Address Verification

Address Validation API

By 6 April 2023April 10th, 2023No Comments

International Address Validation Service

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output Address result

3075 14th Ave. #212, Markham,
ON, L3R 5M1, Canada

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Address Validation API

Verify, validate, standardize, auto-complete and cleanse your address list with PostGrid’s CASS & SERP certified address validation API in realtime. Use our Standard API to Verify US & Canada Addresses.

address data management system

Use our Global/International Address Validation API to Verify, validate, standardize, auto-complete and cleanse addresses realtime across 245+ countries.

See Our US & CA Address Validation API & Tool in Action

What is Address Validation API

Companies invest the highest amount of money in launching direct mail marketing campaigns. Apart from that, most businesses, including financial institutes, real estate businesses, etc., send direct mail pieces regularly.

Businesses put a large amount of money, time, and resources into creating, designing, printing, and shipping direct mails. And once all of your mail pieces are delivered, they analyze the results based on the response and conversion rates.

direct mail letter service
Being one of those business owners, you should note that a significant percentage of the mailpieces you send aren’t really reaching the intended recipient.

The direct mail results you’ve analyzed until now can be inaccurate if you don’t regularly clean your database and eliminate the wrong addresses. Based on the outcomes, all money and resources used in creating, printing, and mailing the direct mails that never reached their recipient have gone in vain.

Hence, to avoid such things from happening to you, consider getting an address validation API.

This type of API usually helps you clean and validate your mailing list by matching the details with the official USPS database.

With the right address details of your recipient in your system, you can decrease the misspending and lost opportunities and get more accurate analytical reports.

Let’s find out how your business can benefit from an address validation API.

Why Do You Need an Address Validation API

An address verification API can help your companies in a lot of ways and double your returns. Some of them are mentioned below:

High-Quality Data

The address validation API, like PostGrid, offer you at least three features: address parsing, standardization, and validation. By parsing and standardizing the data present in your mailing list, API makes sure that the data is available in the right format. By validation, it ensures that the addresses are correct as per USPS guidelines.

Plus, the USPS database keeps on updating with the new location details. Hence, PostGrid keeps on updating your mailing list accordingly. Besides that, as you grow, new addresses keep on filling your mailing list. With entry-point verification, PostGrid makes sure that only correct data enters your system.

This way, the data in your mailing list is always of high-quality.

Saves Time

Once you merge PostGrid with your CRM or other systems, the API works automatically depending on the instructions you have set. From letting only correct and accurate data enter your system to keep on cleaning and updating the customer detail, PostGrid does it all automatically.

This way, you get to save a lot of time that you might have otherwise spent collecting and matching the data with the official database manually.

Enhance Your Conversion Rate

The faster your customer reaches the call to action, the better your conversion rate will be. The address validation API provides the address suggestions as your customers start typing their addresses.

It lets your customers and prospects fill their details at a better speed and take them to the final CTA more quickly.

Plus, it also ensures that they only enter the correct address. For example, as an individual starts typing their address details, PostGrid will recommend them a number of addresses depending on the area and zipcode they’ve entered. It’ll force them to choose one of the suggested addresses.

If they fail to do so and API doesn’t recognize the address they have typed, they’ll have to change it and choose the correct address. This way, you can guarantee the order’s shipping and delivery to the right address on time.


Over the years, things have changed vastly, and technology has advanced way too much. Similarly, no company in the business of sending regular direct mails would be willing to do it the traditional way.

The old ways are not only time-consuming but cost a lot too. With an automated API in place, you can eliminate all such methods and the money you’d otherwise spend operating in those ways.

The address validation API stores the instructions given to it and manage the tasks quickly and accurately. This way, you save money from the beginning of the tasks. However, for some reason, if your customer returns the parcel and you need to send a different package to the same address, you can do it with a few clicks without entering every detail again.

