Unified Messaging API One API for SMS, WhatsApp & RCS: write once, deliver everywhere.

Send across SMS, WhatsApp Business API, and RCS through a single integration. Configure channel priority, automatic fallback on undelivered, device capability checks, and DLR-driven cascades. Reach customers in 100+ countries, without stitching three vendors and three contracts.

Try For Free
One API · Automatic fallback · 100+ countries · SMS · WhatsApp · RCS · One contract · One support team
EnableX Unified Messaging API: one API for SMS, WhatsApp, and RCS
1 API three channels
100+ countries
Auto cascade RCS → WA → SMS
1 bill, 1 dashboard

Everything an omnichannel messaging programme needs

One integration. Per-recipient routing. Automatic fallback. Native rendering on each channel. One DLR schema across all of them.

Routing

Per-recipient channel selection

EnableX checks RCS capability, WhatsApp opt-in, and SMS reachability per number, routes on the channel most likely to land.

Cascade

Automatic fallback

RCS first, WhatsApp fallback, SMS guaranteed, or any cascade you define. Fallback billed once per recipient, not per attempt.

Templates

Native rendering per channel

One payload, three renders. Rich cards on RCS, templated messages on WhatsApp, plain text on SMS, no hand-crafted variants.

Webhooks

Unified DLR schema

Sent, delivered, read, replied, failed: same JSON schema across SMS, WhatsApp, and RCS. Webhook signed with HMAC, retries with backoff.

No-code

Workflow builder + broadcast portal

Marketing launches campaigns from the portal without calling the API. Engineering ships flows in code. Both feed the same engine.

Compliance

Per-channel rules built in

WhatsApp messaging tier, RCS carrier limits, SMS MNP rules, India DLT, sender-ID worldwide: we apply the right rule per channel automatically.

Built for omnichannel workloads that move money and people

BFSI, retail, healthcare, telco: the verticals where one channel is never enough.

BFSI

OTP & transaction alerts

SMS-first OTP with WhatsApp / Voice fallback to keep delivery above 98%. Statement and payment alerts on RCS for branded trust.

Read more
Retail / D2C

Marketing cascades

Carousel drops on RCS where supported, conversational WhatsApp where not, SMS fallback for the long tail. One brief, three channels.

Read more
Healthcare

Appointments & reminders

Visit reminders, lab results, refill prompts on WhatsApp, with SMS fallback for non-opted patients. HIPAA-grade controls throughout.

Read more
Telco

Renewal & recharge prompts

Branded RCS recharge cards, WhatsApp confirmations, SMS for the unreached. Operator-grade scale across APAC.

Read more
Logistics

Delivery alerts & ETA

Live ETA on RCS where capable, plain SMS where not, WhatsApp escalation for failed-delivery rebooking. Reduces RTO measurably.

Read more
Insurance

Premium & claims flows

Renewal reminders cascade across channels until paid. Claims status pushed on the channel each customer prefers.

Read more
Spotlight · Smart channel routing

RCS first if device-capable. WhatsApp fallback. SMS guaranteed.

Most "omnichannel" APIs are three SDKs in a trench coat. We built a single endpoint that decides the right channel per recipient, falls back when it has to, and bills you once per delivery, not three times for trying.

  • Per-recipient capability check: RCS reachable? WhatsApp opted-in? SMS routable? Decided in milliseconds.
  • Configurable cascade per message type: OTP starts on SMS, marketing starts on RCS, conversation starts on WhatsApp.
  • Single delivery receipt schema: sent / delivered / read / replied / failed across all channels, signed HMAC webhook.
  • One number pool, one bill, one dashboard: replace three vendor contracts with one EnableX contract.
  • Native rendering: rich cards on RCS, templated messages on WhatsApp, 160-char SMS, from one payload.
Talk to a routing specialist → See full pricing

Why EnableX Unified Messaging vs Twilio, Sinch, or Infobip

Three things the global messaging-only CPaaS players cannot match in India, SEA, and the Middle East.

01

India + APAC tier-1 routing

Direct interconnects with Jio, Airtel, Vi for India SMS and RCS. Tier-1 SMS lanes across SEA and Middle East. Beat Twilio on price and deliverability in-region.

02

On-prem & white-label

Run the platform inside your datacentre or under your brand. Required for BFSI, government, and telco resellers. Twilio is cloud-only.

03

Full-stack: + Voice + Video + AI

Add a Voice OTP fallback or a Video KYC escalation from the same account. Plus the EnableX AI Agent and AI Voice Agent for conversational layers.

Built for omnichannel messaging in
BFSI · OTPs, alerts, service updates Retail / D2C · National brands Healthcare · HIPAA-grade controls Telco · White-label CPaaS Logistics · Last-mile fleets
Pricing

Pay-as-you-use omnichannel. Cascade billed once.

