Zernio WhatsApp API

In plain words

Zernio WhatsApp API provides developers with a single integration to access WhatsApp Business capabilities including messaging, broadcasts, in-chat forms, and voice calls that route to AI agents or chatbots. Supporting numbers in 53 countries, it offers REST APIs, SDKs, CLI tools, and a hosted MCP server for building WhatsApp applications. The service includes group chat functionality and charges zero markup on usage costs.

written from the facts on this page · September 2026

From the sources

You knew Zernio as the API for social media. Now it does WhatsApp too, the whole thing. Connect a number and you've got the entire WhatsApp Business API behind it: messaging and broadcasts, in-chat forms, calls you can route to AI agents, chatbots, group chats, and numbers in 53 countries. Whatever you need to build on WhatsApp, it's one integration. Made for developers and the agents they build: REST, SDKs, CLI, and a hosted MCP server. Official WhatsApp Business API. Zero markup on usage.

One REST API for WhatsApp Business. Messaging, broadcasts, calling, and ads through one bearer token. No Meta developer app, free tier available.

Hi Mark, for the next 24 hours only, all winter jackets are 50% off. One REST API for WhatsApp Business. Messaging, broadcasts, calling, and ads through one bearer token. No Meta Business verification process. Start sending in 30 seconds The 24h window, rate limits, messaging tiers. You just call POST New accounts start at 250 messages a day. Upgrades are on you Bring your existing phone number. Requires verification during setup. Bring a number you already have or buy one in Zernio. Embedded Signup verifies it, and you're set with full API access. One POST request sends templates, media, voice notes, or interactive messages the same simple way every time. Replies land in a shared inbox for…from zernio.com

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  ZernioMar 2026 · zernio.com · ▲60

  Hey HN, I'm Pau. We've been building Zernio for the past 9 months and we just crossed $1M in ARR (bootstrapped). Zernio is a unified API for social platforms. One API for Instagram, TikTok, YouTube, LinkedIn, X, and 9 others. Today we're adding WhatsApp. We've spent 3 weeks just getting a test message to send. Meta requires a developer app, a WhatsApp Business Account inside Business Manager, business verification (2-14 days), phone number OTP, webhook configuration with a two-step subscription, and token management for tokens that die every 60 days. Miss one step and messages vanish with no…

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