Address Verification API Benchmark

Sources · Edition 3 · 2026

Sources and citations

Every source used to produce the ranking and the 113-product directory, grouped by evidence tier, with a note on what each one supports. All accessed September 2026.

Published 16 September 2026 Sources 55 Evidence tiers 4

Tier 1Postal and standards authorities

Externally audited programmes. Treated as fact where a vendor's certification is verifiable against the authority's own material.

  1. USPS PostalPro, CASS certification. Definition of the Coding Accuracy Support System, what certification requires and its relationship to presort discounts. Supports all CASS references throughout the report.
  2. USPS PostalPro, NCOALink. Definition of National Change of Address move-update data and licensing tiers. Supports NCOA references for PostGrid and Melissa.
  3. USPS PostalPro, Delivery Point Validation. Definition of DPV and its distinction from address standardisation. Supports the DPV terminology entry and WinPure's standards list.
  4. Canada Post, Software Evaluation and Recognition Program. SERP definition and recognised-software criteria. Supports all SERP references.
  5. Royal Mail, Postcode Address File. PAF composition and licensing model. Supports UK vendor data-source claims for Data8, Postcoder and Fetchify.
  6. Australia Post, Address Matching Approval System. AMAS definition. Supports AMAS references for Experian and Loqate.
  7. Ordnance Survey, AddressBase. UK address gazetteer composition. Supports Data8's layered dataset claim.

Tier 2Comparison portals catalogued in full

Both category listings were catalogued end to end, not sampled. These are the source of every portal rating and review count in the report, and of the 113-product directory.

  1. G2, Address Verification category, page 1. Smarty 4.6 (339), PostGrid 5.0 (178), Melissa Global Address Verification 4.5 (196), Veriff 4.5 (60), Shufti 4.5 (153), Sumsub 4.6 (125), Plaid 4.2 (50), Lob 4.4 (281), ComplyCube 5.0 (70), Data8 4.9 (34), Postcoder 4.7 (61), Didit 4.8 (33), Autoaddress 4.8 (30), Informatica Data Quality & Observability 4.3 (65), AiPrise 4.7 (28).
  2. G2. page 2. DQE One 4.8 (39), AU10TIX 4.4 (39), Incognia 4.9 (36), Loqate 4.4 (46), Byteplant Address Validator 4.3 (23), FullCircl 4.5 (243), WinPure Clean & Match 4.7 (75), Fetchify 3.9 (22), Postcodes4u 4.2 (12), ApiCheck 4.3 (12), Stannp.com 4.8 (43), GeoPostcodes 4.4 (8), LexisNexis Keep Contact 4.4 (7), Placekey API 4.9 (6), AccuMail Verify 4.5 (5).
  3. G2. page 3. BCC Address Standardization 3.5 (5), freegeoip.live 4.1 (5), Address Guard 4.4 (4), Ideal Postcodes 4.9 (4), Pataa 4.8 (4), AddressZen Address Lookup 3.3 (3), Experian Address Validation 4.2 (3), Geocodio 4.8 (5), 360Science 4.0 (3), CDYNE 4.5 (2), Compliancely 4.0 (2), WinPure Address Verification 3.5 (2), World Geocoder for ArcGIS 3.3 (2), AccuMail Frameworks 5.0 (1), Addrexx 4.5 (1). Also the source for Experian's stated coverage of 250 countries and territories.
  4. G2. page 4. Anchor Computer 5.0 (1), Checkboard 5.0 (1), Egon 3.5 (1), Global-Z 5.0 (1), MyDataQ 5.0 (2), Firstclasspostcodes Postcode Lookup API 5.0 (2), SAP Data Services 4.0 (32), Service Objects DOTS 2.5 (1), Precisely Spectrum Global Addressing 4.0 (1), TrueNCOA 5.0 (1) with flat $20-per-file pricing, plus zero-review listings for APITier Address Agent, Xtropy Addresser, Addressfinder, AddressPro with GeoCode and Ekata Address Risk API.
  5. G2. page 5. Hopewiser Address Validation Software, Address Validator Plus, Address Verifier, AFD Software, AutoPostcode, Cotality, Acme Data Data Studio, DataTools, Enhanced Address Finder and three Experian UK listings, all zero-review; plus deepidv 5.0 (17) and Innovative Systems Enlighten 5.0 (2).
  6. G2. page 6. Four further Experian UK listings, Fetchify's second listing, FindMyStay, GeoWyse, iAddress and iAddress Flex, Launify, Microbilt Address Search, Oni AVW, Placevy, PostalDataPI and Postcode.eu Address APIs, all zero-review; plus Identomat 5.0 (2).
  7. G2. page 7. Postcoder duplicate, Postio, PostLocate, Simplegeoapi, SimplShip, sthan.io, Swiftcomplete by what3words, Precisely Trillium Geolocation, TrustVerify, Fetchify UK Postcode Lookup, Zipcodebase, Zip-Codes API and ZipSmart, all zero-review. Confirms the category total of 103 listings.
  8. Capterra, Address Verification Software, all 25 listings. Smarty 4.9 (91), PostGrid 5.0 (28), Melissa Global Address Verification 0.0 (0), GeoPostcodes 5.0 (4), Plaid 4.4 (106), Geocodio 5.0 (80), Sumsub 4.7 (70), Twilio User Authentication 4.8 (52), Shufti 4.2 (45), MAILERS+4 4.4 (43), Woosmap 4.7 (34), SmartAddresser 4.6 (34), Postalytics 4.3 (33), Addressfinder 4.7 (27), Byteplant 4.5 (19), ComplyCube 5.0 (10), Lob 4.4 (9), Melissa Data Quality Suite 4.3 (6), Magento 2 Product Designer 4.0 (6), Informatica Data Quality 4.3 (4), iBridge 4.3 (4), Placekey 5.0 (3), AU10TIX 5.0 (3), Veriff 4.7 (3), iAddress 5.0 (2).
  9. The CTO Club, Best Address Verification Software Reviewed. Editorial shortlist naming Informatica, Experian, Whitepages, Lob, EasyPost, Loqate, Melissa, PostGrid, Smarty and Incognia. Used for category framing and to confirm the shortlist did not omit an established vendor.
  10. LinkedIn, Address Verification Software products. Used for vendor product-line confirmation, including PostGrid's 245+ country coverage and Loqate's split between Verify and Capture.

