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Braze is a comprehensive customer engagement platform that powers relevant and memorable experiences between consumers and the brands they love. | 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. |
| - | 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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Intercom is a customer communication platform with a suite of integrated products for every team—including sales, marketing, product, and support. Have targeted communication with customers on your website, inside apps, and by email.

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.

Customer engagement platform for tech savvy marketers sending personalized, data-driven marketing, product, and transactional messages. Ideal for mid-market SaaS, FinTech, EdTech, mobile apps, marketplaces companies, and more.

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.