Improve User-Experience

When your customers or potential customers visit your store, they judge it by the interior of walls, furniture, staff, and of course, the quality of your products.

Similarly, when someone visits your website, they check out how it represents your brand, how easy it is to find things there, and the user-friendly features you have displayed.

A good company will always try to make their user’s journey a cakewalk on their website. Hence, you must use such features that enhance the user experience and enable them to place an order quickly.

The address validation API can help you do it just by its integration with your CRM.

International Supplies

When you’re in a business where you have to send parcels, packages, and direct mail pieces overseas, nothing changes for shipping it to the correct address except for fear of damage.

When you send something locally or even within the same nation, you have a thorough knowledge of the addresses’ format and other details.

However, it’s not the same for the international addresses. Every country has its own laws, making it difficult for you to follow up.

PostGrid has databases of over 150 countries, allowing you to ship to the right address confidently without fearing the loss you might have to face on the loss of your direct mail pieces.

Plus, just like you can automate the shipping of your direct mail pieces in the US, you can also automate them overseas.

Features of PostGrid Address Validation API

Address Validation

Our API helps you to verify whether an address is valid or not. We rely on the USPS database to check the existence of addresses. 

Address Standardization 

PostGrid Address Verification API standardizes address format according to USPS guidelines. It helps businesses to avoid discrepancies in the address formats. 

Geocoding Capabilities 

Our API converts addresses into geographic coordinates (latitude and longitude) with geocoding capabilities. It can help you pinpoint the exact location. 

Address Autocomplete 

The innovative Address Verification API provides autocomplete address suggestions as the user types in a form. It reduces errors and ensures the accuracy of addresses. 

Data Enhancement 

The API helps enhance the addresses by providing extra information such as ZIP codes, state, county, etc. You can create more detailed and accurate customer mailing addresses. 

Bulk Address Verification 

PostGrid’s Address Verification API allows users to verify many addresses at once. You can upload a CSV file to start bulk address verification and get results for each mailing address. 

Reverse Geocoding 

We help our users to convert geographic coordinates into readable addresses or locations. It provides accurate information on street addresses, ZIP codes, countries, and other details. 

Real-Time Feedback

The API provides real-time feedback on the progress of the address verification process. It informs which addresses were verified and which ones have failed.

How Does PostGrid Address Validation API work

After studying the benefits of address validation API, you can determine how much loss the lack of a proper verification API can do to your business.

By sending your mailpieces to the wrong addresses, you can hurt your chances of increasing sales, deepening bonds with your customers, and nurturing or delighting your current clients. Apart from that, you also lose the money, resources, and time you put into it.

Manually standardizing and validating the addresses can be time-consuming and tiresome. Being tedious tasks, they can let you slip on a few errors, like typing, spelling, or formatting mistakes. That may affect your brand’s reputation considerably.

Hence, you must clean the data of your mailing list regularly and keep a check on the wrong information from entering your system. You can solve all of such problems with a single PostGrid API.

Moving forward, we’ll discuss how you can use one such API easily and effectively to drop the time, money, and resources you put into a direct mail campaign and get better returns.

Here are the steps of how PostGrid Address Validation API work:

  • To get started with PostGrid’s Address Validation API, you’d need to integrate it with your CRM, website, or other systems.
  • Once integrated, it’ll fetch all of the customers’ details present in your database.
  • After collecting the data, it’ll parse each of the customer record present in your mailing list. By parsing, it means breaking down the different components of an address to make it clearer.
  • Next to data parsing, it’ll standardize all of the records. It means changing the formatting according to the guidelines of USPS.
  • Once all of the separate customer addresses are in the right format, being CASS certified, the API will validate each of the entries with USPS’s official database.
  • Besides, it lets only accurate and valid addresses enter your system once integrated. Thus, keeping the quality of your mailing list high and keeping the spam away from your system.
  • For entry-point data cleaning, the API suggests valid addresses to the prospects as they start typing in the empty field. Gradually, as they continue to type, the recommendations get better and more exact. Now at the end, they can select the right suggestion and save it.
  • If the prospect fails to select one of the suggested addresses, the API will not let them move to the next step, and they will need to locate the error they’re making and fix it. This step ensures that only correct data enters your system.

