Ship messaging as a feature, not a project.
Add verified, branded messaging to your product without building carrier infrastructure. Transactional notifications, onboarding flows, verification codes, and lifecycle updates, delivered over RCS with automatic SMS fallback, through one API. The messaging layer your roadmap needs, without the multi-quarter detour.
- One API
- Transactional & lifecycle
- Verified branding
- SMS fallback
- Compliance handled
curl https://simplyrcs.signalmash.com/v1/messages \ -H "Authorization: Bearer $SIMPLYRCS_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "to": "+14155550142", "sender": "your-brand", "content": { "text": "Your code is 481-902, it expires in 10 minutes.", "buttons": [ { "label": "Verify", "action": "open_url", "url": "https://yourapp.com/verify" } ] }, "fallback": "sms" }'Messaging is on every roadmap and nobody wants to build it.
Your users expect messaging: order confirmations, verification codes, status updates, re-engagement nudges. But building it properly is a quarter you don’t have. All the carrier infrastructure underneath is not your product’s core value, and getting any of it wrong means messages that don’t deliver or compliance you can’t defend.
- 1Carrier integrationsbuild + maintain
- 210DLC and brand registrationbuild + maintain
- 3RCS sender verificationbuild + maintain
- 4Fallback logicbuild + maintain
- 5Delivery trackingbuild + maintain
- 6Opt-out compliancebuild + maintain
- 7Carrier relationship managementbuild + maintain
The messaging layer, handled.
Everything a product team needs from a messaging layer, without building any of it.
One API, every channel
Send RCS, SMS, and MMS through a single REST API with automatic fallback, no per-carrier integrations, no separate SMS and RCS systems to maintain.
Messaging across the product lifecycle.
The messages that make a product feel responsive, trustworthy, and alive.
Verification & 2FA
Branded one-time passcodes and login verification that users trust, delivered fast with guaranteed fallback.
Wire it in once. Trigger anything.
Integration is event-in, event-out. Your product fires an event, order placed, login attempted, subscription lapsing, and a single API call sends the right branded message with fallback handled. Signed webhooks stream delivery, read, and reply events back into your systems, so messaging participates in your product state and your data stays in sync.
- Event-driven sends: one API call per event; capability detection and fallback handled
- Real-time webhooks: delivery, read, and inbound events stream back, signed and verifiable
- Canvas or headless: design flows visually and trigger by API, or build entirely in code
- MCP for agents: let AI agents in your product send and react through tool calls
NimbusTransactionalOrder #4471 confirmed. Arriving Thursday, we’ll text you when it ships.
message.deliveredmessage.readProduct messages users trust and act on.
Product messaging has historically meant anonymous SMS: a verification code from an unknown short code, an order update users aren’t sure is real. RCS makes your product’s messages verified (so users trust a code or alert is genuinely yours), interactive (so a status update has a Track button, a verification has an it-wasn’t-me action), and measurable (so you see delivery and engagement on critical flows). Automatic fallback guarantees the message arrives even where RCS isn’t supported, essential for transactional messaging.
Trusted, so it is acted on
Verified branding tells users a code or alert is really from your product, critical for verification, security, and anything that depends on the user believing the message.
Interactive, so it is useful
A status update with a Track button, a verification with a one-tap "it wasn’t me", actions in the message itself make your product feel responsive, not just notifying.
Guaranteed, so it always lands
Transactional messages must arrive. Automatic fallback to SMS means a verification code or critical alert is never stuck behind an unsupported device.
NimbusTransactionalInfrastructure you can put in the critical path.
If messaging is in your verification or transaction flow, it has to be reliable. SimplyRCS runs on direct Tier-1 carrier connections with automatic fallback, signed webhooks for verifiable events, scoped API keys, and SOC 2 Type II controls, and compliance keywords are enforced at the platform level, so a code path in your product can’t accidentally override a user’s opt-out. Dependable enough to sit in the critical path.
Direct carrier connections
Tier-1 routes with automatic fallback, so every message takes the fastest format the device supports and still lands when RCS is not available.
Product team questions.
What is transactional messaging?
Transactional messaging is automated, event-triggered messages tied to a user’s activity: order confirmations, verification codes, status updates, receipts, and alerts, as opposed to broadcast marketing. With SimplyRCS, transactional messages send over verified RCS with one-tap actions and fall back to SMS automatically, so time-sensitive messages always arrive.
How do product teams add messaging to a product?
Product teams add messaging by integrating a messaging platform API rather than building carrier infrastructure themselves. With SimplyRCS, you fire an event to one REST API and it sends the right branded message with fallback, while signed webhooks stream delivery and reply events back, so messaging wires into your product state without months of carrier, registration, and compliance work.
Do I need to build carrier infrastructure to send RCS and SMS?
No. SimplyRCS provides the carrier infrastructure: direct Tier-1 connections, 10DLC and brand registration, RCS sender verification, fallback, and opt-out compliance, behind one API. Your team calls the API; the platform handles everything underneath, so you ship messaging as a feature instead of building infrastructure.
Can I trigger messages from my product events?
Yes. SimplyRCS is event-driven: fire an event from your product and a single API call sends the corresponding branded message with automatic fallback. Signed webhooks stream delivery, read, and inbound events back to your systems in real time, keeping messaging in sync with your product state.
Is messaging reliable enough for verification and transactional flows?
Yes. SimplyRCS runs on direct Tier-1 carrier connections with automatic fallback to SMS, so verification codes and critical notifications arrive even on devices that cannot receive RCS. Signed webhooks, scoped API keys, and SOC 2 Type II controls make it dependable enough for the critical path, and opt-out compliance is enforced at the platform level.
Can both developers and non-developers build with it?
Yes. Developers build via the REST API and MCP server; product managers and ops can build flows on the no-code canvas. It is the same platform and the same data, so teams collaborate however they work: engineering wires in the triggers, product designs the flows.
Does it work on iPhone and Android?
Yes. Branded RCS messages reach iPhones (iOS 18.1+) and Androids (Google Messages), and SimplyRCS falls back to SMS automatically on any device that cannot receive RCS, so every user gets every transactional and lifecycle message.
Add the messaging layer without the messaging project.
Book a technical demo and we’ll show how your product’s events become branded messages, live, with webhooks streaming back. Or get an API key and send your first message in minutes.