Trestle - Identity Data Enrichment and Validation APIs Trestle - Identity Data Enrichment and Validation APIs Trestle - Identity Data Enrichment and Validation APIs Trestle - Identity Data Enrichment and Validation APIs
  • Products
        • Enrichment

        • Reverse Phone APIGLOBAL
        • Verify and enrich phone numbers
        • Reverse Address API
        • Verify and enrich address information
        • Caller Identification API
        • Identify and enrich caller information
        • Add-Ons

        • Litigator Check
        • Identify phone numbers associated with serial litigators
        • Email Deliverability
        • Confirm email inboxes accept mail in real-time
        • Spam Check
        • Flag phone numbers tied to high-risk calling activity
        • Email Age Score
        • Score how long an email has existed
        • Validation & Verification

        • Phone Validation APIGLOBAL
        • Validate phone numbers and identify disconnected numbers
        • Real Contact API
        • Verify phone, email, and address information
        • Address Validation API
        • Validate and normalize addresses
        • Assess Risk

        • Decision Console
        • Optimize identity verification for manual review
        • Decision Signals API
        • Automate identity verification for risk decisioning
        • Start using Trestle products today

          Get started for free—no credit card required

          Start Your Free Trial

  • Solutions
        • Industries

        • B2B Contact Data
        • eCommerce
        • Insurance
        • Lead Generation
        • Real Estate
        • Communications
        • Use Cases

        • Verify and Prioritize Leads
        • Outbound Dialing Optimization
        • Assess Risk And Prevent Fraud
        • Inbound Call Routing and Verification​
        • Signup and Onboarding​
        • Optimize AI Voice Agents
        • Start using Trestle products today

          Get started for free—no credit card required

          Start Your Free Trial

  • Pricing
  • Resources
        • API Documentation
        • Blog
        • Knowledge Base
        • Case Studies
        • Glossary
        • Partners and Integrations
  • Company
        • About Us
        • Why Trestle
        • Careers
        • Affiliate Program
        • Contact
  • Log In
  • Start for Free

Trestle Overview

19
  • Does Trestle Offer DNC Checks?
  • Does Trestle Have a Sandbox Environment To Test Integrations?
  • What is Trestle’s Coverage and Accuracy?
  • Which Countries’ Data Do You Have?
  • Does Trestle Normalize Phone Number Format?
  • How Do You Integrate Trestle’s APIs?
  • How Does Trestle’s API Pricing Work?
  • How Often is Trestle’s Data Updated?
  • How to Properly Sample a Test File and Evaluate Trestle
  • Understanding NPA-NXX and the Implications of Number Portability
  • Understanding Trestle’s Free API Trial and the API Access Request Process for Specific Products
  • What are the Response Times for Trestle’s APIs?
  • What are the Various Sources of Trestle’s Identity Data?
  • What are Trestle’s SLAs?
  • What Demographic Data Does Trestle Have?
  • What Is Our Global Phone Validation Coverage?
  • What is the Default and Max QPS Supported?
  • What Queries are Billable?
  • What Security Measures are Taken by Trestle?

Product Features

39
  • Everything to Know About Source ID
  • Everything to Know About IP Trust Scores
  • How to Check When an Email Address Was Made
  • Everything to Know About Spam Checks
  • Using IP Intelligence Checks to Verify Lead Legitimacy in Real Contact API
  • Everything to Know About Phone-to-Address Match
  • Real Contact API 1.1 vs. Real Contact API 2.0: What’s Changed and How to Upgrade
  • Everything to Know About Phone Activity Score
  • Everything to Know About Real Contact API 2.0
  • How Trestle’s Activity Score is Different From HLR Lookups
  • Everything To Know About Name Match Details
  • Everything To Know About Phone-to-Name Confidence Score
  • Everything To Know About Litigator Checks
  • Everything To Know About the Email Age Score Add-on
  • Everything To Know About the Email Deliverability Add-on
  • Explain Real Contact API Grading
  • Fine-Tuning Find Person API Results
  • How Can Trestle’s Email Data Be Used?
  • How Do I Determine Phone Validity?
  • How Do You Read Trestle’s Phone Activity Score?
  • How Does Our Real Contact API Name Matching Work?
  • How Does Trestle Assess Email Validity in Real Contact?
  • How is Trestle’s Phone Activity Score Calculated?
  • How To Read the Real Contact Data Assessment Report
  • International Reverse Phone API Explained
  • Line Type Fidelity and Confidence
  • Trestle API Response Attribute Ranking
  • Trestle Warnings – A Comprehensive Guide
  • Understanding the Difference: Phone Validity vs. Trestle’s Activity Score
  • What are the Different Address Types Returned by Trestle?
  • What Does a Name Match of Null Mean?
  • What Does the Carrier Name Mean?
  • What is the Difference Between CNAM and Trestle’s Smart CNAM API?
  • What is the Difference Between Fixed VoIP and Non-fixed VoIP?
  • What is the Difference Between Reverse Phone API, Caller Identification API, and Smart CNAM API?
  • What is the Link Date Associated with Phones and Addresses?
  • Why and When to Use Trestle’s Name Hint
  • Why Do We Return a Maximum of 100 Entities in Find Person API?
  • Why Does the Address Return as Invalid?

