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Realtime

A topic catalog of realtime APIs, protocols, providers, and patterns. Realtime distinguishes itself from streaming by being interactive and typically bidirectional — channels, presence, signaling, and message envelopes flowing in both directions between clients and servers — where streaming is one-way firehose delivery. This index documents the major realtime protocols (WebSocket, Server-Sent Events, WebRTC, MQTT, CoAP, gRPC streaming, GraphQL Subscriptions), hosted realtime providers (Ably, Pusher, PubNub, LiveKit, Daily, Agora, Twilio, Vonage, Amazon IVS, Cloudflare Realtime), open-source frameworks (Socket.IO), and push notification systems (OneSignal, FCM, APNs, Web Push, Pushwoosh).

90 related providers on APIs.io 26 resources Source repository →

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Providers working in Realtime

Providers whose own tags share at least two of this topic's tags, most shared first — the top 30 of 90.

ProviderAboutRatingAPIs
HiveMQ HiveMQ is an enterprise MQTT broker and IoT connectivity platform that provides reliable, scalable bidirectional messaging between connected devices and back-end systems using the MQTT protocol. It supports MQTT 3, MQTT 5, MQTT over WebSoc… developing 1
Ably Ably is a realtime messaging platform offering pub/sub, presence, push notifications, chat, LiveSync, and integrations over WebSocket and HTTP. Ably publishes its OpenAPI specifications publicly via the ably/open-specs GitHub repository, w… developing 2
Pusher Pusher is a realtime communication platform owned by MessageBird/Bird. Its primary product Channels provides pub/sub messaging over WebSocket and HTTP; Beams provides device push notifications. Authentication uses an app key + secret per P… thin 1
PubNub PubNub is a realtime communication platform supporting pub/sub, presence, chat, App Context (object metadata), Functions (server-less compute on the edge), Push Notifications, and IoT messaging across 1B+ devices. The PubNub REST API runs… thin 2
Liveblocks Liveblocks is a real-time collaboration platform that provides ready-made building blocks for multiplayer experiences, including presence, broadcast events, shared storage (LiveObject/LiveList/LiveMap), comments and threads, notifications,… strong 1
Azure Web PubSub Azure Web PubSub is a fully-managed service that enables building real-time, two-way messaging applications using publish-subscribe patterns over WebSockets. It supports broadcasting messages to clients in groups, sending messages to speci… developing 1
SuperViz SuperViz provides real-time collaboration and data-synchronization infrastructure for web applications - presence, realtime data channels, video huddle/meetings, contextual comments, and mouse pointers. The product is SDK-first (@superviz/… developing 1
Wazo Wazo Communication Inc. builds the Wazo Platform, an open-source (GPL-3.0) programmable unified-communications and contact-centre platform assembled from Asterisk, Kamailio, RabbitMQ, PostgreSQL and nginx, which MSPs, carriers, telecom int… thin 25
Agora Agora is a real-time engagement platform providing ultra-low latency voice, video, signaling, chat, interactive whiteboard, cloud recording, real-time speech-to-text, and conversational AI infrastructure for human-to-human and human-to-AI… thin 11
Massive (formerly Polygon.io) Polygon (Polygon.io, rebranded as Massive in early 2026) provides real-time and historical market data APIs across US stocks, options, indices, forex, cryptocurrencies, and futures. Coverage is delivered through REST endpoints and WebSocke… exemplar 7
Novu Novu is the open-source notification infrastructure for developers. A single REST API and workflow engine route a triggered event across in-app inbox, email, SMS, push, chat (Slack / Discord / MS Teams / WhatsApp) and custom channels — wit… exemplar 1
Kraken Kraken is one of the world's largest and longest-running cryptocurrency exchanges, founded in 2011 and headquartered in San Francisco. Kraken offers Spot and Futures trading, staking and yield through Kraken Earn, NFT marketplace access, O… exemplar 24
Gemini Trust Company Gemini Trust Company, LLC is a United States cryptocurrency exchange and custodian, founded in 2014 and headquartered in New York, regulated as a New York State Department of Financial Services trust company. It operates the Gemini Exchang… exemplar 2