Tier 3Vendor primary documentation

Product, pricing, trust and documentation pages. Reported as vendor claims with attribution, not as verified fact.

  1. PostGrid, Address Verification API. Supports: 245+ countries and territories; CASS, SERP and NCOA certification; SOC 2 Type 2, HIPAA, PIPEDA, GDPR and PCI-DSS; 99.9% uptime; 120 requests per minute; 500 free lookups; bulk verification to 1M addresses with a two-hour window; cURL, Node.js, Python, PHP and Ruby examples; SSO, RBAC, audit logs, AWS hosting and third-party penetration testing.
  2. Experian Data Quality. Supports: global coverage; CASS, SERP and AMAS certification; cloud and on-premises deployment; quote-only pricing model.
  3. Informatica, Data as a Service. Supports: 240+ countries and territories; postal certifications from leading global postal organisations; combined address, email and phone validation; parsing, analysis, geocoding and local-standard formatting; cloud delivery.
  4. Smarty, US Address Verification. Supports: US and Canada core coverage against USPS and Canada Post; up to 55 metadata points; SmartyKey persistent identifiers; 20 million non-USPS addresses; AICPA SOC 2 and USPS CASS certification; 42-day 1,000-lookup trial with no card; pricing from $50 per month for 1,000 lookups; open-source SDKs in 15+ languages; 25,000 addresses per second on standard plans; SLA of 99.98% of single lookups under 500ms.
  5. Smarty, International Address Verification. Supports: international coverage sold as a separate product spanning 195 countries plus territories.
  6. Melissa, Address Verification. Supports: 240+ countries and territories across 233 postal systems; proprietary CASS and SERP certified engine; multi-language support with Latin transliteration; real-time and batch processing; geocoding, NCOA and autocomplete; latency of 30 to 150ms for Latin-character addresses and 50 to 500ms for non-Latin.
  7. WinPure, Address Verification Software. Supports: 250+ countries; CASS, DPV, RDI and ZIP+4 support; geocoding append; no-code interface; exportable before-and-after reports; Cyber Essentials certification and DAMA membership; on-premises deployment; 30-day trial with no card; 97% data matching accuracy claim; England Hockey case study citing mailing returns falling from 10% to under 1%.
  8. Loqate, Address Verification. Supports: 250 countries and territories; transliteration across 8 scripts; premise-level data; CASS, SERP and AMAS certification; Capture type-ahead under 150ms; average 7% match-rate uplift globally and up to 19% in developing countries; cloud, private cloud and Kubernetes on-premises deployment; integrations including Shopify Plus, Salesforce, Adobe Commerce, BigCommerce, commercetools and Microsoft Dynamics; freemium tier and no-card trial.
  9. Radar, Address Verification API. Supports: free to 100,000 requests per month; $0.50 per 1,000 requests beyond; positioning at 50 to 90% below Google Maps and Mapbox; SOC 2 Type II certification and GDPR compliance; 195+ country geocoding coverage; USPS datasets for US validation; forward, reverse and IP geocoding, autocomplete, routing and base maps.
  10. Data8, Address Validation. Supports: UK-only coverage; Royal Mail PAF plus Ordnance Survey AddressBase; 500,000+ Not-Yet-Built records; 800,000+ Multiple Residence records; PredictiveAddress component search; fuzzy matching; 14-day trial with 100 credits and no card; integrations including Salesforce, Microsoft Dynamics, Shopify, Magento, WordPress, PrestaShop, OpenCart, Formstack and Unbounce.
  11. Postcoder. Supports: address lookup, bank sort-code and account validation, email validation with disposability detection, mobile validation and SMS OTP verification; ISO 9001:2015 and Cyber Essentials certification; G2 rating of 4.7 out of 5 with 2026 badges for Leader, Easiest to Use, Best Results, Most Implementable, Fastest Implementation and Highest User Adoption; Devportal Awards 2024 for Best Served API Business Model; UK and selected other country coverage including France; free trial.
  12. Fetchify. Supports: 250 countries and territories for address autocomplete; UK postcode lookup on Royal Mail PAF updated daily; email and phone validation; bank account validation against EISCD; 20+ ready-made platform plugins and a developer SDK; integrations including Shopify, Magento, BigCommerce, WooCommerce, Microsoft Dynamics 365, Salesforce and PrestaShop; 30-day trial with 1,000 free credits and no card; out-of-hours emergency support; ownership by ClearCourse Business Services Limited.
  13. Byteplant, Address Validator. Supports: 240+ countries against official postal reference data; fuzzy autocomplete; CSV and Excel bulk validation; duplicate detection; geocoding enrichment; GDPR compliance with servers exclusively in the EU and data deletion within 14 days; German company operating since 2003; 60+ integrations; 100-address free trial with no card; customer references including Allianz, Adobe, Toyota and the Washington Post.
  14. Lob, Address Verification. Supports: 240+ global territories; USPS CASS certification; deliverability scoring and confidence metrics; ZIP+4, carrier route and building type components; vacancy and building-type detection; autocorrect and autocomplete for web forms; SDKs in cURL, TypeScript, Node, Ruby, Python, PHP, Java, Elixir and C#; the claim that 20% of addresses entered online contain mistakes; case studies citing 50% reductions in failed mailings; free trial with pricing on a separate page.
  15. AddressZen. Supports: 240+ countries and 60+ languages; 750M+ address database; USPS CASS and ISO 27001 certification; 99.99% uptime claim; JavaScript and React libraries plus REST API; documented integrations for Claude Code, GitHub Copilot, Cursor, Windsurf, Lovable, Replit, v0, base44 and Leap.new; use of authoritative local sources such as USPS rather than crowd-sourced data; free trial.