Integrations

22
  • HubSpot | Phone Validation App Integration Guide
  • ZoomInfo | Phone Validation, Real Contact, and Reverse Phone Integration Guide
  • Databar | Phone Validation Integration Guide
  • Make | Real Contact API Integration Guide
  • Make | Phone Validation API Integration Guide
  • Apollo | Phone Validation Integration Guide
  • HighLevel | Phone Validation Integration Guide
  • boberdoo | Real Contact API Integration Guide
  • Clay | Validate Phone Number Integration Guide
  • Clay | Verify Contact Integration Guide
  • HubSpot | Real Contact Phone Grading App Integration Guide
  • How Do I Use a HubSpot List To Grade My Contacts?
  • How Do I Use HubSpot Workflow Triggers To Grade My Contacts?
  • Lead Prosper | Phone Validation Integration Guide
  • Lead Prosper | Real Contact Integration Guide
  • Reverse Phone API Enrichment of Leads in Google Sheets via Zapier
  • Snowflake | Phone Validation Integration Guide
  • What is the Phone Validation Integration within ActiveProspect?
  • What is the Real Contact Integration within ActiveProspect?
  • Validate and Verify Leads with Trestle’s Phone Validation API in Sierra Interactive via Zapier
  • Validate Leads with Trestle’s Phone Validation API in LeadConnector via Zapier
  • Zapier | Grade Leads from a Google Sheet with Real Contact

Troubleshooting

9
  • How to Prevent 429 Errors by Sizing API Concurrency to Your QPS Limit
  • How to Fix 403 Forbidden Errors When Using Trestle’s APIs
  • Why Won’t My Email Work to Signup for Trestle?
  • Ruby Integrations: 403 Forbidden Errors
  • Getting 429: Too Many Requests Error – Why?
  • How to Remove or Deactivate a User in Trestle’s Developer Portal
  • How to Update Phone to Name/Address Linkage Records
  • Reviewing Usage Data
  • Why is the Name Associated with the Phone Incorrect?

Developer Portal

8
  • Business Verification Failed? Here’s What Documents You Need to Submit
  • How to Find and Download Your Receipt or Invoice
  • How to Monitor API Errors With Your Usage Graph
  • Batch Upload FAQ
  • Developer Portal Wallet Frequently Asked Questions
  • Export and Analyze Your Queries in Your Developer Portal Account
  • Getting Started with Trestle’s Developer Portal Wallet
  • Making Changes to Billing Settings for the Developer Portal Wallet

User Guides

9
  • Phone Validation in Java
  • Batch Upload Instructions
  • How Do I add Additional Members to My Trestle Account?
  • How to Handle Special Characters in API Queries
  • Phone Validation API with ASP.NET
  • Phone Validation with JavaScript and HTML: Leveraging Trestle’s API
  • Phone Validation API with PHP: Leveraging Trestle’s API
  • Phone Validation API with Python
  • Phone Validation API with React

Telephony Knowledge

9
  • Choosing the Right Number Lookup API
  • How to Identify Callers In Real-Time Using a Reverse Phone API
  • Why is Line Type Intelligence Important?
  • What is a “No Routes Found” Phone Message?
  • The Best Phone Validation API for Call Centers
  • How to Identify Disconnected Phone Numbers Automatically
  • What is a Phone Number Reputation Lookup?
  • What is a Carrier Number?
  • What is a Non-Fixed VoIP Phone?

