SMS Verification Endpoints Explained for Developers
Understanding SMS verification endpoints is the fastest way to build a reliable integration. Most virtual-number APIs expose the same handful of actions, even when the names differ: check balance, list services, order a number, read status, finish and cancel. This guide explains what each endpoint does, the data you send and receive, and the mistakes that cost developers money.
What Are SMS Verification Endpoints?
SMS verification endpoints are the URLs of an API that let your software request a virtual number, read the SMS it receives and close the order. They turn a manual dashboard process into repeatable code. The exact paths and parameters are listed in the OtpGet documentation.
The Core Endpoints You Will Meet
| Action | Purpose | Typical inputs |
|---|---|---|
| Get balance | Check available funds | API key |
| List services and countries | See what can be ordered | API key |
| Order number | Reserve a virtual number | Service, country |
| Get status | Check whether the SMS arrived | Order id |
| Finish order | Confirm success | Order id |
| Cancel order | Release and refund | Order id |
Names and parameters vary, so treat this as a map of concepts, not a specification.
Authentication
Every request must identify you, usually with an API key sent as a header or parameter. Keep that key secret. Store it in an environment variable, never in browser code or a public repository, and rotate it if you think it leaked. If your integration runs in several places, give each its own key where the provider allows it, so you can revoke one without breaking the rest.
Checking Balance
A balance endpoint returns your available funds. Call it at the start of a run to avoid failing halfway, and before large batches. Compare the balance against the estimated cost of the run and stop early with a clear message if funds are short. This simple check prevents half-finished test runs.
Listing Services and Countries
Catalogue endpoints return the apps and countries you can order, often with price and stock. Use them to build your selection logic instead of hard-coding values, because availability changes. A good pattern is to fetch the list at the start of a run, filter by your approved countries and choose the cheapest one with healthy stock.
Ordering a Number
The order endpoint reserves a number for a service and country. A successful response normally returns an order id and the phone number. Save the id immediately, because every later call depends on it. If the response says no numbers are available, do not retry instantly in a loop. Try another country or wait a short, increasing delay.
- Send the order request with service and country.
- Read the order id and number from the response.
- Store both in your test or job record.
- Pass the number to the app under test and trigger the code.
Polling for the SMS
The status endpoint tells you whether the SMS has arrived and, if so, returns its text or code. Poll every few seconds, not constantly, and stop after a fixed maximum wait. Typical states include waiting, received and cancelled. Handle each explicitly so your code never hangs on an unexpected value.
- Waiting: sleep and try again.
- Received: extract the code and continue.
- Cancelled or expired: stop and report the failure.
Finishing and Cancelling
Close every order. If the code arrived and you used it, finish the order. If it did not arrive, cancel it so the balance is returned according to the provider's rules. Leaving orders open can tie up funds and, on some platforms, count against limits. Make cancellation part of a cleanup block that runs even when your code throws an error.
Reading the Code From the Message
Do not depend on exact wording. Search the message for a sequence of digits of the expected length, for example four to eight, and confirm that only one candidate exists. If the message contains several numbers, such as an amount and a code, apply additional logic, such as looking for words that usually precede a code.
Error Handling Patterns
| Error type | Recommended response |
|---|---|
| Bad key | Stop and alert the owner |
| Low balance | Stop the run and notify |
| No stock | Switch country or back off |
| Rate limit | Wait and retry with delay |
| Timeout | Cancel the order and log |
Log every error with the order id and a timestamp so you can reproduce problems later.
Security and Responsible Use
Use these endpoints only for products you own or are authorised to test, and for lawful privacy needs. Do not use them to create spam accounts or defeat a platform's protections. To get access, create an OtpGet account and generate a key.
Designing a Small Client Library
Instead of scattering raw HTTP calls through your code, wrap the endpoints in a small client with one method per action. Give it a single place to attach the key, set timeouts and translate error responses into clear exceptions. This keeps the rest of your code readable and makes it easy to swap the provider or update a parameter without hunting through many files. Add a method that performs the entire order, wait and cleanup cycle so that test authors do not repeat the same sequence.
Idempotency and Duplicate Orders
An order request costs money, so guard against duplicates. If a request times out, check recent orders before sending it again. Save your own correlation id with each job so you can match it to the provider's order id. This prevents the quiet failure where a retry silently buys a second number.
Testing Your Own Integration
- Run a test with a number that never receives a code to prove your timeout and cancel logic works.
- Run a test with a very low balance to confirm your code stops cleanly.
- Simulate a rate-limit response and make sure your back-off behaves.
- Check that a crash in the middle of a job still triggers cleanup.
Planning for the Long Term
Think about how long you will need the account before you decide how to handle sms verification endpoints. A short test needs very little planning, while an account you intend to keep needs recovery options that do not depend on a temporary line. Add a recovery email you control, save backup codes offline and note any renewal dates in a calendar. If the account becomes important, move it to a number you own. A few minutes of planning at the start can save hours of recovery work later.
Frequently Asked Questions
What endpoints does an SMS verification API have?
Typically balance, service and country lists, order number, status, finish and cancel. Exact names and parameters are in the provider's documentation.
How often should I poll for the SMS?
Every few seconds is usually enough. Add a maximum wait and stop polling when it passes, to avoid rate limits.
What happens if I forget to cancel an order?
The order may stay open until it expires and can tie up your funds. Always cancel or finish orders in a cleanup step.
Can I call the API from a browser?
Avoid it. Calling from client-side code exposes your key. Make requests from your server instead.
Do I need a SIM to use these endpoints?
No. You receive SMS without a SIM because the message is returned through the API.
Conclusion
SMS verification endpoints follow a simple lifecycle: authenticate, check balance, order, poll, then finish or cancel. Guard your key, handle errors and always close orders. When you are ready to build, read the API documentation and open your OtpGet account.
Related reading: more API guides on the OtpGet blog.