HeyMello Documentation

Build AI voice agents that make and answer real phone calls — in 30+ languages, anywhere in the world.

Welcome to the HeyMello docs. HeyMello lets you create AI voice agents that talk to your customers on the phone: qualifying leads, booking appointments, answering support questions, and following up — 24/7, in natural human-sounding voices.

These are the public (product) docs, written for anyone using HeyMello to build and run voice agents. No coding is required to get started, but developers get a full REST API too.

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Start here

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Documentation map

Getting started

• Introduction
• Quickstart
• How HeyMello works

Building agents

• Create an agent
• Prompts & agent behavior
• Voices & languages
• Knowledge base
• Tools & custom functions
• Appointment bookings

Telephony

• Phone numbers
• Inbound calls
• Outbound calls
• Campaigns (bulk calling)

Test & go live

• Test your agent
• Launch checklist

Monitor

• Call logs
• Post-call analysis
• Analytics
• Integrations

API reference

• Overview
• Authentication
• Core endpoints

Account

• Billing & credits
• Team & roles
• Regions & compliance
• FAQ

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Who HeyMello is for

• Sales & marketing teams — qualify and follow up with leads at scale.
• Support teams — answer common questions and route calls instantly.
• Operations & booking businesses — clinics, salons, real estate, services — take bookings by phone automatically.
• Developers — integrate voice agents into your product via the REST API and webhooks.

Built for businesses worldwide, with local phone numbers, languages, and compliance in mind. We started with the UK and India and support many other countries today.

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Need help? Contact your HeyMello account team or support.