Risk Suite Overview

8
  • How to Read Email Breach Reports and IP Abuse Reports in Decision Console
  • Everything to Know About Decision Signals API
  • How to Get Started With Decision Console
  • What is the Decision Overview and How Do I Read It?
  • What is an Attribute Card and How Do I Read It?
  • What is Link Builder and How Do I Use It?
  • Understanding Team and Account Management
  • FAQ and Troubleshooting: Decision Console
  • Home
  • Knowledge Base
  • Integrations
  • Clay | Verify Contact Integration Guide
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Clay | Verify Contact Integration Guide

5 min read

Trestle’s Verify Contact Integration Guide for Clay provides instructions on using our Real Contact API from your Clay table. This integration allows you to verify contacts, identify connected/disconnected phone lines, and grade contacts based on the likelihood of connecting.

The Verify Contact can be queried directly through Clay, or you can sign up with Trestle and add your API key to Clay.

Please Note: Available for U.S. only

Getting Started #

To get started, login to your Clay account and select the table where you want to verify contacts.

Click the blue “Add Enrichment” button or “Add Column” > then “Add Enrichment.”

Search “Trestle” to see the enrichment options.

Verify Contact (Three Clay credits per contact)

This option queries our Real Contact API and allows you to provide name + phone number and email address. It will provide contact grades based on if the name provided matches the phone number + email address. We will also return a Phone Activity Score and phone metadata like line type (e.g., mobile, landline, fixed or non-fixed VoIP, etc.).

Also available is:

Validate Phone Number (One Clay credit per number)

This option queries our Phone Validation API and allows you to validate phone numbers, returning an activity score to determine active vs inactive phone lines and phone metadata like line type (e.g., mobile, landline, fixed or non-fixed VoIP, etc.).

For Validate Phone Number instructions, please visit the guide.

Verify Contact #

Once “Verify Contact” has been selected, this window will pop up.

Account:

Select if you would like to use a Clay-managed Trestle account (3 credits per contact) OR if you would like to bring your own API key from Trestle.
If you would like to use your own Trestle API key, click the dropdown menu under “Select Trestle Account.”

Click “Add Account.”

Then paste in your API key from Trestle which can be found on the Developer Portal.

Name your API key and click “Save.”

Setup Inputs #

For Verify Contact, there are two required input fields: Name and Phone Number.

Name requires first + last name in the same column. The API will not provide name matching if only a first or last name is provided.

Click the Full Name dropdown and select the column where the name is located.

Click the “Phone Number” dropdown and select the column where the phone number is located.

Repeat steps for each of the additional fields you would like to include in the input.

Phone Activity Score (Optional)

This field allows you to select which Activity Score dispositions you would like to be considered valid/good phone numbers.

The Phone Activity Score ranges from 0-100 and is a confidence level that a phone number is active or inactive.

Select “Good” if you would only like the highest confidence numbers to be marked as valid.

Select “Good and Uncertain” if you would like both highest confidence numbers and uncertain confidence numbers to be marked as valid.

We recommend selecting Good and Uncertain; otherwise, you may filter out some good phone numbers.

Mobile Phone Only

This field allows you to select if only mobile phone numbers should be considered valid. If you would like to filter out landline, VoIP, toll-free, etc., click this toggle to enable.

Once these steps are complete, click “Continue to add fields.”

Add Data as Columns to Your Table #

Select which data outputs you would like added as a column:

  • Phone Is Valid: This field checks phone number syntax and if the number is assigned to a carrier. Phone Activity Score and Mobile Phone Only settings will impact if a number returns valid or invalid.
  • Phone Activity Score: A score range of 0-100 based on past 12 months of phone activity.
  • Phone Line Type: Line type indicating if the phone is landline, mobile, fixed or non-fixedVoIP, toll-free, etc.
  • Phone Name Match: The contact name provided is associated with the phone number provided
  • Phone Contact Grade: An A-F grade based on how contactable the phone number is. More details on contact grading can be found in this knowledge base article.
  • Email Is Valid: Is the email address provided valid?
  • Email Contact Grade: An A-F grade based on how contactable the email address is. 

