Didit Phone Verification

Integrate Didit Phone Verification standalone API to verify phone numbers via OTP. Use when the user wants to verify phones, send SMS or WhatsApp or Telegram codes, check phone verification codes, detect disposable or VoIP numbers, or implement phone-based identity verification using Didit. Supports multiple delivery channels (SMS, WhatsApp, Telegram, voice), fraud signals, and policy-based auto-decline.

Didit Phone Verification API

Overview

Two-step phone verification via one-time code:

1. Send a verification code to a phone number
2. Check the code the user provides

Key constraints:

• Code expires after 5 minutes
• Maximum 3 verification attempts per code (then must resend)
• Maximum 2 resend requests within 24 hours
• Rate limit: 4 sends per hour per phone number
• Phone must be in E.164 format (e.g. [phone])
• You must call Send before Check

Delivery channels: SMS (default fallback), WhatsApp, Telegram, voice call. Falls back to SMS if preferred channel unavailable.

Capabilities: Detects disposable/temporary numbers, VoIP numbers, carrier info, and duplicate numbers. Supports fraud signals for risk scoring.

API Reference: Send Code | Check Code Feature Guide: https://docs.didit.me/core-technology/phone-verification/overview

---

Authentication

All requests require an API key via the x-api-key header.

How to obtain: Didit Business Console → API & Webhooks → Copy API key, or via programmatic registration (see below).

text

x-api-key: your_api_key_here

Getting Started (No Account Yet?)

If you don't have a Didit API key, create one in 2 API calls:

1. Register: POST https://apx.didit.me/auth/v2/programmatic/register/ with {"email": "[e-mail]", "password": "MyStr0ng!Pass"}
2. Check email for a 6-character OTP code
3. Verify: POST https://apx.didit.me/auth/v2/programmatic/verify-email/ with {"email": "[e-mail]", "code": "A3K9F2"} → response includes api_key

To add credits: GET /v3/billing/balance/ to check, POST /v3/billing/top-up/ with {"amount_in_dollars": 50} for a Stripe checkout link.

See the didit-verification-management skill for full platform management (workflows, sessions, users, billing).

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Step 1: Send Phone Code

Request

text

POST https://verification.didit.me/v3/phone/send/

Headers

Header	Value	Required
x-api-key	Your API key	Yes
Content-Type	application/json	Yes

Body (JSON)

Parameter	Type	Required	Default	Constraints	Description
phone_number	string	Yes	—	E.164 format	Phone number (e.g. [phone])
options.code_size	integer	No	6	Min: 4, Max: 8	Code length
options.locale	string	No	—	Max 5 chars	Locale for message. e.g. en-US
options.preferred_channel	string	No	"whatsapp"	See channels	"sms", "whatsapp", "telegram", "voice"
signals.ip	string	No	—	IPv4/IPv6	User's IP for fraud detection
signals.device_id	string	No	—	Max 255 chars	Unique device identifier
signals.device_platform	string	No	—	Enum	"android", "ios", "ipados", "tvos", "web"
signals.device_model	string	No	—	Max 255 chars	e.g. iPhone17,2
signals.os_version	string	No	—	Max 64 chars	e.g. 18.0.1
signals.app_version	string	No	—	Max 64 chars	e.g. 1.2.34
signals.user_agent	string	No	—	Max 512 chars	Browser user agent
vendor_data	string	No	—	—	Your identifier for session tracking

Example

python

import requests

response = requests.post(
    "https://verification.didit.me/v3/phone/send/",
    headers={"x-api-key": "YOUR_API_KEY", "Content-Type": "application/json"},
    json={
        "phone_number": "[phone]",
        "options": {"preferred_channel": "sms", "code_size": 6},
        "vendor_data": "session-abc-123",
    },
)

typescript

const response = await fetch("https://verification.didit.me/v3/phone/send/", {
  method: "POST",
  headers: { "x-api-key": "YOUR_API_KEY", "Content-Type": "application/json" },
  body: JSON.stringify({
    phone_number: "[phone]",
    options: { preferred_channel: "sms", code_size: 6 },
  }),
});

Status Values & Handling

Status	Meaning	Action
"Success"	Code sent	Wait for user to provide code, then call Check
"Retry"	Temporary issue	Wait a few seconds and retry (max 2 retries)
"Undeliverable"	Number cannot receive messages	Inform user. Try a different number
"Blocked"	Number blocked (spam)	Use a different number

Error Responses

Code	Meaning	Action
400	Invalid request body	Check phone format (E.164) and parameters
401	Invalid or missing API key	Verify x-api-key header
403	Insufficient credits/permissions	Check credits in Business Console
429	Rate limited (4/hour/number)	Wait for cooldown period

---

Step 2: Check Phone Code

Must be called after a successful Send. Optionally auto-declines risky numbers.

