Buy & Sell Leads

How To Get Unlimited Access To The #1 Tool That Helps You Buy & Sell Leads At Scale In 2025

What

  • Build Lists: Simple upload or API's that make collecting any data type easy.
  • Data Validation: We're the number one email and phone validation service around.
  • Lead Routing: The easiest lead routing solution that lets you build and change on the fly.

Why

  • Proven: We've delivered the most reliable lead technology system for over 11 years.
  • Zero Tech: You can run 98% of the lead business without needing tech guys.
  • Affordable: We give you enterprise level lead solutions for half the price of big corporate brands.
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>> 90 Day Money Back Guarantee <<

Book a call to see how the Listflex software can fulfill every need your company could possibly want when collecting or selling leads, and we’ll let you test drive the system for 90 days at $500/Month with no risk!

We guarantee you’ll see how much more money there is in data, with fewer problems, and never look back!

“Using Listflex has done one thing that every entrepreneur looks for, it has given me more time. With the features and options already placed in the platform, it has simplified the workflow of my lead company. I highly recommend this system for anyone that deals with data.”

– Paul S

Collect

  • Easy Custom Fields
  • Advanced Sell Rules
  • Your Suppression
  • Listflex Suppression
  • Phone Validation
  • Email Validation
  • TCPA Filter
  • Address Validation
  • Block Domains
  • Validate IP's
  • Auto Geo Complete
  • Block Bad Words
  • Gender Complete
  • Real Time Appending
  • Require Fields
  • Block Bad Countries

Send

  • Real Time or Daily
  • Custom Integrations
  • Time Delay Sending
  • Overall Order Caps
  • Daily Caps
  • Throttle Leads
  • Cost Accounting
  • Client de-dupe
  • Email Seeding
  • Multi-List Sending
  • Email Validation
  • Day Scheduling
  • Geo Filters
  • Custom Field Filters
  • RL Filters
  • ISP Email Filters
Book A 15 Minute Demo

** Money Back Guarantee & How It Works: If after 90 days you’re unsatisfied for any reason, we will refund the monthly minimum of $500 for a maximum potential total of $1,500.00. If you were to exceed $500/month from imported leads (up to 500,000), or choose to use optional paid 3rd party services like data appending, phone validation or email validation, those fees (additional leads or add-ons) are separate and non-refundable.

Building APIs Inside Lisflex

ListFlex Lead Generation API's

The following integration examples are below:
Getresponse
Getresponse API V3
Adopia
Maropost
Constant Contact
Reachmail
Sendlane
Interspire
Email Leads Individually
Active Campaign
Mailwizz
Emurcury
Market Hero
Drip.com
ConvertKit
Ontraport
Imnica Mail
SendShark

Getresponse Example.

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint 
http://api.listflex.com/getresponsewrapper.php
Post Variables *
 
apikey=<your_api_key>&campaign=<your_campaign>&email=%%email%%&fname=%%fname%%&country=%%country%%&ip=%%ip%%&optin_date=%%date_subscribed%%
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
POST
Successful Response 
queued:1

* Please refer to your GetResponse account for these variables: <your_api_key> <your_campaign>
ALL FIELDS IN API EXAMPLE ARE REQUIRED BY GETRESPONSE

 

Getresponse Example (API v3).

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint 
http://api.listflex.com/wrappers/getresponse.php
Post Variables *
 
apikey=<api_key>&campaign_id=<campaign_id>&fname=%%fname%%&lname=%%lname%%&email=%%email%%&ip=%%ip%%&day_of_cycle=0
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
POST
Successful Response 
Lead Accepted

* Please refer to your GetResponse account for variable: <api_key>. In order to obtain your <campaign_id> value for the API, copy and paste into your browser’s address bar the following link: http://api.listflex.com/wrappers/getresponse.php?apikey=<api_key>&action=getcampaigns

Be sure to swap <api_key> In the URL above with the value for your api key you get from your GetResponse account. The page will list all your GetResponse campaings. Copy the campaing id value of the campaign you want your leads to be posted into and paste it into the Post Variables field instead of <campaign_id> placeholder.

