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It is an API-first email hosting service with a user-friendly interface. It provides affordable scalability for small & large businesses using dedicated email servers without any per-user/per-domain limits. Furthermore, the powerful API enables you to meet your changing business requirements with ease. | Send WhatsApp messages, SMS, OTP codes, and transactional email via one REST API. Official Meta Business Partner. 3-day free trial — no credit card required. |
Email hosting; Email management; API support; Dedicated email servers; Unlimited mailboxes; Accessible at all times; Easy setup & migration | One unified API key for all channels — no per-product accounts, Self-serve signup — live in minutes, no sales call required, Transparent flat pricing — from $9/month, no per-message surprises, Type-safe SDKs for TypeScript, Python, and Go, Idempotency keys for safe retries |
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Twilio offers developers a powerful API for phone services to make and receive phone calls, and send and receive text messages. Their product allows programmers to more easily integrate various communication methods into their software and programs.

Nexmo connects your apps directly to carriers around the world. Integrate SMS and Voice messages using one simple API. Use Nexmo Verity to register users, verify transactions, and implement two factor authentication.

An easy to use email app that saves you time and keeps your messages safe. Get your messages instantly via push notifications, read and respond online & offline, and find any message quickly.

TapTalk.io is a complete in-app chat SDK and messaging API. It designed to be easy to implement and give your user the best in-app chat experience. We provide you customizable UI based implementation and code based implementation.

mailparser.io is a web-based email processing software which allows you to pull any kind of data from incoming e-mails based on custom parsing rules. The parsed data can be sent to any API with webhooks.

Plivo provides basic building block APIs in the form of Plivo XML and HTTP API, to create telephony apps, so developers can completely do away with learning the nitty-gritty of the telephony plumbing.

Add In-App User-to-User Communication into Mobile Apps & Websites, with rich & engaging Text Chat, Video, and Audio Calling experiences, to Increase User Engagement and Enable new Revenue Streams.

Agora.io provides building blocks for you to add real-time voice and video communications through a simple and powerful SDK. You can integrate the Agora SDK to enable real-time communications in your own application quickly.

This API allows you to build your own customized Telegram clients. It is 100% open for all developers who wish to create Telegram applications on our platform.

It is the world's largest secure email service, developed by CERN and MIT scientists. We are open source and protected by Swiss privacy law