---
title: "Validates the given patent and application number combination"
method: GET
path: "/mntfee-services/v2/maintenancefee/validate"
tags: ["maintenanceFeeResource"]
---

# Validates the given patent and application number combination

`GET /mntfee-services/v2/maintenancefee/validate`

## Request

- Base URL: `https://fees.uspto.gov`
- URL: `https://fees.uspto.gov/mntfee-services/v2/maintenancefee/validate`
- Auth: none declared
- TypeScript: <https://skmtc.dev/uspto/apis/maintenance-fee-rest-api/docs/mntfee-services/v2/maintenancefee/validate/get.ts> (a function with typed inputs; its response is checked against the schema)

## Query parameters

- `patentNumber` string
- `applicationNumber` string

## Response `200`

OK

- MaintenanceFeeResponse
  - `success` boolean
  - `errorMessageText` string[]
  - `infoMessageText` string[]
  - `warnMessageText` string[]
  - `model` BaseModel[]
    - `version` integer
  - `errorCode` integer

## Changes

- **2026-11-07** `e9c1637ae9b0`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/uspto/apis/maintenance-fee-rest-api/changes/mntfee-services/v2/maintenancefee/validate/get.md)

---

[API](https://skmtc.dev/uspto/apis/maintenance-fee-rest-api.md) - [All operations](https://skmtc.dev/uspto/apis/maintenance-fee-rest-api/llms.txt) - [OpenAPI document](https://skmtc.dev/uspto/apis/maintenance-fee-rest-api/revisions/e9c1637ae9b0?raw)