Messaging APIs let you add messaging capabilities without building from scratch. Every entry below is profiled with trust signals — pricing model, authentication requirements, CORS support, rate limits, and live uptime checks — so you can compare options and pick production-safe choices instead of guessing from a link list.
| API | Pricing | Auth | CORS | Health | |
|---|---|---|---|---|---|
| API iSendPro API [1] Liste des fonctionnalités : - envoi de SMS à un ou plusieurs destinataires, - lookup HLR, - récupération des récapitulatifs de campagne, - gestion des répertoires, - ajout en liste noire. - comptage du nombre de cara | Paid | Unknown | Yes | Profile | |
| AWS Chime API Official AWS Chime service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS CodeStarNotifications API Official AWS CodeStarNotifications service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS Connect API Official AWS Connect service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS DirectConnect API Official AWS DirectConnect service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS EC2InstanceConnect API Official AWS EC2InstanceConnect service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS MediaConnect API Official AWS MediaConnect service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS Pinpoint API Official AWS Pinpoint service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS PinpointSMSVoice API Official AWS PinpointSMSVoice service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS SMS API Official AWS SMS service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS SNS API Official AWS SNS service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS SQS API Official AWS SQS service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| Apache Qakka API API for Qakka Queue System | Open Source | Unknown | Yes | Profile | |
| Avaza API Documentation API Welcome to the autogenerated documentation & test tool for Avaza's API. <br/><br/><strong>API Security & Authentication</strong><br/>Authentication options include OAuth2 Implicit and Authorization Code flows, and Person | Unknown | Unknown | Yes | Profile | |
| Azure Api Management Api Management API 2017-03-01 13 Official Microsoft Azure REST API OpenAPI specification for specification/apimanagement/resource-manager/Microsoft.ApiManagement/ApiManagement/stable/2017-03-01/apimnotifications.json. | Paid | API Key | Yes | Profile | |
| Azure Api Management Api Management API 2017-03-01 8 Official Microsoft Azure REST API OpenAPI specification for specification/apimanagement/resource-manager/Microsoft.ApiManagement/ApiManagement/stable/2017-03-01/apimemailtemplate.json. | Paid | API Key | Yes | Profile | |
| Azure Api Management Api Management API 2018-01-01 Official Microsoft Azure REST API OpenAPI specification for specification/apimanagement/resource-manager/Microsoft.ApiManagement/ApiManagement/stable/2018-01-01/apimemailtemplate.json. | Paid | API Key | Yes | Profile | |
| Azure Api Management Api Management API 2018-01-01 15 Official Microsoft Azure REST API OpenAPI specification for specification/apimanagement/resource-manager/Microsoft.ApiManagement/ApiManagement/stable/2018-01-01/apimnotifications.json. | Paid | Unknown | Yes | Profile | |
| Azure Api Management Api Management API 2019-01-01 13 Official Microsoft Azure REST API OpenAPI specification for specification/apimanagement/resource-manager/Microsoft.ApiManagement/ApiManagement/stable/2019-01-01/apimemailtemplates.json. | Paid | API Key | Yes | Profile | |
| Azure Api Management Api Management API 2019-01-01 19 Official Microsoft Azure REST API OpenAPI specification for specification/apimanagement/resource-manager/Microsoft.ApiManagement/ApiManagement/stable/2019-01-01/apimnotifications.json. | Paid | Unknown | Yes | Profile | |
| Azure Api Management Api Management API 2019-12-01 12 Official Microsoft Azure REST API OpenAPI specification for specification/apimanagement/resource-manager/Microsoft.ApiManagement/ApiManagement/stable/2019-12-01/apimemailtemplates.json. | Paid | API Key | Yes | Profile | |
| Azure Api Management Api Management API 2019-12-01 20 Official Microsoft Azure REST API OpenAPI specification for specification/apimanagement/resource-manager/Microsoft.ApiManagement/ApiManagement/stable/2019-12-01/apimnotifications.json. | Paid | API Key | Yes | Profile | |
| Azure Api Management Api Management API 2020-12-01 13 Official Microsoft Azure REST API OpenAPI specification for specification/apimanagement/resource-manager/Microsoft.ApiManagement/ApiManagement/stable/2020-12-01/apimemailtemplates.json. | Paid | API Key | Yes | Profile | |
| Azure Api Management Api Management API 2020-12-01 21 Official Microsoft Azure REST API OpenAPI specification for specification/apimanagement/resource-manager/Microsoft.ApiManagement/ApiManagement/stable/2020-12-01/apimnotifications.json. | Paid | API Key | Yes | Profile | |
| Azure Api Management Api Management API 2024-05-01 19 Official Microsoft Azure REST API OpenAPI specification for specification/apimanagement/resource-manager/Microsoft.ApiManagement/ApiManagement/stable/2024-05-01/apimnotifications.json. | Paid | API Key | Yes | Profile | |
| Azure Api Management Api Management API 2024-05-01 27 Official Microsoft Azure REST API OpenAPI specification for specification/apimanagement/resource-manager/Microsoft.ApiManagement/ApiManagement/stable/2024-05-01/apimemailtemplates.json. | Paid | API Key | Yes | Profile | |
| Bird API Bird API for omnichannel messaging: SMS, WhatsApp, voice, email, and chatbot with AI-powered conversations and global carrier network. | Paid | API Key | No | Profile | |
