# AuthGuard

AuthGuard is a Russian-language B2B API for checking the mail infrastructure of an email domain before user registration. It resolves MX records, identifies a known mail provider and returns a technical decision with supporting data.

The service does not check whether an individual mailbox exists, does not inspect email contents and does not provide a legal guarantee of compliance.

## Canonical resources

- Product: https://authguard.ru/
- Human-readable API documentation: https://authguard.ru/docs
- OpenAPI specification: https://authguard.ru/openapi.json
- Check methodology: https://authguard.ru/legal/methodology
- Terms: https://authguard.ru/legal/terms
- Support: https://authguard.ru/support

## API

- Base URL: https://api.authguard.ru
- Method: POST /v1/check/email
- Authentication: Authorization: Bearer <API_KEY>
- Content-Type: application/json
- Request body: {"email":"user@company.ru"}
- Primary integration field: can_register

API keys are secrets. Calls must be made from trusted server-side code, not from browser JavaScript or a distributed mobile application.

For exact request, response and error schemas, use the OpenAPI specification. Do not infer legal conclusions beyond the published methodology.