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Bring status events into your workflow

A focused API for business messaging.

Use authenticated endpoints and webhooks to create approved operational notifications, observe delivery, and connect status events to the systems your team already uses.

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$29/month when approved service can activate · no free trial · 500 units included

Business software and an operations workspace connected through a secure integration hub
Connect the workflow
  • Server-side credentials
  • Idempotent sends
  • Signed webhook events

How the workflow moves

From the first signal to a resolved update.

  1. 01

    Authenticate the company

    Use workspace-scoped credentials from a trusted server environment. Never expose credentials in browser code.

  2. 02

    Create the action

    Submit the recipient, approved content, and an idempotency key through the documented endpoint.

  3. 03

    Reconcile the result

    Consume signed callbacks for delivery and opt-out changes, then acknowledge retries safely.

01

REST foundations

Predictable requests and explicit outcomes.

Version 1 exposes contact upsert/lookup, queued one-to-one notifications, reminders, and status/delivery reads under /api/v1.

  • Bearer workspace API keys
  • Idempotency-Key on every mutation
  • 202 for accepted mutations
02

Webhook safety

Verify before you trust an event.

Verify Smsify-Timestamp and the v1 HMAC over timestamp-dot-raw-body, deduplicate Smsify-Event-Id, and treat repeated delivery as normal.

  • Opt-out and status events
  • Delivery and reminder result
  • Exponential retry and delivery logs
03

Usage-aware automation

The API uses the same transparent unit model.

Messages consume their rendered carrier segments. Account balance, consent, suppression, and sending controls still apply.

  • Segment-based SMS units
  • Shared account balance
  • No compliance bypass through API

Clear before you commit

Questions, answered.

Need another detail? Review the help center before creating an account.

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Is the API available during a trial?

CLP Relay Workspace has no free trial. API access is part of an active eligible subscription.

Can browser JavaScript call the API directly?

Use CLP Relay Workspace credentials only from a trusted server. Client-side applications should call your own backend.

Make the next update accountable

Give every customer update an owner and every teammate the same context.

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$29/month begins when the approved service can activate. No free trial. Company and carrier review apply.