| Contract.fit API This OpenAPI describes the API exposed by the contract.fit backend. ## Security ### Authentication All endpoints are protected: you need to make authenticated calls. There are 3 authentication mechanisms: - HTTP Basic (U | Unknown | Unknown | Yes | Profile | |
| Conversation API The Conversation API enables you to build conversation features where communication can take place across multiple mediums including IP Messaging, PSTN Voice, SMS and WebRTC Audio and Video. The context of the conversati | Unknown | Unknown | Yes | Profile | |
| D7networks D7SMS API D7 SMS allows you to reach your customers via SMS over D7's own connectivity to global mobile networks. D7 provides reliable and cost-effective SMS services to businesses across all industries and aims to connect all cou | Paid | API Key | Yes | Profile | |
| DaniWeb Connect API User Recommendation Engine and Chat Network | Unknown | Unknown | Yes | Profile | |
| Discord Make bots for Discord, integrate Discord onto an external platform | Free | OAuth | No | Profile | |
| Google Advisory Notifications API Official Google Advisory Notifications API REST API (v1) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Google BigQuery Connection API Official Google BigQuery Connection API REST API (v1beta1) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Google Chat API Official Google Google Chat API REST API (v1) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Google Connectors API Official Google Connectors API REST API (v1) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Google Developer Connect API Official Google Developer Connect API REST API (v1) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Google Firebase SQL Connect API Official Google Firebase SQL Connect API REST API (v1beta) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Google GKE Hub API Official Google GKE Hub API REST API (v1alpha) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Google My Business Notifications API Official Google My Business Notifications API REST API (v1) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Google Network Connectivity API Official Google Network Connectivity API REST API (v1alpha1) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Infobip API Infobip API for omnichannel messaging: SMS, WhatsApp, Viber, push, email, voice, and chatbot across 190+ countries. | Paid | API Key | No | Profile | |
| OneSignal Push notification, email, SMS, and in-app messaging API. Send targeted messages, manage segments, track delivery, and analyze engagement across channels. | Freemium | API Key | No | Profile | |
| Plivo API Plivo API for programmable SMS, voice, WhatsApp, and MMS with global carrier coverage, phone number provisioning, and call routing. | Paid | API Key | No | Profile | |
| Pusher Beams Push notifications for Android & iOS | Freemium | API Key | No | Profile | |
| Pusher Channels Realtime features | Freemium | API Key | No | Profile | |
| Sent.dm Sent is a unified API for messaging across SMS and apps
like WhatsApp | Freemium | API Key | Yes | Profile | |
| Sinch API Sinch API for SMS, WhatsApp, voice, video, and email verification across 200+ countries with carrier-grade infrastructure. | Paid | API Key | No | Profile | |
| Slack Team Instant Messaging | Freemium | OAuth | No | Profile | |
| Svix Webhooks as a Service | Freemium | API Key | Yes | Profile | |
| Telegram Bot Simplified HTTP version of the MTProto API for bots | Free | API Key | Yes | Profile | |
| Telegram Bot API Auto-generated OpenAPI schema | Unknown | Unknown | Yes | Profile | |
| Telnyx API Telnyx API for programmable SMS, voice, MMS, fax, video, and SIP trunking with global number provisioning and call control. | Paid | API Key | Yes | Profile | |
| Telnyx Telnyx API SIP trunking, SMS, MMS, Call Control and Telephony Data Services. | Paid | API Key | Yes | Profile | |
| The Mercure protocol API [Mercure](https://mercure.rocks) is a protocol allowing to push data updates to web browsers and other HTTP clients in a convenient, fast, reliable and battery-efficient way. | Free | Unknown | Yes | Profile | |
| The SMS Works API The SMS Works provides a low-cost, reliable SMS API for developers. Pay only for delivered texts, all failed messages are refunded. | Paid | API Key | Yes | Profile | |
| Twilio Programmable Messaging API Send and receive SMS, MMS, WhatsApp, and RCS messages and track delivery. | Freemium | API Key | No | Profile | |
| Urlbox API A plugin that allows the user to capture screenshots of a web page from a URL or HTML using ChatGPT. | Unknown | Unknown | Yes | Profile | |
| Visitor Identification API The Visitor Identification API allows you to pass identification information to the HubSpot chat widget for otherwise unknown visitors that were verified by your own authentication system. | Unknown | Unknown | Yes | Profile | |
| Vonage Messages API Vonage Messages API for sending SMS, MMS, WhatsApp, Viber, and Messenger messages through one unified endpoint, plus dispatch workflows and delivery receipts. | Paid | API Key | No | Profile | |
| WhatsApp Business Cloud API Meta WhatsApp Business Cloud API for sending and receiving WhatsApp messages, templates, media, phone-number management, and webhooks. Template messages are billed per conversation category; service conversations are free. Graph API access-token authentication. | Paid | OAuth | No | Profile | |
| Winsms Co Za WINSMS API WinSMS RESTful API | Unknown | Unknown | Yes | Profile | |
| httpSMS Use your Android phone as an SMS gateway to send and receive SMS messages via a simple HTTP API | Freemium | API Key | No | Profile | |
| sms77.io API sms77.io Swagger API. Get your API-Key now at sms77.io. | Unknown | Unknown | Yes | Profile | |
| www.zoomconnect.com API The world's greatest SMS API | 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.