AgentLine

AgentLine

AgentLinev1.12

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Introduction

Welcome to AgentLine — the voice and messaging infrastructure purpose-built for AI agents.

Traditional telephony APIs make you wire up call routing, manage audio streams, and stitch together speech-to-text and text-to-text services yourself. AgentLine runs the entire voice conversation for you and hands you back a clean transcript over plain HTTP — no servers or audio handling on your side (a webhook is optional, purely for event delivery).

Fully hosted conversations: You never run a server or decode audio. Create an agent, attach a real US phone number, trigger a call (or receive one), then get the transcript via a webhook or the Events Mailbox. Agents and humans use the exact same REST API.

Base URL: All API requests go tohttps://api.agentline.cloud

Two ways to use AgentLine

Interface Best for How REST API Scripts, backends, humans, any HTTP client curl / fetch with Authorization: Bearer $AGENTLINE_API_KEY MCP Server AI agents (Claude Desktop, Cursor, OpenClaw) Connect to /mcp — 23 telephony tools exposed natively Skill File Claude Code, Hermes, any agent with a system prompt Paste the SKILL.md URL — the agent learns the whole API

Quickstart Flow

1

Get an API key

Email-OTP flow (POST /v1/auth/otp → /v1/auth/verify). New accounts get a $2.50 bonus. Key starts with sk_live_.

2

Create an agent

POST /v1/agents — set name, system_prompt, initial_greeting, voice, and optional voicemail_message / owner_phone.

3

Buy a US number

POST /v1/numbers — $2.00 one-time, attach to the agent. One active number per agent.

4

Call / receive

POST /v1/calls to dial out, or let callers ring the number. Poll GET /v1/events for transcripts.

Before you call: Calls require a minimum balance of $0.50 (≈5 minutes). Check with GET /v1/billing/balance. Inbound calls are rejected if balance drops below $0.10.

Next How Calls Work

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Two ways to use AgentLineQuickstart Flow