Your number.
For calls, texts, and agents.
Pick a number, pay as you go — $0.010 flat for calls and texts. No setup fees, no contracts.
$0.010 flat for everything. No surcharges, no surprises. Plans or pay-as-you-go.
1 phone number* included
Overages: $0.010/unit
* Standard local number ($1.00/mo). Other number types purchased separately.
Pay only for what you use.
1+ phone numbers at $1.00/mo each.
Billed monthly.
$5 minimum credit required to activate.
* SMS available in beta for JP, CA, MX, and PM. US SMS coming after 10DLC registration.
¹ Some rural US area codes (high-cost NPA/NXX) are excluded from plan minutes and PAYG coverage. Affected calls are billed at carrier cost + fixed markup and flagged at time of call.
Get a number, configure where audio goes, start receiving calls.
Get a phone number
Search by area code. Purchase instantly. Live in seconds.
{ "area_code": "212" }
Set your endpoint
Tell Kadeno where to send audio and SMS. WebSocket or HTTP.
{ "voice_url": "wss://..." }
Handle calls and messages
Audio streams in real time. SMS forwarded to your endpoint. You process, we relay.
// Process however you want
Kadeno is telephony infrastructure. What you build on it is up to you.
AI Voice Agents
Give your AI agent a real phone number. Kadeno streams call audio to your AI endpoint and relays responses in real time.
Learn more →VoIP Applications
Build consumer or business calling apps. Kadeno provides the connectivity, you build the experience.
Call Analytics
Intercept and analyze call audio for quality monitoring, compliance, sentiment analysis, or transcription.
One API key. RESTful endpoints. Real-time audio over WebSocket.
- ✓ Provision numbers via REST API
- ✓ Real-time audio streaming (WebSocket)
- ✓ Per-resource usage metering
- ✓ Webhooks for call events and delivery status
# Search for a number curl https://api.kadenotec.com/v1/numbers/search \ -H "Authorization: Bearer kd_live_..." \ -d '{ "area_code": "415" }' # Purchase and configure curl -X POST .../v1/numbers/purchase \ -d '{ "number": "+14155550123", "voice_url": "wss://your-app.com/voice" }' # Done. Calls now route # to your endpoint.
Programmable telephony built for developers.
Voice API — Programmable voice with real-time audio streaming. Make and receive phone calls via SIP or WebSocket. G.711 codec support. Sub-200ms latency.
Phone Number Provisioning — Search and purchase local and toll-free US phone numbers via REST API. Instant activation. Assignable to any endpoint.
Real-Time Audio Streaming — Bidirectional audio over WebSocket for voice AI, call transcription, sentiment analysis, and live audio processing.
SIP Trunking — Enterprise-grade SIP connectivity with IP-based authentication. Compatible with FreeSWITCH, Asterisk, and any SIP system.
Call Control — Programmatic call management. Initiate outbound calls, transfer, play audio, gather DTMF input, and record.
Webhooks & Events — Real-time notifications for call state, SMS delivery, and number status. HMAC signature verification.
Usage Metering — Per-resource usage tracking. Track minutes, messages, and numbers. Build your own billing with custom markup.
AI-Ready — Purpose-built for AI voice agents and conversational AI. Connect any AI engine — OpenAI, Anthropic, custom models, or CAIZA. Kadeno handles telephony, you handle intelligence.
Build with Kadeno.
Create an account. Get an API key. Provision your first number in under a minute.
Pay-as-you-go. No contracts. No minimums.