Once you have selected the fields you would like returned in the response, click “Save.” Once saved, these columns will be added automatically to your table.

Run the Query #

Once your columns have been added, it is time to run the query. Select the “Play” button in the cell to run a single line, or select the “Play” button in the column header to run the whole column.

Troubleshooting #

Number Format Incorrect #

Clay does not currently have a cell format specifically for phone numbers. It is recommended that each column containing a phone number be set to “Data Type” or “Text.” This will maintain the phone number format. Whereas, if “Data Type” is “Number” the phone number format will include commas (i.e., 1,112,223,334).

Response Columns Don’t Populate #

On occasion, you may find that the response columns you added do not automatically populate with the response data. This is an easy fix:

  1. Select the cell beneath the Verify Contact header. This will open a cell details page.
  2. Select the field that is not populating. This will open a mapping window.
  3. In the mapping window, you will see a list of your existing columns. Select the column that corresponds to the data field you need to populate.
  4. Repeat for all data fields that are not populating.

Support #

Should you have any issues with the app or questions about installation, please contact support@trestleiq.com or schedule a call with us to review.

Updated on February 25, 2026
Clay | Validate Phone Number Integration GuideHubSpot | Real Contact Phone Grading App Integration Guide
Table of Contents
  • Getting Started
  • Verify Contact
  • Setup Inputs
  • Add Data as Columns to Your Table
  • Run the Query
  • Troubleshooting
    • Number Format Incorrect
    • Response Columns Don’t Populate
  • Support
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Global coverage for phone validation and reverse phone.

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Company

  • About Us
  • Why Trestle
  • Careers
  • Affiliate Program
  • Contact

Products

  • Reverse Phone API
  • Reverse Address API
  • Caller Identification API
  • Phone Validation API
  • Real Contact API
  • Address Validation API
  • Batch Upload
  • Litigator Check Add-on
  • Free Lead Assessment

Use Cases

  • Outbound Dialing Optimization
  • Inbound Call Routing and Verification
  • Signup and Onboarding
  • Lead Verification
  • Optimize AI Voice Agents

Resources

  • Blog
  • Knowledge Base
  • Case Studies
  • Glossary
  • Data Dictionary
  • Changelog
  • Partners and Integrations

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Trestle - Identity Data Enrichment and Validation APIs
  • Products
        • Enrichment

        • Reverse Phone APIGLOBAL
        • Verify and enrich phone numbers
        • Reverse Address API
        • Verify and enrich address information
        • Caller Identification API
        • Identify and enrich caller information
        • Add-Ons

        • Litigator Check
        • Identify phone numbers associated with serial litigators
        • Email Deliverability
        • Confirm email inboxes accept mail in real-time
        • Spam Check
        • Flag phone numbers tied to high-risk calling activity
        • Email Age Score
        • Score how long an email has existed
        • Validation & Verification

        • Phone Validation APIGLOBAL
        • Validate phone numbers and identify disconnected numbers
        • Real Contact API
        • Verify phone, email, and address information
        • Address Validation API
        • Validate and normalize addresses
        • Assess Risk

        • Decision Console
        • Optimize identity verification for manual review
        • Decision Signals API
        • Automate identity verification for risk decisioning
        • Start using Trestle products today

          Get started for free—no credit card required

          Start Your Free Trial

  • Solutions
        • Industries

        • B2B Contact Data
        • eCommerce
        • Insurance
        • Lead Generation
        • Real Estate
        • Communications
        • Use Cases

        • Verify and Prioritize Leads
        • Outbound Dialing Optimization
        • Assess Risk And Prevent Fraud
        • Inbound Call Routing and Verification​
        • Signup and Onboarding​
        • Optimize AI Voice Agents
        • Start using Trestle products today

          Get started for free—no credit card required

          Start Your Free Trial

  • Pricing
  • Resources
        • API Documentation
        • Blog
        • Knowledge Base
        • Case Studies
        • Glossary
        • Partners and Integrations
  • Company
        • About Us
        • Why Trestle
        • Careers
        • Affiliate Program
        • Contact
  • Log In
  • Start for Free