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Sinch Verification API
What Sinch Verification API is
Sinch Verification API provides multi-factor authentication and phone-number verification for app sign-up, login and password resets. Developers can use one-time passwords, password-free verification and one-factor checks through SMS, voice calls, flash calls or data verification. Access is available through REST APIs and native SDKs for Android and iOS, with support for web and API use. Sinch describes multilingual verification across devices and platforms, with fallback options for delivery, conversion and price; its network has more than 600 direct tier-1 operator connections. The Dashboard displays verification outcomes and delivery and conversion metrics in real time. Named identity integrations include Okta and Auth0, and developer guides also cover ForgeRock and SAP. Data Verification requires mobile data to be enabled, and Sinch advises contacting an account manager to use it. A free plan and free trial credit through Sinch Build are listed. Verification is also offered pay-as-you-go per request, but no API price is stated; SMS prices vary by country and operator, while flash calls have a fixed price per attempt.
Who it suits
It suits developers adding phone-based verification or multi-factor authentication to account flows across mobile, web or API services. Teams using the Android or iOS SDKs should also account for the stated request-protection guidance.
What it does well
- SMS, voice, flash call and data verification
- Native Android and iOS SDKs
- Dashboard shows delivery and conversion metrics
- Free trial credit available
What to know first
- Data Verification requires mobile data enabled
- SMS pricing varies by country and operator
Limits
Pay-as-you-go verification is billed per request. SMS pricing varies by country and operator, and flash calls have a fixed price per attempt; Data Verification requires mobile data to be enabled.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Pay-as-you-go verification | Per request; SMS pricing varies by country and operator, and flash calls have a fixed price per attempt. · Current pricing list available in the Sinch Build dashboard | On request |
As sinch.com lists them, read 7 Oct 2026. The maker's own page has the final word.
Getting started
- Visit the Sinch Verification API website.
- Create a Sinch account to access free account verification requests.
- Use Sinch Build trial credit to test OTP, silent authentication, or number lookup.
- Choose a REST API for backend services or a native Android or iOS SDK.
- For Auth0, provide enough Sinch account credits and put the user's phone number in metadata under phone_number.
- Configure verification callbacks to validate requests from untrusted mobile devices.
Verdict
Sinch Verification API offers several phone-based verification methods and developer access through REST and mobile SDKs.
Questions
Is Sinch Verification API free?
Sinch lists a free plan and offers free trial credit through Sinch Build. Verification is also available on a paid, pay-as-you-go basis.
How is verification priced?
Pay-as-you-go verification is billed per request. SMS prices vary by country and operator, while flash calls have a fixed price per attempt.
Which verification methods does it support?
Methods include SMS, voice calls, flash calls, and data verification. Data Verification requires mobile data to be enabled.
Which platforms and developer interfaces are supported?
The service supports Android, iOS, web, and API use. Backend services use REST APIs, and native SDKs are available for Android and iOS.
Which identity integrations are named?
Sinch names Okta and Auth0 as identity and access management integrations. Developer documentation also includes guides for ForgeRock and SAP.
What security credentials does Sinch list?
Sinch says it is GDPR compliant, MEF Code of Conduct approved, and ISO 27001 certified. Its Trust Center lists ISO 27001:2022, SOC 2 Type II, PCI, GDPR, and HIPAA badges, noting certifications may apply to specific products.
Facts from Sinch Verification API's own pages
- Additional integrations
- The developer documentation lists integration guides for Auth0, ForgeRock, Okta, and SAP. · developers.sinch.com, 7 Oct 2026
- Authentication use cases
- Sinch describes the API as supporting multi-factor authentication and password-free phone number verification. · sinch.com, 7 Oct 2026
- Company history
- Sinch says its founders set out to transform customer communications in 2008. · sinch.com, 7 Oct 2026
- Data Verification availability
- Sinch says Data Verification requires mobile data to be enabled and advises contacting an account manager to use it. · developers.sinch.com, 7 Oct 2026
- Developer access
- The Verification SDK is available for iOS and Android, and backend services are exposed through REST APIs. · developers.sinch.com, 7 Oct 2026
- Founded
- 2008 · sinch.com, 28 Sept 2026
- Free access
- Sinch's SMS Verification page instructs users to sign up for a free account to send a verification request. · sinch.com, 7 Oct 2026
- Global reach
- The service supports verification on any device or platform, in multiple languages, with fallback options for delivery, conversion, and price. · sinch.com, 7 Oct 2026
- Headquarters
- Stockholm, Sweden · sinch.com, 28 Sept 2026
- Integration
- Sinch lists Okta and Auth0 as customer identity and access management integrations. · sinch.com, 7 Oct 2026
- Integration requirement
- The Auth0 integration guide requires a Sinch account with enough credits and the user's phone number in metadata under phone_number. · developers.sinch.com, 7 Oct 2026
- Integrations
- The product page names Okta and Auth0 as customer identity and access management integrations. · sinch.com, 7 Oct 2026
- Intended uses
- Sinch describes Data Verification use cases including banking, e-commerce, and social apps. · sinch.com, 7 Oct 2026
- Mobile SDKs
- Sinch provides native SDKs for building verification into Android and iOS apps. · developers.sinch.com, 7 Oct 2026
- Network
- Sinch says its global network has more than 600 direct tier-1 operator connections. · sinch.com, 7 Oct 2026
- Pricing
- The pricing page describes pay-as-you-go SMS pricing but does not state a Verification API price. · sinch.com, 7 Oct 2026
- Pricing model
- Verification is priced per request; SMS price depends on country and operator, and flash calls have a fixed price per attempt. · developers.sinch.com, 7 Oct 2026
- Purpose
- The API provides scalable multi-factor authentication for app security and user verification. · sinch.com, 7 Oct 2026
- Request protection
- For SDK requests from untrusted mobile devices, Sinch recommends Public Authentication and requires verification callbacks to validate requests and help prevent fraud. · developers.sinch.com, 7 Oct 2026
- Security
- Sinch says it is GDPR compliant, MEF Code of Conduct approved, and ISO 27001 certified. · sinch.com, 7 Oct 2026
- Support
- The product page provides regional phone support hours for the Americas, EMEA, Singapore, and Melbourne. · sinch.com, 7 Oct 2026
- Trial
- Sinch Build offers free trial credit for testing Verification, including OTP, silent authentication, and number lookup. · sinch.com, 7 Oct 2026
- Trust documentation
- Sinch's Trust Center lists ISO 27001:2022, SOC 2 Type II, PCI, GDPR, and HIPAA badges and says certifications may apply to specific products. · trust.sinch.com, 7 Oct 2026
- Usage insights
- The Sinch Dashboard displays verification results and delivery and conversion metrics in real time. · developers.sinch.com, 7 Oct 2026
Where Sinch Verification API stands on Freedom251
- Transactional SMS Software#7 of 76
- Phone Verification Software#3 of 24
- Multi-Factor Authentication APIs#11 of 25