Phone Number API for AI Agents

AgentCall is the phone number API built specifically for AI agents and autonomous software. It provisions real SIM and local phone numbers via a single API call, delivers SMS and voice call events to your webhook in real time, and automatically extracts OTP verification codes. Unlike Twilio and Telnyx, AgentCall's non-VoIP numbers pass strict platform verification that blocks standard VoIP lines. Free tier available, Pro at $19.99/month plus usage.

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Key Features

AgentCall provides everything an AI agent needs to communicate via phone: real SIM numbers that pass verification, programmable voice calls, SMS messaging, and automatic OTP extraction. All delivered via REST API with real-time webhook events and per-agent isolation.

Real SIM Numbers

Non-VoIP numbers that pass Stripe, Google, and bank verification. $8/mo for SIM, $2/mo for local.

Voice Calls

Make and receive voice calls programmatically. Full duplex, low latency, AI voice provider compatible.

SMS Inbox

Dedicated SMS inbox per number. Send, receive, and search messages via REST API.

OTP Auto-Extraction

Verification codes detected and extracted automatically from incoming SMS. Delivered to your webhook instantly.

Agent Isolation

Each agent gets its own number. Compromise or ban of one never cascades to others.

Usage-Based Pricing

No per-seat fees or minimums. Pay only for the numbers, minutes, and messages you use.

Multi-Country

Provision numbers in the US, Canada, and UK. Choose local, toll-free, mobile, or SIM type.

Webhook Delivery

Real-time event delivery for SMS received, calls incoming, OTP detected. Fully async, no polling.

How It Works

AgentCall gets your agent a phone number in under 60 seconds. Sign up for an API key, provision a number with one API call, set your webhook URL, and start receiving SMS, calls, and OTPs in real time. No phone infrastructure expertise required.

StepActionTimeDescription
1Sign Up30 secCreate account at agentcall.co and receive your API key instantly.
2Provision Number5 secOne API call to get a real phone number. Choose country, type, and capabilities.
3Set Webhook1 minConfigure your webhook URL to receive SMS, call, and OTP events.
4Go LiveReal-timeYour agent receives calls, SMS, and OTPs delivered to your endpoint instantly.

AgentCall vs Twilio vs Telnyx

AgentCall is purpose-built for AI agents while Twilio and Telnyx are general-purpose telecom APIs built for human developers. AgentCall offers real SIM numbers that pass strict verification, automatic OTP extraction, and per-agent number isolation — features that don't exist in traditional telecom platforms.

FeatureAgentCallTwilioTelnyx
Built for AI Agents
Real SIM / Non-VoIP Numbers
Automatic OTP Extraction
Voice Calls
SMS Send & Receive
Per-Agent Isolation
Webhook Event Delivery
Free Tier
Base Price$0 / $19.99/moPay-as-you-goPay-as-you-go
Number Cost$2–$8/mo$1–$6/mo$1–$5/mo
SMS Price$0.015/msg$0.0079/msg$0.004/msg
Voice Price$0.035/min$0.014/min$0.01/min
Setup Time< 1 minute10–30 minutes10–30 minutes
Contract Required
Best ForAI agents & automationGeneral telecom appsEnterprise SIP trunking

Who It's For

AgentCall serves any developer or team building AI agents that need to interact with the phone network — whether for account verification, customer outreach, voice conversations, or automated testing of SMS flows.

AI Agent Developers

Building autonomous agents that sign up for services, verify accounts, and communicate via phone. AgentCall provides the phone infrastructure your agent needs.

Browser Automation Teams

Running agents that navigate websites and need real phone numbers to pass SMS verification during account creation and login flows.

AI Voice Agent Builders

Creating voice AI agents for inbound support or outbound sales calls. AgentCall provides programmable numbers with full voice capabilities.

SaaS Platforms

Integrating phone capabilities into AI-powered products so end users can call, text, and verify through your platform.

Pricing

AgentCall offers a free tier for prototyping and a Pro plan for production workloads. No contracts, no per-seat fees. Usage-based pricing means you only pay for what your agents consume. Start free with 1 number, 50 SMS, and 10 voice minutes per month.

FeatureFreePro
Monthly Price$0$19.99
Phone Numbers1 includedUnlimited ($2/mo each)
SIM NumbersNot available$8/mo each
SMS50/month$0.015/message
Voice Minutes10/month$0.035/minute
OTP WebhooksIncludedPriority delivery
SupportEmailPriority email
ContractNoneNone

By the Numbers

< 5s
Number provisioning time
99.9%
SMS delivery rate
< 200ms
Webhook delivery latency
3
Countries supported

Frequently Asked Questions

What makes AgentCall different from Twilio?+
AgentCall is purpose-built for AI agents while Twilio targets human developers. AgentCall offers real SIM numbers that pass platform verification, automatic OTP extraction, and per-agent isolation. Twilio's VoIP numbers are frequently blocked by services like Stripe and Google.
Can I use AgentCall for free?+
Yes. The free tier includes 1 phone number, 50 SMS per month, and 10 voice minutes at no cost. OTP webhooks are included. No credit card required. Upgrade to Pro at $19.99/month when you need more.
How fast can I provision a phone number?+
Phone numbers are provisioned in under 5 seconds via a single API call. Choose country, type (local, toll-free, mobile, SIM), and capabilities. The number is active immediately.
Do the numbers pass platform verification?+
Yes. SIM numbers ($8/month) pass strict verification from Stripe, Google, banks, and other platforms that block VoIP. Local and toll-free numbers ($2/month) work for less strict verification.
How does automatic OTP extraction work?+
When an SMS with a verification code arrives, AgentCall detects and extracts the OTP automatically. The code is delivered to your webhook endpoint instantly alongside the full message.
What programming languages are supported?+
AgentCall provides a REST API with JSON responses — it works with any language that can make HTTP requests. Python, JavaScript, Go, Rust, Java, and more. Official SDKs for Python and Node.js.

Give your agent a phone number

Start free. No credit card required. Your agent gets a real phone number in under 60 seconds.

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