Zavu is a unified messaging API for WhatsApp, SMS, and Email, built for AI apps with predictable pricing and modern developer workflows.
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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