--- title: "OTP Verification API for SMS & Voice | DIDWW" description: "Deliver fast, reliable one-time passwords globally with DIDWW OTP Verify. Built on direct routes with SMS & Voice, transparent per-OTP pricing, and a quick setup." canonical: "https://www.didww.com/otp-verify" last_updated: "2026-10-30T14:36:43.975Z" --- # OTP Verification API for SMS & Voice | DIDWW > Deliver fast, reliable one-time passwords globally with DIDWW OTP Verify. Built on direct routes with SMS & Voice, transparent per-OTP pricing, and a quick setup. Send and verify one-time passwords over SMS and Voice with monitored delivery, global coverage, and transparent pricing. [Try OTP Verify](https://my.didww.com/#/otp_verify_get_started) [Talk to an expert](https://www.didww.com/talk-to-an-expert) Messages now Your verification code is 482 913 Confirm your number Enter the code sent to +49 151 ••• •5678 4 8 2 9 1 3 Waiting for code Number verified POST /api/v1/verifications 201 "pending" Verification complete "status": "verified" ## 7,000+ businesses run mission-critical voice and SMS on DIDWW Limited time offer ## No verification fees until 2027! Pay only for SMS delivery and call minutes used until January 1, 2027. [Try OTP Verify](https://my.didww.com/#/otp_verify_get_started) ## Secure signups, logins and transactions with OTP Add an extra layer of protection to every account with simple OTP verification. DIDWW OTP Verify is a one-time password API for SMS and Voice, delivering codes across 70+ countries on DIDWW licensed carrier network. Verification activity Today Sign up +44 7••• ••• 102 Verified Log in +370 6•• •• 213 Verified Password reset +49 15• •••• 778 Code sent ### Protect accounts Secure login, signup, password reset and every other sensitive step. Node.js iOS Android REST // Start a verification const v = await otp.start({ phone: '+37061234567', channel: 'sms', }); // User enters the code await otp.check(v.id, code); status: verified ### Plug into your stack Use our REST API or ready-made SDKs for server and mobile. SMS · now Your code is 482 913 Verification call Reading code · 0:07 SMS · 73 countries Voice · 53 countries ### Reach users where they are Verify users via text or voice call across 70+ countries on monitored routes. ## Verify users by text or call ### SMS OTP Send one-time passwords directly to mobile phones by SMS. Reach users in 73 countries, with localized SMS templates available in 41 languages. Ideal for: - Signups - Logins - 2FA - Password resets - Transaction confirmations - Phone number verification ### Voice OTP Give users another way to receive a verification code with Voice OTP. One-time passwords are read aloud in an automated call in 53 countries and 49 languages. Ideal when: - SMS isn’t available - A user prefers a voice call - You’re verifying a landline - You need another delivery option [Try OTP Verify](https://my.didww.com/#/otp_verify_get_started) [Talk to an expert](https://www.didww.com/talk-to-an-expert) ## Pay only for verified OTPs Know how verification costs work before you get started. One verification API for SMS and Voice, with clear fees for verification and message delivery. - ### Pay when verification succeeds No verification fee for failed, expired or abandoned attempts. - ### See the fee upfront Every API response includes the quoted verification fee. - ### Pay delivery by destination SMS and voice delivery are billed separately for each destination. - ### Test for free Run test verifications straight from the DIDWW User Panel. [Try OTP Verify](https://my.didww.com/#/otp_verify_get_started) ### Sending at scale? Get volume pricing. Verifying users in high volumes? Talk to our team about pricing tailored to your traffic and target markets. [Talk to an expert](https://www.didww.com/talk-to-an-expert) ## Tools that put you in control Stay in charge of how verification runs, from setup to result. Every verification feels effortless for customers and is easy to manage for your team. Built-in tools give you control over delivery, integrations, messaging, and every step in between. ### Request callbacks Approve or reject each verification from your own backend before anything is sent. ### Automatic code capture Android fills in the code automatically, and iOS offers it as a one-tap suggestion. ### Custom messages Templates in 40+ languages, from English and Spanish to Chinese, fully customizable to match your brand. ### Flexible sender IDs Display your company name, or send OTPs using dedicated DIDWW numbers. ### Delivery insights Track and analyze delivery rates, latency, and conversion by channel and country. ### Integrate your way REST API and SDKs for Ruby, Python, Node.js, Android, iOS, React Native and Dart/Flutter. ## Carrier-grade infrastructure for global OTP verification OTP Verify runs on a network built for voice and messaging. As a licensed carrier, DIDWW combines its own numbering resources, direct carrier partnerships and network infrastructure with the tools your team needs to manage verification from start to finish. OTP Verify API 99.998% Core network uptime 7 PoPs Geo-redundant 7 PoPs Direct peering ### 99.998% core network uptime A private, geo-redundant network with 7 PoPs, direct peering and optimized routing. 