Phone Validation API: How to Integrate Into Your Marketing Stack

Integrating phone validation into your marketing stack means every phone number entering your CRM, landing pages, or outbound campaigns is automatically checked for validity, line type and carrier — and screened for DNC with DNC Lookup — before it costs you anything.

Why API Integration Beats Manual Validation

Manual DNC scrubbing before a campaign is a step in the right direction, but it is inherently reactive — it addresses phone numbers after they are already in your database. API integration shifts this to a proactive model: every incoming number is validated at the moment of capture, so bad data never enters your system in the first place.

The best results come from doing both: validate at intake so bad numbers never get in, and scrub again before each campaign, because numbers can become invalid — or land on a DNC list — between capture and campaign.

The Phone Validation API: What You Need to Know

The RealValidito Phone Lookup API uses a simple POST endpoint authenticated with your API key and secret. No OAuth, no sessions — just your credentials and up to 1,000 numbers per request. The response is JSON. DNC Lookup (/dnclookup/validate) works the same way, and the Phone + DNC Lookup API (/lookups/validate) returns both results for each number in one call. Full documentation: RealValidito API docs.

POST https://app.realvalidito.com/phonelookup/validate
api_key=your_key
api_secret=your_secret
numbers[]=5125550123      (10 digits, up to 1,000 numbers)

// Response (shortened):
{
  "status": "success",
  "512*******": {
    "status": "Valid",
    "phone_number": "+1512*******",
    "national_format": "(512) ***-****",
    "number_type": "Mobile",
    "zip": "78701",
    "city": "AUSTIN",
    "state": "TX",
    "country": "US",
    "timezone": "CST (America/Chicago)",
    "network_name": "CELLCO PARTNERSHIP DBA VERIZON",
    "network_type": "WIRELESS",
    "network_domain": "512*******@vtext.com"
  }
}

Integration Patterns by Platform Type

Landing Page / Web Form Integration

Validate at form submission before the lead is written to your CRM. On your backend (PHP, Node.js, Python), call the validation API when the form POSTs, and conditionally proceed with lead creation based on the result:

// Python Flask example (simplified)
@app.route('/submit', methods=['POST'])
def submit_lead():
    phone = request.form['phone']
    res = phone_lookup(phone)       # calls the RealValidito Phone Lookup API
    if res['status'] != 'Valid':
        return jsonify({'error': 'Please check your phone number'}), 400
    lead['line_type'] = res['number_type']
    lead['dnc'] = dnc_lookup(phone)   # optional: DNC Lookup before any telemarketing
    save_to_crm(lead)
    return jsonify({'success': True})

CRM Integration (Webhook / Automation)

Most CRM platforms (HubSpot, Salesforce, Zoho and others) support workflow automation that can call an external API when a contact is created or updated. RealValidito also offers ready-made connections for GoHighLevel and Zapier. Configure a workflow that:

1. Triggers when a new contact with a phone number is added
2. Calls the RealValidito API with the contact’s phone number
3. Writes the number_type, network_name, timezone and DNC results back to the contact record as custom fields
4. Applies a tag or list membership based on the result (e.g., “Mobile”, “DNC — Suppressed”)

Outbound Dialer Integration

For call centres using predictive dialers (Five9, NICE CXone, Genesys, PhoneBurner), integrate phone validation into the list import or lead refresh step. Before any list is loaded into the dialer, run a batch validation via CSV upload or the API, remove Invalid numbers, and suppress numbers that DNC Lookup marks as Federal (National) DNC or TCPA Litigator. Agents then spend their time on valid numbers.

SMS Platform Integration

Before uploading a contact list to your SMS platform (Klaviyo, Attentive, Postscript, SMSBump), run a validation pass and keep only records where number_type = "Mobile" and the DNC status is cleaned — the “Clean mobiles” download in Phone + DNC Lookup gives you exactly that. You stop paying to text landlines and invalid numbers.

Monitoring Credit Usage

Track your API credit consumption programmatically to avoid running out mid-campaign:

GET https://app.realvalidito.com/phonelookup/getcredits/{api_key}/{api_secret}
// Returns your remaining Phone Lookup credits.
// DNC Lookup has its own endpoint: /dnclookup/getcredits/{api_key}/{api_secret}

Add a credit check to your automation’s health monitoring — alert when credits fall below a threshold so you can purchase additional credits before disrupting validation workflows. Credits never expire, so buying ahead is safe. RealValidito also emails you automatically when credits run low.