# Openapi.com, top-up, Single request, POST /mobile-start/{mobile-phone-number}: Phone validation API

> The Mobile Number Verification service allows you to verify the validity of a mobile phone number in seconds and on a global scale.

Openapi.com's phone validation API on its Single request plan. It costs $43.887 per 1,000 phones. It returns 7 of the 9 key fields we check: Number, Formats, Validity, Type, Carrier, Porting and roaming, Place.
€39.00 per 1,000 is $43.887, at the European Central Bank's $1.1253 for €1.
Half of the 237 plans we rank by price cost $5.401 per 1,000 or less. This plan costs less than 11% of the 237 plans.
The cheapest plan we rank by price is [Twilio, top-up](https://datacircle.dev/validate-phone-apis/twilio/top-up/llms.txt), at $0.00 per 1,000.

- This page: https://datacircle.dev/validate-phone-apis/openapi-com/top-up-single-request-post-mobile-start-mobile-phone-number
- [Best phone validation API in 2026](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://openapi.com/pricing
- Its API docs: https://console.openapi.com/apis/trust/documentation#scope=POST:trust.openapi.com/mobile-start
- Sold by: Openapi.com (https://openapi.com)
- Checked: 2026-10-25

## In the answer

- Completeness: 78%
- Number: ✓
- Formats: ✓
- Validity: ✓
- Type: ✓
- Carrier: ✓
- Porting and roaming: ✓
- Place: ✓

## Price

- $ per 1,000: $43.887
- Billing: pay first

## Aggregators

- Aggregators: none

## Charges

- Per: call
- Also pays for: from the same budget: API Services

## In their words

- Their pitch: The Mobile Number Verification service allows you to verify the validity of a mobile phone number in seconds and on a global scale.

## Data

- Freshness: live
- Keep data: no limit
- Use data: The data and information provided by Openapi are for the exclusive use of the Customer, who is prohibited from copying, reproducing, assigning to third parties on any grounds and/or using them for purposes other than those expressly established in the Agreement, unless expressly authorised by Openapi and subject to the Customer undertaking to comply with the instructions provided. In particular, to obtain such authorisation, the Customer must provide Openapi with assurances: (i) that it has informed its customers that the data they provide will be transmitted to third parties for the provision of the requested service, (ii) that it has adopted an adequate privacy policy and processes its customers’ data according to security and confidentiality standards no lower than those offered by Openapi’s Privacy Policy, (iii) that it adopts all measures required by applicable law or otherwise suitable to preserve the confidentiality and security of the data provided by its customers. [...] The Customer is also prohibited from: [...] (v) using the APIs and/or the Services for purposes or in a manner that causes damage to Openapi, the Suppliers or third parties and/or violates any provision of law [...]

## Plan

- Expires: 12 months after the last top-up

## Rate limit

- Per second: 166.67
- Batch: 1

## Speed

- Answer: in the call or by polling

## The call

- You send: mobile-phone-number. Optional: callback
- Method: POST
- Path: /mobile-start/{mobile-phone-number}

## About the plan

- Plan: Single request
- Who can get it: anyone acting in the course of their business, entrepreneurial or professional activity

## The 20 fields the plan's answer can hold

request ID, requested number, formatted number, possible number, valid number, region code, valid for region, number type, network, original network, roaming, ported, country, country prefix, details, request state, created at, updated at, message, success

