International Address Validation Service

Capture the right address every time. 245+ Countries Covered.
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output Address result

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

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Why is Address Verification and Validation Important?

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 mail. And once all of your mail pieces are delivered, they analyze the results based on the response and conversion rates.

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 a CASS USPS-certified address verification 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 verification or validation API.

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What is an Address Verification API?

An address verification service API helps you verify, validate, standardize, parse, geocode and provide a lot of other metadata related to an address adhering to local postal standards.

An Address Validation API or Verification API is an application programming interface (API) that verifies postal information automatically. US address validation APIs normalize addresses to match the standards of the USPS.

PostGrid’s Address Validation API plays an important role in ensuring the addresses entered are cleansed, accurate and standardized according to local postal standards for higher accuracy and clean address data for your records.

In many instances, a user is bound to have errors while entering an address on your website or uploading a list with multiple addresses such as missing suite number, wrong postal address, or other types which can cause a lot of confusion, and wasted hours, and resources. An address verification software can eliminate this hassle and have clean addresses that save time and money.

Our address verification software allows you to verify, validate or standardize addresses in real-time at the point of entry or allows you to verify in bulk allowing you to verify up to 200,000 addresses at once.

Our Address Validate API integrates with your enterprise system or CRM (primarily your website) to fetch the data and match it with your provided country’s postal address verification web service. Using this, you can ensure you have clean data right at the point of entry, reducing the bounce rate of your mail.

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:

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.

High-Quality Data

The address API, like PostGrid, offers 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 address validation web service 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.

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.

How Does Address Verification API Work?

After studying the benefits of address 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 validation API easily and effectively to drop the time, money, and resources you put into a direct mail campaign and get better returns.

Address verification API works by integrating with your system to check and correct all the address data. It can also instantly verify any address that you have entered and provide you with a whole lot of other metadata such as Latitude/Longitude, Geo-coordinates, RDI, ZIP+4, and many more.

Our API is both CASS (USPS) and SERP (Canada Post) certified that ensures all addresses are cleansed, verified, and standardized to local postal standards.

Our Address Validation API can be integrated in the following way 

  • Create an account with PostGrid – Enter the required details and get your account ready in just a few minutes. The set-up is very self-explanatory and quick.
  • Login – Login into your account with your unique user ID and password. A go-to dashboard will be made accessible to you, which will contain everything that you need to use the API.
  • Use the API keys – Your test and live API keys will be available for you through the settings menu. You will have to copy the keys from here. It is recommended that you use these keys only on trusted servers to ensure maximum security.
  • Paste the keys – The next step will be to paste the URL of our validation API to your website’s address form, where you want the addresses to be verified.
  • Start API calls – Once you paste the URL, you will start receiving successful API calls on request. You can even customize it according to you. If you get stuck at any stage or the API is not responding in the way you need, feel free to contact us, and we will help you out instantly.
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Here are the steps of how PostGrid Address Validation API work:

  • To get started with PostGrid’s Address Validation Service 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 records 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 and are 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 address correction 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.
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send certified mail letters

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 whether 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 street 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 Address Data Verification

PostGrid global address API solves the problem that every postal address verification web service provider faces, the difference in language, script, and alignment of information. We have a postal database of nearly 245+ different countries. You can use our international address verification to verify addresses globally.

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


PostGrid’s Address Validation API also returns reverse geocoding data like latitude and longitude coordinates with its geocoding API. 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

Address Autocomplete is, of course, the major feature of the 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 using autocomplete API.

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.

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.

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.

Why Should You Go for PostGrid

CASS & SERP Certified

Addresses are verified to CASS (USPS) and SERP (Canada Post) standards ensuring addresses are verified to highest standards and ensuring higher delivery rate and eliminate wasted hours or spends


Get detailed insights and status of the API including usage, limit and verification status.

Easy Integration

Seamless integration capabilities, detailed API docs and dedicated dev support available to get you started quickly.

Address Validation

Addresses are verified and validated to local postal standards ensuring higher accuracy in deliverability and eliminating returned mail. 


Save your customers’ time with PostGrid’s address autocomplete feature and ensure a seamless user experience and reduced chances of entering wrong addresses with auto suggestion.

Address Parsing

Get each address into its different component, viz., address line 1, address line 2, street, city, state, and zip code with zip code api.

Data Cleansing

Cleanse, verify and validate addresses efficiently, our Address API is CASS (USPS) and SERP (Canada Post) certified.


The time-saving feature can help you get all the captured addresses in the standard US postal address format.

Bulk verification

Get thousands of addresses verified in seconds with PostGrid, and save tons of hours of tedious work.

Competitive Prices

Industry best pricing without compromising on quality

24 Hour Support

Our support team is available 24 hours a day. If you ever get stuck anywhere in the process get in touch with us.

Benefits of Using PostGrid’s Address Verification API

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

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Validate at the entry point: PostGrid assigns the DPV (Delivery Point Verification) codes to all the addresses as per the USPS API 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 Link, 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 one.

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 to 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.

No more lost direct mail pieces:

If you start using PostGrid’s address standardization API, then all the addresses present in your database will be accurate without any data duplication or information gaps. Depending on the number of direct mail you send out and how often, you can save tremendous amount of money and time.

And since no mail is returning or getting lost on its way, the chances of lead conversion also rises with twice the speed as before, and subtracting the investment from the outcome; you can start seeing an ultimate boost in your revenue generation.

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Best data quality:

By utilizing PostGrid Address Autocomplete API at the point of entry, you can ensure that the right address will enter your system. It not only saves you from sending direct mail to wrong or incomplete addresses but also from spam trying to enter your system.

Besides that, with regular cleaning, verifying, and updating your old data list with PostGrid, you can get a quality database within a few days.

Improved Communication:

The foundation of a successful business is effective communication with its customers. When your mail reaches the correct address, your chances of missed opportunities decrease exponentially as your relevant offers get in front of the right people.

With PostGrid address correction API, you can ensure high-quality output. Most of our clients admit that they were spending more on their direct mail marketing campaigns before they started using PostGrid—it helps decrease the overall cost and increase revenue generation.

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Decreased mailing cost:

With better address quality, you automatically reduce wasted spends associated with returned mail or loss of mail due to incorrect addresses. Our address verification software will ensure your addresses are cleansed, verified, and standardized to local postal standards ensuring a smooth print and mail process.

Quick benefits of using PostGrid

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Increment in overall process speed:

with a fast and on-the-spot Address normalization API, you can completely eliminate the manual work and speed up the process. As it takes around 3-5 business days to verify the collected addresses manually.

Faster turnaround time:

with less manual work and verifying the addresses instantly on submission, you can also send the requested document (or a particular offer) in comparatively less time.

Scalable services:

You can verify as many numbers of addresses as you want. From thousands to millions of addresses, our address validation software helps our clients verify them all.

Annoyed With Returned Shipments and Incorrect Data?

Use PostGrid’s Address API to Standardize, Validate, and Verify Millions of Addresses in One Go


Which Businesses Should Use an Address Verification 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 spam 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 USPS address validation API:

Address-Verification service
  • E-commerce platforms: All e-commerce sites need to deliver products to a number of addresses on a daily basis. And sending the mailers regularly to wrong shipping addresses can cause them way too much money, and eventually decrease their returns. Hence, an address verification API services is essential for these companies to not only maintain the profit but also to gain high returns.
  • Branding Personal Stores: 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 postal address validation web 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 Lookup API & tools like PostGrid help 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 correction API like PostGrid for saving money. To connect the people offering and needing a loan, the companies require to do 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 software for a wide variety of businesses. It helps avoid misspending.
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How to Use our Address Verification API:

PostGrid allows brands and companies to verify thousands of addresses in seconds. To clean your database and get rid of the information gaps, you’ll need to follow some steps:

  • Create an account on PostGrid
  • Login and open the PostGrid dashboard
  • Secure your account by adding trusted domains only
  • Click on setting → Addresses → Copy your API keys
  • Paste the API URL in your browser

PostGrid’s 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 correction API.

Once you’ve followed the steps described above, you’ll get a successful API call. If you face any difficulty in the process or cannot get a successful call, you can contact us or check our FAQs page.

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