LicenseGuard – License Key Verification & Activation API
LicenseGuard is a production-ready software licensing backend for developers who need secure license key validation, activation enforcement, and refund-based revocation without building custom infrastructure.
This API allows you to:
Validate license keys securely
Enforce per-device activation limits
Prevent key sharing
Automatically revoke access after refunds or cancellations
Track activation status in real time
Send a POST request to the /validate endpoint with:
licenseKey
deviceId
The API verifies the license, checks activation limits, and returns a clear validation response indicating whether the license is valid.
A lightweight /health endpoint is included for monitoring and uptime checks.
Indie developers selling downloadable software
SaaS tools distributed outside app stores
Game developers selling direct licenses
Plugin and theme creators
AI tool builders distributing desktop applications
{"valid":true}
curl --location --request POST 'https://zylalabs.com/api/11900/license+verification+and+activation+api/22616/validate+license' --header 'Authorization: Bearer YOUR_API_KEY'
--data-raw '{
"licenseKey": "TEST-LICENSE-123",
"deviceId": "device-abc-001"
}'
| Header | Description |
|---|---|
Authorization
|
[Required] Should be Bearer access_key. See "Your API Access Key" above when you are subscribed. |
No long-term commitment. Upgrade, downgrade, or cancel anytime. Free Trial includes up to 50 requests.
LicenseGuard prevents license key sharing, enforces per-device activation limits, and automatically revokes access after refunds — without you building your own licensing backend.
Call the /validate endpoint with a license key and device ID from your app. You’ll receive a clear JSON response indicating whether the license is valid.
Yes. It’s ideal for desktop software, plugins, games, and downloadable tools distributed outside app stores.
Yes. You can restrict how many devices a license can activate.
Access can be revoked automatically depending on your configuration.
Yes. Zyla provides a 7-day free trial so you can test integration before committing.
It’s primarily designed for license-key based products. For SaaS subscription management, additional logic may be required.
Yes. LicenseGuard runs on a scalable hosted backend and is designed for real-world production usage.
The /validate endpoint returns a JSON response indicating the validity of the license key. It includes a boolean field "valid" that specifies whether the license is active and meets activation limits.
The primary field in the response from the /validate endpoint is "valid," which is a boolean indicating if the license key is valid. Additional fields may be included in future updates for more detailed responses.
The response data from the /validate endpoint is structured in JSON format. It typically contains key-value pairs, making it easy to parse and integrate into applications.
The /validate endpoint accepts two parameters: "licenseKey" (the key to validate) and "deviceId" (the unique identifier for the device attempting activation).
Users can customize requests to the /validate endpoint by providing different "licenseKey" and "deviceId" values to check the validity of specific licenses on various devices.
Typical use cases include validating software licenses during installation, enforcing activation limits for plugins, and managing access for SaaS applications based on license status.
Data accuracy is maintained through secure validation processes and real-time checks against the licensing database, ensuring that only valid licenses are activated.
If the /validate endpoint returns an empty or partial result, it typically indicates an invalid license or an unregistered device. Users should implement error handling to manage these scenarios effectively.
To obtain your API key, first sign in to your account and navigate to the API you want to use. From the API's Pricing section, choose a plan and complete the subscription process. Once subscribed, return to the API page and you will see your API Access Key displayed at the top of the documentation page. You can use this key to authenticate your requests.
You can’t switch APIs during the free trial. If you subscribe to a different API, your trial will end and the new subscription will start as a paid plan.
The free trial lasts for 7 days and allows you to make up to 50 API requests.
No, the free trial is available only once, so we recommend using it on the API that interests you the most. Most of our APIs offer a free trial, but some may not include this option.
Yes. If the API offers a free trial, you will see a "Free 7-Day Trial" option in its Pricing section. The trial lasts for 7 days and allows up to 50 API requests, enabling you to evaluate the API before subscribing to a paid plan.
Zyla API Hub is like a big store for APIs, where you can find thousands of them all in one place. We also offer dedicated support and real-time monitoring of all APIs. Once you sign up, you can pick and choose which APIs you want to use. Just remember, each API needs its own subscription. But if you subscribe to multiple ones, you'll use the same key for all of them, making things easier for you.
You can monitor your API usage through the response headers included with every request:
x-zyla-api-calls-monthly-used: Shows the total number of API requests you have used during the current billing period.
x-zyla-api-calls-monthly-remaining: Shows the number of API requests you have remaining for the current billing period.
Yes, you can cancel your subscription at any time. Simply go to the Pricing section of the API you're subscribed to and click the "Unsubscribe" button.
Please note that upgrades, downgrades, and cancellations take effect immediately. Once your subscription is canceled, access to the service will end immediately, regardless of any remaining API calls in your quota.
Please have a look at our Refund Policy: https://zylalabs.com/terms#refund
Service Level:
100%
Response Time:
282ms
Service Level:
100%
Response Time:
129ms
Service Level:
100%
Response Time:
137ms
Service Level:
100%
Response Time:
294ms
Service Level:
100%
Response Time:
315ms
Service Level:
100%
Response Time:
314ms
Service Level:
100%
Response Time:
139ms
Service Level:
100%
Response Time:
113ms
Service Level:
100%
Response Time:
104ms
Service Level:
100%
Response Time:
137ms