Phone Verification

Phone Verification API — Instant OTP at Global Scale

Verify users globally with OTP via SMS, Voice, or WhatsApp. Built-in fraud detection, number intelligence, and 98% delivery rates.

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Key benefits

98% delivery rate

Intelligent channel failover, carrier-optimized routing, and direct operator connections maximize OTP delivery.

SMS, Voice & WhatsApp

Choose your verification channel per user — or let CloudVNO pick the best option automatically with smart fallback.

Built-in fraud scoring

Every verification request is scored using IP intelligence, device fingerprinting, and velocity checks to block abuse.

Under 3 seconds

Median OTP delivery in under 3 seconds globally. Automatic retry and escalation keeps conversions high.

GDPR & privacy compliant

Codes are never stored in plaintext. PII is handled in compliance with GDPR, CCPA, and local data-residency laws.

Global coverage

Reach users in 200+ countries and territories. Localized sender IDs and templates for each market.

How it works

Start

Start a verification

POST to /v1/verify/send with the phone number and channel. CloudVNO generates a secure OTP and delivers it to the user.

Receive

User receives the code

The user receives a one-time code via their chosen channel. Codes are time-limited (configurable 1–10 minutes) and single-use.

Check

Check the code via API

POST the code entered by the user to /v1/verify/check. Get back approved or denied in milliseconds. No state management required.

Code example

from cloudvno import Client

client = Client("YOUR_API_KEY")

# Step 1: Send OTP to the user
verification = client.verify.send(
    to="+12125559876",
    channel="sms",          # "sms" | "voice" | "whatsapp"
    locale="en",
)
print(f"Verification SID: {verification.sid}")
print(f"Status: {verification.status}")  # pending

# Step 2: Check the code the user entered
check = client.verify.check(
    to="+12125559876",
    code="123456",           # code entered by user
)
print(f"Valid: {check.valid}")       # True / False
print(f"Status: {check.status}")    # approved / denied