Email APIs split into three jobs: sending transactional mail, validating addresses, and detecting disposable domains. Validators are cheap (or free at low volume) and prevent bad data at signup; senders like Resend and SendGrid price per message with monthly allowances. Test CORS carefully — validation endpoints are browser-safe, but sending credentials should never leave your server.
| API | Pricing | Auth | CORS | Health | |
|---|---|---|---|---|---|
| AGPC Domain Check API Check a domain's SPF, DKIM, DMARC and MX with a graded shareable report | Unknown | Unknown | Yes | Profile | |
| AWS QLDBSession API Official AWS QLDBSession service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS SES API Official AWS SES service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| Abstract Email Validation Validate email addresses for deliverability and spam | Freemium | API Key | No | Profile | |
| Academic Email API This API allows you to verify whether an email belongs to a recognized educational institution | Freemium | API Key | No | Profile | |
| ApiManagementClient API 7 Use these REST APIs for performing operations on Cache entity in your Azure API Management deployment. Azure API Management also allows for caching responses in an external Azure Cache for Redis. For more information ref | Unknown | Unknown | Yes | Profile | |
| Atomic Mail API Email for AI agents: programmatic inbox creation and send/receive over JMAP | Unknown | API Key | Unknown | Profile | |
| Brainbi brainbi API Welcome to the official API of the brainbi platform. Using this API you can freely integrate our analytics platform with any other solution. Please refer to the following documentation and in case of any issues, please c | Free | API Key | Yes | Profile | |
| Brevo API Transactional email, SMS, contacts, campaigns, and marketing automation API. Base URL https://api.brevo.com/v3, API-key header auth. | Freemium | API Key | Yes | Profile | |
| Checks API **NOTE:** This is a preview of the API and it is not considered stable since refinements are still being made. # Introduction Welcome to the **Truora Check** [**RESTful API**](https://en.wikipedia.org/wiki/Representation | Unknown | Unknown | Yes | Profile | |
| Cloudmersive Validate Validate email addresses, phone numbers, VAT numbers and domain names | Freemium | API Key | No | Profile | |
| Corrently.io API *Corrently - from italian corrente, which is energy* # Introduction The Corrently ecosystem gets maintained by [STROMDAO GmbH](https://www.stromdao.de/) to support green energy services for prosumers, grid operators, reg | Unknown | Unknown | Yes | Profile | |
| Disify Validate and detect disposable and temporary email addresses | Free | No | No | Profile | |
| DropMail GraphQL API for creating and managing ephemeral e-mail inboxes | Free | No | No | Profile | |
| Email Activity (beta) API The Beta endpoints for the new Email Activity APIs - functionality is subject to change without notice. You may not have access to this Beta endpoint. Email Activity offers filtering and search by event type for two days | Unknown | Unknown | Yes | Profile | |
| EmailJS API Send emails directly from client-side JavaScript without a backend server | Unknown | API Key | Yes | Profile | |
| Emailvalidation E-Mail address validation | Freemium | API Key | No | Profile | |
| Enterobase-API API for EnteroBase (https://enterobase.warwick.ac.uk) EnteroBase is a user-friendly online resource, where users can upload their own sequencing data for de novo assembly by a stream-lined pipeline. The assemblies are us | Unknown | Unknown | Yes | Profile | |
| Enveloop Design, host, and send emails and texts. All from one place - with a simple API | Freemium | API Key | No | Profile | |
| Fake identity generation API Generate random fake identities (name, address, email, phone , credit card info etc). [Click here to subscribe](http://fungenerators.com/api/fakeidentity/) | Unknown | Unknown | Yes | Profile | |
| Google Cloud Storage for Firebase API Official Google Cloud Storage for Firebase API REST API (v1beta) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Google Rapid Migration Assessment API Official Google Rapid Migration Assessment API REST API (v1) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Google Wallet API Official Google Google Wallet API REST API (v1) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Guerrilla Mail Disposable temporary Email addresses | Free | No | No | Profile | |
| Heybounce Email Verification API | Freemium | No | No | Profile | |
| Heybounce Email Verification Validate and verify email addresses for deliverability and bounce detection. | Free | No | No | Profile | |
| ImprovMX API for free email forwarding service | Freemium | API Key | Yes | Profile | |
| IndiePitcher Everything email for your startup with markdown support | Freemium | API Key | No | Profile | |
| Instagram API Description of Instagram RESTful API. Current limitations: * Instagram service does not support [cross origin headers](https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS) for security reasons, therefor | Unknown | Unknown | Yes | Profile | |
