WebSocket
Variants seen in the corpus:
WebSocketWebsocketwebsocket
Providers using this tag (72)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Exemplar 4 Complete, well-documented, and agent-ready
Strong 3 Solid coverage with minor gaps
Developing 25 Usable, with meaningful gaps to close
Thin 25 Limited public surface area
Emerging 15 Early or largely undocumented
APIs with this tag (237)
Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →
Exemplar 15 Complete, well-documented, and agent-ready
Upstox Developer APIThe Upstox Developer API is a free OAuth 2.0 REST and WebSocket suite for building trading and investment a...Kraken Futures WebSocket APIReal-time market data and private user feeds for Kraken Futures over WebSocket. Public feeds include trade,...Kraken Prime REST + WebSocket + FIX APIPrime brokerage API surface (REST, WebSocket, FIX) for institutional clients consolidating execution, custo...Kraken Spot WebSocket API v1 (Legacy)Legacy Kraken Spot WebSocket API. Continues to operate alongside v2 but v2 is the recommended path for new ...Kraken Spot WebSocket API v2Real-time market data and private user data over WebSocket v2 using subscribe/unsubscribe semantics. Public...Kraken WebSocket APIEndpoints that mint tokens for private WebSocket subscriptionsTwelve Data WebSocket Streaming APIReal-time price streaming over a persistent, bidirectional WebSocket at wss://ws.twelvedata.com/v1/quotes/p...0xArchive WebSocket APIReal-time subscriptions for supported Hyperliquid channels and historical replay for Hyperliquid and Lighte...Qlik Engine APIJSON-RPC WebSocket API for interacting with the Qlik Associative Engine, creating and manipulating apps, an...8x8 Event Streaming APIReal-time contact center event stream delivered over the Apache Pulsar WebSocket interface. Clients connect...OPERA Cloud Business Events Streaming APIPush delivery of OPERA Cloud Business Events as a GraphQL subscription over WebSocket. Each event carries t...Polygon WebSocket APIReal-time streaming WebSocket clusters per asset class (stocks/options/indices/forex/crypto). Subscribers a...Nakama APIThe Nakama API is the core REST and WebSocket API for Heroic Labs' open-source game backend server. It prov...fal Realtime APIWebSocket-based realtime inference for ultra-low latency interactive generative experiences such as LCM/SDX...Solana RPC WebSocket Subscriptions APIReal-time WebSocket subscription API for the Solana blockchain. Provides event-driven notifications for acc...
Strong 18 Solid coverage with minor gaps
Kensho Scribe Real Time APIReal-time streaming transcription over a WebSocket at wss://scribe.kensho.com/ws. Clients send an Authentic...Bullish WebSocket Anonymous Ticks APIAsyncAPI 3.0.0 document for simultaneous tick subscriptions across multiple Bullish markets over WebSocket.Bullish WebSocket Anonymous Trades APIAsyncAPI 3.0.0 document for batched anonymous trade subscriptions across multiple Bullish markets over WebS...Bullish WebSocket Auction Feed APIAsyncAPI 3.0.0 document for the real-time auction feed, delivering phase and order-imbalance data for Bulli...Bullish WebSocket Index Data APIAsyncAPI 3.0.0 document for streaming Bullish index prices, with the subscribed asset set controlled by sub...Bullish WebSocket Multi-Order Book APIAsyncAPI 3.0.0 document for simultaneous subscriptions to multiple L1 and L2 order books across different B...Bullish WebSocket Private Data APIAsyncAPI 3.0.0 document for the authenticated private stream — real-time orders, trades, asset accounts, tr...Amazon API Gateway Management APIAPI for directly managing runtime aspects of deployed APIs, including sending data to connected WebSocket c...Amazon API Gateway WebSocket APIBuild real-time two-way communication applications with WebSocket APIs.SiftingIO Live StreamWebSocket streaming API for live market data, described by an AsyncAPI 3.0 contract. Also offers a document...SiftingIO MCP ServerLOCALLY-RUN MCP server, not a hosted endpoint. The client launches it (`npx -y siftingio-mcp`, or the Pytho...GoldRush Hyperliquid WebSocket APIWebSocket channels for Hyperliquid markets including l2Book (wire-equal to the public feed), l2BookDiff (Go...Rhombus Console WebSocket APIReal-time organization change events delivered over a STOMP 1.2 session framed on a secure WebSocket. Clien...ThetaData Streaming WebSocket APIJSON WebSocket streaming of US stock trade/quote, options trade/quote, and index price streams, served loca...Liveblocks Realtime Client APIWebSocket-based client API exposed through Liveblocks client SDKs for React, JavaScript, Redux, Zustand, Vu...Lukka Market Data Streaming APIWebSocket streaming for executed trades, Level-1 order-book quotes, Lukka Prime pricing, Lukka Index valuat...Tradier Streaming APIThe Tradier Streaming API delivers real-time market and account events over HTTP and WebSocket. Quote, trad...Amberdata WebSocket Streaming APILow-latency real-time WebSocket streaming over a JSON-RPC 2.0 subscribe interface for spot trades and price...