You can also do it manually by following these steps:

  • Collect all the entries of customers from your system’s data that you want to validate.
  • Go through each record one by one, keeping the USPS guidelines in mind.
  • And parse, standardize, and validate your data.

It might seem like a simple process, but it can be challenging to manage and verify tens of thousands of customer addresses without making any mistakes. Plus, it’ll eat up tons of your hours, resources, and money, and yet, it’s not clear that your database will be error-free at the end or not.

An automated API can improve your data cleaning process ten folds and save you a tremendous amount of time. Plus, all of your direct mail pieces reach the right recipient, reducing your misspending cost.

Why PostGrid Address Validation API is the Best Choice For You

You might be thinking, tons of address validation API are available in the market. Why on earth do I choose PostGrid?

Well, your question is valid and fair, which is why we’ll discuss a number of features, PostGrid offers that can change your life.

Let’s find out what they are.

Global Data Verification

PostGrid solves the problem that every address verification service provider faces, the difference of language, script, and alignment of information. We have a postal database of nearly 200 different countries.

With PostGrid, you can translate each of the addresses that your customers provide, get them parsed, standardized, and validated within minimal time. This way, you can ensure the right mail delivery, on time even cross borders.


By definition, it means tracking your user’s location by their public ID on their approval. It helps collect the accurate address details and ship the order to the right area without any confusion. If you integrate PostGrid with your CRM, you can quickly get your prospects’ complete information without them even typing it in. This feature also helps them reach the CTA more speedily and place their order.

Address Autocomplete, Parsing, and Standardizing

This is, of course, the major feature of PostGrid address validation API. It fetches the entire data from your system within minimal time to parse, standardize, and validate it within milliseconds per record.

Scalable Processes

One of the biggest mistakes that companies make is to validate their data once and think it’s good to go for ages to come. With the growing business, grows your mailing list, and you’d definitely need to parse, standardize, and validate the new addresses by scaling the process.

Plus, the data keeps on changing, which is why you’d also need to keep on updating it in line with the official database of USPS. Hence, PostGrid provides the scaling feature, where you can verify as many addresses as you want and at any time.

Data Improvement

Along with identifying the correct, valid, and incorrect addresses, wouldn’t it be helpful if you could also manage to determine the “not yet build” area details?

PostGrid helps you know each one of them. So you can segment your audiences and ship your direct mail pieces only to the deliverable addresses, where someone is definitely receiving them. In other words, the address exists in real-time.

Excellent Customer Support

With PostGrid, you can leverage customer services 24×7. Although the API is super simple to use — integrate it with your system, get the live API keys, and get started. Yet, if you face any difficulty getting your API keys or any other problem, you can contact us. We’ll provide a solution to your query within one business day.

Data Safety and Security

Privacy is the primary concern at PostGrid, which is why we have a direct partnership with HIPAA, PIPEDA, SOC-1, and SOC-2 compliant vendors. We guarantee the safety and security of your and your customer data. This way, you can make decisions undoubtedly.

System and Zapier Integrations

The major reason behind integration is the smooth user interface so you can manage and operate multiple software and applications with ease. When you integrate PostGrid with your system, you can perform numerous tasks, viz., data fetching, with a single click.

Similarly, we offer zapier integration, which helps you to incorporate over 1600+ apps. This way, you can automate most of the tasks and functions.


One of the excellent features of PostGrid address validation API is that it detects similar customer details present in your system and removes them.

More than often, due to retargeting, most companies contain the record of a single prospect multiple times in their database. It results in sending several copies of your direct mail to a single potential customer.

