How to start sending messages with GatewayAPI

Step 1 — Create your account

1. Sign up. Head to gatewayapi.com and create an account. Onboarding is self-service, so you can start immediately. New accounts include Test credits on request to test with.
2. Grab your keys. Open the dashboard and copy your credentials. GatewayAPI uses API token sent as an Authorization: Token header (recommended); token query parameter, legacy HTTP Basic auth and OAuth 1.0a also supported. EU-hosted accounts use gatewayapi.eu instead of gatewayapi.com..

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 https://gatewayapi.com/rest/mtsms \
  -H "Authorization: Token YOUR_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"sender": "ExampleSMS", "message": "Hello World", "recipients": [{"msisdn": 4512345678}]}'

The request hits https://gatewayapi.com/rest/mtsms. A 2xx response means GatewayAPIhas 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.GatewayAPI ships SDKs for .Full reference lives in the GatewayAPI documentation.

What's next

• Add more channels. GatewayAPI also supports RCS, Email — reuse the same account and credentials.
• Mind compliance. GatewayAPI is GDPR aligned, with EU and no US data residency options.
• Compare before you commit. See how GatewayAPI stacks up on the provider table or in a head-to-head comparison.