# VertexSMS, contact us, High-volume senders and custom rate inquiries, POST /numberCorrection: Phone validation API

> VertexSMS is the routing layer between your application and mobile operators in 200+ countries. One API, direct interconnects, live telemetry, and real people - not chatbots.

VertexSMS's High-volume senders and custom rate inquiries plan lets you call the phone validation API. We check each provider's docs for 9 fields. VertexSMS's docs list 3: Number, Type, Place.
We haven't run VertexSMS through [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt) yet.
VertexSMS gives this plan's price on request. We rank 1,342 plans for phone validation APIs by price. Half the plans cost $3.867 or less per 1,000 phones.
[GuGuData's CNY 124 (about $19) monthly plan](https://datacircle.dev/validate-phone-apis/gugudata/cny-124-monthly/llms.txt) is the cheapest paid plan per 1,000 phones. GuGuData's CNY 124 (about $19) monthly plan charges nothing per call. You get as many phones as GuGuData's rate limit allows. [Keyronne's pay-as-you-go plan](https://datacircle.dev/validate-phone-apis/keyronne/pay-as-you-go/llms.txt) costs the least for 10,000 phones a month: $0.20.
[Trestle](https://datacircle.dev/validate-phone-apis/trestle/top-up-from-10-self-serve-pay-as-you-go-get-3-0-phone-intel-phone-validation-api/llms.txt), [Signal House](https://datacircle.dev/validate-phone-apis/signal-house/top-up-from-10/llms.txt) and [Data247](https://datacircle.dev/validate-phone-apis/data247/12-pack-membership-get-v3-0-verify247-phone/llms.txt) are the best phone validation API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-phone-apis/vertexsms/contact-us-high-volume-senders-and-custom-rate-inquiries-post-numbercorrection
- [Phone validation API in 2026: the best of 60+ compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://vertexsms.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing#pricing
- Request: `POST https://api.vertexsms.com/numberCorrection`
- API key: with the plan, on https://vertexsms.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing#pricing
- Its API docs: https://vertexsms.com/en/api/other?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Sold by: VertexSMS (https://vertexsms.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 33%
- Number: ✓
- Type: ✓
- Place: ✓

## Price

- Billing: contact

## Aggregators

- Aggregators: none

## In their words

- Their pitch: VertexSMS is the routing layer between your application and mobile operators in 200+ countries. One API, direct interconnects, live telemetry, and real people - not chatbots.

## Data

- What it checks: numbering plan
- Keep data: no limit
- Use data: The User will only use the SMS Message Platform for legitimate purposes under this Agreement and the instructions provided on the website [...] You may not use the Services or permit the Services to be used by any competitor of Vertex or any other service provider which performs services substantially similar to Vertex’s Services without our prior written consent. You shall not resell the Services to third parties or accept any form of compensation or financial gain from third parties for the use of the Services, or for allowing third parties to use the Services, without our prior written consent.

## Speed

- Answer: in the call

## The call

- You send: Number, CountryIso. Optional: nothing optional
- Method: POST
- Path: /numberCorrection

## About the plan

- Plan: High-volume senders and custom rate inquiries
- Who can get it: anyone aged 18 or over with the legal capacity to sign the agreement, and not a competitor of Vertex

## The 6 fields the plan's answer can hold

error description, original number, number type, country, is mobile, E.164 number

## VertexSMS's plans (1)

- [VertexSMS, contact us, High-volume senders and custom rate inquiries, POST /numberCorrection](https://datacircle.dev/validate-phone-apis/vertexsms/contact-us-high-volume-senders-and-custom-rate-inquiries-post-numbercorrection/llms.txt): 33% complete

## VertexSMS's calls (2)

- `POST /numberCorrection`: [VertexSMS, contact us, High-volume senders and custom rate inquiries, POST /numberCorrection](https://datacircle.dev/validate-phone-apis/vertexsms/contact-us-high-volume-senders-and-custom-rate-inquiries-post-numbercorrection/llms.txt)
- `POST /hlr`: [VertexSMS, contact us, High-volume senders and custom rate inquiries, POST /hlr](https://datacircle.dev/validate-phone-apis/vertexsms/contact-us-high-volume-senders-and-custom-rate-inquiries-post-hlr/llms.txt)

## VertexSMS's APIs (1)

- [VertexSMS: phone validation API pricing, 1 plan, POST /numberCorrection](https://datacircle.dev/validate-phone-apis/vertexsms/contact-us-high-volume-senders-and-custom-rate-inquiries-post-numbercorrection/llms.txt)

## VertexSMS: phone validation API alternatives

- [Trestle, contact us, Enterprise, GET /2.0/real_contact, Real Contact API](https://datacircle.dev/validate-phone-apis/trestle/contact-us-enterprise-get-2-0-real-contact-real-contact-api/llms.txt): 33% complete, stored
- [TPSClear, contact us, 1,000,000+ washes](https://datacircle.dev/validate-phone-apis/tpsclear/contact-us-1000000-washes/llms.txt): 33% complete
- [Databar, contact us](https://datacircle.dev/validate-phone-apis/databar/contact-us/llms.txt): 33% complete, stored
- [Vonage, contact us, Specific pricing by country, POST /requests, Current Carrier insight](https://datacircle.dev/validate-phone-apis/vonage/contact-us/llms.txt): 33% complete, live

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-09.

- https://vertexsms.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://vertexsms.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing#pricing
- https://vertexsms.com/en/api/authentication?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://vertexsms.com/en/api/hlr?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://vertexsms.com/en/api/other?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://vertexsms.com/en/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing