AgentCall is a phone number API built for AI agents. It lets autonomous software provision real SIM phone numbers, send and receive SMS, make voice calls, and automatically extract OTP verification codes — all through a simple REST API with webhook delivery.

How much does AgentCall cost?

AgentCall has a free tier ($0/month) with 1 phone number, 50 SMS, and 10 voice minutes. The Pro plan is $19.99/month plus usage: numbers at $2/month each, SMS at $0.015/message, voice at $0.035/minute, and SIM numbers at $8/month each.

How does AgentCall work?

Sign up and get an API key in 30 seconds. Use one API call to provision a real phone number. Set a webhook URL to receive SMS and call events. Your agent receives OTPs, messages, and calls in real time — no polling, no manual intervention.

Who is AgentCall for?

AgentCall is built for AI agent developers, browser automation teams, AI voice agent builders, and SaaS platforms that need to give their autonomous software real phone capabilities — account verification, SMS conversations, voice calls, and OTP extraction.

What is the difference between AgentCall and Twilio?

Twilio is built for human developers building traditional apps. AgentCall is purpose-built for AI agents — it offers real SIM numbers (not VoIP) that pass strict verification, automatic OTP extraction, per-agent isolation, and an agent-native API. Twilio's VoIP numbers often get blocked by platforms.

Does AgentCall provide real SIM numbers?

Yes. AgentCall offers real SIM and non-VoIP numbers at $8/month each. These pass strict platform verification checks from services like Stripe, Google, and banks that block standard VoIP numbers. Local and toll-free numbers are also available at $2/month.

Can AgentCall extract OTP codes automatically?

Yes. When an SMS containing a verification code arrives at an AgentCall number, the OTP is automatically detected and extracted. It's delivered to your webhook endpoint instantly so your agent can use it without parsing the message body manually.

What countries does AgentCall support?

AgentCall currently supports phone numbers in the United States, Canada, and United Kingdom. You can provision local, toll-free, mobile, and SIM numbers in these countries. More countries are being added based on demand.

AgentCall: Phone Infrastructure for AI Agents

What Is AgentCall?

AgentCall is the phone number API for AI agents. It gives every agent its own real SIM number with SMS, voice, and OTP capabilities — the same way a mobile carrier gives humans phone numbers, but through an API.

We built AgentCall because the existing telephony APIs (Twilio, Telnyx, Vonage) were designed for human-facing products. When developers started building AI agents that needed phone numbers — for verification, outreach, and two-way communication — those APIs fell short. VoIP numbers get blocked. There's no OTP extraction. There's no concept of agent isolation.

AgentCall solves these problems with three design principles: real SIM numbers, agent-native APIs, and zero human intervention.

Design Principles

Real SIM Numbers

Every number provisioned through AgentCall is a real SIM-backed mobile number issued by an actual carrier. This matters because most services — from Stripe to WhatsApp — use carrier databases to detect and reject VoIP numbers. Real SIM numbers pass these checks every time.

Agent-Native APIs

Our SDK is designed for how agents work, not how humans work. Instead of generic messaging primitives, we provide agent-specific operations:

numbers.provision() — get a number in one API call
sms.waitForOTP() — receive and extract OTP codes automatically
sms.inbox() — read all messages for a number
calls.initiate() — make outbound voice calls
webhooks.create() — get real-time events pushed to your endpoint

Zero Human Intervention

Nothing in AgentCall requires a dashboard, a manual step, or a human approval. Numbers are provisioned via API. Messages are received via webhook. OTPs are extracted automatically. Your agent operates completely autonomously.

How It Works

import AgentCall from 'agentcall';

const client = new AgentCall({ apiKey: 'ac_live_...' });

// 1. Provision a real SIM number
const number = await client.numbers.provision({
  country: 'US',
  type: 'sim',
});

// 2. Use the number to sign up for a service
// (your browser automation agent enters number.number)

// 3. Receive the OTP automatically
const otp = await client.sms.waitForOTP(number.id);

// 4. Send an SMS
await client.sms.send({
  from: number.number,
  to: '+13125557890',
  body: 'Hello from my agent!',
});

// 5. Make a voice call
await client.calls.initiate({
  from: number.number,
  to: '+13125557890',
});

That's the entire surface area. Five methods cover 95% of what agents need from a phone number.

Who Is It For?

Browser Automation Agents

Agents using Playwright, Puppeteer, or similar tools to automate web workflows. The most common use case: navigating a signup flow that requires phone verification.

Customer Service Agents

AI agents that handle inbound and outbound calls, send follow-up SMS messages, and manage customer conversations through a dedicated phone number.

Outbound Sales Agents

Agents that initiate calls to leads, send follow-up texts, and manage multi-touch campaigns — all from their own isolated number.

Multi-Agent Platforms

Platforms running many agents at once, where each agent needs its own number for isolation. AgentCall's provisioning API scales to thousands of numbers without manual management.

Architecture

AgentCall sits between your agent and the phone network:

Your agent calls the AgentCall API via our SDK
AgentCall manages the SIM infrastructure, carrier connections, and message routing
The phone network delivers SMS and voice to real phone numbers worldwide

All communication flows through our API. Your agent never interacts directly with carrier infrastructure — we handle provisioning, routing, compliance, and delivery.

Pricing

AgentCall has simple two-tier pricing with no per-seat fees:

Free: 1 number, 50 SMS/month, 10 voice minutes
Pro ($19.99/mo): Unlimited numbers ($2-8/mo each), SMS at $0.015/msg, voice at $0.035/min

No minimums, no contracts. Pay only for what your agents use.

Getting Started

Install the SDK and provision your first number in under a minute:

npm install agentcall

Then head to the dashboard to generate an API key. From there, your agents are one API call away from their own phone number.

FAQ

What countries are supported?

We currently support US numbers with international expansion underway. Contact us for specific country availability.

Is there a rate limit?

Free tier: 50 SMS/month. Pro tier: no hard rate limit, billed at $0.015/message and subject to carrier throughput.

How is this different from buying a SIM card?

Buying a physical SIM gives you one number that requires a phone to operate. AgentCall gives you unlimited numbers through an API on the Pro plan — no hardware, no manual management, no physical devices. It's SIM-backed infrastructure delivered as a service.