30+ countries ### Licensed operator Fully licensed in 30+ countries, with own numbering resources and direct local carrier partnerships. Online ### 24/7 support Get help from DIDWW’s in-house support team, available 24/7/365 by email and live chat. "sms" "callout" ### SMS and Voice in one API Send codes by SMS or voice call from the same API, chosen per request. AI assistant ### AI-ready documentation Give your AI coding assistant access to our docs to help build your integration faster. Test → Production ### Self-serve from day one Create an application, test it, and move to production when you’re ready. ## Send. Deliver. Verify. No telecom set up required. Add phone verification to any flow with two API calls. Your application stays in charge and DIDWW handles delivery. ### 1 Create an OTP request Your application triggers an OTP request through the REST API or native SDK. ### 2 Deliver the verification code DIDWW dispatches the one-time password to the user via SMS or Voice call. ### 3 Verify the code The user enters the OTP, and the API checks the code against the active session. ### Continue the user journey Once verified, your app seamlessly proceeds with signup, login, or checkout. POST /api/v1/verifications Your server { "data" : { "destination" : " +4915112345678 ", "delivery_method" : " sms ", "sms" : { "languages" : [" en-US "] } } } 201 Created "status": "pending" ### Ready to integrate OTP Verify? Set up OTP verification with DIDWW. Test it, ship it, and verify customers worldwide. [Read docs](https://doc.didww.com/) [Try OTP Verify](https://my.didww.com/#/otp_verify_get_started) OTP Verify Sign up Log in Recovery Payment ## Secure every step of the user journey See how teams use DIDWW OTP Verify to protect logins, payments and account recovery. ### Phone number verification Confirm new users hold the phone number they register with, reducing bot signups, spam accounts and fake profiles. ### Secure logins & 2FA Add two-factor authentication to your login journey to protect user accounts from credential stuffing and unauthorized access. ### Password & account recovery Give users a secure, hassle-free way to verify ownership when resetting credentials or regaining account access. ### Payments & sensitive changes Confirm payments, payout changes and other sensitive account actions with a one-time code before they’re processed. ## Frequently Asked Questions ### What is OTP Verify? DIDWW OTP Verify is an OTP verification service that generates and delivers one-time passwords by SMS or automated Voice calls. Your application starts the verification and reports the code entered by the user through the Verification API. You can integrate through the REST API or supported SDKs and manage your OTP applications through the DIDWW User Panel. ### Which delivery methods does OTP Verify support? OTP Verify supports SMS and Voice call verification. You can send SMS passcodes in 73 countries and Voice passcodes in 53 countries, with localized SMS and Voice delivery available in multiple languages. ### Which programming languages and SDKs are supported? You can integrate through the REST API or use SDKs for Node.js, Ruby, Android, iOS, React Native, PHP, and Dart/Flutter. ### Can I test OTP Verify before going live? Yes. DIDWW provides a self-serve environment for testing your service flow before going live. Create an OTP application in the DIDWW User Panel, test your verification flow, and then create a separate production application when you're ready. ### Does OTP Verify support automatic SMS code capture? Yes, on Android. The Android SDK and React Native SDK detect the incoming verification SMS and fill in the code automatically on supported devices, with manual entry available as a fallback. On iOS, the system recognizes the code in the incoming SMS and suggests it above the keyboard, so users can fill it in with one tap. ### How is OTP Verify priced? Each verification returns a quoted verification fee. The verification fee is charged only when the verification reaches a verified status, while SMS and Voice delivery costs are billed separately. The exact fee is returned in the API response for each verification. ## Get access to OTP Verify in 70+ countries Create an account, set up your application, and set up your one-time password verification today. [Try OTP Verify](https://my.didww.com/#/otp_verify_get_started) [Talk to an expert](https://www.didww.com/talk-to-an-expert)