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VirtualSMS.io
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VirtualSMS is a developer-first SMS verification API that uses real SIM-backed phone numbers, not VoIP. Receive OTP codes for any service that sends SMS — built for signup testing, account verification, 2FA flows, and autonomous AI agent workflows.
/stubs/handler_api.php — migrate by changing only the base URLcomposer require virtualsms/sdk; npm via npx -y virtualsms-mcpFree API key, instant, no credit card. Sign up at virtualsms.io.
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VirtualSMS.io's answer:
VirtualSMS uses real SIM-backed phone numbers, not VoIP — so it works with services that reject VoIP (WhatsApp Business, Telegram bot at scale, banking apps, dating platforms). It's also the only SMS verification API that ships with an MCP server for AI agents and x402 stablecoin payment support — making it the first SMS API designed for both developers and autonomous AI agents.
VirtualSMS.io's answer:
Three reasons:
Real SIM numbers work where VoIP fails. Most competitors (5SIM, SMS-Activate, SMSPVA) lean heavily on VoIP. That gets blocked by services that matter — WhatsApp Business, banking apps, dating platforms. Our numbers don't.
Built-in MCP server for AI agents. Claude, Cursor, ChatGPT, and any MCP-compatible AI agent can handle phone verification autonomously through our MCP server. No other SMS API in this category ships with this.
Pay-per-use, no contracts, no minimum deposit. From $0.05/code. Free API key. Public price endpoint lets you check pricing before signing up. Auto-refund on failed deliveries. x402 stablecoin payments for international developers who want to skip KYC.
VirtualSMS.io's answer:
Developers building OTP-dependent workflows: signup testing, QA automation, account verification at scale, and onboarding flows.
Growing segment: AI agent builders using MCP-compatible tools (Claude Code, Cursor, ChatGPT) that need autonomous phone verification capability.
Also: teams migrating from legacy SMS verification providers that no longer meet their needs — either because their suppliers shut down or because their numbers are now blocked as VoIP.
VirtualSMS.io's answer:
VirtualSMS launched because every SMS verification API on the market was either VoIP-only — rejected by WhatsApp, banking apps, and most major services — or built around legacy plain-text protocols that modern AI agents couldn't use natively.
We started with a modern REST API and real-SIM-backed numbers. We added an MCP server from day one, making us the first SMS verification service designed for both developers and autonomous AI agents. x402 stablecoin payment support followed — removing KYC friction for international developers who'd been priced out of legacy providers.
VirtualSMS.io's answer:
REST API over HTTPS with OpenAPI 3.1 specification
TypeScript MCP server (Model Context Protocol)
Mintlify-hosted developer documentation
x402 stablecoin payment protocol on Base / Polygon / Arbitrum / Optimism
WebSocket for real-time SMS delivery notifications
Webhook event notifications for async integration
sms-activate-style legacy compatibility endpoint (/stubs/handler_api.php) for drop-in migration
VirtualSMS.io's answer:
-AI agent platforms integrating our MCP server for autonomous phone verification
-E-commerce QA automation teams testing signup and checkout flows
-Crypto-native developer projects using x402 stablecoin payments
-Developers migrating from sms-activate-style legacy providers
As a writer, I've been using Basecamp for a few years now and I must say, it has been a game-changer for me. Basecamp is a cloud-based project management tool that offers a suite of features to help teams collaborate efficiently and effectively.
I started using Basecamp as a project management tool to manage my writing projects. Initially, I found it a bit overwhelming, but with time I got used to the interface and the features. Basecamp has a clean and intuitive design that makes it easy to use. The dashboard is well-organized and shows all the active projects and tasks at a glance. Basecamp has a variety of features that make it easy to manage tasks, track progress, communicate with team members, and share files.
Based on our record, Basecamp seems to be more popular. It has been mentiond 40 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
One implementation note that cost me a wrong result: URL predicates need tighter clause boundaries than entity mentions do. Split on sentence punctuation only, and "并没有推出中文官网，其主要官网是 https://basecamp.com" flags that URL as negated — but the negation targets the Chinese site and the URL is being affirmed, one comma later. Splitting on commas as well fixed it: zero false flags across 1,416 URLs, and 74 genuine... - Source: dev.to / about 1 month ago
Products like Fullstory (analytics), Intercom (live chat), Basecamp (project management), and Shopify (eCommerce) were created based on internal tools. - Source: dev.to / 5 months ago
37 Signals [0] famously uses their own Stimulus [1] framework on most of their products. Their CEO is a proponent of the whole no-build approach because of the additional complexity it adds, and because it makes it difficult for people to pop your code and learn from it. [0]: https://basecamp.com/. - Source: Hacker News / 11 months ago
Remote work is an established term these days, but back in the days i.e. Prior to COVID or a few more years back, this term was quite alien in the developer community. Even though there were organizations like Basecamp which were working remotely for more than 20 years, the developer ecosystem was not built around the concept of working remotely or to put it in simple words, separately from your colleagues. Just... - Source: dev.to / almost 3 years ago
It's interesting, I've sampled basecamp.com and the number was 35 too, very similar variables, taking into consideration Basecamp is Older than Hey and heavily flex-box oriented. Source: about 3 years ago
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
Grizzly SMS - Grizzly SMS offers to get temporary phone numbers for OTP from any popular service. Here you can get a virtual mobile number for SMS verification of any country in the world. ✅ Legal service. ✅ Best price
Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.
SMSCode.gg - Buy virtual numbers to receive SMS online for OTP verification. Temporary phone numbers with real SIM, fast activation, 100+ countries. A reliable sms-activate alternative.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
SMS-Activate.guru - SMS-Activate is a service for sale and rent of virtual numbers of more than 180 countries. We provide virtual numbers in most countries of the world so that you can use them to receive an SMS with a confirmation code online.