What is an RCS API?
An RCS API is a software interface that enables businesses to send, receive, manage, and measure RCS Business Messages through connected applications. It allows RCS to connect with systems such as CRMs, ecommerce platforms, contact centres, chatbots, payment systems, and marketing tools.
The API provides the technical foundation for automated RCS communication.
What can an RCS API do?
Depending on the provider and implementation, an RCS API can help businesses:
- Send text messages
- Send Rich Cards
- Send Carousels
- Add Suggested Replies
- Add Suggested Actions
- Receive customer messages
- Receive delivery events
- Track read receipts
- Capture button interactions
- Manage RCS Agents
- Support SMS fallback
- Connect conversations to business systems
For example, an ecommerce system can use an RCS API to send an order confirmation, receive a customer’s “Track Order” response, and return live shipment information through an automated workflow.
Businesses evaluating RCS should first understand RCS for Business, including Agents, verification, content types, and platform availability.
How does an RCS API work?
A business application sends an API request to an RCS provider or platform. The request includes the recipient, message type, content, media, actions, and other required information.
The provider sends the message through the appropriate RCS network. Delivery, read, reply, and interaction events are returned to the business through webhooks or another event mechanism.
A simple architecture may include:
text
CRM or business system ↓RCS API or messaging platform ↓RCS Agent and carrier network ↓Customer messaging application ↓Webhook events and analytics
RCS API versus SMS API
An SMS API generally sends plain-text messages and may support basic delivery receipts. An RCS API supports richer message structures and interactive experiences.
RCS API | SMS API |
|---|---|
Rich cards and media | Plain text |
Buttons and replies | Limited interaction |
Branded Agent | Sender ID or number |
Read and interaction data | Usually delivery data |
Capability and fallback logic | Broad device compatibility |
More complex message design | Simpler implementation |
What should businesses evaluate?
When choosing an RCS API provider, assess:
- Market and carrier coverage
- RCS Agent registration
- Brand verification support
- Rich content support
- API documentation
- Webhook reliability
- Delivery and interaction analytics
- SMS fallback
- Security controls
- CRM and ecommerce integrations
- Support and service levels
- Pricing model
Businesses should also ask how the provider handles unsupported devices, message errors, Agent approval, media hosting, and campaign reporting.
Developer considerations
Developers should plan:
- Authentication
- Request validation
- Rate control
- Webhook security
- Idempotency
- Retry handling
- Media management
- Delivery-status processing
- Fallback logic
- Consent and opt-out management
- Data retention
An RCS API is not only a message-sending tool. It becomes part of the customer’s business workflow and should be designed for reliability.
Frequently asked questions
Can an RCS API connect to a CRM?
Yes. It can connect to a CRM through direct integration, middleware, or a customer-engagement platform.
Does an RCS API guarantee RCS delivery?
No. Delivery depends on the recipient’s device, carrier, market, network, eligibility, and message configuration.
Can an RCS API send SMS fallback?
Many providers support fallback, but availability and behaviour depend on the platform and market.
Is RCS API the same as RBM API?
The terms are often used interchangeably in business messaging. The exact naming depends on the provider and current Google terminology.