# HLR Lookup

> Real-time HLR, MNP, number validation and credit balance API. REST over HTTPS, JSON bodies, single-number or batch (up to 80) requests. Authentication is `api_key` + `api_secret` on every call.

## API

- [OpenAPI 3.1 schema](https://www.hlrlookup.com/hlr-api-v2.openapi.json): Machine-readable description of API v2 (`/apiv2/hlr`, `/apiv2/mnp`, `/apiv2/validate`, `/apiv2/balance`). Importable into Postman, Insomnia, Swagger UI, Redocly, or any OpenAPI-compatible code generator.
- [Knowledge base (v2)](https://www.hlrlookup.com/knowledge): Prose documentation, integration guides, and examples.

## Site

- [Home](https://www.hlrlookup.com/): Product overview, pricing, sign-up.
- [Contact](https://www.hlrlookup.com/contact): Support and sales.