GTM AI Index

Index › Products › USPS Address Validation API · October 2026 Edition

1 category · Named, not ranked

USPS Address Validation API

3Judge labels

1First choices

1Negative labels

3 / 14Models named it

1Category

October 2026 Edition. Every number here is derived from the raw labels under vendor table v2026-10-05.2, every buyer segment counted.

Standing

2 labels, too few to rank

A product needs 10 labels in a category before a share or quadrant is stated. USPS Address Validation API was named 2 times in Address verification, where Smarty led with 47%. The labels and the evidence are below, counted exactly.

By buyer segmentRead the same way at every buyer size.

Small business11 of 81

under the label threshold

Mid-market74 of 108

under the label threshold

Enterprisenot named

No model named it for this buyer.

In address verification · each standing computed within its segment · bars are 0 to 100 · the accent bar is the product's own best reading

Standing by category

Every category where a model named USPS Address Validation API for a mid-market B2B company. Share is first choices across the direct, paraphrase, budget and scale prompts; rank is within every product named in that category.

Category	Function	Share	Rank	Negative rate	Labels	Quadrant	Since September 2026
Address verification tools	GTM data and infrastructure	0%	74 of 108	50%	2	under 10 labels · led by Smarty at 47%

Movement

This is the first edition on this tier, so no move can be computed for USPS Address Validation API yet. From the next edition this section shows, per buyer segment and per category, whether its share moved by more than the measured noise floor.

By model

How each model treated USPS Address Validation API across every prompt where it was named for a mid-market B2B company. Fourteen models, six prompts per category.

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Model	Alternative	Negative	Labels
Claude Haiku 4.5	0	0	0
GPT-5.4 mini	0	0	0
Gemini 3.5 Flash	0	0	0
Perplexity Sonar	0	0	0
Grok 4.1 Fast	0	0	0
Mistral Small	1	0	1
DeepSeek V4 Flash	0	0	0
Llama 4 Maverick	0	0	0
Qwen 3.7 Flash	0	0	0
Kimi K2	0	0	0
GLM 4.7 FlashX	0	0	0
MiniMax M2.5	0	0	0
GPT-6 Luna	0	1	1
Muse Glimmer 30B	0	0	0

By framing

Which of the six questions produced the naming. By model says how often; this says asked what. The first-choice count on the right carries the marks of the models that produced it.

FramingLabels by classFirst choices

Direct0 labelsNone

Paraphrase1 labelNone

Comparative0 labelsNone

Budget-constrained1 label1

Scale-constrained0 labelsNone

Negative1 labelNone

First choiceAlternativeMentionNegative3 labels in all, every segment counted; 1 of the 1 first choices count toward share, since the comparative and negative framings do not. The bar is one segment per label class, to scale within the framing.

What the models said for it

Verbatim evidence the judge attached to positive labels.

“For US-only businesses, the USPS API is a reliable and cost-effective option.” Mistral Small · Address verification · paraphrase prompt · alternative

And against it

Verbatim evidence attached to negative labels. A warning on a product with few labels is a warning; on a product with many, it is one voice among them.

“USPS says its Address Validation API is for USPS shipping or mailing services—not for sourcing addresses to build a database.” GPT-6 Luna · Address verification · negative prompt · soft negative

Named alongside

The products named in the same answers as USPS Address Validation API, over the 3 answers that named it. Took the first choice instead counts the answers where the other product was the first choice and USPS Address Validation API was named but was not.

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ProductSame answerTook the first choice insteadHead to head

Google Maps Address Validation API1 of 31Not among the top eight

BeenVerified1 of 30Not among the top eight

Google Address Validation API1 of 30Not among the top eight

Google's Address Validation API1 of 30Not among the top eight

Melissa1 of 30Not among the top eight

Melissa Address Validation API1 of 30Not among the top eight

PostGrid Address Validation API1 of 30Not among the top eight

PostGrid Address Verification1 of 30Not among the top eight

Radar1 of 30Not among the top eight

Spokeo1 of 30Not among the top eight

A head-to-head page exists where both products are among a category's top eight. The other rows are the same fact without a page behind them, so they link to the product instead.

What carried it into the answer

The sites and pages cited by the answers that named USPS Address Validation API. A fact about retrieval, not a lever on the model.

Citations exist only for the models that return a source list, five of the fourteen in this edition, so these counts come from 3 of the 3 answers that named USPS Address Validation API and are not a share of its labels.

Domains cited

developers.google.com2

melissa.com2

postgrid.com2

usps.comYour site2

apollotechnical.com1

atoship.com1

consumer.ftc.gov1

cufinder.io1

dataintelo.com1

fixthephoto.com1

Twelve of the fourteen domain citations in answers naming USPS Address Validation API came from somebody else's page.

Pages cited

usps.com/business/web-tools-apis/address-information-api.htm2

apollotechnical.com/address-verification-apis-for-saas-and-b2b-marketing-teams1

atoship.com/blog/address-verification-apis-usps-google-smartystreets1

consumer.ftc.gov/articles/what-know-about-people-search-sites-sell-your-information1

cufinder.io/blog/api/best-address-validation-apis1

dataintelo.com/report/global-address-verification-software-market1

developers.google.com/maps/architecture/choose-an-address-validation-solution1

developers.google.com/maps/documentation/address-validation/policies1

Pages are listed as the models cited them.

Search and answers

usps.com ranks first on Google for the category's searches. In the answers, USPS Address Validation API takes 0% of first choices and Smarty takes 47%.

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In search

Google, US estimates

Position for “address verification tool”

Position for “best address verification tool”

–

not in the top ten

In answers

This edition

Share of first choices

rank 74 of 108 in address verification

Segment leader

47%

Smarty

First choices: 1 across its categories
Named in: 3 answers
Its own site cited: in 3 of the answers that named it

Search figures are US estimates from DataForSEO, read October 5, 2026; AI search demand is its modeled, directional estimate, not a count of queries to any assistant. The answers are this edition's. Two measurements side by side: neither is read as the cause of the other.

Follow USPS Address Validation API

An email the morning each edition publishes: where this product moved, where it held, and by how much against the noise floor. One address, confirmed by a click; a stop link in every email.

Already following? Everything you follow, with a stop for each.

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Claim this page

Claiming is free and changes nothing in the data. A claimed page shows a verified contact who is told when each edition publishes and when USPS Address Validation API's standing changes by more than the noise floor; the right to propose corrections to the vendor table, meaning names the judge wrote that should or should not read as USPS Address Validation API, applied by version and listed in the change log; and a one-line description supplied by the vendor and marked as such.

What a new claim receivesHide what a new claim receives

A new claim receives the current edition's vendor brief for USPS Address Validation API by email, built from the raw record of the edition. It shows:

where USPS Address Validation API is named, by buyer and by framing, and which cells hold its first choices;
the claims the models make when they name it, ranked, with the strongest and the weakest quoted;
its vocabulary against the segment leader's, and the pages the models cited;
who was chosen in the answers that did not name USPS Address Validation API, and every reason the record gives;
a battlecard for each top rival: the head-to-head split, why they win, and the reservation quoted against them;
one page of published figures cleared to show a buyer.