## Openapi.com's plans (16)

- [Openapi.com, top-up, Single request, POST /mobile-start/{mobile-phone-number}](https://datacircle.dev/validate-phone-apis/openapi-com/top-up-single-request-post-mobile-start-mobile-phone-number/llms.txt): $43.887 per 1,000, 78% complete, live
- [Openapi.com, €45 monthly](https://datacircle.dev/validate-phone-apis/openapi-com/45-monthly/llms.txt): $50.639 per 1,000, 78% complete, live
- [Openapi.com, €190 monthly](https://datacircle.dev/validate-phone-apis/openapi-com/190-monthly/llms.txt): $42.761 per 1,000, 78% complete, live
- [Openapi.com, €290 monthly](https://datacircle.dev/validate-phone-apis/openapi-com/290-monthly/llms.txt): $54.39 per 1,000, 78% complete, live
- [Openapi.com, €500 monthly](https://datacircle.dev/validate-phone-apis/openapi-com/500-monthly/llms.txt): $28.133 per 1,000, 78% complete, live
- [Openapi.com, €950 monthly](https://datacircle.dev/validate-phone-apis/openapi-com/950-monthly/llms.txt): $21.381 per 1,000, 78% complete, live
- [Openapi.com, €540 yearly](https://datacircle.dev/validate-phone-apis/openapi-com/540-yearly/llms.txt): $50.639 per 1,000, 78% complete, live
- [Openapi.com, €700 yearly](https://datacircle.dev/validate-phone-apis/openapi-com/700-yearly/llms.txt): $39.386 per 1,000, 78% complete, live
- [Openapi.com, €2,000 yearly](https://datacircle.dev/validate-phone-apis/openapi-com/2000-yearly/llms.txt): $28.133 per 1,000, 78% complete, live
- [Openapi.com, €2,280 yearly](https://datacircle.dev/validate-phone-apis/openapi-com/2280-yearly/llms.txt): $42.761 per 1,000, 78% complete, live
- [Openapi.com, €3,480 yearly](https://datacircle.dev/validate-phone-apis/openapi-com/3480-yearly/llms.txt): $54.39 per 1,000, 78% complete, live
- [Openapi.com, €5,000 yearly](https://datacircle.dev/validate-phone-apis/openapi-com/5000-yearly/llms.txt): $22.506 per 1,000, 78% complete, live
- [Openapi.com, €6,000 yearly](https://datacircle.dev/validate-phone-apis/openapi-com/6000-yearly/llms.txt): $28.133 per 1,000, 78% complete, live
- [Openapi.com, €10,000 yearly](https://datacircle.dev/validate-phone-apis/openapi-com/10000-yearly/llms.txt): $18.005 per 1,000, 78% complete, live
- [Openapi.com, €11,400 yearly](https://datacircle.dev/validate-phone-apis/openapi-com/11400-yearly/llms.txt): $21.381 per 1,000, 78% complete, live
- [Openapi.com, €25,000 yearly](https://datacircle.dev/validate-phone-apis/openapi-com/25000-yearly/llms.txt): $11.253 per 1,000, 78% complete, live

## Openapi.com's calls (3)

- `POST /mobile-advanced/{mobile-phone-number}`: [Openapi.com, top-up, Single request, POST /mobile-advanced/{mobile-phone-number}](https://datacircle.dev/validate-phone-apis/openapi-com/top-up-single-request-post-mobile-advanced-mobile-phone-number/llms.txt)
- `POST /phone-advanced/{phone-number}`: [Openapi.com, top-up, Single request, POST /phone-advanced/{phone-number}](https://datacircle.dev/validate-phone-apis/openapi-com/top-up-single-request-post-phone-advanced-phone-number/llms.txt)
- `POST /mobile-start/{mobile-phone-number}`: [Openapi.com, top-up, Single request, POST /mobile-start/{mobile-phone-number}](https://datacircle.dev/validate-phone-apis/openapi-com/top-up-single-request-post-mobile-start-mobile-phone-number/llms.txt)

## Openapi.com's APIs (2)

- [Openapi.com: email verification API pricing, 16 plans, POST /email-advanced/{email}](https://datacircle.dev/validate-email-apis/openapi-com/top-up-single-request-post-email-advanced-email/llms.txt)
- [Openapi.com: email verification API pricing, 16 plans, POST /email-start/{email}](https://datacircle.dev/validate-email-apis/openapi-com/top-up-single-request-post-email-start-email/llms.txt)
- [Openapi.com: phone validation API pricing, 16 plans, POST /mobile-start/{mobile-phone-number}](https://datacircle.dev/validate-phone-apis/openapi-com/top-up-single-request-post-mobile-start-mobile-phone-number/llms.txt)

## Openapi.com: phone validation API alternatives

- [Byteplant, $489.90 monthly](https://datacircle.dev/validate-phone-apis/byteplant/489-90-monthly/llms.txt): $48.99 per 1,000, 56% complete, live
- [Loqate, $100 pack](https://datacircle.dev/validate-phone-apis/loqate/100-pack/llms.txt): $50.00 per 1,000, 78% complete, live
- [Data8, £1,000 pack](https://datacircle.dev/validate-phone-apis/data8/1000-pack/llms.txt): $53.34 per 1,000, 56% complete, live
- [Listar, top-up from €10, Starter, POST /search/verify-phone-ownership](https://datacircle.dev/validate-phone-apis/listar/top-up-from-10-starter-post-search-verify-phone-ownership/llms.txt): $56.265 per 1,000, 67% 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 2026-10-25.

- https://console.openapi.com/apis/trust/documentation
- https://console.openapi.com/apis/trust/pricing
- https://legal.openapi.com/terms-and-conditions/term-and-condition-general-en.pdf
- https://openapi.com
- https://openapi.com/faq
- https://openapi.com/pricing