Documentation

Everything you need to know about Call0 — setup, channels, pricing, and Agent0.

Pricing

Pay only for what you use. No monthly fees. Free tiers included.

Phone

Inbound and outbound voice calls handled by AI agents

$0.15/min

15 free minutes (one-time)

WhatsApp

Automated replies to incoming WhatsApp messages

$0.03/msg

100 free messages (one-time)

Email

AI-generated responses to incoming emails

$0.02/msg

50 free emails (one-time)

How billing works

  • 1.Every channel includes a one-time free tier, valid for 1 month after signup.
  • 2.After free tiers, usage is deducted from your credit balance.
  • 3.Purchase credit packages ($10–$100) or enable auto-refill to stay running.
  • 4.All channels share the same credit balance — one purchase covers everything.

Agent0 — AI Support Assistant

Your built-in AI helper for everything Call0.

  • -Agent0 is available in the dashboard sidebar under "Agent0"
  • -Ask questions about how to set up agents, connect channels, or configure billing
  • -Get help with system prompts, voice selection, and booking setup
  • -Agent0 knows Call0's pricing, features, and best practices
  • -Chat history is saved — continue conversations across sessions
  • -For critical issues, contact support@call0.de directly

Getting Started

Set up your first AI agent in minutes.

  • -Create your account and log in
  • -Set up your first AI agent using the guided setup or website import
  • -Purchase or import a phone number
  • -Connect WhatsApp and Email channels
  • -Assign agents to your channels and start receiving interactions

Agent Configuration

Customize your AI agents for your specific business needs.

  • -System prompt: Define how your agent behaves, what it knows, and how it responds
  • -Voice selection: Choose from 100+ natural-sounding voices across 29+ languages
  • -Language: Automatic detection and response in 11+ languages
  • -Booking system: Automatic appointment, order, and reservation handling
  • -Knowledge base: Upload menus, price lists, FAQs, or any business information
  • -Max call duration: Set limits per agent (default: 30 minutes)

Phone Channel

Manage phone numbers and call routing.

  • -Purchase local or toll-free numbers from 40+ countries
  • -Import existing numbers from other providers
  • -Assign agents to specific numbers for automatic call handling
  • -View detailed call logs, transcripts, and analytics per number
  • -Configure call duration limits and interrupt sensitivity

WhatsApp Channel

Connect WhatsApp for automated messaging.

  • -Connect your WhatsApp number by scanning a QR code
  • -Auto-reply to incoming messages using your agent's configuration
  • -Messages are processed through your agent's system prompt and knowledge base
  • -Only private (direct) messages are handled — group messages are ignored
  • -View message counts and status in the channel dashboard

Email Channel

Automate email responses with AI.

  • -Connect your Gmail account via OAuth for secure access
  • -AI-powered auto-replies based on your agent's configuration
  • -Automatic email polling and response generation
  • -Maintains conversation context for follow-up emails
  • -View sent/received message counts in the channel dashboard

API Reference

Integrate Call0 into your existing systems with our REST API.

Authentication

All API requests require a Bearer token. Get your API key from Dashboard > Settings.

Authorization: Bearer YOUR_API_KEY

Endpoints

GET/api/agentsList all agents
POST/api/agentsCreate a new agent
PUT/api/agents/:idUpdate an agent
DELETE/api/agents/:idDelete an agent
GET/api/callsList call logs with transcripts
GET/api/analyticsGet call analytics (days param)
GET/api/analytics/problemsGet problem analysis from transcripts
GET/api/reports/weeklyGenerate weekly report
GET/api/reports/script-optimizerGet script improvement suggestions
GET/api/bookingsList bookings
POST/api/bookingsCreate a booking
POST/api/bookings/:id/changeRequest booking change (sends SMS)
POST/api/bookings/auto-fillNotify waitlist on cancellation
GET/api/offersList offers/quotes
POST/api/offersCreate an offer
PUT/api/offers/:idUpdate or send offer via SMS
GET/api/subscriptionsList customer subscriptions
POST/api/subscriptionsCreate a subscription
PUT/api/subscriptions/:idUpdate subscription (pause/cancel/change)
POST/api/phone-numbers/sipRegister a SIP phone number

API Pricing

1.API access is included free with every account

2.API calls consume the same credits as dashboard usage

3.Rate limit: 60 requests/minute per account

4.Webhook callbacks for real-time call events (configurable per agent)

Included with Every Account

No hidden fees. Everything you need is included.

Unlimited AI agents
Unlimited phone numbers
All 100+ voices included
Full call transcripts & analytics
11+ language support
Booking & appointment system
Knowledge base / FAQ uploads
All integrations & API access
Agent0 AI support assistant
24/7 agent availability