SMS

SMS that reaches every phone

Two-way messaging with registered senders, honest delivery states and the cost of every message — through one small API call.

9:41

+61 480 013 422

Today · 2:14 pm

Acme Couriers: your parcel is out for delivery and will arrive 3–5pm. Reply 1 to leave it at the door or 2 to reschedule.

Thanks — we’ll leave it at the door and send a photo when it’s delivered.

Delivered 3:42pm. Photo: acme.to/p/7Hk2

3:42 pm

Text message

Why SendLab for SMS

Everything SMS needs, nothing it doesn’t

Two-way conversations

Send and receive on the same number, with replies delivered to your app by webhook.

Senders, registered with you

Numbers and sender IDs set up and registered per country — we handle the paperwork with you.

Honest delivery states

Accepted, submitted, delivered or failed — with the reason, never rounded up to “delivered”.

Opt-outs enforced

STOP and suppression handled on every send, so you never message someone who’s opted out.

Cost on every message

Segments and price per message, with prepaid spend controls and no surprises.

Reach worldwide

Send to customers around the world, with the rules for each destination confirmed up front.

Sender onboarding

Get your sender approved without the guesswork

Getting a sender approved is where most SMS projects stall. We make it a visible, supported workflow: what’s needed, what’s under review, what needs correcting, who owns the next step — and whether you’re actually live.

Approval is not activation

We show both separately, so “approved” never quietly means “not sending yet”.

Corrections, not dead ends

If something needs fixing, you’ll see exactly what and why — and we’ll help fix it.

Market by market

Registration rules differ by country and sender type. We confirm the steps for your destinations up front.

Sender readiness

Step	Owner	Status
Business details	You	Complete
Use case & sample messages	You + SendLab	Complete
Sender registration	SendLab	In review
Correction requested Add opt-out wording to sample 2	You	Needs input
Approved	Carrier / regulator	Pending
Activated for live traffic	SendLab	Pending

The API

Send your first SMS

One request with a destination, a message and your own reference. Delivery updates arrive by webhook.

Durable reference for safe retries
Signed delivery and inbound webhooks
Full message timeline in the console

More for developers →

import { SendLab } from "@sendlab/node";

const sendlab = new SendLab(process.env.SENDLAB_API_KEY);

await sendlab.messages.send({
  channel: "sms",
  to: "+61412345678",
  body: "Your booking is confirmed for Thu 10:30.",
  // your own ID — retrying with it never sends twice
  reference: "booking-4821",
});

from sendlab import SendLab

sendlab = SendLab(os.environ["SENDLAB_API_KEY"])

sendlab.messages.send(
    channel="sms",
    to="+61412345678",
    body="Your booking is confirmed for Thu 10:30.",
    # your own ID — retrying with it never sends twice
    reference="booking-4821",
)

curl https://api.sendlab.ai/v1/messages \
  -H "Authorization: Bearer $SENDLAB_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "channel": "sms",
    "to": "+61412345678",
    "body": "Your booking is confirmed for Thu 10:30.",
    "reference": "booking-4821"
  }'

Add more channels

RCS

Verified, branded messages with rich cards and one-tap replies.

Explore RCS 02

Email

Transactional email with authenticated domains and clear delivery events.

Explore Email 03

Voice

Programmable calls for codes, reminders and alerts that need a voice.

Explore Voice

Ready to take your messaging further

Tell us what you want your customers to be able to do. We’ll scope it with you and help you launch.