Zernio

Social media API for AI agents and developers

5.0•2 reviews•

770 followers

Social media API for AI agents and developers

5.0•2 reviews•

770 followers

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Marketing automation platforms

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Unified API

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No-Code AI Agent Builder

Build social media & messaging features at scale. Zernio provides a single API for publishing, inbox, analytics, ads, and account management across 15 platforms, so you can ship product instead of wasting time with platform APIs.

This is the 3rd launch from Zernio. View more

Zernio WhatsApp API

Launching today

One API for WhatsApp: messaging, calling, and AI agents

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.

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Launch tags:Messaging•API•Developer Tools

Launch Team

Checkmarx Next Generation SASTHighest Fidelity F1 Score Hybrid Engine, Language Agnostic

Promoted

Zernio

Maker

📌

Hey Product Hunt! I’m Miki, founder of Zernio :)

We built Zernio as a social media API. One integration, 10+ platforms, and developers could ship social features without spending months on OAuth flows and platform-specific quirks. That part worked.

But we kept getting the same question: what about WhatsApp?

Not “can you send a message”, but the whole thing. Numbers, broadcasts, calling, in-chat forms, group chats, AI agents. People were building real products on WhatsApp and the existing options were either expensive BSPs with markups on every message, or raw Meta APIs that take weeks to months to set up.

So we built it properly.

Connect a number, get the entire WhatsApp Business API behind it. Same Zernio integration developers already know. Zero markup on usage, you pay exactly what Meta charges per message sent, and Zernio monthly subscription. REST, SDKs, CLI, and a hosted MCP server if you’re building with AI agents.

We’re 7 people in Spain. Bootstrapped. We’ve been shipping one WhatsApp feature a day this week and today felt like the right moment to bring it to Product Hunt.

We’ll be in the comments all day. Happy to go deep on anything, like how number provisioning works inside Zernio, how to manage templates, or how the pricing compares to Twilio, whatever you’re curious about 🤝

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1d ago

PicWish

@paletmiki nice launch guys! how does zernio's hosted mcp server setup compare to running a custom adapter when hooking this up to an ai agent workflow?

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21h ago

Zernio

Maker

@mohsinproduct The advantage of our MCP is that it's 0 setup, but you can always build one yourself if you want more control :)

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20h ago

@paletmiki The easiest way to connect to all the platforms by far!!! This team rocks 🚀🤘

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21h ago

Zernio

Maker

@david_alarcon1 thank you, means a lot!

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20h ago

the "zero markup on usage" line got me. dealing with Twilio's WhatsApp pricing on top of Meta's fees was killing margins on a project last year. having messaging, calls, and AI agent routing all in one integration without the markup games is exactly what i would've wanted. the MCP server being hosted is a nice touch for agent workflows too. curious how you're handling rate limits when multiple AI agents are hitting the same number concurrently?

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14h ago

Zernio

Maker

@rnagulapalle thank you! we handle everything from our side so rate limits don't bite you

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14h ago

@paletmiki nice And maybe will give a try this week … good product and happy to see a devtool like this today for social graph

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14h ago

WhatsApp is such an important channel for SMB workflows because it mixes support, sales, reminders, and relationship management in one place. The MCP angle is interesting. How do you think about guardrails for AI agents using WhatsApp: template approvals, human handoff, and preventing an agent from over-messaging a customer?

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17h ago

Zernio

Maker

@rahulbhavsar great question! A few guardrails are built in by default: template approvals required outside the 24h window (Meta's own anti-spam layer), and a native Handoff node to transfer to a human at any point. Over-messaging is harder to solve at infra level, but the builders using Zernio tend to care about this. Nobody building a serious product wants to spam their customers.

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16h ago

That makes sense. Meta’s template approval plus a native human handoff already covers two of the biggest risk areas: consent/compliance and escalation.

I agree over-messaging is harder because it is partly a product and operator problem, not just infrastructure. One useful layer might be campaign-level limits or intent-based throttling, so teams can define when automation should slow down even if the API technically allows another message. That kind of guardrail would make WhatsApp automation feel much more trustworthy for serious B2B use cases.

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13h ago

One of the most interesting launches today! And a good call on the whatsapp calling angle as this is the part nobody else is really shipping. QQ - how are you guys handling the 24h customer service window? I trust once it closes an agent cant reopen the thread without an approved template. Does the MCP surface that state back to the agent?

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18h ago

Zernio

Maker

@artstavenka1 That's right! Only templates after 24 hours. We surface this

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18h ago

Zernio

Maker

@artstavenka1 thank you and a great question! Zernio treats the WhatsApp 24‑hour window the same way Meta does: within that window you can send any messages; outside it you must use an approved template.

on MCP: the agent has access to full conversation history and timestamps via the Inbox API, so it can calculate whether the window is still open. There's also a message.failed webhook with the Cloud API error code if a free-form message gets rejected, so agents can catch it reactively too.

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18h ago

Cutsio

Is any meta account linking required for these WhatsApp numbers? AFAIK, meta is really aggressive with marking things spam and with recent mass Instagram accounts banning fiasco, more so

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19h ago

Zernio

Maker

@rish404 Great question Rish! Yes, Meta Business account is required - you go through Meta's Embedded Signup to connect your WABA. But Zernio makes it quick: you can get a new number provisioned through Zernio or bring your own.

On the spam concern: since it's the official WhatsApp Business API, Meta's own quality controls apply. no risk!

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19h ago

@paletmiki WhatsApp is a strong surface for agents because it is already where a lot of real customer conversations happen. The important part is making the API reliable enough for handoffs, approvals, and context history — not just sending and receiving messages.

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19h ago

Zernio

Maker

@alpertayfurr exactly! and handoffs, webhooks to a system, and context history are all part of workflows now 🙌

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18h ago

The calling + AI agents combo in a single API is what makes this stand out - most WhatsApp integrations I've looked at just cover messaging. Been thinking about building something that handles voice callbacks automatically and the current options are painful. Question for the team: how does the rate limiting work when you're running outbound AI agent campaigns at scale? That's usually where these tools hit unexpected ceilings.

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15h ago

Zernio

Maker

@galdayan great question! Rate limits come from Meta's tier system, not Zernio. You start at 250 unique contacts/day (if you're a new account) and scale up automatically based on volume and quality history, with no hard cap once you're in higher tiers.

For calling specifically: outbound requires your number to be at the 2,000/day messaging tier. Also worth knowing that outbound calls are blocked by Meta for US, Canada, and a few other markets (inbound still works). So for voice callback campaigns at scale, a non-US number is the way to go. While the AI agent side is connected to Zernio separately and its rate depends on the provider you use.

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14h ago

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