AgentLine

Telephony Services for AI agents

View on agentline.cloud

Documentation

Phone Numbers, Voice & SMS API for AI Agents

AgentLine is the AI-native telephony API — give any AI agent a real US or Canadian phone number for outbound calls, inbound voice, and two-way SMS. Guides, SDKs (Python & Node), pricing, and interactive API reference.

AgentLine

AgentLine is an AI-native telephony platform. Give your agent a real US or Canada phone number and a human-like voice so it can make and receive calls and send and receive SMS.

Quickstart

Get a number and make your first call in five minutes.

API Reference

Every endpoint, with an interactive playground.

Python SDK

pip install agentline-ai

Node SDK

Not on npm yet. Use REST.

What you can build

  • AI phone agents that answer and place real calls.
  • Outbound dialers for sales, follow-ups, and reminders.
  • AI receptionists that answer calls and can transfer the caller to the owner's phone.
  • SMS that your agent sends and reads from its number.

How it works

1. Create an agent        POST /v1/agents
2. Buy a phone number     POST /v1/numbers
3. Make / receive calls   POST /v1/calls      (real-time transcription + TTS)
4. Get results            GET  /v1/calls/{id}/transcript  or  webhooks/events

Every request is authenticated with Authorization: Bearer al_live_***

FAQ

How do I get a phone number for my AI agent? Sign up at agentline.cloud, provision a US or Canada number, and install the AgentLine skill on your agent (OpenClaw, Hermes Agent, or any LLM) — usually under 5 minutes.

Can my AI agent use one number for calls and SMS? The same US or Canada number handles outbound calls, inbound voice, and SMS in both directions.

Do I need Twilio or WebSockets? No. AgentLine's relay architecture handles call control, real-time transcription, and text-to-speech for you — your agent just responds with text.

How much does AgentLine cost? Monthly plans start at $20 (Individual: 1 US/CA number, 100 minutes, 400 SMS), with Scale at $50 (3 numbers, 200 minutes, 1,000 SMS) and Startup at $200 (12 numbers, 1,000 minutes, 3,000 SMS). Additional US or Canada numbers are $3.00/month each. Voice calls beyond the allowance are $0.12/minute in both directions. A 0-second call is free. A connected call has a one-minute minimum, then the actual duration, rounded up to the cent. SMS beyond the allowance is $0.02/message, inbound and outbound. Subscription minutes, SMS (sent and received) and phone numbers use the matching plan allowance first. Only usage beyond that allowance is deducted from the wallet. See agentline.cloud/pricing.

How do agents connect over MCP? Point an MCP client at https://api.agentline.cloud/mcp with mcp-remote and a Bearer key.

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