  16. Precisely, Spectrum Global Addressing. Supports: 220+ countries and territories; USPS CASS Cycle O certification; PreciselyID persistent identifier for record linkage; address autocompletion and machine-learning matching; SDKs for Java, COM, C, .NET and C++ plus REST; SaaS, on-premises and cloud-native Kubernetes and Spark deployment; parcel and structure level positional accuracy.
  17. SAP Data Services. Supports: global address cleansing and geocoding within SAP's data integration and quality platform; licensed postal directories; batch and real-time processing.
  18. LexisNexis Risk Solutions, Keep Contact. Supports: public-records repository enrichment; proprietary LexID linking technology; HPCC computing platform; US-centric membership and customer file cleansing.
  19. Geocodio. Supports: US, Canada, Mexico and UK coverage; forward and reverse geocoding; address standardisation, correction and completion; Census demographics, congressional and school district and timezone enrichment; driving-distance calculation; batch processing and spreadsheet upload; SOC 2 Type II audited annually; GDPR compliance; data encrypted in transit with enterprise data encrypted at rest and held in the US; on-premises deployment; 99.99% uptime across billions of lookups.
  20. Woosmap. Supports: 800M addresses and points of interest from official providers; single-field capture with building-entrance precision; PAF-grade UK data and rooftop precision globally; claimed up to 35% mobile checkout conversion uplift; 10,000 free requests per month with published per-1K pricing; REST plus native SDKs for iOS, Android, Flutter and React Native; GDPR compliance with an explicit no-advertising data policy; 99.9% enterprise SLA.
  21. Autoaddress. Supports: key role maintaining Ireland's Eircode database; 250+ countries using Eircode, Royal Mail, USPS and TomTom data; Capture, Verify and Cleanse products; ISO 27001:2022 certification and FSQS accreditation; zero-data-retention policy on API products; 14-day trial with 150 validations and no card; native integrations for Shopify, BigCommerce, AB Commerce and EvolutionX.
  22. DQE One. Supports: real-time validation, standardisation, deduplication and enrichment of postal address, email and phone data; French-market specialism. English-language technical documentation was not reachable at review, which is reflected in the vendor's evidence-based scores.
  23. Ideal Postcodes. Supports: UK address validation, postcode lookup, cleansing, phone and email validation; UPRN coordinates and rooftop geocodes as standard; Address Finder with autofill, fuzzy matching and screen-reader accessibility; UK PAF plus per-country international sources; ISO 27001:2022 certification; public status page; 30+ integrations plus an Excel add-in; one-month trial with 50 credits and no card.
  24. Addressfinder. Supports: Australia and New Zealand coverage built on Australia Post PAF, GNAF, NZ Post and LINZ; autocomplete, verification, bulk verification, email and phone validation, reverse geocoding and points of interest; JavaScript widget, API, bulk portal and WooCommerce, BigCommerce and HubSpot plugins; SOC 2 Type 2 with SAML SSO, OAuth2 and IP allowlisting; 3bn+ lookups processed and a 99.999% all-time API uptime claim; case study citing validation rising from 60% to over 98%; 30-day trial with no card.
  25. Service Objects DOTS. Supports: operating since 2001; address validation and standardisation; geocoding claiming up to 99.8% accuracy; US NCOA; lead, phone, email, name and IP validation; CASS certification, SOC 2, PCI, GDPR and CCPA/CPRA compliance; 99.999% uptime guarantee; 24/7/365 support; NuGet packages and sample libraries.
  26. GeoPostcodes. Supports: 247 countries and territories; 9.3M postal codes, 316K administrative areas, 4M cities, 15.9M coordinates, 880K boundary polygons, 299 languages and 55 years of population estimates; street-level data in 81 countries and house-number precision in 51; CSV delivery plus Snowflake, Azure Data Share and AWS sync; annual licence model; ISO 20022 alignment; Amazon and DB Schenker as referenced customers.
  27. SmartSoft, AccuMail. Supports: full USPS CASS certification; real-time postal address verification via REST and SOAP; AccuMail Frameworks for embedded use; US-only coverage.
  28. Hopewiser. Supports: claim to be the first UK company providing addressing software; Royal Mail PAF plus Ordnance Survey and Companies House data; UK and Australia coverage with international partners; address validation, lookup, autocomplete, cleansing, email and bank validation; GDPR compliance, FSQS certification and Ordnance Survey Partner status; cloud, on-premises and bureau delivery; CRM integrations including Salesforce, Dynamics and Sage.
  29. Postcode.eu. Supports: 14 European countries; autocomplete, validate and Dutch postcode APIs; national cadastre and postal company sources; ISO/IEC 27001:2022 certification; GDPR compliance and EU hosting; annual tiers from €50 to €1,000 with per-country rates of roughly €0.012 to €0.063 per validation; six-month capped free testing; optional DORA addendum at €2,500 per year and optional SLA from €1,000; plugins for Magento, WooCommerce, Shopware and OpenCart; SDKs for PHP, Perl and Python.
  30. Incognia. Supports: mobile location behaviour used to assess address authenticity; SOC 2 compliance; fraud prevention and onboarding use cases.
  31. Placekey. Supports: free and open universal place identifier; What@Where format built on Uber's H3 hexagonal grid at roughly 15,000 square metres per hexagon; free REST API with key registration; integrations with CARTO, Esri and SafeGraph.