| Intel Product Catalogue Service API This is the documentation for PIM Micro services. In order to use this tool you need to have Basic Auth credentials and a client id. If you dont have one, please make sure to request one by sending an email to the PIM MS | Unknown | Unknown | Yes | Profile | |
| Just Eat UK API # Just Eat API Just Eat offers services for our various business partners and our consumer applications. How you interact with the API depends on the services you wish to interact with. ## Security ### HTTPS All api call | Unknown | Unknown | Yes | Profile | |
| Kickbox Email verification API | Freemium | No | Yes | Profile | |
| Kiprio Email Validate API Free email validation: MX check, disposable detection, syntax | Free | API Key | Yes | Profile | |
| Linqr App LinQR API This is LinQR QR Code API documentation. This API allows you to generate custom, visually attractive QR Codes. The cloud infrastructure guarantees high availability and autoscalability of the service. You can generate hu | Unknown | Unknown | Yes | Profile | |
| Loops API Email marketing and transactional messaging API for SaaS products. | Freemium | API Key | Yes | Profile | |
| MailCheck.ai Prevent users to sign up with temporary email addresses | Free | No | No | Profile | |
| MailboxValidator Validate email address to improve deliverability | Freemium | API Key | No | Profile | |
| MailboxValidator Free Email Checker API The MailboxValidator Free Email Checker checks if a single email address is from a free email provider and returns the results in either JSON or XML format. Refer to https://www.mailboxvalidator.com/api-email-freem for f | Unknown | Unknown | Yes | Profile | |
| Mailchimp Transactional API Transactional email sending API formerly known as Mandrill. | Freemium | API Key | Yes | Profile | |
| MailerSend API MailerSend API by Brevo for transactional email with templates, suppression management, SMS, and inbound email routing. | Freemium | API Key | No | Profile | |
| Mailgun API Email sending, validation, routing, and deliverability API. | Freemium | API Key | Yes | Profile | |
| Mailjet API Mailjet API for sending marketing and transactional email at scale with campaign builder integration and real-time statistics. | Freemium | API Key | No | Profile | |
| Mailsquad API MailSquad offers an affordable and super easy way to create, send and track delightful emails. | Unknown | Unknown | Yes | Profile | |
| Mailtrap A service for the safe testing of emails sent from the development and staging environments | Freemium | API Key | No | Profile | |
| Mandrill API Mandrill is a reliable, scalable, and secure delivery API for transactional emails from websites and applications. It's ideal for sending data-driven transactional emails, including targeted e-commerce and personalized o | Unknown | Unknown | Yes | Profile | |
| NamSor API v2 API NamSor API v2 : enpoints to process personal names (gender, cultural origin or ethnicity) in all alphabets or languages. By default, enpoints use 1 unit per name (ex. Gender), but Ethnicity classification uses 10 to 20 u | Unknown | API Key | Yes | Profile | |
| Netlify's API documentation API Netlify is a hosting service for the programmable web. It understands your documents and provides an API to handle atomic deploys of websites, manage form submissions, inject JavaScript snippets, and much more. This is a | Freemium | Unknown | Yes | Profile | |
| Neutrino API The general-purpose API | Unknown | Unknown | Yes | Profile | |
| Notilify A seamless messaging platform & API to send all types of SMS | Freemium | API Key | No | Profile | |
| Ntropy Transaction API v1 API Ntropy Transaction API for transaction classification & management Contact Support: Name: API Support Email: api@ntropy.network | Paid | Unknown | Yes | Profile | |
| Pims Pims API Hereafter is the documentation of the private API of [Pims: Pointages Intelligents pour le Monde du Spectacle](https://pims.io). This API is designed for 3rd-party softwares, editors and partners. Its main purpose is to | Unknown | Unknown | Yes | Profile | |
| Postmark API Postmark API for fast, reliable transactional email delivery with inbound processing, message streams, and detailed bounce analytics. | Paid | API Key | No | Profile | |
| Postmark Account-level API Postmark makes sending and receiving email incredibly easy. The Account-level API allows users to configure all Servers, Domains, and Sender Signatures associated with an Account. | Paid | API Key | Yes | Profile | |
| Proweblook Email Checker Validate email addresses without sending | Freemium | API Key | No | Profile | |
| Quick start - Telematics SDK API # Introduction We have prepared a set of APIs for quick start to integrate telematics SDK that powers mobile telematics inside 3rd party mobile applications. * [CONTACT US](https://telematicssdk.com) * [SANDBOX](https:// | Unknown | API Key | Yes | Profile | |
