OTP Activation: One-Time Numbers for Verification Codes
By Inbox Number Team · Published · Last updated · 2 min read
OTP activation is a one-time number used to receive a single verification code for a specific service. On Inbox Number you choose the service and country and use the number shown. If no code arrives within the order window, you cancel and the price goes back to your balance. The OTP marketplace is coming soon; join the waitlist.
Availability: monthly numbers (US, CA, UK, AU) can be ordered now. The OTP marketplace (one-time activations and short-term US rentals), eSIM data plans and proxies are coming soon; you can join their waitlists on the product pages.
When you need just one code, a monthly number is more than you need. The OTP marketplace, coming soon, will offer short, one-time numbers priced per service. This page explains how it works; the full product page is OTP and SMS verification.
How does OTP activation work?
You pick a service and country, get a temporary number, enter it in the service, and the code appears in your dashboard. The order then completes.
- Sign in and top up your wallet with crypto.
- Search for the service you're verifying.
- Choose a country from those offered for that service.
- Enter the number shown, and wait for the code.
- Copy the code. If none arrives within the window shown on the order, cancel for a balance refund.
What does OTP activation cost?
Each service has its own price, shown before you buy. You pay from your wallet balance. Unused orders, where no code arrives, are refunded to your balance.
See pricing for monthly numbers and the marketplace for per-service prices.
How long does a one-time number last?
Long enough to receive one code: each order shows its own time window. For repeat codes over hours or days, choose a short-term US rental, and for anything longer, a monthly number.
| Option | Duration | Best for |
|---|---|---|
| One-time activation | One code | A single sign-up |
| Short-term US rental | Hours to days | A few codes in a short period |
| Monthly number | While you renew | Accounts you'll log in to again |
Compare in detail at number types.
Which services are covered?
The marketplace lists popular apps and websites, searchable by name. See services for notes on specific platforms, including restrictions and honest compatibility notes.
What are the rules?
Only verify accounts you own, follow each service's terms, and don't use one-time numbers for bulk or automated sign-ups. Don't use them for accounts you'll need to recover later.
Frequently asked questions
Is OTP activation available to everyone?
Not yet. The OTP marketplace is coming soon; join the waitlist on the OTP marketplace page.
What if the code never arrives?
Cancel the order and the price returns to your balance. See OTP not received.
Can I receive a second code?
A one-time number is for one code. Use a short-term rental for more.
Are codes private?
Yes. Codes appear only in your dashboard.
Can I pay with crypto?
Yes, by topping up your wallet. See buy a virtual number with crypto.
Related articles
Pillar guide
The Complete Guide to OTP Verification and SMS Authentication
What OTP verification is, how SMS one-time passcodes work, how secure they are, and how to receive OTP codes on a virtual number responsibly.
October 26, 2026 · 5 min read
Blog
Temporary vs. Permanent Virtual Phone Numbers
Temporary vs permanent virtual numbers: one-time numbers, short-term rentals and monthly numbers compared, with a simple way to pick the right one.
October 26, 2026 · 4 min read
Guides
Why Is My SMS Verification Code Not Arriving? (OTP Not Received)
OTP not received? Work through 10 checks for missing SMS verification codes, from number format and resend limits to blocked number types.
October 26, 2026 · 4 min read
Blog
How to Buy a Virtual Number with Crypto
Step-by-step: buy a virtual number with crypto by topping up an Inbox Number wallet, then pay for a monthly or one-time number. Tips and caveats included.
October 26, 2026 · 3 min read
Only need one verification code?
The Inbox Number OTP marketplace (coming soon) will offer one-time activations for a single code, with a balance refund if no code arrives. Ordering isn't open yet; monthly numbers are available now.