# Sinch, contact us: Phone validation API

> Increase security, reduce costs, and optimize data travel. There’s no point in sending messages to outdated numbers – check first and send with confidence.

Sinch's phone validation API on its Contact sales plan. It returns 4 of the 9 key fields we check: Type, Carrier, Porting and roaming, Place.
We haven't run Sinch through [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt) yet.
Sinch gives this plan's price on request. We rank 888 plans for phone validation APIs by price. Half the plans cost $3.376 per 1,000 phones or less.
[Botoi's $199 monthly plan](https://datacircle.dev/validate-phone-apis/botoi/199-monthly/llms.txt) is the cheapest paid plan per 1,000 phones: as little as $0.0066. Botoi's $199 monthly plan covers up to 1,000,000 phones a day.
[Data247](https://datacircle.dev/validate-phone-apis/data247/12-pack-membership-get-v3-0-verify247-phone/llms.txt), [Foxentry](https://datacircle.dev/validate-phone-apis/foxentry/top-up-pay-as-you-go-post-phone-validate-validate-phone-number-extended/llms.txt) and [HLR Lookups](https://datacircle.dev/validate-phone-apis/hlr-lookups/top-up-1-1m-post-hlr-lookup/llms.txt) are the best phone validation API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-phone-apis/sinch/contact-us
- [Phone validation API: 40+ providers compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://sinch.com/phone-numbers/number-lookup-api/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Request: `POST https://lookup.api.sinch.com/v2/projects/{projectId}/lookups`
- API key: with the plan, on https://sinch.com/phone-numbers/number-lookup-api/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Its API docs: https://developers.sinch.com/docs/number-lookup-api-v2/api-reference/number-lookup-v2/numberlookupv2?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Sold by: Sinch (https://sinch.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-02

## In the answer

- Completeness: 44%
- Type: ✓
- Carrier: ✓
- Porting and roaming: ✓
- Place: ✓

## Price

- Billing: contact

## Aggregators

- Aggregators: none

## In their words

- Their pitch: Increase security, reduce costs, and optimize data travel. There’s no point in sending messages to outdated numbers – check first and send with confidence.

## Data

- Countries: Worldwide
- What it checks: numbering plan, carrier
- Keep data: Upon termination of the Service for any reason, [...] Customer agrees to destroy all copies of the Number Lookup Data in its possession and certify to Sinch as to such destruction.
- Use data: Sinch grants Customer, and Customer accepts from Sinch, a personal non-transferable and non-exclusive, term-based license and Right-To-Use (“RTU”) the Services, the Number Lookup Data, and any modified or enhanced data derived therefrom, solely for the following purposes: (i) to validate a consumer's identity for the purpose of averting fraudulent transactions, (ii) performing identity verification, (iii) authenticating commercial transactions initiated by a consumer with Customer, (iv) optimizing Customer's use of telecommunications services, including reducing costs of telecommunications, complying with applicable telecommunications rules, selecting a telecommunication service or service provider, (v) determine the validity of a TN, and (vi) billing. [...] Customer will not use the Services or Number Lookup Data (a) for marketing purposes or market analysis, (b) to resell or provide the Number Lookup Data to any third party, (b) to create a consumer report or allow use by a consumer reporting agency for the purpose of creating a consumer report, (c) for verifying credit worthiness or eligibility, insurance, or employment, (d) to augment or create a consumer segmentation database, or (e) for any other purpose(s) not specifically set forth in Section 2.1. Customer must submit an application that sets forth a true, accurate, and complete description of Customer's intended use case(s) for the Services (the “Use Case”), which complies with the Right to Use and Restrictions set forth above. [...] Customer agrees: (i) to not use the Service or Number Lookup Data for illegal purposes, (ii) not to interfere or disrupt networks connected to the Service, and, (iii) to comply with all applicable laws and regulations.

## Rate limit

- Per second: 10
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: projectId, number. Optional: features, rndFeatureOptions.contactDate
- Method: POST
- Path: /v2/projects/{projectId}/lookups

## About the plan

- Plan: Contact sales
- Who can get it: anyone with a Sinch Build Dashboard account and a use case Sinch approves, Canadian numbers also need a CLNPC license

## The 13 fields the plan's answer can hold

E.164 number, country code, line type, carrier, mobile country code, mobile network code, ported, ported date, SIM swapped, SIM swap period, VoIP probability, disconnected, trace ID

## Sinch's plans (1)

- [Sinch, contact us](https://datacircle.dev/validate-phone-apis/sinch/contact-us/llms.txt): 44% complete

## Sinch's calls (1)

- `POST /v2/projects/{projectId}/lookups`: [Sinch, contact us](https://datacircle.dev/validate-phone-apis/sinch/contact-us/llms.txt)

## Sinch's APIs (1)

- [Sinch: phone validation API pricing, 1 plan](https://datacircle.dev/validate-phone-apis/sinch/contact-us/llms.txt)

## Sinch: phone validation API alternatives

- [HLR Lookups, contact us, Postpaid account, POST /mnp-lookups](https://datacircle.dev/validate-phone-apis/hlr-lookups/contact-us-postpaid-account-post-mnp-lookups/llms.txt): 44% complete, live
- [CallerAPI, contact us, Enterprise transparency $40,000+, GET /api/network-lookup/{phone}](https://datacircle.dev/validate-phone-apis/callerapi/contact-us-enterprise-transparency-40000-get-api-network-lookup-phone/llms.txt): 44% complete, live
- [Addressfinder, contact us](https://datacircle.dev/validate-phone-apis/addressfinder/contact-us/llms.txt): 44% complete, live
- [Trestle, contact us, Enterprise, GET /2.0/real_contact, Real Contact API, full](https://datacircle.dev/validate-phone-apis/trestle/contact-us-enterprise-get-2-0-real-contact-real-contact-api-full/llms.txt): 44% complete, stored
- [iDenfy, contact us](https://datacircle.dev/validate-phone-apis/idenfy/contact-us/llms.txt): 44% complete

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-02.

- https://developers.sinch.com/_bundle/docs/number-lookup-api-v2/api-reference/number-lookup-v2.yaml?download&utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://developers.sinch.com/docs/number-lookup-api-v2/api-reference/errors?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://developers.sinch.com/docs/number-lookup-api-v2/api-reference/number-lookup-v2/numberlookupv2?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://developers.sinch.com/docs/number-lookup-api-v2/getting-started/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://developers.sinch.com/docs/number-lookup-api-v2/overview?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://developers.sinch.com/docs/number-lookup-api-v2/terms-and-conditions?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://sinch.com/phone-numbers/number-lookup-api/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing