How to start sending messages with Sinch

Step 1 — Create your account

1. Sign up. Head to www.sinch.com and create an account. Onboarding is self-service, so you can start immediately. New accounts include free trial credit to test with.
2. Grab your keys. Open the dashboard and copy your credentials. Sinch uses Bearer token auth using your API token in the Authorization header.
3. (Optional) Use the sandbox. Sinch offers a test environment, so you can validate your integration before sending live traffic.

Step 2 — Send your first SMS

The fastest path is a single API call. Drop in your credentials and a destination number, then run this from your terminal:

curl -X POST 'https://us.sms.api.sinch.com/xms/v1/YOUR_SERVICE_PLAN_ID/batches' \
  -H 'Authorization: Bearer YOUR_API_TOKEN' \
  -H 'Content-Type: application/json' \
  -d '{"from":"+15005550006","to":["+15551234567"],"body":"Hello from Sinch"}'

The request hits https://us.sms.api.sinch.com/xms/v1/{service_plan_id}/batches. A 2xx response means Sinchhas accepted your message for delivery — you should see it arrive within seconds.

Step 3 — Go native with an SDK

Once the raw call works, switch to an official SDK for retries, typing and error handling.Sinch ships SDKs for Java, Python, C#, Node.js, PHP, and Node.js is a great place to start.Full reference lives in the Sinch documentation.

What's next

• Add more channels. Sinch also supports WhatsApp, RCS, Viber, Voice — reuse the same account and credentials.
• Mind compliance. Sinch is GDPR, ISO 27001, SOC 2, HIPAA aligned, with EU and US data residency options.
• Compare before you commit. See how Sinch stacks up on the provider table or in a head-to-head comparison.