Awesome AI Agent Verification

A curated list of tools, libraries, and resources for phone verification in AI agent workflows.

AI agents increasingly need phone verification to create accounts, pass 2FA, and access phone-gated services. This list catalogs every solution available — from real SIM providers to VoIP APIs to open-source libraries.

Contents

• Why This Matters
• Real SIM Providers
• VoIP / Virtual Number APIs
• Open Source Libraries
• MCP Servers
• SDKs & Client Libraries
• Browser Automation + Verification
• OTP / 2FA Libraries
• Temporary Number Services
• Articles & Guides
• Communities
• Related Awesome Lists

Why This Matters

Most services now detect and block VoIP numbers during phone verification:

Service	Blocks VoIP?	Detection Method
Stripe	✅ Yes	Carrier lookup (LERG)
Google	✅ Yes	HLR query
WhatsApp	✅ Yes	Carrier type check
Microsoft	✅ Yes	Reputation scoring
Banks	✅ Yes	Multiple methods
Discord	❌ No	Basic validation
GitHub	❌ No	Format only

AI agents need real mobile numbers that pass these checks.

Real SIM Providers

Providers that offer actual SIM-backed mobile numbers (pass carrier lookup as "mobile"):

Provider	Pricing	MCP Support	API	Countries	Notes
AgentSIM	$0.99/session	✅ Native	REST + SDK	US	Real T-Mobile SIM, built for AI agents, 10 free/month
VoidMob	$0.15+/SMS	✅ MCP	REST	US, UK	Real 4G/5G carrier SIMs, per-use pricing, also offers proxies + eSIMs
JoltSMS	$50/mo+	❌	REST	US	Enterprise focused, higher volume
GetSMSCode	Per-use	❌	REST	Multiple	Physical SIM bank, variable availability
5SIM	Per-use	❌	REST	Multiple	Mix of real and virtual numbers
SMSPool	Per-use	❌	REST	Multiple	Marketplace model, quality varies
VirtualSMS	$0.05+/use	✅ Native MCP	REST + WebSocket	145+	Real SIM cards, 700+ services, WebSocket push OTP delivery

Agent Phone Platforms

Full phone infrastructure for AI agents (calls + SMS, not verification-focused):

Provider	Pricing	Features	Verification?
AgentPhone	Free to start	Voice + SMS webhook, real-time transcription, MCP	⚠️ Numbers likely fail carrier lookup
Vapi	Per-minute	Voice AI agents, low latency	No verification focus
Bland AI	Per-minute	Enterprise phone agents	No verification focus
Retell AI	Per-minute	Conversational voice AI	No verification focus

VoIP / Virtual Number APIs

⚠️ These provide VoIP numbers that may be blocked by major services:

Provider	Pricing	Best For	Limitation
Twilio	$1-5/number + usage	SMS/Voice apps	Detected as VoIP by most services
Vonage	Per-use	Enterprise comms	VoIP classification
Plivo	Per-use	Bulk messaging	VoIP classification
Bandwidth	Per-use	Enterprise	Some numbers pass as mobile
Telnyx	Per-use	Developer-friendly	VoIP classification
MessageBird	Per-use	Global coverage	Most numbers are VoIP
Sinch	Per-use	Verification APIs	VoIP classification

Open Source Libraries

Phone Verification for Agents

Repository	Stars	Language	Description
transitive-bullshit/sms-number-verifier	215	JavaScript	SMS verification for automated systems
Shelex/free-otp-api	20	TypeScript	Aggregates free phone numbers for OTP testing

OTP Servers

Repository	Stars	Language	Description
knadh/otpgateway	463	Go	Standalone OTP verification with pluggable providers
CuriousLearner/django-phone-verify	292	Python	Django phone verification via SMS
TheBund1st/daming	94	Java	SMS verification for Spring Boot

Mobile OTP UI Components

Repository	Stars	Language	Description
faizalshap/react-native-otp-verify	278	Java	React Native SMS verification
kfit-dev/OTPTextField	67	Obj-C	iOS OTP input field
pushpalroy/ComposeOtpVerify	55	Kotlin	Android Jetpack Compose OTP

TOTP / Authenticator Libraries

Repository	Stars	Language	Description
pyauth/pyotp	3.3K	Python	TOTP/HOTP one-time password library. RFC 4226/6238. Google Authenticator compatible.