Amazon API Gateway Amazon API Gateway is a fully managed service that makes it easy to create, publish, maintain, monitor, and secure APIs at any scale. It acts as the front door for applications to access backend services, supporting REST APIs, HTTP APIs, a… exemplar 13
Heroic Labs Heroic Labs is the company behind Nakama, a leading open-source game backend server providing a comprehensive REST, WebSocket, and gRPC API for building scalable multiplayer and social games. The platform delivers essential backend service… exemplar 4
Aedifion aedifion GmbH is a Cologne-based PropTech founded in 2017 that operates a vendor-neutral, patented cloud platform for the optimized operation of non-residential buildings. The platform ingests real-time operating data from all building tra… exemplar 2
Cumulocity Cumulocity is an enterprise AIoT (Artificial Intelligence of Things) platform that connects, manages, and analyzes industrial assets from cloud to edge. Founded inside Software AG and divested via a 2025 management buyout into an independe… strong 17
Dolby Dolby Laboratories is an audio and video technology company whose developer platform, Dolby OptiView, is the merged surface of the original dolby.io platform, THEO Technologies (THEOplayer, THEOlive, THEOads) and Millicast. It ships public… strong 13
Azure Service Bus Azure Service Bus is a fully managed enterprise message broker with message queues and publish-subscribe topics, providing reliable message delivery for decoupling applications and services in cloud and hybrid environments. strong 1
Red5 Red5 provides real-time streaming infrastructure for live video and audio delivery at scale. The Red5 Pro platform includes a media server, Stream Manager 2.0 for autoscaling cloud deployments, the Brew Mixer for composite stream productio… strong 3
SiftingIO Cross-asset market data APIs covering US equities, forex, cryptocurrency, DeFi/on-chain, commodities, and SEC/EDGAR fundamentals, aggregated across venues and normalized into one JSON schema so every asset class shares the same fields, aut… strong 1
MaiCoin MaiCoin is a Taiwan-based digital asset group that operates MAX (MaiCoin Assets eXchange), a regulated cryptocurrency exchange offering spot trading, margin borrowing (m-wallet), staking, and fiat TWD on/off-ramps. MAX publishes a public V… strong 1
AgentMail AgentMail is an API-first email platform that gives AI agents their own email inboxes to autonomously send, receive, reply to, and act on email. Unlike traditional transactional email APIs built for one-way notifications, AgentMail is desi… strong 1
ThingSpeak ThingSpeak is an IoT analytics platform from MathWorks that lets devices aggregate, visualize, and analyze live data streams in the cloud. Devices push telemetry to channels via a REST update endpoint or the `mqtt3.thingspeak.com` MQTT bro… strong 2
Odds API OpenAPI-first sports betting odds API (odds-api.net) providing bookmaker odds, odds comparison, arbitrage, positive EV, line movement, and racing/sports coverage via REST plus SSE and WebSocket streaming. Agent-native with an MCP server, l… strong 1
Amazon SNS Amazon Simple Notification Service (SNS) is a fully managed messaging service for both application-to-application (A2A) and application-to-person (A2P) communication. It enables pub/sub, SMS, email, and mobile push notifications. strong 1
Decart Decart is an AI research lab and API platform building real-time world models — foundation models that generate and transform video frame-by-frame as they are watched. Its Decart API Platform (platform.decart.ai) exposes the Lucy family of… strong 2
Lighter Lighter is a decentralized perpetual futures exchange built on zkLighter, a zero-knowledge rollup that produces verifiable proofs of order matching and liquidations while targeting the latency of a centralized venue. Traders register a Lig… developing 1
Qfex QFEX is the first 24/7 exchange built exclusively for US equities, commodities, and FX, offering high-leverage perpetual futures on traditional assets without a broker. Founded by former Tower Research and Citadel engineers who met studyin… developing 1
Binance.US Binance.US (operated by BAM Trading Services, Inc.) is a U.S.-regulated digital asset marketplace offering spot trading, staking, OTC and custodial services across 100+ cryptocurrencies. Its public developer program exposes a signed REST A… developing 3

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Real-TimeWebSocketWebRTCServer-Sent EventsMQTTPush NotificationsPub-SubPresenceSignalingTopic