Voice API for service businesses
Add AI receptionist to your app in one API call
Provision numbers, receive call intents and transcripts via webhooks. Built for plumbers, contractors, clinics. 100 free calls/month. Canadian-built, PIPEDA compliant.
No credit card required · First webhook in 5 minutes
Provision in one call
POST to provision a number. We handle routing and AI answering.
Webhooks for intents
Receive call summary, urgency, transcript. Integrate with CRM, Zapier, n8n.
100 free calls/mo
No credit card. Canadian-built. PIPEDA compliant.
Client webhooks
Sowa Answers subscribers can configure a webhook URL in their dashboard (or via Admin). When a call is answered and analyzed, we send a POST request to your URL with the event payload.
Event: call.completed
Sent when the AI receptionist has finished a call and post-call analysis is complete.
Payload (JSON)
{
"event": "call.completed",
"id": "call_xxx",
"phone_number": "+1234567890",
"timestamp": "2026-03-01T12:00:00.000Z",
"duration_seconds": 45,
"intent": {
"summary": "Customer needs same-day plumbing repair",
"urgency": "high",
"requested_action": "schedule_visit",
"extracted_data": {}
},
"transcript": "Full transcript..."
}Fields
event— Alwayscall.completedid— Unique call identifierphone_number— Caller's phone (E.164)timestamp— ISO 8601duration_seconds— Call lengthintent— summary, urgency, requested_action, extracted_datatranscript— Full transcript
We include X-Sowa-Signature (HMAC-SHA256) for verification.
Requirements
- Webhook URL must use HTTPS
- Your endpoint should respond with
200within 10 seconds - Configure in Dashboard → Systems (contact support if you need Admin access)
Sowa Flow — Invoice API
Generate professional PDF invoices with one API call. Auth: Bearer API key (lsk_...) or session cookie. Free tier: 10 invoices/month. Paid: 100/month.
Endpoint: POST /api/flow/invoices
Request body (JSON)
{
"from": { "name": "Your Business", "address": "...", "email": "..." },
"to": { "name": "Client Name", "address": "...", "email": "..." },
"items": [{ "description": "Service", "quantity": 1, "rate": 150 }],
"currency": "CAD",
"dueDate": "2026-04-01",
"invoiceNumber": "INV-001"
}Response
200 — PDF binary. 400 validation error. 401 unauthorized. 429 usage limit exceeded.
Sowa Flow · Dashboard Invoice Builder
Use cases
- Create a CRM lead when a call is handled
- Log calls to your internal system
- Trigger Zapier/Make/n8n workflows
- Sync with your calendar or booking tool