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GTM AI Index
Index › GTM data and infrastructure › October 2026 Edition

Address verification tools

Asked as “address verification tool”, and as “address validation API”, on behalf of a mid-market B2B company. 53 first choices recorded across the direct, paraphrase, budget and scale prompts, fourteen models each. Added to the October 2026 Edition on October 4, 2026; its answers are read by the distilled judge (ai-indexes-judge-qwen3-14b-run3), not the claude-opus-5 judge of the earlier categories: how the two compare.
Standing · first-choice share
47%
Clear leader
47Smarty08Melissa08PostGrid Address Verification38others

47% of first choices, clear leader.

By buyer segment

The same question asked on behalf of a different buyer. Each standing is computed within its segment; they sit side by side and are never added together.

The standing

Share is the count of first choices across the direct, paraphrase, budget and scale prompts, over all fourteen models, for a mid-market B2B company. Ordered by share.
ProductFirst-choice shareNegative rateLabelsQuadrantSince September 2026
01Smarty47%0%61endorsed leadernewNew since September 2026: not ranked then, 47% now.
02PostGrid Address Verification8%3%39accepted challengernewNew since September 2026: not ranked then, 8% now.
03Melissa8%5%39accepted challengernewNew since September 2026: not ranked then, 8% now.
04Loqate4%0%33accepted challengernewNew since September 2026: not ranked then, 4% now.
05Google Address Validation API Lab in the set4%10%10accepted challengernewNew since September 2026: not ranked then, 4% now.
Show the two products at 0%, ordered by negative rate
07Experian Data Quality0%10%10accepted challengernewNew since September 2026: not ranked then, 0% now.
06Lob0%6%18accepted challengernewNew since September 2026: not ranked then, 0% now.

The floor is 11 points of share, measured: how far the models move a leader on their own when the same questions are asked twice with nothing changed. A larger change is movement; a smaller one is noise, and both are shown. Movement is read over the twelve models both editions asked; GPT-6 Luna, Muse Glimmer 30B joined this edition and are in the standing but not yet in the comparison. How the floor is measured

Bars are the share of first choices, 0 to 100Every product with at least 10 labels here. Every product name links to its product page.

Google Address Validation API is made by Google, whose model Gemini 3.5 Flash is in the set. On the four share prompts that model made it the first choice zero times of 4; the other thirteen models two times of 52. Lab treatment is defined on the method page; the row is marked, not excluded.

All ten head-to-head pages: the top five products, each against each

Recommended versus criticized

Every product with at least 10 labels here, on both axes. The 30% line names a quadrant, not the verdict above: that one needs more than 40%.

Criticized challengerCriticized default
Negative label rate →
01
02
03
04
G05
06
07
Accepted challengerEndorsed leader
0%First-choice share → · lines at 30% share and 25% negative60%
Key
01Smarty47%
02PostGrid Address Verification8%
03Melissa8%
04Loqate4%
05Google Address Validation API4%
06Lob0%
07Experian Data Quality0%

What they warned about

Eight of fourteen models held their first choice under the paraphrase. GPT-5.4 mini, Gemini 3.5 Flash, Mistral Small, Llama 4 Maverick, MiniMax M2.5 and Muse Glimmer 30B changed. A high negative share on a product with few labels is a warning. A low share on a product with many labels is salience, not sentiment.
Google Maps Address Validation API
60%
3 of 5 labels negative · 3 of 14 models · 2 hard negative
“here are address verification tools you should avoid or be cautious about: ## Google Maps Address Validation API” Claude Haiku 4.5, negative prompt
USPS Web Tools
100%
3 of 3 labels negative · 3 of 14 models · 1 hard negative
“The USPS officially retired the legacy Web Tools platform on January 25, 2026... completely non-functional.” Gemini 3.5 Flash, negative prompt
getaddress.io
100%
2 of 2 labels negative · 2 of 14 models · 2 hard negative
“Avoid: **getAddress.io** (high-risk / legally compromised)” DeepSeek V4 Flash, negative prompt
BeenVerified
100%
2 of 2 labels negative · 2 of 14 models · 1 hard negative
“as a substitute for postal validation. They compile personal information from brokers and public records; a match doesn’t establish that an address is current or deliverable.” GPT-6 Luna, negative prompt

What they cite

Citations exist only for the models that return a source list: fourteen of the fourteen in this edition, and all six flagship models on the expanded tier.