 

Adopia Example

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint 
http://www.adopia.com/services/addListContact
Post Variables *
 
api_key=<api_key>&list_id=<list_id>&response_type=xml&contact[contact_email]=%%email%%&contact[contact_name]=%%fname%%&is_double_opt_in=0
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
GET
Successful Response 
success

* Please refer to your Adopia account for these variable: <api_key> <list_id>

 

Maropost Example

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint *
 
http://api.maropost.com/accounts/<account_id>/lists/<list_id>/contacts.json
Post Variables *
 
{
 "auth_token": "<auth_token>",
 "email": "%%email%%",
 "first_name": "%%fname%%",
 "last_name": "%%lname%%",
 "subscribed_at": "%%date_subscribed%%",
 "contact.ip": "%%ip%%"
}
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
POST
Successful Response 
Subscribed
Headers (advanced options)
 
Content-Type:application/json

* Please refer to your Maropost account for this variable: <account_id> <list_id> <auth_token>

 

Constant Contact Example

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint *
 
http://<api.yoururl.com>/constantcontact/addcontact.php
Post Variables *
 
api_key=<api_key>&token=<token>&list_id=<list_id>&fname=%%fname%%&lname=%%lname%%&email=%%email%%&ip=%%ip%%&date_subscribed=%%date_subscribed%%
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
GET
Successful Response 
success

* Please refer to your Constant Contact account for these variables: <api.yoururl.com> <api_key> <token> <list_id>

 

Reachmail Example

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint
 
http://api.listflex.com/reachmailwrapper.php
Post Variables *
 
acc_id=<AccountID>&username=<USERNAME>&password=<PASSWORD>&listid=<LISTID>&accountid=<AccountID>&email=%%email%%&fname=%%fname%%&lname=%%lname%%&phone=%%phone%%&address=%%address%%&city=%%city%%&state=%%state%%&zip=%%zip%%&optin_date=%%date_subscribed%%&ip=%%ip%%
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
POST
Successful Response 
success

* Please refer to your Reachmail account for these variables: <AccountID> <USERNAME> <PASSWORD> <LISTID>

 

Sendlane Example

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint *
 
https://<subdomain>.sendlane.com/api/v1/list-subscriber-add
Post Variables *
 
api=<api_key>&hash=<hash>&list_id=<list_id>&email=%%email%%&first_name=%%fname%%&last_name=%%lname%%
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
POST
Successful Response 
success

* Please refer to your Sendlane account for these variables: <subdomain> <api_key> <hash> <list_id>

API Documentation: https://help.sendlane.com/hc/en-us/articles/360025840791-API-Docs

 

Interspire Example

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint *
 
<your_interspire_url>
Post Variables *
 
<xmlrequest>
 <username><username></username>
 <usertoken><usertoken></usertoken>
 <requesttype>subscribers</requesttype>
 <requestmethod>AddSubscriberToList</requestmethod>
 <details>
 <emailaddress>%%email%%</emailaddress>
 <mailinglist>4</mailinglist>
 <format>html</format>
 <confirmed>yes</confirmed>
 <customfields>

<item>
 <fieldid>2</fieldid>
 <value>%%fname%%</value>
 </item>
<item>
 <fieldid>4</fieldid>
 <value>%%phone%%</value>
</item>

</customfields>
 </details>
</xmlrequest>
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
POST
Successful Response 
success

* <your_interspire_url>, <username> and <usertoken> can be obtained from your Interspire setup.

 

Email Leads Individually

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint
 
http://lftools1.listflex.com/api/emaillead2client.php
Post Variables *
 
to=<to_emails>&from_email=<from_email>&from_name=Listflex&subject=You have a new Lead&leadinfo_FirstName=%%fname%%&leadinfo_LastName=%%lname%%&leadinfo_Email=%%email%%&leadinfo_Phone=%%phone%%&leadinfo_Address=%%address%%&leadinfo_City=%%city%%&leadinfo_State=%%state%%&leadinfo_Zip=%%zip%%
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
POST
Successful Response 
success

* <to_emails> are the email addresses (separated by comma) that you want to send the lead information to. <from_email> is the email address you want the lead info to appear to have come from.

 

Active Campaign Example

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint *
 
https://<active_campaign_domain>.api-us1.com/admin/api.php
Post Variables *
 
api_action=contact_add&api_key=<api_key>&
email=%%email%%&p[<list_ld>]=<list_id>&status[<list_id>]=<list_id>&first_name=%%fname%%
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
POST
Successful Response 
result_code>1<

* Please refer to your Active Campaign account for these variables: <active_campaign_domain> <api_key> <list_id>. You may also have to whitelist the Listflex IP in your system (ask your sales rep for this). See this screenshot for directions to whitelist.