| Rawg RAWG Video Games Database API The largest open video games database. ### Why build on RAWG - More than 350,000 games for 50 platforms including mobiles. - Rich metadata: tags, genres, developers, publishers, individual creators, official websites, re | Unknown | API Key | Yes | Profile | |
| Resend Developer email API for sending transactional email. Base URL https://api.resend.com, Bearer API-key auth, POST /emails. | Freemium | API Key | No | Profile | |
| RiteKit API RiteKit API is based on REST principles. Authentication uses standard OAuth 2.0 process ##Getting started 1. Sign up for [RiteKit](https://ritekit.com/) 1. Go to [developer dashboard](https://ritekit.com/developer/dashbo | Unknown | Unknown | Yes | Profile | |
| Sendgrid A cloud-based SMTP provider that allows you to send emails without having to maintain email servers | Freemium | API Key | No | Profile | |
| Sendinblue A service that provides solutions relating to marketing and/or transactional email and/or SMS | Freemium | API Key | No | Profile | |
| Sheetlabs rv API # Introduction This API returns information about all of the verses in Rig Veda. The results are JSON objects that contain the name of the god, poet, and meter of the verses in Rig Veda, the category of the god and the p | Paid | Unknown | Yes | Profile | |
| ShipEngine API ShipEngine's easy-to-use REST API lets you manage all of your shipping needs without worrying about the complexities of different carrier APIs and protocols. We handle all the heavy lifting so you can focus on providing | Unknown | Unknown | Yes | Profile | |
| Sweego Self-serve multichannel notification platform for transactional email, SMS, push web& mobile, chat, in-app | Freemium | API Key | No | Profile | |
| Sweep Emails Reliable email validation API with Free tier | Free | API Key | No | Profile | |
| TVmaze user API Access to the user API is only possible for users with a [premium](http://www.tvmaze.com/premium) account. A user can only access their own user data. Authentication uses HTTP Basic. Use the TVmaze username as authentica | Unknown | Unknown | Yes | Profile | |
| Temporary and Disposable emails API This API provides temporary & disposable email addresses | Free | API Key | No | Profile | |
| TheTVDB API v3 API API v3 targets v2 functionality with a few minor additions. The API is accessible via https://api.thetvdb.com and provides the following REST endpoints in JSON format. How to use this API documentation ---------------- Y | Unknown | Unknown | Yes | Profile | |
| TruAnon Private API Welcome to TruAnon! Thank you for helping make the Internet a safer place to be. Adopting TruAnon is simple. There is no setup or dependencies, nothing to store or process. Making identity part of your service is fun, an | Paid | Unknown | Yes | Profile | |
| Trueguard Trueguard offers API for detecting temporary emails, free-tier abusers and automated bots | Freemium | API Key | Yes | Profile | |
| Twilio SendGrid API Email sending, contacts, templates, stats, and marketing APIs from SendGrid. | Freemium | API Key | Yes | Profile | |
| Verifier Verifies that a given email is real | Freemium | API Key | Unknown | Profile | |
| Voodoo Manufacturing 3D Print API Welcome to the Voodoo Manufacturing API docs! Your Voodoo Manufacturing API key must be included with each request to the API. The API will look for the key in the "api_key" header of the request. <a href="https://voodoo | Unknown | Unknown | Yes | Profile | |
| Wikimedia API This API provides cacheable and straightforward access to Wikimedia content and data, in machine-readable formats. ### Global Rules - Limit your clients to no more than 200 requests/s to this API. Each API endpoint's doc | Paid | Unknown | Yes | Profile | |
| Zyntra Unlimited e-mail inboxes with API access. Catch OTPs, reset links, and sign-up emails in test flows | Freemium | API Key | No | Profile | |
| mail.gw 10 Minute Mail | Free | No | Yes | Profile | |
| mail.tm Temporary Email Service | Free | No | No | Profile | |
| mailboxlayer API Email address validation | Paid | API Key | Unknown | Profile | |
| nFusion Solutions Market Data API [nFusion Solutions](https://nfusionsolutions.com) provides [REST APIs](https://nfusionsolutions.com/data-feeds/) that deliver enterprise-grade financial data. Data sets include real-time and historical pricing for Spot p | Paid | Unknown | Yes | Profile | |
| perfectpdf api The perfectpdf api does one thing, perfectly: it converts html to pdf. The perfectpdf api uses headless Google Chrome to provide a low cost, high quality, simple to use service. | Unknown | API Key | Yes | Profile | |
| setlist.fm API <p> The setlist.fm API has been designed to give you easy access to setlist data in order to build fancy websites and other applications. Before starting to use the API, be sure to ... <ol> <li>... understand how setlist | Unknown | Unknown | Yes | Profile |
Start with pricing and auth: free tiers and no-auth APIs are fastest to prototype with. Then check CORS if your app calls the API from the browser, and health before you commit — a great API that's been down for a week will block your launch. Each profile below shows all of these signals plus rate limits where documented.