MCP Servers

Model Context Protocol servers for phone verification in Claude, Cursor, and other MCP clients:

Server	Provider	Tools	Description
AgentSIM MCP	AgentSIM	provision_number, wait_for_otp, get_messages, release_number, list_numbers	Real SIM numbers via MCP — Claude Code, Cursor, Windsurf. Remote option via mcp.agentsim.dev
JoltSMS MCP	JoltSMS (community)	joltsms_provision_number, joltsms_wait_for_sms, joltsms_get_latest_otp	Community MCP wrapper for JoltSMS real-SIM numbers
VirtualSMS MCP	VirtualSMS	buy_number, wait_for_code, check_sms, cancel_order, swap_number	Real SIM, 145+ countries, WebSocket push OTP

SDKs & Client Libraries

Official client libraries for programmatic phone verification in AI agents:

Library	Language	Install	Description
agentsim-python	Python	pip install agentsim-sdk	Async/sync context managers, auto-reroute, webhook support
agentsim-typescript	TypeScript	npm install @agentsim/sdk	Zero dependencies. Node.js 18+, Bun, Deno, Edge runtimes
agentsim-mcp	Python	uvx agentsim-mcp	MCP server for Claude Code, Cursor, Windsurf. Remote option at mcp.agentsim.dev

Browser Automation + Verification

Tools for combining browser automation with phone verification:

Tool	Stars	Description	Phone Support
Puppeteer	94K+	Chrome/Firefox automation	No native phone support
Playwright	85K+	Cross-browser automation	No native phone support
browser-use	84.8K+	AI browser automation	Needs external phone provider
Stagehand	21.7K	AI-native browser automation — act(), extract(), observe(). CDP-based v3.	Needs external phone provider
Skyvern	21K+	CV+LLM browser automation	No native phone support
Steel	6.7K	Open source browser sandbox. Session management, proxy rotation, stealth.	No native phone support
agent-browser	6.2K	Headless browser CLI for AI agents. Accessibility-tree snapshots. Rust+Node.js.	No native phone support
Notte	1.9K	Stealth browser for agents	Built-in personas, VoIP numbers

Temporary Number Services

⚠️ Shared/public numbers — NOT suitable for production:

Service	Type	Reliability	Notes
Quackr	Free shared numbers	Low	Numbers shared publicly, codes visible to all
Receive-SMS-Free	Free shared numbers	Very Low	Frequently blocked
TextNow	Free VoIP	Low	Blocked by most major services
Google Voice	Free VoIP	Low	Ironically blocked by Google services

Articles & Guides

Technical Deep Dives

• Why Your AI Agent's Phone Number Gets Blocked - Comprehensive VoIP blocking explainer with code
• How to Automate 2FA and Account Creation - NotteLabs guide on agent identity
• Building AI Agents That Handle 2FA - VoidMob's SMS verification guide
• The Agentic Browser Landscape in 2026 - Overview of agent browser tools
• Setting up 2FA Testing with Playwright - Testing automation guide

Industry Reports

• AI Agents Market: $7.6B → $10.9B in 2026 - Market size and growth
• Reddit Implements Human Verification - Verification requirements increasing

Communities

Where developers discuss phone verification for AI agents:

Reddit

Subreddit	Members	Focus
r/AI_Agents	325K+	AI agent building and tooling
r/mcp	75K+	Model Context Protocol
r/MCPservers	15K+	MCP server discovery
r/LLMDevs	136K+	LLM development
r/ClaudeCode	Growing	Claude Code development
r/automation	200K+	General automation

Discord

Server	Members	Focus
MCP Discord	11.5K+	MCP ecosystem
CrewAI	8K+	Multi-agent systems
n8n	50K+	Workflow automation
Vapi	Growing	Voice AI agents

Forums

Forum	Members	Focus
n8n Community	50K+	OTP/SMS workflows
CrewAI Forum	10K+	Agent orchestration
mcpservers.org	Growing	MCP server discovery

How Carrier Lookup Works

When a phone number is submitted for verification, services query databases like LERG (Local Exchange Routing Guide) and NPAC (Number Portability Administration Center):

// VoIP number (BLOCKED)
{
  "phone_number": "+16505551234",
  "carrier": "Twilio Inc.",
  "line_type": "voip",
  "mobile_country_code": "311"
}

// Real SIM number (ACCEPTED)
{
  "phone_number": "+14155551234",
  "carrier": "T-Mobile USA",
  "line_type": "mobile",
  "mobile_network_code": "026"
}

Contributing

Contributions welcome! Please read the contribution guidelines first.

• Add new tools via Pull Request
• Keep descriptions factual and concise
• Include pricing and limitation info
• Verify links are working

License

This list is released under CC0. To the extent possible under law, the author has waived all copyright and related rights to this work.