Hence, you not only annoy the recipient but cost yourself money too, which goes into creating, printing, and shipping the direct mail. Plus, depending on the number of duplicate addresses present in your system, this cost keeps going higher.

That’s why de-duplication of the addresses is as essential as verifying the validity of the addresses. Apart from this, the validation API also helps remove all the information gaps, spelling errors, typing mistakes, and other similar errors from your mailing list.


Besides providing you with excellent features to reduce your investment and misspending and increase your returns, PostGrid offers competitive prices. Depending on your business type and size, you can choose a package that best suits your needs. We offer no hidden fees. You only pay for the options and features you decide to get.

Which Businesses Should Use an Address Validation API

The primary use of address verification API is to ensure that the data entering your system is correct, free from errors, complete, and exists. Besides that, it also checks for the other details and keeps the spams from entering your database, similarly, you can also check the already registered addresses in your system for accuracy. The API will analyze and match all the addresses with the standard data available in your country’s postal services in the case of PostGrid—USPS.

Here’s a list of the businesses that can use address verification API:

E-commerce Sites: All e-commerce sites need to deliver products to a number of addresses on a daily basis. And sending the mailers regularly on wrong shipping addresses can cause them way too much money, and eventually decrease their returns. Hence, an address verification API is essential for these companies to not only maintain the profit but also to gain high returns.

Branding: Most businesses start to sell – the products available in their stores – online and offer shipping options to their customers for convenience. However – in an era of online payment – delayed delivery or sending the packages to the wrong address may ruin the stores’ reputation and cause business loss. That’s why most such companies contact us to get PostGrid for verifying the addresses in their database.

The Third-Party Logistics: Some 3PL companies – that contract with the online brands and other product selling businesses for shipping their products – usually take address verification services like PostGrid. These services help them serve their clients better with minimum returns.

Short-term Rental Homes Service Sites: Most of the time, when a new user lists their property on a site like these, it becomes necessary to confirm the location to prevent the end-user from getting lost or having difficulty in finding the homes. It’s especially essential for users opting to pre-book homes or hotels. Address verification API, like PostGrid, helps businesses gain the trust of their customers by providing them accurate data.

Credit Check Services: Banks or other financial services companies – which are not directly related to shipping mailpieces – can benefit from the address verification services like PostGrid for saving money. To connect the people offering and needing a loan, the companies require a credit check. And despite the accuracy of the data provided, they need to get the job done. That’s why PostGrid offers address validation services for a wide variety of businesses. It helps avoid misspending.

Benefits of Using PostGrid’s Address Validation API

Here are some other benefits of using PostGrid Address Validation API:

Validate at the entry point: PostGrid assigns the DPV (Delivery Point Verification) codes to all the addresses as per the USPS database. This feature checks the validity of the address your prospects are typing in the empty fields and gives them proper suggestions. This way, you keep and let enter only the correct addresses in your mailing list.

The LACS Link: Using the Locatable Address Correction System, PostGrid updates your database with the addresses changed or modified for emergency purposes.

The RDI System: Residential Delivery Indicator is a feature in PostGrid that helps you detect and separate the commercial address from the residential ones.

SuiteLink: This unique feature enables the API to find and fix the apartment, floor, room, or suite number if your prospects provided the wrong or no address such information at all. This feature can save you from dropping the packages at the main gate of the building, exposing you to the chances of losing them. With this facet, you ensure the delivery of your direct mail right at the door of your recipient.

Intelligent Mail Barcodes: If you want to locate and track your shipped direct mail pieces, PostGrid helps you do it with Intelligent Mail Barcodes. This feature also enables you to find out the exact time it’s taking for your mails to reach the recipient after being shipped, which can help the final analysis of your direct mail campaign.

What is an Address Correction API?

Address correction is fixing addresses with typographical errors and improper format. The API makes these addresses with a standardized and validated version of an official address database (For example, USPS). 

