SoftLinkSMS API v1

SMS and email that
tell you what happened.

One HTTP call to reach any phone or inbox in Kenya, and a signed webhook when it arrives. Plain JSON, no SDK needed.

Send your first SMS API reference

curl https://api.softlinksms.co.ke/api/v1/sms \  -H "X-Api-Key: $SOFTLINK_API_KEY" \  -H "Idempotency-Key: otp-7f3c2a" \  -H "Content-Type: application/json" \  -d '{    "recipients": ["+254712345678"],    "body": "482913 is your Acme code.",    "traffic_class": "transactional"  }'

→ 201 Created. Retry it with the same key and nothing is sent twice.

Quickstart

Get a key and send your first SMS in five minutes.

One-time codes

Fast, retry-safe codes from your own sender ID.

Transactional email

Receipts and alerts, with bounces handled for you.

API reference

Every endpoint, field and error, with a live console.

Built to be depended on

The parts that usually go wrong in a messaging integration, handled in the API and documented down to the byte.

Retries that never double-sendIdempotency keys on every send. A retried request returns the original result and charges nothing extra.Signed, replayable webhooksHMAC-signed events, retried over 45 hours, with a 30-day log you can query and redeliver.Errors you can branch onOne shape everywhere. A stable code for every case, and the fix for each one.Codes jump the queueTransactional codes are sent ahead of bulk traffic. A campaign never delays a login code.Docs your AI can readEvery page as Markdown, plus llms.txt. Paste a link into Cursor or Claude and it just works.