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Sinch lets apps and websites send and receive SMS through a hosted API. To get started, create a Sinch Build Dashboard account, obtain a service plan ID and API token, test with the virtual number provided for new accounts, then connect your app using Sinch’s REST API or an SDK. Costs are usage-based, but there is no single worldwide “low-cost” rate: destination, routing, carrier fees, number charges and taxes affect the bill.
What Sinch’s SMS integration does
Sinch’s SMS API is a software service: your app or website makes requests to Sinch rather than connecting directly to a physical messaging device. Its REST API supports sending messages to one recipient or in batches, receiving inbound SMS, grouping, callbacks and delivery reports. Developers can also use Sinch SMS SDKs or the SMS channel in its Conversation API. See the SMS overview and API reference.
MMS availability is narrower: Sinch documents it for the US region, subject to account enablement. Confirm availability for your account and use case before designing around it.
What you need before integrating
- A Sinch Build Dashboard account.
- A service plan ID and API token from the dashboard.
- A destination number for testing. Sinch’s getting-started guide says new accounts receive a free virtual number for testing; production may require purchasing additional numbers.
- A decision about the API region, message types, traffic volume and whether you need inbound replies or delivery callbacks.
The Sinch SMS getting-started guide covers account setup and initial credentials. Treat the testing number as a way to validate integration, not as proof that production numbers, registration or traffic are included at no cost.
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Set up the integration
- Create your account: Sign up for the Sinch Build Dashboard and locate your SMS service plan ID and API token.
- Choose REST or an SDK: Use the REST API for direct HTTP integration, or select a Sinch SMS SDK if it fits your application stack. The documentation also describes sending SMS through the Conversation API when you need its multi-channel approach.
- Set the API region: Sinch lists the US as the default environment and documents production locations in the US, Ireland/Sweden (EU), Australia, Brazil and Canada. Confirm the correct endpoint and any data-location requirements for your account; Sinch says to contact an account manager about other geographic API setups.
- Authenticate requests: Include the API token as a bearer token in the HTTP
Authorizationheader. Keep the token on your server or in a secure secrets store rather than exposing it in client-side website code. Consult the API reference for the endpoint and request format for your chosen operation. - Test the complete message flow: Send to the test number, then verify the response and any delivery report or callback your application relies on. If users need to reply, configure and test inbound-message handling too.
- Prepare for production: Confirm number type and any registration requirements, destination coverage, rate limits for your service plan, pricing, and support arrangements before switching live traffic.
How much does Sinch SMS cost?
Sinch describes SMS API pricing as pay-as-you-go, charged per message. The actual amount depends on destination country and routing; service charges, phone-number fees, carrier fees, taxes and VAT can also affect the total. Sinch’s support article says country-specific rates apply and are subject to taxes and VAT (How much does it cost to send SMS?).
Check the live SMS pricing page for the destinations and configuration you plan to use. Sinch says it aims to update displayed prices at midnight UTC, so a rate is a point-in-time figure, not a guaranteed long-term price. Estimate both outbound and inbound traffic where applicable, and account for number and pass-through fees rather than comparing only a headline per-message rate.
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Decisions to make before launch
- Message direction: Decide whether you only send notifications or also accept replies. Inbound SMS changes how you handle callbacks and user responses.
- Delivery visibility: If your app must know whether a message was delivered, plan for delivery reports and callback handling rather than treating a successful API request as final delivery.
- Scale and limits: Check the rate limits tied to your service plan and whether the planned traffic pattern fits them. Sinch says limits depend on the plan; do not assume a universal throughput figure.
- Geography and compliance: Validate destination coverage, number type and registration needs, and the appropriate API region for your data-location requirements.
- Cost comparison: Compare providers using the same destination countries, message types, traffic mix, inbound/outbound needs, number and carrier charges, and service limits. Without a like-for-like current quote, “cheapest” is not an established conclusion.
What to expect from Sinch’s product claims
Sinch’s product pages describe its reach and uptime, but those statements are vendor claims, not dated independent performance measurements. For an application where availability is critical, assess the service terms and operational requirements that apply to your account rather than treating marketing claims as a guarantee.
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