One API. No carrier headaches.
Send verified RCS, SMS, and MMS through a single REST endpoint, with an MCP server, signed webhooks, and full parity between the API and the app. We run the carriers, registration, verification, fallback, and compliance. You ship messaging without the multi-quarter infrastructure detour.
- REST + MCP
- Signed webhooks
- OpenAPI 3
- Full parity
- Same price as the app
“Just add texting” is never just adding texting.
On paper it’s one feature. In practice it’s a stack of carrier systems, none of which is your product, all of which you would own forever. And that’s before you discover RCS and SMS are two different systems you now maintain in parallel.
- 1Carrier integrationsbuild + maintain
- 210DLC brand registrationbuild + maintain
- 3RCS agent verificationbuild + maintain
- 4Capability detectionbuild + maintain
- 5Fallback logicbuild + maintain
- 6Delivery receiptsbuild + maintain
- 7Retries and idempotencybuild + maintain
- 8Opt-out compliancebuild + maintain
A messaging API that respects your time.
The things that actually matter when you’re the one integrating it.
Fast time to first message
Scoped key, one POST to /v1/messages, done. Real curl and copy-pasteable examples, not a sales call before you can send.
Not an API you pay extra to escape.
With most providers, the API is a tier, or the only thing, and you rebuild the dashboard, the bot logic, the analytics, and the compliance yourself. SimplyRCS gives you both, at one price: a full REST API and a complete platform that share the same data and senders.
- API included, no developer tier or per-call upcharge
- Shared state: build in the canvas, trigger by API
- No rebuild tax: dashboard, analytics, and compliance already exist
- Carrier-rate pricing, pass-through fees itemized at cost
From a verification code to an agentic workflow.
A few of the things developers ship on SimplyRCS, with the docs to start.
Transactional & verification
Branded OTPs, confirmations, and alerts that deliver fast with guaranteed fallback, drop-in for product flows.
The boxes you’d check before building on anything.
Before you put a dependency in your critical path, you check the fundamentals. SimplyRCS runs on direct Tier-1 carrier connections with automatic fallback, signs every webhook so you can verify it, scopes API keys to read, write, and admin with rotation and revocation, handles retries with backoff and idempotency keys, and holds SOC 2 Type II. Compliance is enforced at the platform layer, so it can’t be bypassed by application code. Dependable enough to build on.
Reliable delivery, not best-effort. Direct Tier-1 routes with automatic fallback to the format each device supports.
Developer questions.
Why build on a managed RCS API instead of integrating carriers directly?
Building RCS directly means owning carrier integrations, 10DLC and brand registration, RCS agent verification, capability detection, fallback, delivery handling, and opt-out compliance, and maintaining RCS and SMS as separate systems. A managed API like SimplyRCS provides all of that behind one endpoint, so you ship messaging as a feature instead of standing up and maintaining infrastructure.
What makes a good messaging API for developers?
Fast time to first message, full parity between API and product (no UI-only features), real-time signed webhooks, clear OpenAPI docs with copy-pasteable examples, automatic fallback, and compliance you cannot accidentally bypass. SimplyRCS provides all of these, plus an MCP server for AI agents, billed at carrier rates with the API included.
Is the SimplyRCS API included or a separate tier?
Included. There is no developer tier or per-call upcharge; the same platform powers the app and the API, sharing data and senders. You pay usage-based messaging at carrier rates plus a flat $250/month per verified RCS Agent, the same as using the app.
Does SimplyRCS have an MCP server?
Yes. SimplyRCS ships a Model Context Protocol server so AI agents can send messages, build and trigger bots, and read analytics through standard tool calls, with the same scoped-key auth and platform-level compliance as the REST API. It is the messaging layer for agentic products.
Do I have to build SMS fallback myself?
No. SimplyRCS detects each recipient device capability and automatically routes to RCS, MMS, or SMS. You send one request with the RCS payload and a fallback, and the platform handles selection and delivery. There is no separate SMS integration to build or maintain.
How do I handle delivery status and inbound replies?
Use signed webhooks. Register a callback and subscribe to delivery, read, tap, and inbound events; each payload is signed so you can verify it, and retries with backoff mean a brief outage will not lose events. Webhooks are recommended over polling the API for status.
Can I generate a client from an OpenAPI spec?
Yes. Browse the OpenAPI 3 reference inline, or download the machine-readable spec to generate a typed client in your language or import into Postman. Standard REST and JSON throughout.
Skip the infrastructure. Ship the feature.
Get a scoped API key and send your first RCS message in minutes, or read the docs first. The carriers, compliance, and fallback are handled; you write the request.