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SendiMessage
Start Pilot
Managed Business Messaging

iMessage and SMS infrastructure for developers.

Send and receive customer messages over iMessage where supported, with SMS fallback — all through one REST API. Managed lines, incoming replies, webhooks, and delivery events included.

  • Managed lines
  • Two-way messaging
  • Webhooks
  • Assisted onboarding
  • Key-pair credentials
  • Signed webhooks
  • Delivery event history
  • Managed activation
  • Incoming replies where configured
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
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
Playground

Try the SendiMessage flow.

Interactive API preview — build the real request, then run the delivery lifecycle. Nothing is sent; stage names are simulation stages, and the response panels use the live-captured contract shapes.

Routing is automatic (iMessage-first, SMS fallback) — there is no channel field on the real request.

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": "+15555550123",
  "content": "Your order has shipped.",
  "media_url": null,
  "status_callback": "https://example.com/callbacks/status",
  "line_handle": "8eb3ecaf-6487-485d-b01c-b18bdcb57180"
}'
lifecycle — simulation stages
Validated
Queued
Routing
Sending
Sent
Delivered
response · 201 Created · live-captured shape
{
  "status": "QUEUED",
  "message_handle": "4e828182-a640-483f-bfe9-17ffcaa51d48",
  "to": "+15555550123",
  "content": "Your order has shipped.",
  "service": null,
  "is_outbound": true,
  "error_message": null,
  "date_sent": null
}
Managed infrastructure

You build the product. We manage the messaging layer.

A managed line is not just a phone number — it’s the operated messaging system your application talks to through one API, so you never run messaging infrastructure yourself.

You own
  • Your AI agent, CRM, or application
  • Reasoning, responses, and workflow logic
  • When and what to send
  • How replies drive the next action
SendiMessage provides
  • Managed messaging lines
  • One REST API to send
  • Inbound reply processing
  • Signed webhooks
  • Conversations & contacts
  • Operational line management
  • API-first
  • Signed webhooks
  • Managed lines
  • Two-way messaging
  • Tenant-isolated organizations
Security →
Pricing

Pricing built around your messaging lines.

Start with a Developer Pilot at $149 for the first month, then scale by the line. Message usage, provider costs, onboarding, and custom requirements are reviewed for your setup — final pricing is confirmed after review.

Starting at $239 per line / month

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
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?
The Developer Pilot is $149 for the first month; dedicated production lines start at $239 per line per month, with volume pricing for multi-line setups. Message usage, provider-related charges, and onboarding scope are confirmed for your configuration during 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.

Put SendiMessage into your real workflow

Start with one managed line, connect the API, test outbound messaging, incoming replies, and webhooks — then scale when you’re ready.