Tier 4Secondary market coverage

Consulted for market context and to check that no significant vendor or claim had been missed. Not used as a scoring input.

  1. PostGrid, Alternatives and comparisons. Vendor-authored competitive material, read for claim-checking rather than evidence.
  2. Smarty, Melissa address validation alternatives. Vendor-authored competitive material. Source of the Melissa proprietary-engine and 233-postal-system detail, cross-checked against Melissa's own pages.
  3. G2, PostGrid vs Smarty comparison. Side-by-side user-reported feature and satisfaction data.
  4. GlobeNewswire, Melissa address engine certified by Canada Post. Corroborates Melissa's SERP certification history.

NotesOn citation practice

  • Access dates. All URLs were accessed in September 2026. Vendor pages change without notice and without version history, so a claim cited here may no longer appear at the same URL.
  • Attribution. Where a figure originates with a vendor, the report says so in the sentence that uses it. Accuracy percentages, uptime figures, latency ranges and case-study outcomes are vendor claims unless attributed to a postal authority or an audited certification.
  • Competitive material. Tier 4 includes vendor-authored comparison pages. These were read to identify claims worth checking against primary sources, never treated as neutral evidence.
  • Absence of a citation. Where the capability matrix shows a dash, it means the vendor does not publish that figure in a place a buyer can find without a sales call. It does not mean the capability is absent.
  • Portal listings are cited as listings, not as endorsements. A product appears in the directory because G2 or Capterra placed it in the address verification category. For twenty-two entries the report states explicitly that the categorisation looks wrong.
  • Review counts move. Every rating and count cited here is a September 2026 snapshot. G2 and Capterra figures change continuously and neither portal publishes a version history, so these numbers cannot be reproduced exactly at a later date.

See how these sources were weighted in the scoring rubric →