Zavu is a unified messaging API for WhatsApp, SMS, and Email, built for AI apps with predictable pricing and modern developer workflows.
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Unified Messaging API for WhatsApp, SMS, voice, email and other channels via a single endpoint.
- for
- Developers building AI agents, notifications and multi-channel messaging applications.
- pricing
- freemium
- license
- MIT
works withTypeScriptPythonRubyGoPHPOpenAPIOpenAIAnthropicGoogleMistralTelegramInstagramMessenger
Key features
6 features of Unified Messaging API
- Single unified API — Send and receive WhatsApp, SMS, voice, email, Telegram, Instagram, Messenger and more with one integration.
- Deterministic routing — Automatic fallback routing (e.g., WhatsApp → SMS) without code changes.
- Agent-first workflow — CLI, dashboard and AI-agent driven setup for senders, numbers and functions.
- Built-in usage credit — Free plan includes $2 credit; Pro adds $20 monthly credit for SMS, voice and email.
- SDKs & OpenAPI — Typed SDKs for TypeScript, Python, Ruby, Go, PHP and a generated OpenAPI spec.
- Pay-as-you-go pricing — Transparent per-event rates for SMS, voice, email and WhatsApp templates with no markup.
Use cases
- AI customer-support agents that answer on WhatsApp, SMS, Telegram and email
- Transactional notifications such as order updates sent via the customer's preferred channel
- OTP and verification codes delivered by SMS, WhatsApp template or voice call
Unified Messaging API pricing
- Free$0/mo2,000 messages/month on WhatsApp/Telegram/Instagram/Messenger · $2 credit for SMS, voice and email · 250k memory units/month · No credit-card required
- Pro$20/mo/monthUnlimited send/receive on all channels · $20 monthly credit for SMS, voice, email · Multi-tenant support with spend limits · 2M memory units/month
Unified Messaging API vs alternatives
 Unified Messaging API |  Unified.to | .jpg1690446595296.png?width=64) Dify.AI |  Calljmp | |
|---|---|---|---|---|
| Best for | One API for all messaging channels | Unified messaging with AI agents | LLMOps platform | AI agents on managed backend |
| Pricing | Freemium | Subscription | Free | Free |
| DevHunt upvotes | 0 | 37 | 30 | 35 |
| Launched | Jan 2026 | Jan 2023 | Jan 2023 | Feb 2026 |
- Unified Messaging API vs Unified.to: Zavu adds AI-agent-first setup, deterministic routing and built-in usage credit, while Unified.to focuses on generic API integration.
- Unified Messaging API vs Dify.AI: Zavu provides a full messaging infrastructure; Dify.AI is an open-source LLMOps platform for building AI-native apps.
- Unified Messaging API vs Calljmp: Calljmp offers AI agents as code on a managed backend, whereas Zavu combines messaging channels with agent workflow and pricing credit.
Unified Messaging API FAQ
How does Zavu handle billing when the balance runs out?+
Zavu is prepaid; when the balance reaches zero API calls return a 402 error and no messages are sent until you top up.
Can I use my own LLM keys?+
Yes, you can bring your own OpenAI, Anthropic, Google or Mistral keys with no additional markup.
What channels are included in the free plan?+
The free plan includes WhatsApp, Telegram, Instagram, Messenger, SMS, voice and email with limited monthly usage.
Is there a way to test the API without purchasing numbers?+
Yes, Zavu provides its own numbers for free testing of WhatsApp, SMS and voice without a credit card.
How are WhatsApp template costs billed?+
Meta bills WhatsApp template usage directly; Zavu adds no markup and does not take a cut.
Summarized by DevHunt from zavu.dev · Sep 29, 2026. Details may change; check the official site.
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