no custom coding required.
• •Hosted OAuth: Connect social accounts, WhatsApp numbers, and ad accounts via hosted OAuth without creating developer apps for each platform. Zernio handles developer apps, approvals, and quota limits, saving weeks of setup time.

Use Cases

• •SaaS WhatsApp Inbox: A coaching app integrates Zernio's API to manage client WhatsApp conversations directly within their application. Developers get a clean SDK and can handle inbound/outbound messages, bookings, and notifications without building a WhatsApp integration from scratch.
• •Multi-Platform Marketing: A marketing agency uses Zernio to publish content to 15 social channels simultaneously from their platform. One API call distributes posts, and the same endpoint can boost top-performing posts as ads, streamlining the agency's workflow.
• •AI Agent Social Management: A developer connects Zernio's MCP server to Claude Copilot. The AI agent can now post updates, respond to DMs, and run ad campaigns using natural language commands, automating social media tasks without manual intervention.
• •Unified Customer Engagement: A brand with presence on multiple social platforms uses Zernio's unified inbox to aggregate all customer messages, comments, and reviews. Their support team replies programmatically via the API, ensuring no query is missed and response times improve.
• •Programmatic Ad Campaigns: An ad-attribution SaaS uses Zernio to boost posts across six ad networks from their dashboard. They track unified analytics to measure performance, automate budget adjustments, and scale campaigns without managing each ad platform individually.

Who is this for?

Zernio is built for developers and engineering teams who need to integrate social media, messaging, and advertising capabilities into their applications or AI agents. It is ideal for SaaS founders looking to ship communication features quickly without building and maintaining custom integrations for each platform. AI agent developers who want to give their agents the ability to post, message, and run ads using natural language will find the MCP server valuable. Additionally, marketing technology providers, customer engagement platforms, and agencies that manage multiple client accounts across social channels can benefit from the unified API. The platform is also suitable for startups and established companies that prioritize compliance, as Zernio is SOC 2 and GDPR certified and holds official partnerships with Meta, TikTok, LinkedIn, Pinterest, and X.