20,000 Companies Already Sending via Mobile Text Alerts
Stay Safe. Stay Compliant. Stay Connected.
Texting for business comes with rules, and we’ve built compliance into the platform so you never have to think about it.
Automatic opt-in/opt-out management
TCPA, FCC & carrier compliance guardrails
Audit trails for message history
Why Use The Mobile Text Alerts SMS 2FA API?
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SMS 2FA API
A Two Factor Authentication API Built Around Two Endpoints.
Mobile Text Alerts' SMS 2FA API handles code generation, delivery, and validation in two API calls.
No credit card required. Free API Key in seconds.
Your application sends a POST request with the user's phone number and your service name. Mobile Text Alerts generates the OTP, delivers it by SMS, and returns a verificationId to use in the next step.
Call /send-code with a phone number.
From API Call To Verified User In Three Steps
The Mobile Text Alerts 2FA SMS API is built around two endpoints. Send a code, then check it.
Your user receives the code and enters it.
If the phone number is valid, the user receives the OTP by SMS and enters it into your application. Your application then passes the user-supplied code to Mobile Text Alerts for validation.
Call /check-code and act on the result.
Pass the verificationId and user-supplied code to /check-code. Mobile Text Alerts returns APPROVED, EXPIRED, or INVALID. Your application reads the status and grants or denies access.
Two endpoints. No per-verification fees. Human support from day one.
Start Building With the SMS 2FA API.
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Everything The SMS 2FA API Needs To Handle. Already Handled.
Number Validation and Risk Detection
Use the realtime parameter to validate a phone number before sending a code. Set bypass: true to receive a risk field in the response identifying issues like VoIP, landline, or deny-listed numbers. Your application decides how to act on the result.
Configurable Code Settings
Set code length from 4 to 8 digits and control expiry with timeoutSeconds. The OTP message includes your service name so users know exactly which app it came from.
Idempotent Requests
Include an X-Request-ID header on any /send-code call. If a network failure leaves the request state unclear, resend the same ID and the API returns a 409 Conflict instead of sending a duplicate code.
Built-in Fraud Risk Detection
Set bypass: true in your /send-code request and the response includes a risk field. It identifies VoIP, suspended, deactivated, and deny-listed numbers so your application can decide whether to proceed.
Webhook Delivery Events
Webhook events fire on message-send and delivery-status using the messageId returned from /send-code. Track every OTP delivery in your own systems without polling.
Human Support When You're Integrating
Mobile Text Alerts support is US-based humans, not a ticket queue. Get help with API setup, edge cases, and carrier troubleshooting by chat or email.
Code generation, delivery, validation, fraud screening, and idempotency are built into the API. You write the logic that matters for your product.
Where Teams Are Using SMS Two Factor Authentication Today.
Login Verification
Add a second factor to any login flow. After the user enters a password, trigger a /send-code call and require the OTP before granting session access.
Account Registration
Verify a real phone number at signup before creating the account. Block fake registrations and reduce fraud at the top of your funnel.
High-Value Transaction Confirmation
Require re-verification before processing payments, wire transfers, or account setting changes. Add a friction layer exactly where it protects revenue.
Password Reset Confirmation
Replace email-only password reset flows with SMS 2FA. Verify the user owns the account's phone number before allowing any credential change.
Employee Access and Admin Actions
Gate sensitive admin panels, payroll access, or configuration changes behind SMS 2FA, even for internal teams with existing SSO.
Periodic Session Re-Verification
Re-verify users after periods of inactivity or when accessing sensitive data. Keep sessions tight without forcing a full re-login.
From login flows to account recovery, the SMS 2FA API fits into any workflow that needs verified phone access.
Three jobs done with two API calls.
Code generation, delivery, and validation in two endpoints.
Generates a one-time verification code per authentication request
Delivers the code by SMS to the user's registered phone
Validates the code the user supplies against the original
Returns a status your application uses to grant or deny access
What a stolen password can't do.
SMS 2FA puts a second lock between an attacker and your users' accounts.
Complete login without access to the user's registered phone
Reuse a code after it expires
Use a fake or invalid phone number without being flagged
Trigger duplicate codes during a failed network request
“I love how easy it is for people to opt in and how fast I can send a text alert out. Mobile Text Alerts helped me give my customers an immediate message that I know they'll see faster than an email (if they even check their email). It helped me connect with them and offer deals to help me generate income quickly.”
- Camille
“I love using Mobile Text Alerts because it creates efficiencies for my business. I can create vast amounts of clients and have people opt in and communicate in a way that’s really impossible to do any other way. … I’ve seen sales go up exponentially. … I would definitely recommend it to a friend.”
– Frank
“I like the fact that you can reach so many people at one time. The fact is, 9 times out of 10, people will check their text messages before they read their emails. Also, I love the fact that any unused messages just roll over into the next month.”
– Wanda
Why 20,000 Organizations Choose Mobile Text Alerts