Request

text

POST https://verification.didit.me/v3/phone/check/

Body (JSON)

Parameter	Type	Required	Default	Values	Description
phone_number	string	Yes	—	E.164	Same phone used in Step 1
code	string	Yes	—	4-8 chars	The code the user received
duplicated_phone_number_action	string	No	"NO_ACTION"	"NO_ACTION" / "DECLINE"	Decline if already verified by another user
disposable_number_action	string	No	"NO_ACTION"	"NO_ACTION" / "DECLINE"	Decline disposable/temporary numbers
voip_number_action	string	No	"NO_ACTION"	"NO_ACTION" / "DECLINE"	Decline VoIP numbers

Example

python

response = requests.post(
    "https://verification.didit.me/v3/phone/check/",
    headers={"x-api-key": "YOUR_API_KEY", "Content-Type": "application/json"},
    json={
        "phone_number": "[phone]",
        "code": "123456",
        "disposable_number_action": "DECLINE",
        "voip_number_action": "DECLINE",
    },
)

Response (200 OK)

json

{
  "request_id": "e39cb057-...",
  "status": "Approved",
  "message": "The verification code is correct.",
  "phone": {
    "status": "Approved",
    "phone_number_prefix": "+1",
    "phone_number": "4155552671",
    "full_number": "[phone]",
    "country_code": "US",
    "country_name": "United States",
    "carrier": {"name": "ATT", "type": "mobile"},
    "is_disposable": false,
    "is_virtual": false,
    "verification_method": "sms",
    "verification_attempts": 1,
    "verified_at": "2025-08-24T09:12:39.662232Z",
    "warnings": [],
    "lifecycle": [...]
  }
}

Status Values & Handling

Status	Meaning	Action
"Approved"	Code correct, no policy violations	Phone verified — proceed
"Failed"	Code incorrect	Ask user to retry (up to 3 attempts)
"Declined"	Code correct but policy violation	Check phone.warnings for reason
"Expired or Not Found"	No pending code	Resend via Step 1

---

Response Field Reference

phone Object

Field	Type	Description
status	string	"Approved", "Failed", "Declined"
phone_number_prefix	string	Country prefix (e.g. +1)
full_number	string	Full E.164 number
country_code	string	ISO 3166-1 alpha-2
carrier.name	string	Carrier name
carrier.type	string	"mobile", "landline", "voip", "unknown"
is_disposable	boolean	Disposable/temporary number
is_virtual	boolean	VoIP number
verification_method	string	"sms", "whatsapp", "telegram", "voice"
verification_attempts	integer	Check attempts made (max 3)
warnings	array	{risk, log_type, short_description, long_description}

---

Warning Tags

Tag	Description	Auto-Decline
VERIFICATION_CODE_ATTEMPTS_EXCEEDED	Max code attempts exceeded	Yes
PHONE_NUMBER_IN_BLOCKLIST	Phone is in blocklist	Yes
HIGH_RISK_PHONE_NUMBER	Identified as high risk	Yes
DISPOSABLE_NUMBER_DETECTED	Temporary/disposable number	Configurable
VOIP_NUMBER_DETECTED	VoIP number detected	Configurable
DUPLICATED_PHONE_NUMBER	Already verified by another user	Configurable

---

Common Workflows

Basic Phone Verification

text

1. POST /v3/phone/send/   → {"phone_number": "[phone]"}
2. Wait for user to provide the code
3. POST /v3/phone/check/  → {"phone_number": "[phone]", "code": "123456"}
4. If "Approved"            → phone is verified
   If "Failed"              → retry (up to 3 attempts)
   If "Expired or Not Found"→ resend (step 1)

Strict Security Verification

text

1. POST /v3/phone/send/   → include signals.ip, signals.device_platform, channel: "sms"
2. POST /v3/phone/check/  → set disposable_number_action + voip_number_action to "DECLINE"
3. If "Declined" → check phone.warnings, block or warn user

---

Utility Scripts

bash

export DIDIT_API_KEY="your_api_key"

python scripts/verify_phone.py send [phone] --channel sms
python scripts/verify_phone.py check [phone] 123456 --decline-voip