Developing 91 Usable, with meaningful gaps to close
QFEX Market Data WebSocket (MDS)Multiplexed WebSocket gateway for all QFEX real-time market data streams: order book, trades, candles, BBO,...QFEX Trade WebSocketMultiplexed WebSocket gateway for QFEX order entry and account streams: add / modify / cancel orders, stop ...BuiltWith Live Feed APIReal-time WebSocket feed of technology detections as they happen across the web.Apstal Analytics APIDocumented REST surface for programmatic access to Apstal analytics: POST /api/v1/m for batched event inges...Sygnum Market Data APIMarket data service exposed as REST plus a streaming WebSocket channel, so partners can stream prices and m...Binance.US WebSocket APIThe Binance.US WebSocket API is a request/response API delivered over a persistent WebSocket connection at ...Binance.US WebSocket StreamsBinance.US WebSocket Streams deliver real-time market data and account events over persistent WebSocket con...Benzinga WebSocket Streaming APIReal-time WebSocket streams over wss://api.benzinga.com for news, earnings, analyst ratings, consensus rati...Blockchain.com Exchange WebSocket APIReal-time WebSocket gateway for the Blockchain.com Exchange. Anonymous channels stream heartbeat, L2/L3 ord...Blockchain.com Explorer WebSocket APILow-latency streaming socket channel providing notifications on new bitcoin blocks, unconfirmed transaction...Blockchain.com WebSocket APIsReal-time WebSocket APIs covering two distinct surfaces — the Bitcoin / blockchain.info explorer socket (un...CryptoCompare Streaming WebSocketSingle secure WebSocket endpoint multiplexing every subscription via tilde-delimited subscription strings (...Deutsche Börse Cloud Stream Market Data APICloud-delivered real-time market data streaming over WebSocket (host md.deutsche-boerse.com) with Protocol ...Anaconda Websocket APIThe websocket API from Anaconda — 3 operation(s) for websocket.LSEG WebSocket APIStandards-based WebSocket API for real-time pricing streaming using JSON message formats. Connects to Real-...Tensor WebSocket APISubscription-based realtime stream of Tensor marketplace events. Channels include `newTransaction` (every c...Twitch Chat APIManage chat settings, emotes, badges, and announcementsSpeechmatics Realtime Transcription APIWebSocket API for low-latency real-time streaming transcription supporting live audio input, speaker diariz...OpenSea Stream APIReal-time WebSocket event streaming for NFT marketplace activity per collection, including item listed, ite...Gladia Live (Real-time) APIWebSocket API for real-time live audio transcription with sub-second latency, supporting multi-language det...University of Amsterdam Web Socket APIThe WebSocket API from University of Amsterdam — 6 operation(s) for websocket.Neon Serverless DriverThe Neon Serverless Driver is a low-latency JavaScript and TypeScript driver that enables querying Neon Pos...Axway Amplify StreamsAxway Amplify Streams provides a real-time event streaming API platform enabling publishers to push data up...DeepL Voice APIThe DeepL Voice API provides real-time speech transcription and translation. A POST to /v3/voice/realtime i...tastytrade Account Streamer APIWebSocket-based account streaming that delivers real-time notifications for order fills, position changes, ...tastytrade DXLink Market Data Streaming APIReal-time market data streaming via DXLink, a WebSocket-based protocol backed by dxFeed. Clients fetch a qu...Gemini Live APILow-latency bidirectional streaming API enabling real-time voice and video interactions with Gemini models ...Triton One Whirligig WebSocketsWhirligig — Triton's enhanced WebSocket layer over Solana RPC. Adds the missing transactionSubscribe stream...Morningstar Streaming APIWebSocket-based real-time market data streaming with Level 1 quote and Level 2 market-by-price subscription...Nord Pool Intraday Trading APIWebSocket API for continuous intraday power trading - clients speak