High-speed SMS/OTP testing automation via API without the need for a real SIM.

Tnsms.site is a SaaS platform that provides virtual phone number services supporting automatic OTP code reception through API and Web interface, part of the tools for software development support (Developer Tools & QA Testing). The service helps developers and businesses optimize the SMS authentication feature testing process during application development.

When developing applications with SMS registration or login features, automated testing is often hindered by a lack of test SIMs, the high cost of hardware maintenance, or high message latency causing test cases to fail. Tnsms.site solves this problem by providing real-time OTP reception infrastructure via API, allowing developers to accurately simulate user flows and test system stability without needing physical SIMs.

Typical use cases:

• Automating registration/login test cases: Directly integrate the API into automated test scenarios using Selenium, Puppeteer, or Cypress to verify the entire flow of receiving and validating OTP codes when registering a new account.
• Testing the 2FA security verification flow: Use test phone numbers to test two-factor authentication (2FA) features for banking applications, digital wallets, or internal SaaS systems, ensuring that balance change messages/verification codes are processed correctly.

Core features of the system:

• Optimized RESTful API infrastructure: Provides high-speed API connectivity, supporting automatic OTP reception, easily integrated into testing frameworks like Selenium, Cypress, Puppeteer, or Postman.
• Diverse testing number system: Offers a repository of test numbers ready to receive messages 24/7, effectively meeting large-scale testing scenarios.
• Automatic Refund mechanism: The service only charges fees when the test OTP code is successfully returned. If no message is received within the timeout period, the system will automatically refund the fee.
• Real-time monitoring dashboard: An intuitive interface to monitor API call status, received SMS message logs, and manage balance flexibly.

Rapid integration via API (Standard example from Tnsms API Docs):

Example of renting a test phone number using cURL:

Bash

curl -X POST "https://tnsms.site/api/services/rent?service_id=1&category=11" \
     -H "Authorization: Bearer YOUR_API_TOKEN"

Example of polling for OTP using Python:

Python

import requests

headers = {"Authorization": "Bearer YOUR_API_TOKEN"}

# 1. Call API to rent a number
rent_res = requests.post("https://tnsms.site/api/services/rent?service_id=1&category=11", headers=headers).json()

if rent_res.get("success"):
    rental_id = rent_res["data"]["rental_id"]
    phone_number = rent_res["data"]["phone_number"]
    print(f"Test phone number: {phone_number}")

    # 2. Poll for OTP using rental_id
    check_res = requests.get(f"https://tnsms.site/api/services/check?rental_id={rental_id}", headers=headers).json()
    print(check_res)

The product is specifically designed for Software Quality Assurance (QA/QC Engineers), Developers, Product Teams needing a Sandbox environment to test SMS flows, and businesses wanting to check the stability of their internal OTP sending systems.

Quick start guide & Demo documentation:

• API Documentation & Video Demo: View detailed API integration documentation at: [https://tnsms.site/docs](https://tnsms.site/docs)
• Supported platforms: Operates directly on Web browsers (Chrome, Edge, Firefox) and is fully compatible with all programming environments (Python, C#, Node.js, Java) via API.

• Steps to use:

  1. Visit tnsms.site and create an account using your email.
  2. Initialize test balance on the management interface.
  3. Call API /api/services/rent to receive rental_id and phone number.
  4. Input