Transactional SMS API

Transactional SMS that just works.

Send OTPs, security alerts, and notifications globally. One API. Predictable pricing. 99.9% uptime.

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Trusted by engineering teams sending 50M+ messages monthly

Send a message POST /v1/messages 
curl -X POST https://api.notilify.com/v1/messages \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "to": "+14155550123",
    "from": "YourApp",
    "body": "Your code is 482910"
  }'

Response in < 500ms. Message delivered in seconds.

Every undelivered message costs you money. Most cost you customers.

Every failure has a cost

01

The login code that never arrives

Users abandon onboarding when the OTP is delayed or missing. They don't retry.

30% abandonment

02

The order confirmation that disappears

Customers don't know if payment went through. They email support. They call. They dispute.

03

The shipping update that gets lost

“Where is my order?” tickets account for 50% of ecommerce support volume.

$5-12 per ticket

04

The security alert that doesn't land

Fraud warnings go unseen. Password resets time out. New device logins go unnoticed.

05

The appointment reminder that fails

No-shows spike. Revenue drops. Ops teams scramble to fill gaps.

SMS delivery failure rates hit 15-20% in some regions. That's one in six messages vanishing into the void.

The infrastructure is messier than it looks

Your current provider abstracts this away until it breaks at 2am, messages stop delivering, and you're debugging carrier error codes instead of shipping features.

Notilify handles the mess.

Intelligent routing picks the best carrier. Automatic failover kicks in when routes fail. Built-in retries. 98%+ delivery rates and real-time visibility into every message.

98%+ delivery rate
Features

Infrastructure, not features.

Routing, retries, failover, observability, and pricing controls are built in. You ship the product. Notilify handles the delivery layer underneath it.

Send anywhere. Deliver everywhere.

Intelligent country-aware routing picks the best carrier for each destination. When one route degrades, failover happens automatically.

  • Automatic carrier failover
  • Per-country delivery optimization
US route EU route APAC route

Know what happened. Instantly.

Delivery status changes are pushed to your endpoint in real time with signed payloads you can verify and replay.

  • Sub-second webhook delivery
  • HMAC-signed payloads
  • Automatic retries if your endpoint is down
Webhook payload Signed 
{
  "event": "message.delivered",
  "message_id": "msg_8f3k2j4m",
  "to": "+14155550123",
  "timestamp": "2024-01-15T14:32:02Z"
}

From 1,000 to 1,000,000 messages. Same API.

Queue-based architecture scales horizontally, absorbs burst traffic, and retries transient failures without dropping messages.

  • Handles burst traffic without dropping messages
  • Exponential backoff retries built in
Retry queue health Autoscaled
Active failover route Healthy

Pay for what you send. That's it.

No monthly minimums. No platform fees. No surprises. Per-message pricing scales linearly with your growth.

  • No monthly minimums or platform fees
  • Clear per-message pricing
  • Volume discounts available
View Full Pricing →
Loading pricing SMS
...

Debug in seconds, not hours.

Searchable message logs and delivery analytics show exactly what happened to each message, with carrier response context.

  • Real-time delivery analytics
  • Message-level debugging
  • Usage and cost visibility
Message logs Live
Delivered +14155550123 / US 12:03
Queued +447700900123 / UK 12:04
Sent +61255550123 / AU 12:05

Send from your brand, not a random number.

Custom Sender IDs where supported. Dedicated numbers where required. Compliance is built into the sending layer.

  • Alphanumeric Sender IDs
  • Local and toll-free numbers
  • Per-country compliance built in
Sender configuration Ready
YourApp Alphanumeric sender ID
+1 (833) 555-0123 Toll-free dedicated number
Compliance Region-specific registration handled
How it works

Plug in fast. Operate with visibility.

Use Notilify from your existing backend, send one API request, absorb traffic spikes with queue-backed routing, and trace every delivery event in real time.

Integrates with any stack

Use Notilify from any framework, runtime, or backend service with no SDK lock-in or opinionated setup.

  • Works with REST backends, workers, queues, and cron jobs
  • Supports serverless, containers, and monoliths
  • No vendor-specific SDK required to ship
Notilify
POST /v1/messages
REST Node Python Go Java Jobs

Send one request

Create a message with a simple authenticated POST. Payloads stay predictable and boring.

  • Authenticate once with a bearer API key
  • Use plain JSON for recipients, sender IDs, and body text
  • Get message IDs back immediately for tracking
POST /v1/messages 
curl -X POST https://api.notilify.com/v1/messages \
  -H "Authorization: Bearer sk_live_..." \
  -H "Content-Type: application/json" \
  -d '{
    "to": "+14155550123",
    "from": "YourApp",
    "body": "Your verification code is 482910"
  }'
202 Accepted · msg_8f3k2j4m

Designed to scale

Built-in resilience controls absorb bursts and keep transactional traffic moving during peaks.

  • Handle traffic spikes and surges without downtime
  • Built-in throughput and backpressure management
  • Queue overflow protection ensures no message is lost
Queue time above threshold on `otp-us-east`
Destination max delivery rate
40 per minute
Update
Pending messages over time

Monitor and debug delivery in real time

Gain visibility into every message flow with searchable logs, retry tooling, and delivery metrics.

  • Trace every message through queued, sent, and delivered
  • Search logs by recipient, country, or delivery status
  • Export metrics for complete operational visibility
Prod / Metrics 24h
Total messages 12,432
Error rate 0.31%
Prod / Events Live
422 carrier timeout
200 delivered webhook
200 status update synced
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Use Cases

Built for transactional. Nothing else.

The messages your users are actively waiting for: login codes, security alerts, payment confirmations, reminders, delivery updates, and operational notifications.

OTP Alerts Confirmations Reminders
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OTP & Verification

Login codes. Phone verification. Password resets. The messages your users are actively waiting for.

Security Alerts

Suspicious login detected. New device added. Account changes. Time-sensitive security notifications.

Transaction Confirmations

Payment received. Order shipped. Booking confirmed. Automated notifications triggered by your system.

Delivery Updates

Out for delivery. Delayed shipment. Failed drop-off attempt. Status changes your customers expect to see immediately.

Appointment Reminders

Reduce no-shows with booking reminders, timing changes, and day-of updates that arrive before it is too late.

System Alerts

Server down. Threshold exceeded. Job completed. The operational messages your team needs right away.

Pricing

Simple pricing. No surprises.

Pay only for messages you send. No monthly fees. No minimums. No contracts.

Pay as you go

$0.0075 /sms

Usage-based pricing with no monthly minimums and no platform fees.

  • No monthly minimums or contracts
  • Real-time webhooks and full dashboard access
  • 10 free test credits to validate your integration

Loading live pricing from the API.

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FAQ

Frequently asked questions

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