# USPS Address Validation API: how AI models rank it, November 2026

Gane Index, November 2026 Edition. Named in 4 judge labels across 1 category by 3 of 14 models. Page: https://www.gane.ai/index/gtm/vendors/usps-address-validation-api

## Standing by category

| Category | Share | Rank | Negative rate | Labels |
|---|---|---|---|---|
| [Address verification tools](https://www.gane.ai/index/gtm/gtm-data/address-verification/index.md) | 0% | 50 | 50% | 4 |

## What the models said for it

- "Mostly U.S. shipping: Compare USPS and Smarty; choose based on your integration needs" (GPT-6 Luna, Address verification)
- "you can use the official USPS API for free... Cons: Difficult to implement" (GLM 4.7 FlashX, Address verification)

## And against it

- "USPS API (Not recommended for production B2B)" (GLM 4.7 FlashX, Address verification)
- "Strict rate limits — currently documented at approximately 60 requests per hour ... making it unsuitable for high-volume applications" (Kimi K2, Address verification)

## By model

| Model | First choice | Alternative | Mention | Warning | Labels |
|---|---|---|---|---|---|
| Claude Haiku 4.5 | 0 | 0 | 0 | 0 | 0 |
| GPT-5.4 mini | 0 | 0 | 0 | 0 | 0 |
| Gemini 3.5 Flash | 0 | 0 | 0 | 0 | 0 |
| Perplexity Sonar | 0 | 0 | 0 | 0 | 0 |
| Grok 4.20 | 0 | 0 | 0 | 0 | 0 |
| Mistral Small | 0 | 0 | 0 | 0 | 0 |
| DeepSeek V4 Flash | 0 | 0 | 0 | 0 | 0 |
| Llama 4 Maverick | 0 | 0 | 0 | 0 | 0 |
| Qwen 3.7 Flash | 0 | 0 | 0 | 0 | 0 |
| Kimi K2 | 0 | 0 | 0 | 1 | 1 |
| GLM 4.7 FlashX | 0 | 1 | 0 | 1 | 2 |
| MiniMax M2.5 | 0 | 0 | 0 | 0 | 0 |
| GPT-6 Luna | 0 | 1 | 0 | 0 | 1 |
| Muse Glimmer 30B | 0 | 0 | 0 | 0 | 0 |

## Sources returned with these answers

The sites and pages cited by the answers that named USPS Address Validation API, from 11 of the 11 answers that named it (only the models that return a source list).

### Domains cited

- smarty.com: 8
- developers.google.com: 6
- postgrid.com: 6
- usps.com: 6 (its own site)
- loqate.com: 5
- g2.com: 4
- melissa.com: 4
- byteplant.com: 3
- capterra.co.uk: 3
- capterra.com: 3

### Pages cited

- https://loqate.com/en-us/address-verification: 4
- https://usps.com/business/web-tools-apis/address-information-api.htm: 4
- https://capterra.co.uk/directory/33215/address-verification/software: 3
- https://digi-texx.com/techblog/address-validation-software: 3
- https://loqate.com/en-us/address-validation-solution: 3
- https://mastercard.com/us/en/news-and-trends/Insights/2024/options-for-global-address-verification-solution-avs.html: 3
- https://postgrid.com/pricing-address-verification: 3
- https://smarty.com/pricing: 3

## Record

- Method: https://www.gane.ai/index/gtm/methodology
- License: CC BY 4.0. Cite as Gane Index, November 2026 Edition, www.gane.ai/index/gtm.