OnlineSim alternative
OnlineSim is one of the older marketplaces, with activations, rentals and an API. SMS Nitro offers the same product types with clearer billing and live success data.
Why switch from OnlineSim?
If you want to see the success rate of a country before buying, pay only when the SMS arrives, and keep your tooling through an SMS-Activate-compatible API. If OnlineSim works for your apps, keep it and use SMS Nitro as a fallback.
What OnlineSim is
One of the older marketplaces, operating since 2013: one-time activations, rentals from one to 30 days that can be extended, and a documented API.
What SMS Nitro does differently
- Private numbers only, never shared inboxes.
- Price frozen at purchase, charged only when the SMS arrives; the number is reserved for 20 minutes.
- Live price and recent success rate per app and country before you confirm.
- Card and crypto top-ups from $5, balance that never expires, no subscription.
- REST API plus an SMS-Activate-compatible endpoint, so existing tools migrate by changing the key.
- Catalog written in each language from scratch, with a legal entity, refund policy and support behind it.
Moving from OnlineSim to SMS Nitro
Create an account, top up from $5 and compare the prices of the apps you use most. If you used OnlineSim through its API, the SMS-Activate-compatible endpoint lets most scripts run unchanged after you swap the base URL and the key. Numbers that receive no SMS are never charged, so testing a new provider costs nothing when it fails.
SMS Nitro at a glance
| Billing | Pay only if the code arrives. If no SMS arrives before the number expires, the frozen amount returns to your balance automatically, in full. |
|---|---|
| Number reserved for | Up to 20 minutes per activation. Rentals from 24 hours to 30 days with unlimited incoming SMS. |
| Payment | Card via Stripe (Visa, Mastercard, Amex, Apple Pay, Google Pay) or crypto (USDC or SOL on Solana). Minimum top-up $5. Card top-ups carry a 10% processing fee; crypto has none. |
| Subscription | None. Pay per verification; your balance never expires. |
| Countries | 180+ countries, including the United States, the United Kingdom, Canada, India, Germany, Brazil, Indonesia and the Philippines. |
| Apps | 700+ apps and websites: WhatsApp, Telegram, Google, Instagram, TikTok, Discord, OpenAI, PayPal, Tinder, Amazon and more. |
| Developers | REST API plus an SMS-Activate-compatible endpoint. API key available after your first top-up. No API surcharge. |
| Support | Tickets from the dashboard and email, answered by people. |
| Price | From $0.02 per verification code, depending on the app and the country. |
Frequently asked questions
Does SMS Nitro offer long rentals?
Up to 30 days per period, extendable before expiry.