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SendiMessage
Request a Line
Managed Business Messaging

Messaging infrastructure that speaks your language.

One API for SMS, iMessage where supported, incoming replies, and delivery events. Managed messaging lines. Real conversations.

Production messaging lines are reviewed and provisioned with our team.

Retail line · +1 555 0100
Commerce PlatformPOST /send-message
SendiMessage API
Routing
Customer
iMessageready
SMS fallbackready

Demo conversation transcript: business sends “Your order has shipped.”.

POST /send-message
{
  "number": "+1 555 0123",
  "content": "Your order has shipped."
}
Signature verified Delivery 200 OK
Interactive simulation
  1. 10:24:01Request accepted

Request created — POST /send-message

  • Key-pair credentials
  • Signed webhooks
  • Delivery event history
  • Managed activation
  • Incoming replies where configured
What SendiMessage provides

Everything you need to send and track messages.

Managed messaging lines
Dedicated messaging lines provisioned and configured for your business.
SMS · iMessage · Hybrid
One messaging API
Send SMS and supported iMessage traffic through one predictable API.
POST /send-message
Delivery and replies
Track delivery states and receive customer replies through webhook events.
signed webhooks
Guided activation
Our team reviews, provisions, tests, and activates each approved line.
assisted onboarding
Use cases

Built for real customer communication.

The everyday, transactional messages your customers actually want to receive.

Order & shipping updates
Keep customers informed from checkout to doorstep.
POST /send-message
{
  "number": "+15555550123",
  "content": "Your order has shipped.",
  "channel": "auto"
}
requested: autoselected: iMessagefallback: SMS ready
customer device
Your order has shipped.
Thanks!
Delivered · delivery event created · reply received
Channel routing

One request. The right delivery path.

Automatic routing picks the best channel, falls back to SMS when needed, and captures replies — all through one API.

Request received
Line checked
Recipient eligibility checked
Best channel selected
Message sent
Watch SendiMessage

See how product events become customer conversations.

Watch a short product tour covering messaging lines, API requests, routing, customer replies, and webhooks.

Visit YouTube
Live playground

Try the SendiMessage flow.

Interactive simulation — nothing is sent, and stage names are simulation stages, not API status values.

Build a request and run the delivery lifecycle. No real message is ever sent.

curl --request POST \
  --url "https://api.sendimessage.com/v1/send-message" \
  --max-time 15 \
  --header "Accept: application/json" \
  --header "Content-Type: application/json" \
  --header "X-API-Key: ${SENDIMESSAGE_API_KEY}" \
  --header "X-API-Secret: ${SENDIMESSAGE_API_SECRET}" \
  --data '{
  "number": "+15551234567",
  "content": "Hello from the API",
  "media_url": null,
  "status_callback": "https://example.com/callbacks/status",
  "line_handle": "line_example"
}'
lifecycle
Validated
Queued
Routing
Sending
Sent
Delivered
response · 201 Created
{
  "message_handle": "msg_01kym1ztw3rgeaysrfchdhr0vj",
  "status": "QUEUED",
  "line_handle": "line_example"
}
Workflow

Build your messaging workflow.

Configure a trigger, channel, and delivery behavior — the request, routing, and webhook update live. Nothing is sent.

Preferred channel

Order shipped sent via automatic routing with SMS fallback. Replies enabled, delivery webhook enabled.

Order shippedSendiMessage APIAutomatic routingiMessage when availableSMS fallback enabledDelivery webhookIncoming replies enabled
POST /send-message
{
  "number": "+15551234567",
  "content": "Your order has shipped.",
  "line_handle": "line_example",
  "status_callback": "https://example.com/callbacks/status"
}
Your order has shipped.
Thanks. When will it arrive?
webhook →
{
  "type": "receive",
  "data": {
    "message_id": "msg_01…"
  }
}
Assisted onboarding

From request to production, with our team beside you.

Every messaging line is reviewed and provisioned by the SendiMessage team — no self-service setup.

1
Tell us what you need
Share your target country, messaging use case, expected volume, and number of required lines.
2
We review and provision
Our team reviews availability and provisions the approved messaging line.
3
Receive your integration details
We provide your API credentials and the exact steps required to connect your application.
4
Test and activate
Send test messages, verify delivery events, and complete production activation with SendiMessage support.
Pricing

Pricing built around your messaging lines.

Choose the number of managed messaging lines you need. Message usage, provider costs, onboarding, and custom requirements are reviewed for your setup — final pricing is confirmed after review.

Contact us for current per-line pricing

One line is one active, dedicated messaging number or sending channel provisioned for your business.

Dedicated messaging line
API access
Secure API credentials
Delivery tracking
Webhook events
Message logs
Integration guidance
Standard support
Security & reliability

Built for controlled communication.

We list only what actually exists today. No invented certifications, uptime numbers, or coverage claims.

Hashed API keys
Only a secure hash of each key secret is stored. The full secret is shown to you once and never retrievable.
Least-privilege API credentials
Integration keys can send and read messages but can never manage users, credentials, or billing — those stay portal-only.
Signed webhooks
Every event is signed so you can verify it came from SendiMessage before you trust it.
TLS in transit
All API and webhook traffic is encrypted in transit over HTTPS.
Credential rotation & revocation
Keys can be rotated or revoked, with a last-used timestamp for visibility.
Audit logging
Credential delivery and important actions are recorded for accountability.
Book a demo

Still sending SMS?

Switch to iMessage and get 2–3× higher response rates. No A2P registration. No carrier filtering. Just real conversations.

See it live on your own use case — a quick demo, scheduled over text.

Book my demo
Still sending SMS? Switch to iMessage and get 2–3× higher response rates. No A2P registration. No carrier filtering. Just real conversations.
FAQ

Questions, answered.

The essentials about lines, onboarding, and pricing.

What is a messaging line?
One active, dedicated messaging number or sending channel provisioned for your business. It includes API access, delivery tracking, and webhooks.
Can I activate a line myself?
No. Lines are reviewed and provisioned by the SendiMessage team so we can confirm your country, use case, and volume before you go live.
Do I need an account?
There's no public signup. You request a line, and we set you up — credentials are delivered to you securely.
How is pricing calculated?
Pricing is organized around your active managed messaging lines, plus message usage, provider-related charges, and onboarding scope. Final pricing is confirmed after reviewing your setup — the builder on /pricing prepares that review.
Is message usage included?
Any included allowance is confirmed with your quote. Usage beyond that is billed separately where applicable.
Does every line support iMessage?
No. iMessage delivery is available only on supported lines and destinations. When configured, SMS fallback can be used if iMessage is unavailable.

Ready for a dedicated messaging line?

Tell us about your use case and volume. A SendiMessage integration specialist will review your request and guide your setup through production.