# emailvalidation > emailvalidation validates and verifies email addresses, returning deliverability, syntax, MX, disposable and free-provider signals over a simple JSON REST API. Authenticate every request with your API key via the `apikey` query parameter or request header. Base URL: https://api.emailvalidation.io ## Documentation - [Introduction](https://emailvalidation.io/docs): Learn everything there is to know about the emailvalidation.io API and integrate emailvalidation.io into your product. - [Authentication](https://emailvalidation.io/docs/authentication): In this guide, we’ll look at how authentication works. emailvalidation.io offers two ways to authenticate your API requests: via GET parameter or alternatively via a HTTP header. - [Email Information Endpoint](https://emailvalidation.io/docs/info): On this page, we’ll dive into the email information endpoint you can use to retrieve information about any email address in order to verify & validate it. - [MCP Server](https://emailvalidation.io/docs/mcp): Connect AI agents to the emailvalidation API through our hosted MCP (Model Context Protocol) server. - [Quickstart](https://emailvalidation.io/docs/quickstart): This guide will get you all set up and ready to use the emailvalidation.io API. We’ll cover how to get started an API client and how to make your first API request. - [Rate Limit & Quotas](https://emailvalidation.io/docs/rate-limit): In this guide, we will look at how many open connections you can have with the emailvalidation.io API. - [SDKs](https://emailvalidation.io/docs/sdks): emailvalidation offers fine-tuned JavaScript, Ruby, PHP, Python, and Go libraries to make your life easier and give you the best experience when consuming the API. - [Status Endpoint](https://emailvalidation.io/docs/status): On this page, we’ll dive into the API status endpoint you can use to retrieve information about your request quota programmatically. - [Request Status Codes](https://emailvalidation.io/docs/status-codes): In this guide, we will talk about what happens when something goes wrong while you work with the API. - [Testing](https://emailvalidation.io/docs/testing): On this page, we’ll dive into testing the different API responses. ## API Reference - [OpenAPI 3.1 specification](https://emailvalidation.io/docs/openapi.yaml): Machine-readable spec for every API endpoint, parameters and responses. - [Full documentation as markdown](https://emailvalidation.io/docs/llms-full.txt): All documentation pages concatenated as plain markdown. ## Optional - [Pricing & plans](https://emailvalidation.io/#pricing)