License validation and CID, one backend.
Check Microsoft product keys, read remaining MAK activations, and get confirmation IDs for phone activation. Built for resellers, repair shops, IT teams and platforms.
What you can check
Read-only lookups against Microsoft activation services. No product is activated on our side.
Product key validation
Product family, edition, license channel, and remaining MAK activations where available.
CID / confirmation ID
Submit an installation ID and receive a confirmation ID for phone activation. Single or batch.
Batch & image OCR
Up to 50 keys per request, or upload a screenshot and let OCR read the key.
Pricing
Fixed USD pricing. Volume tiers are listed below; no temporary discounts.
| Detection | Price | Per key |
|---|---|---|
| 1,000 keys | $14.99 | $0.015 |
| 5,000 keys | $69.99 | $0.014 |
| 10,000 keys | $129.99 | $0.013 |
| CID | Price | Per CID |
|---|---|---|
| 100 CID | $8.99 | $0.090 |
| 500 CID | $27.99 | $0.056 |
| 1,000 CID | $41.99 | $0.042 |
| 2,000 CID | $55.99 | $0.028 |
Fixed USD pricing. Taxes may apply by region.
API for your own frontend
Build your own key-check or CID page. We provide the backend; you keep your brand and customers.
Batch checks, CID, OCR, error codes and rate limits: API documentation.
Windows desktop app
Inventory & recheck
Import supplier batches, recheck before delivery, keep invalid keys separate.
Online operations
Track online keys, MAK remaining activations, rotation suggestions and sellable days.
After-sales trace
Look up an order, its delivered key, checks and CID history in one place.
Desktop app is currently available with a Chinese UI; an English UI build is in progress.
Contact
For API access, volume pricing or partnership, contact us.
Telegram: @yizhouruanjian
Channel: @yizhou_api
Email: [email protected]
Website: https://yizhouruanjian.com
API onboarding: /en/start