Sites the answers cite

75 of 84 answers in this category came back with a source list, from 14 of 14 models: citations where the model returns them, or the search results it consulted. 1017 links across 182 sites, every framing counted. Ranked by the number of answers carrying the site or page. None of the 252 answers across every segment cited this index's own page for the category.

vendor site · Smarty50 answers · 122 citations · 13 models
vendor site · Melissa43 answers · 61 citations · 13 models
vendor site · Guideflow42 answers · 42 citations · 11 models
vendor site · PostGrid37 answers · 58 citations · 12 models
36 answers · 55 citations · 11 models
vendor site · OpenCart28 answers · 28 citations · 12 models
vendor site · Radar24 answers · 25 citations · 11 models
24 answers · 24 citations · 11 models
vendor site · Shufti Pro21 answers · 23 citations · 9 models
17 answers · 25 citations · 8 models
16 answers · 16 citations · 11 models
vendor site · GeoPostcodes15 answers · 16 citations · 10 models

Pages the answers cite

The ten pages named in the most answers, by full address. A page here is one the models returned with a recommendation, not one the index endorses.

Search against answers

Each company's standing in the answers beside its site's footprint in Google search, one row a site: the products the models named on it with their shares, and the share they add up to; monthly searches on Google, and DataForSEO's estimate of AI search demand (modeled from search signals, directional, not a count of queries to any assistant), for the most-searched of the company's and its products' names (the name is in each row's hover text); estimated monthly organic visits to the site; and its best position in Google's top ten for “address verification tool”, “best address verification tool”. US estimates from DataForSEO and Google's Ads Transparency Center. A small company's site, or a mid-sized company's site for its flagship, is marked company; a product on a large parent's site (Google, Microsoft) has no site figures. A column with no figures for this category is left out, and an empty cell means none were seen, not none exist. Two measurements side by side: neither is read as the cause of the other.
Company and productsShareOwn site citedName searches, GoogleAI search demand, est.Organic visitsPaid search a month, est.Google ads, last 30 daysBest Google position
Smarty smarty.com47%18212,1006,510503,2691202
Melissa melissa.com
Melissa 8%, Melissa Global Address Verification 4%, Melissa Address Verification 2%
13%105135,00084,957197,334295
PostGrid Address Verification postgrid.com8%115901196,042$765120
Loqate loqate.com4%9072017127,87852
Google parent site
Google Address Validation API 4%, Google Address Validation 0%
4%3272024
Lob Address Verification2%
Experian experian.com
Experian Address Validation 2%, Experian Data Quality 0%
2%392,240,00011,04811,578,864 company$1,386969
AddressZen addresszen.com2%4
Google Maps Platform2%
Geocodio2%

Google's top ten for the two searches hold 17 sites; 1 of them are among the sites the models cited here (smarty.com). The first result for “address verification tool” is tools.usps.com.