A government body creates an official address database to ensure smooth mail delivery. Some countries also have authoritative address databases; they are more complex and comprehensive than official databases. These databases can gather data from various public and private databases. They help fill the information gaps left or omitted by official databases. 

An Address Correction or Validation API automatically fixes errors. It verifies if an address is present in the database of a specific country. The addresses that exist on the database are “valid” addresses. These APIs can verify and confirm addresses in a matter of seconds. PostGrid’s Address Validation tool verifies thousands of customer addresses and datasets in just a few seconds. We have a dedicated authoritative address database. 

What is USPS Address Validation API?

USPS manages the official addresses database in the United States of America. Users can access this address information with their dedicated API. Moreover, USPS also allows third-party developers to develop their APIs with the help of official USPS data. This helps users to fetch essential data more efficiently and robustly than USPS’s API. 

USPS mail that goes through international addresses does not provide a global address validation API. For this reason, PostGrid’s Address Verification API is ideal for international mailing addresses.

What is Google Address Validation API?

Google also launched its Adress Validation API recently on November 2022. This API is still in its infancy and is available only in specific countries. Google might be the right fit, especially if you run an eCommerce business. Yet, the API has several limitations, and you will need to go through their restrictive Terms of Service. These could be the major drawbacks of using Google Address Validation API; 

  • Google will only allow you to save addresses for up to 30 days. 
  • The address validation capabilities still need improvement. Sometimes the API would combine various components into a single, making addresses more complex than they should be. 
  • Batch address validation is relatively slow with Google’s API because it only allows only 100 queries per second. 
  • Google needs to provide a unified solution for address validation and address autocomplete. It means users must use two separate APIs for autocomplete and validation processes. There are unnecessary extra steps and confusion throughout the entire process. 

Considering those limitations with Google’s Address Validation API, It is ideal to go with our API. You can check our reviews as an address validation provider to better decide. 

What is an Address Standardization API?

Address standardization is converting addresses according to USPS standards or any specific country. An API can help modify the addresses to comply with the official postal format of the country where the postal address is present. 

You might use Google’s address validation API for address standardization. The industry does not expect to standardize mapping, geocoding, autocomplete, or APIs.

What is USPS ZIP Code APIs?

These APs can do multiple tasks with ease. They can help verify addresses that have ZIP Codes affixed to them. Use them to insert ZIP+4 code data into an incomplete address. 

ZIP codes are only used in the United States, so a ZIP Code API gives ZIP code data for addresses in the US. However, you might misinterpret ‘ZIP Codes’ as Postal Codes in countries other than the US. 

PostGrid Address Verification API can also provide postal code data for addresses outside the United States of America. 

Which Address Countries/Formats Can We Use with the Address Verification API?

PostGrid Address Verification API works with international addresses. Our API parses addresses before validation. Users can insert a separate address component (home number, street, city, postal code) as an input parameter. 

Can I Save the Results Provided by the PostGrid Address Verification API?

Yes, our users can save the results. However, we recommend keeping the required data source attributions. 

What Information is Necessary to Use Our Address Verification API?

The PostGrid’s Address Verification API requires users to enter street addresses, state or province, city, or zip code. 

What is the Accuracy of Our Address Verification API?

The accuracy of the address verification mainly depends on the address data that needs verification. PostGrid provides highly accurate results for address verification. 

How Long Does It Take to Verify Addresses Through PostGrid Address Verification API?

The time taken for the verification process depends on many factors. Yet, PostGrid’s Address Verification API can give you results within seconds. 

How Secure is Our Address Verification API?

PostGrid Address Verification API complies with HIPAA, PIPEDA, SOC-1, and SOC-2 guidelines to ensure the highest data security. This way, you have the peace of mind that your and your customer’s data is safe with us.


Address validation API can help take your business ahead by improving your direct mail campaigns and reducing the wasted money. If you have a huge mailing list and your business requires you to send regular direct mail pieces, consider investing in an address verification API.

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