API Documentation: https://www.activecampaign.com/api/example.php?call=contact_add

 

Mailwizz Example

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint *
 
http://<your_domain>/<path>/index.php/lists/<list_id>/subscribe
Post Variables *
 
EMAIL=%%email%%&FNAME=%%fname%%&LNAME=%%lname%%&CURRENT_DOMAIN_URL=%%offer_url%%&DATE=%%date_subscribed%%&SUBSCRIBER_IP=%%ip%%&COMPANY_CITY=%%city%%&COMPANY_ZONE=%%state%%&COMPANY_ZIP=%%zip%%
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
POST
Successful Response 
Congratulations

* <your_domain> is where you have installed the MailWizz software. <path> is the folder your mailwizz lives in. E.g. email or mailer. <list_id> is the list id you are posting leads into.

 

Integrating with Emercury

Emercury has an excellent tutorial on how to intergrate with Listflex here.

 

Market Hero Example

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint
 
http://api.markethero.io/v1/api/tag-lead
Post Variables *
 
{"apiKey":"<api_key>", "firstName":"%%fname%%", "lastName":"%%lname%%", "email":"%%email%%", "tags":["<tags>"]}
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
POST
Successful Response 
ok

* Please refer to your Market Hero account for these variables: <api_key> <tags>.

API Documentation: https://markethero2.docs.apiary.io/#reference/0/leads/tag-lead

 

Drip Example

 

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint
 
https://api.getdrip.com/v2/<account_id>/campaigns/<campaign_id>/subscribers
Post Variables *
 
{"subscribers":[{"email":"%%email%%","custom_fields":{"name":"%%fname%% %%lname%%"}}]}
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
POST
Successful Response 
subscribers.account
Headers (advanced options)
 
Content-Type:application/json,authorization: Basic <AUTH_TOKEN>

* Please refer to your Drip account for these variables: <account_id> <campaign_id>. Contact your support rep for <AUTH_TOKEN>

API Documentation: https://developer.drip.com/#create-or-update-a-subscriber

 

ConvertKit Example

 

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint *
 
https://api.convertkit.com/v3/forms/<form_id>/subscribe
Post Variables *
 
{"api_key": "<api_key>", "email": "%%email%%", "first_name":"%%fname%%"}
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
POST
Successful Response 
created_at
Headers (advanced options)
 
Content-Type:application/json

* Please refer to your CK account for these variables: <form_id> and <api_key>.

API Documentation: https://developers.convertkit.com/#add-subscriber-to-a-form

 

Ontraport Example

 

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint *
 
https://api.ontraport.com/1/Contacts
Post Variables *
 
firstname=%%fname%%&lastname=%%lname%%&email=%%email%%
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
POST
Successful Response 
firstname
Headers (advanced options)
 
Content-Type:application/x-www-form-urlencoded,Api-Key:<apikey>,Api-Appid:<appid>

* Please refer to your Ontraport account for these variables: <apikey> and <appid>.

API Documentation: https://api.ontraport.com/doc/#create-a-contact

 

Imnica Mail Example

 

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint *
 
http://www.imnicamail.com/v4/api.php
Post Variables *
 
Command=Subscriber.Subscribe&ResponseFormat=JSON&ListID=<list_id>&EmailAddress=%%email%%&CustomField1=%%fname%%&IPAddress=%%ip%%&OptInDate=%%date_subscribed%%&SubscriptionDate%%date_subscribed%%
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
GET
Successful Response 
true

* Please refer to your Imnica Mail account for these variable: <list_id>

API Documentation

 

SendShark Example

 

API Description 
Give your api a good name
API Type 
Regular API
API Endpoint *
 
http://gogvo.com/api/eresponder/add_subscriber
Post Variables *
 
api_key=<api_key>&CampaignId=<campaign_id>&Email=%%email%%&FullName=%%fname%%
Timeout After 
30 Seconds
Date Format 
Y-m-d H:i:s
URL Encode 
NO
Request Type 
POST
Successful Response 
success

* Please refer to your SendShark account for these variable: <api_key> and <campaign_id>

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