How they answered

Six framings of the same buying question, each sent to every model in a fresh session with search on. One row per model, so a row shows whether it held its answer under rewording, what it named when cost was the constraint, and what it argued against. Computed from the raw judge labels.
ShowHide
ModelDirect“What is the best address verification tool for a mid-market B2B company?”Paraphrase“Which address validation API would you recommend to a mid-sized B2B company?”Comparative“What are the top address verification tools and how do they differ?”Budget-constrained“What is the best address verification tool for a company with a limited budget?”Scale-constrained“We are a 500 person company evaluating an address verification tool. What should we look at?”Negative“Which address verification tools should I avoid or be cautious about?”
Claude Haiku 4.5PostGrid Address Verification
Three alternativesInformatica Data as a Service, Melissa Address Verification, Smarty
PostGrid Address VerificationHeld
Two alternativesLoqate, Smarty
Smarty
Five alternativesExperian Data Quality, Incognia, Loqate, Melissa, PostGrid Address Verification
PostGrid Address Verification
Three alternativesLoqate, Melissa Global Address Verification, Smarty
no first choiceagainst: Google Maps Address Validation API, Melissa Data
GPT-5.4 miniMelissa Global Address Verification
Three alternativesExperian Address Verification, PostGrid Address Verification, Smarty
SmartyChanged
Two alternativesGoogle Address Validation API, Melissa
Smarty
Two alternativesLoqate, Melissa
against: USPS-based tools / USPS validation
Smarty
One alternativeMelissa
against: USPS Web Tools
no first choicenothing named
Gemini 3.5 FlashLoqate
Four alternativesLob, Melissa, PostGrid Address Verification, Smarty
SmartyChanged
Three alternativesLoqate, Melissa, PostGrid Address Verification
against: Google Maps Address Validation API
Smarty
Five alternativesBatchData, GeoPostcodes, Google Address Validation API, Lob, Melissa
against: USPS Web Tools API
Geocodio, USPS Address API
Three alternativesEasyPost, Geoapify, Google Maps Address Validation API
no first choiceagainst: FedEx, Google Places Autocomplete API, UPS, USPS Web Tools
Perplexity SonarSmarty
Three alternativesLoqate, Melissa, PostGrid Address Verification
SmartyHeld
Two alternativesGoogle Address Validation API, PostGrid Address Verification
Smarty
Three alternativesLoqate Verify, Melissa, PostGrid Address Verification
against: Placekey, Postalytics
Melissa, Smarty
One alternativeExperian Data Quality
no first choiceagainst: AVS for card payments, Google Address Verification, Google Maps Address Validation
Grok 4.1 FastSmarty
Two alternativesMelissa, PostGrid Address Verification
against: EasyPost
SmartyHeld
Three alternativesLob, Melissa, PostGrid Address Verification
against: Google Maps
Smarty
Five alternativesByteplant Address Validator, Lob Address Verification, Loqate, Melissa Global Address Verification, PostGrid Address Verification
USPS Addresses API
Three alternativesLob, PostGrid Address Verification, Smarty
no first choiceagainst: DataFlow, Google Autocomplete, Melissa, Quadient, Shufti Pro, Sumsub, Veriff, getaddress.io
Mistral SmallExperian Address Validation, Melissa Global Address Verification
Two alternativesLoqate, PostGrid Address Verification
Google Maps Address Validation APIChanged
Three alternativesMelissa Address Validation API, PostGrid Address Validation API, USPS Address Validation API
Smarty
Five alternativesExperian Data Quality, Google Address Validation API, Lob, PostGrid Address Verification, Radar
