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Sinch Verification API

sinch.com

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Spec score 8.2 #2 of 24 in Phone Verification Software

What it 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, or other account checks through backend REST APIs and native Android and iOS SDKs. Verification methods include SMS, voice calls, flash calls, and data verification. Sinch describes multilingual service across devices and platforms, with fallback options for delivery, conversion, and price, supported by more than 600 direct tier-1 operator connections. Its Dashboard shows verification results and delivery and conversion metrics in real time. Named identity integrations include Okta and Auth0, while 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. For SDK requests from untrusted mobile devices, Sinch recommends Public Authentication and says verification callbacks should validate requests to help prevent fraud. The service has free access and trial credit through Sinch Build. Pay-as-you-go verification is billed per request; SMS pricing varies by country and operator, while flash calls have a fixed price per attempt.

Spec sheet

Purpose
The API provides scalable multi-factor authentication for app security and user verification.Read 7 Oct 2026 · sinch.com
Trial
Sinch Build offers free trial credit for testing Verification, including OTP, silent authentication, and number lookup.Read 7 Oct 2026 · sinch.com
Integrations
The product page names Okta and Auth0 as customer identity and access management integrations.Read 7 Oct 2026 · sinch.com
Security
Sinch says it is GDPR compliant, MEF Code of Conduct approved, and ISO 27001 certified.Read 7 Oct 2026 · sinch.com
Support
The product page provides regional phone support hours for the Americas, EMEA, Singapore, and Melbourne.Read 7 Oct 2026 · sinch.com
Headquarters
Stockholm, SwedenRead 28 Sep 2026 · sinch.com
Founded
2008Read 28 Sep 2026 · sinch.com
Additional integrations
The developer documentation lists integration guides for Auth0, ForgeRock, Okta, and SAP.Read 7 Oct 2026 · developers.sinch.com
Authentication use cases
Sinch describes the API as supporting multi-factor authentication and password-free phone number verification.Read 7 Oct 2026 · sinch.com
Company history
Sinch says its founders set out to transform customer communications in 2008.Read 7 Oct 2026 · sinch.com
Data Verification availability
Sinch says Data Verification requires mobile data to be enabled and advises contacting an account manager to use it.Read 7 Oct 2026 · developers.sinch.com
Developer access
The Verification SDK is available for iOS and Android, and backend services are exposed through REST APIs.Read 7 Oct 2026 · developers.sinch.com
Free access
Sinch's SMS Verification page instructs users to sign up for a free account to send a verification request.Read 7 Oct 2026 · sinch.com
Global reach
The service supports verification on any device or platform, in multiple languages, with fallback options for delivery, conversion, and price.Read 7 Oct 2026 · sinch.com
Integration
Sinch lists Okta and Auth0 as customer identity and access management integrations.Read 7 Oct 2026 · sinch.com
Integration requirement
The Auth0 integration guide requires a Sinch account with enough credits and the user's phone number in metadata under phone_number.Read 7 Oct 2026 · developers.sinch.com
Intended uses
Sinch describes Data Verification use cases including banking, e-commerce, and social apps.Read 7 Oct 2026 · sinch.com
Mobile SDKs
Sinch provides native SDKs for building verification into Android and iOS apps.Read 7 Oct 2026 · developers.sinch.com
Network
Sinch says its global network has more than 600 direct tier-1 operator connections.Read 7 Oct 2026 · sinch.com
Pricing
The pricing page describes pay-as-you-go SMS pricing but does not state a Verification API price.Read 7 Oct 2026 · sinch.com
Pricing model
Verification is priced per request; SMS price depends on country and operator, and flash calls have a fixed price per attempt.Read 7 Oct 2026 · developers.sinch.com
Request protection
For SDK requests from untrusted mobile devices, Sinch recommends Public Authentication and requires verification callbacks to validate requests and help prevent fraud.Read 7 Oct 2026 · developers.sinch.com
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.Read 7 Oct 2026 · trust.sinch.com
Usage insights
The Sinch Dashboard displays verification results and delivery and conversion metrics in real time.Read 7 Oct 2026 · developers.sinch.com
Use cases
Sinch describes OTPs, password-free phone number verification, and one-factor authentication for sign-up, login, and password resets.Read 7 Oct 2026 · sinch.com
Verification methods
The product page lists Flash Call, SMS, Data Verification, and Phone Call verification.Read 7 Oct 2026 · sinch.com

Plans and prices

Pay-as-you-go verification Priced on request 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 Read 7 Oct 2026 · developers.sinch.com

Every Sinch Verification API plan and price →

Strong points and limits

Strong points

  • Offers SMS, voice, flash-call, and data verification.
  • Provides Android and iOS SDKs plus REST APIs.
  • Dashboard shows delivery and conversion metrics.
  • Free access and trial credit are available.
  • Lists Okta and Auth0 integrations.

Limits

  • No specific verification price is stated.
  • SMS costs vary by country and operator.
  • Data Verification requires mobile data enabled.
  • Data Verification use requires contacting an account manager.

Who it suits

It suits developers adding phone verification or multi-factor authentication to account flows on mobile, web, or API-based services. The listed banking, e-commerce, and social-app use cases for Data Verification may also be relevant where mobile data is enabled.

Verdict

Sinch offers several verification methods and developer access paths, with usage-based charges rather than a stated fixed API price. Check method availability and request-protection guidance when planning an implementation.

Where Specifiction places it

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