Per-message rates by channel, region, and message type. Cascade fallback billed only once per delivered recipient. Volume discounts kick in automatically. Free trial credits included, no credit card required.

See full pricing → Start free trial
India SMS transactionalFrom ₹0.12
WhatsApp Business (utility)From ₹0.14
RCS basicFrom ₹0.20
Cascade fallbackBilled once

Unified Messaging API FAQs

A unified messaging API is a single integration endpoint that lets you send messages across SMS, WhatsApp Business, RCS, and Voice channels without coding against each provider separately. The EnableX Omnichannel Unified Messaging API reaches customers in 100+ countries, automatically falls back from RCS to SMS or from WhatsApp to SMS when a channel isn't available, and returns a single delivery receipt format. A no-code workflow builder and self-service broadcast portal are included for business users.

You send one API call with the recipient number and message payload; EnableX picks the best channel, delivers the message, retries with a fallback channel if needed, and returns a unified status callback. The API inspects the recipient's registered channels (WhatsApp opt-in, RCS capability, SMS reachability), applies your channel-priority rules, and routes accordingly. All traffic flows through Tier-1 carrier and Meta-partner routes, reaching customers in 100+ countries.

SMS, WhatsApp Business API, RCS Business Messaging, and Voice broadcast from a single integration. Each channel is backed by a dedicated EnableX product. The Video Call API is available from the same account for use cases that need a live video escalation such as Video KYC.

SMS works on every mobile phone globally but supports only 160 characters of plain text. WhatsApp Business API adds rich media, two-way conversations, and templates on top of WhatsApp's 2-billion-plus user base. RCS adds branded rich media (carousels, buttons, verified sender) to the native Android messaging app. Choose SMS for universal reach and OTPs, WhatsApp for conversational engagement with opted-in customers, and RCS for brand-verified rich marketing in geographies with strong Android penetration.

Channel fallback is automatic retry across messaging channels when the primary channel fails. For example, trying RCS first, then WhatsApp, then SMS if the previous attempt doesn't deliver. EnableX executes fallback based on your configured priority list, device capability checks, delivery receipt status, and timeout rules.

EnableX is a Tech partner working with multiple WhatsApp Business Solution Providers (BSP), so messages sent through the Unified Messaging API use sanctioned WhatsApp Business infrastructure and comply with Meta's Business Messaging Policy. EnableX manages phone number verification, template approvals, and quality-rating monitoring on your behalf.

Sign up for an EnableX account, generate an API key, and call the /messages REST endpoint with your payload. Most integrations go live in under 48 hours for SMS and RCS, and within a week for WhatsApp Business API after template approvals. Official SDKs are available for Node.js, Python, Java, PHP, and .NET. WhatsApp Business API requires Facebook Business Manager verification and template approval, which EnableX guides you through.

Yes. EnableX supports OTP and 2FA delivery across SMS, WhatsApp, and Voice, with automatic fallback between channels to maintain delivery rates above 98%. You can configure WhatsApp-first OTP with SMS fallback, or SMS-first with Voice OTP fallback.

Yes. EnableX includes a self-service broadcast portal plus API-level bulk sending across SMS, WhatsApp, RCS, and Voice, with rate-limit handling, scheduled delivery, and per-message tracking built in. EnableX paces the job to respect each channel's rate limits and returns a job-level report plus per-message delivery receipts.

Yes. The EnableX Dialogs Conversational AI Platform plugs directly into the Unified Messaging API, so your AI Agent can send and receive on SMS, WhatsApp, RCS, and in-app from the same workflow. The AI Voice Agent extends the same platform to voice via PSTN, IP, and WhatsApp Business Calling. Both hand off to human Live Agents with full context when needed.

Yes. Every message dispatched through the API sends a unified webhook event for each status change — sent, delivered, read, failed — regardless of underlying channel. Webhooks use signed HMAC headers for authentication, support retries with exponential backoff, and can be filtered by channel, event type, or message tag.

EnableX is often the stronger choice in India, SEA, and the Middle East because it offers on-premise and hybrid deployment, white-label for telcos, Arabic-language support on the roadmap, and direct Tier-1 carrier routes in APAC. Twilio's messaging suite is strong globally but is a pure public-cloud service and, since 2023, no longer sells a video product. EnableX keeps full-stack parity across Video, Voice, SMS, WhatsApp, RCS, and Conversational AI.

Build with Unified Messaging API: Developer Docs

Prerequisite → Unified Messaging API → Notification Webhook →

See EnableX in action.

Talk to sales, or start a free trial. No credit card required.

Try for free Talk to sales

Free trial credits · No credit card · API keys in 2 minutes