AddressZen
Three alternativesGoogle Maps API Address Validation, Smarty, Whitepages
no first choiceagainst: Google Address Verification
DeepSeek V4 FlashSmarty
Three alternativesLoqate, Melissa, PostGrid Address Verification
SmartyHeld
Four alternativesGoogle Address Validation, Lob, Loqate, Melissa
Smarty
Six alternativesEasyPost Address Verification, Ideal Postcodes, Lob, Loqate, Melissa, PostGrid Address Verification
against: Google Address Validation API
Smarty
Three alternativesMelissa, PostGrid Address Verification, USPS Address APIs
against: Google Maps Address Validation API
no first choiceagainst: AU10TIX, Experian Address Verification, Lob, Veriff, getaddress.io
Llama 4 Maverickno first choiceMelissaChanged
Two alternativesInformatica Data as a Service, PostGrid Address Verification
no first choiceSmartyno first choicenothing named
Qwen 3.7 FlashSmarty
Two alternativesLoqate, Melissa
SmartyHeld
Two alternativesMelissa, PostGrid Address Verification
Smarty
Two alternativesGoogle Maps Platform, Lob.com
against: Melissa
Google Maps Platform, Peppy Data Services
One alternativeRaven Software
against: OpenStreetMap, USPS Web Tools
Loqate, Melissa, Smarty
Two alternativesAfterShip, Shippo
against: Google Places API
nothing named
Kimi K2Smarty
Two alternativesLoqate, Melissa Global Address Verification
SmartyHeld
Three alternativesGoogle Address Validation, Loqate, Melissa
Smarty
Six alternativesExperian Data Quality, Google Address Validation, Lob, Loqate, Melissa Global Address Verification, PostGrid Address Verification
Google Address Validation API
Two alternativesRadar, Smarty
against: Experian Data Quality
no first choiceagainst: USPS Free Tool
GLM 4.7 FlashXSmarty
Three alternativesExperian Address Validation, Melissa, PostGrid Address Verification
SmartyHeld
One alternativeFetchify
against: Google Maps Platform
Melissa
Five alternativesFullContact, Loqate, PostGrid Address Verification, Postcoder, Smarty
Google Maps Address Validation, USPS Addresses 3.0 AP
Three alternativesAddressZen, Lob Address Verification, PostGrid Address Verification
against: Smarty Address Verification
no first choiceagainst: Google Maps API, OpenStreetMap, PostGrid Address Verification, USPS Address API
MiniMax M2.5Smarty
Two alternativesMelissa, PostGrid Address Verification
Google Address Validation API, Melissa Address VerificationChanged
Two alternativesPostGrid Address Verification, ShipStation
Lob, SmartyStreets
Three alternativesGoogle Address Validation API, Melissa, PostGrid Address Verification
Melissa, USPS Address Verification API
One alternativeSmarty
against: FreeGeoIP.live
no first choicenothing named
GPT-6 LunaSmarty
Three alternativesLob, Loqate, Melissa
SmartyHeld
Three alternativesGoogle Address Validation, Lob, Loqate
Google Address Validation API, Smarty
Three alternativesLob, Loqate, Melissa
against: USPS Addresses API
Smarty
Two alternativesGoogle's Address Validation API, Loqate
no first choiceagainst: BeenVerified, Google's Address Validation API, Spokeo, TruthFinder, USPS Address Validation API
Muse Glimmer 30BLoqate by gbg, Smarty
One alternativeMelissa Address Verification
SmartyChanged
Three alternativesGoogle Address Validation, Lob, Loqate
Smarty
Three alternativesLoqate, Melissa, PostGrid Address Verification
Lob Address Verification, PostGrid Address Verification
Two alternativesRadar, Smarty
no first choiceagainst: BeenVerified, Intelius, Onfido, Persona, Plaid, Spokeo, Sumsub, Tensocom, Whitepages
Bold is the first choiceAlternatives are counted; the count opens them.What the answer argued against

The record

One row per call: the version string exactly as returned, whether the model searched, sources cited, and latency. Full answer text is in the free responses file. Download the record
Eighty-four rows: every prompt, every model, every answer.
PromptModelVersion stringTime (UTC)SearchedSourcesLatency
Direct recommendationClaude Haiku 4.5claude-haiku-4-5-202510012026-10-05 00:10yes167 s
Direct recommendationGPT-5.4 minigpt-5.4-mini-2026-03-172026-10-05 00:17yes46 s
Direct recommendationGemini 3.5 Flashgemini-3.5-flash2026-10-05 00:44yes1428 s
Direct recommendationPerplexity Sonarsonar2026-10-05 00:10yes185 s
Direct recommendationGrok 4.1 Fastspacexai/grok-4.1-fast-non-reasoning via vertex2026-10-04 22:22yes2312 s
Direct recommendationMistral Smallmistral/mistral-small via mistral2026-10-05 01:00yes147 s
Direct recommendationDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-10-04 23:44yes2342 s
Direct recommendationLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-10-05 00:45yes52 s
Direct recommendationQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-10-05 00:19no024 s
Direct recommendationKimi K2moonshotai/kimi-k2 via novita2026-10-04 23:43yes1419 s
Direct recommendationGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-10-04 23:22yes1356 s
Direct recommendationMiniMax M2.5minimax/minimax-m2.5 via minimax2026-10-04 23:37yes2133 s
Direct recommendationGPT-6 Lunagpt-6-luna2026-10-04 22:24yes413 s
Direct recommendationMuse Glimmer 30Bmeta/muse-glimmer-30b via togetherai2026-10-05 00:54yes1416 s
ParaphraseClaude Haiku 4.5claude-haiku-4-5-202510012026-10-05 00:42yes169 s
ParaphraseGPT-5.4 minigpt-5.4-mini-2026-03-172026-10-05 00:37yes34 s
ParaphraseGemini 3.5 Flashgemini-3.5-flash2026-10-05 00:53yes722 s
ParaphrasePerplexity Sonarsonar2026-10-05 00:42yes192 s
ParaphraseGrok 4.1 Fastspacexai/grok-4.1-fast-non-reasoning via vertex2026-10-04 22:23yes239 s
ParaphraseMistral Smallmistral/mistral-small via mistral2026-10-05 00:56yes56 s
ParaphraseDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-10-05 00:19yes2445 s
ParaphraseLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-10-04 22:10yes52 s
ParaphraseQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-10-04 23:43yes527 s
ParaphraseKimi K2moonshotai/kimi-k2 via novita2026-10-04 23:06yes1012 s
ParaphraseGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-10-04 22:58yes2331 s
ParaphraseMiniMax M2.5minimax/minimax-m2.5 via minimax2026-10-05 00:47yes516 s
ParaphraseGPT-6 Lunagpt-6-luna2026-10-05 00:30yes517 s
ParaphraseMuse Glimmer 30Bmeta/muse-glimmer-30b via togetherai2026-10-04 22:10yes1519 s
ComparativeClaude Haiku 4.5claude-haiku-4-5-202510012026-10-05 00:21yes109 s
ComparativeGPT-5.4 minigpt-5.4-mini-2026-03-172026-10-04 23:37yes47 s
ComparativeGemini 3.5 Flashgemini-3.5-flash2026-10-04 23:47yes1425 s
ComparativePerplexity Sonarsonar2026-10-04 22:22yes166 s
ComparativeGrok 4.1 Fastspacexai/grok-4.1-fast-non-reasoning via vertex2026-10-04 23:23yes229 s
ComparativeMistral Smallmistral/mistral-small via mistral2026-10-04 23:17yes98 s
ComparativeDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-10-04 22:33yes2152 s
ComparativeLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-10-05 00:42yes52 s
ComparativeQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-10-05 00:10no035 s
ComparativeKimi K2moonshotai/kimi-k2 via novita2026-10-05 00:09yes1931 s
ComparativeGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-10-04 23:42yes2392 s
ComparativeMiniMax M2.5minimax/minimax-m2.5 via minimax2026-10-04 23:45yes1035 s
ComparativeGPT-6 Lunagpt-6-luna2026-10-04 22:25yes619 s
ComparativeMuse Glimmer 30Bmeta/muse-glimmer-30b via togetherai2026-10-04 22:20yes1321 s
Budget constrainedClaude Haiku 4.5claude-haiku-4-5-202510012026-10-05 00:15yes96 s
Budget constrainedGPT-5.4 minigpt-5.4-mini-2026-03-172026-10-05 00:08yes36 s
Budget constrainedGemini 3.5 Flashgemini-3.5-flash2026-10-05 00:27yes1222 s
Budget constrainedPerplexity Sonarsonar2026-10-05 00:16yes153 s
Budget constrainedGrok 4.1 Fastspacexai/grok-4.1-fast-non-reasoning via vertex2026-10-05 00:14yes239 s
Budget constrainedMistral Smallmistral/mistral-small via mistral2026-10-05 00:32yes55 s
Budget constrainedDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-10-04 22:57yes2329 s
Budget constrainedLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-10-04 22:19yes52 s
Budget constrainedQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-10-05 00:21no028 s
Budget constrainedKimi K2moonshotai/kimi-k2 via novita2026-10-04 23:27yes1432 s
Budget constrainedGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-10-04 23:47yes1388 s
Budget constrainedMiniMax M2.5minimax/minimax-m2.5 via minimax2026-10-04 23:45yes1334 s
Budget constrainedGPT-6 Lunagpt-6-luna2026-10-04 23:57yes39 s
Budget constrainedMuse Glimmer 30Bmeta/muse-glimmer-30b via togetherai2026-10-04 23:06yes1315 s
Scale constrainedClaude Haiku 4.5claude-haiku-4-5-202510012026-10-05 00:01no012 s
Scale constrainedGPT-5.4 minigpt-5.4-mini-2026-03-172026-10-04 23:50no06 s
Scale constrainedGemini 3.5 Flashgemini-3.5-flash2026-10-04 22:35yes1025 s
Scale constrainedPerplexity Sonarsonar2026-10-04 23:52yes195 s
Scale constrainedGrok 4.1 Fastspacexai/grok-4.1-fast-non-reasoning via vertex2026-10-05 00:19yes129 s
Scale constrainedMistral Smallmistral/mistral-small via mistral2026-10-05 00:32no08 s
Scale constrainedDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-10-04 23:09yes2243 s
Scale constrainedLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-10-04 22:44yes54 s
Scale constrainedQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-10-04 23:32no027 s
Scale constrainedKimi K2moonshotai/kimi-k2 via novita2026-10-04 23:13yes1956 s
Scale constrainedGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-10-04 23:07yes2248 s
Scale constrainedMiniMax M2.5minimax/minimax-m2.5 via minimax2026-10-04 22:12yes513 s
Scale constrainedGPT-6 Lunagpt-6-luna2026-10-04 23:18yes214 s
Scale constrainedMuse Glimmer 30Bmeta/muse-glimmer-30b via togetherai2026-10-05 00:29yes1316 s
Negative framingClaude Haiku 4.5claude-haiku-4-5-202510012026-10-04 22:58yes3514 s
Negative framingGPT-5.4 minigpt-5.4-mini-2026-03-172026-10-04 22:32no05 s
Negative framingGemini 3.5 Flashgemini-3.5-flash2026-10-04 23:03yes1726 s
Negative framingPerplexity Sonarsonar2026-10-04 22:51yes204 s
Negative framingGrok 4.1 Fastspacexai/grok-4.1-fast-non-reasoning via vertex2026-10-05 00:34yes2312 s
Negative framingMistral Smallmistral/mistral-small via mistral2026-10-05 00:26yes56 s
Negative framingDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-10-04 23:40yes1946 s
Negative framingLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-10-04 22:39yes52 s
Negative framingQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-10-05 00:23no028 s
Negative framingKimi K2moonshotai/kimi-k2 via novita2026-10-04 23:36yes2422 s
Negative framingGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-10-05 00:12yes2059 s
Negative framingMiniMax M2.5minimax/minimax-m2.5 via minimax2026-10-05 00:05yes1930 s
Negative framingGPT-6 Lunagpt-6-luna2026-10-04 23:27yes516 s
Negative framingMuse Glimmer 30Bmeta/muse-glimmer-30b via togetherai2026-10-05 00:41yes2526 s

Normalization in this category

Every judgment call made between the raw labels and the numbers above, listed so it is visible and reversible.

ShowHide
Category-scoped readings
Experian read as Experian Data Quality
Google read as Google Maps
PostGrid read as PostGrid Address Verification
Postgrid read as PostGrid Address Verification
Unresolved, counted raw
AVS for card payments
AddressDoctor
AfterShip
Autoaddress
DataFlow
DataMatch
EasyPost Address Verification
FreeGeoIP.live
Geoapify
Google Autocomplete
Google Maps Platform
Google Maps Platform (Places API)
Google Places Autocomplete API
Incognia
Intelius
Lob.com
Loqate Address Verification
Loqate Verify
Loqate by gbg
Melissa Address Validation API
PAV – Postal Address Verification
Peppy Data Services
Placekey
Plaid
PostGrid Address Validation API
Postio
Raven Software
Smarty Address Verification
SnapAddress
StrikeIron
Tensocom
TruthFinder
Twilio Verify
USPS Address APIs (Official)
USPS Address Verification API
USPS Addresses 3.0 AP
USPS Free Tool
USPS-based tools / USPS validation
Vepler
Discontinued, still offered
No shut-down product was recommended here.

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