STOMP over secure WebSocket (port 443) ...StepFun Realtime APIBidirectional realtime voice over WebSocket (wss://api.stepfun.com/v1/realtime) with OpenAI Realtime-style ...AT Protocol Firehose (Event Stream)Public WebSocket event stream providing real-time access to all public activity on the AT Protocol network,...AT Protocol Relay & FirehoseThe Relay aggregates the com.atproto.sync.subscribeRepos firehose across PDS hosts and re-broadcasts the co...HiveMQ MQTT over WebSocketMQTT 3.x and MQTT 5 messaging endpoints exposed over WebSocket for browser and edge clients to publish and ...FDC3 Desktop Agent BridgingFDC3 Desktop Agent Bridging (DAB) is a wire protocol that enables multiple Desktop Agent implementations to...Deribit WebSocket APIJSON-RPC over WebSocket interface for real-time bidirectional communication with the Deribit exchange. Reco...Neuphonic TTS WebSocket APIWebSocket endpoint for continuous, low-latency text-to-speech streaming. Enables real-time voice synthesis ...Juniper Mist WebSocket Streaming APIMist exposes a WebSocket channel for real-time event subscriptions including device events, location update...P4 Plan (Hansoft) Web APIWeb service exposing a limited set of data and tasks over the DDP protocol via a WebSocket connection.Sanas Stream APIReal-time speech-to-speech translation over a single persistent WebSocket connection, supporting consecutiv...Refinitiv Real-Time WebSocket APILow-latency streaming API for real-time market data using WebSocket connections. It supports the Open Messa...Discord Gateway APIThe Gateway API from Discord — 2 operation(s) for gateway.Discord Voice APIThe Voice API from Discord — 1 operation(s) for voice.Infoway WebSocket Streaming APIPersistent WebSocket connection for real-time trades, order-book depth, candlesticks and multilingual news....Jito Streaming SurfacesReal-time streaming surfaces from Jito infrastructure — the wss tip_stream for continuous bundle-tip percen...Polymarket WebSocketReal-time streaming feed for order book updates, trades, and market events on the Polymarket CLOB - used by...Sense Realtime APIThe Sense Realtime API delivers live electricity usage data via a WebSocket connection, streaming second-by...MEXC Futures WebSocket APIThe MEXC Futures WebSocket API streams real-time derivatives market data and account events over persistent...MEXC Spot WebSocket StreamsThe MEXC Spot WebSocket Streams deliver real-time market data and user account updates via persistent WebSo...Spring WebFlux WebSocketReactive WebSocket support for full-duplex, bidirectional communication in WebFlux applications. Provides W...Cartesia STT WebSocket APIRealtime transcription over WebSocket at wss://api.cartesia.ai/stt/websocket. Clients stream raw binary aud...Cartesia TTS WebSocket APIBidirectional, multiplexed WebSocket at wss://api.cartesia.ai/tts/websocket for realtime speech generation....LMNT Speech Sessions APIWebSocket-based real-time speech generation API for streaming LLM text output to synthesized audio with res...Convex Sync ProtocolThe Convex Sync Protocol is the bidirectional WebSocket protocol spoken between Convex client SDKs and the ...dxFeed dxLink WebSocket APIdxLink is dxFeed's WebSocket protocol for real-time market data streaming with multiplexed virtual channels...WellnessLiving WebSocket APIThe WebSocket API from WellnessLiving — 1 operation(s) for websocket.Nakama Realtime Socket APIPersistent WebSocket connection carrying realtime features - status presence, realtime chat channels, relay...Aisera Conversation & Workflows API and WebSocketBuild custom conversational interfaces for AiseraGPT applications — decoration, NLP/NLU processing, slot fi...Pred WebSocket APIPRED uses [Ably](https://ably.com/) for real-time WebSocket data. Use Ably's token auth with `POST /api/v1/...LBank WebSocket Account and Order APIAuthenticated WebSocket API for receiving real-time account balance and order status updates from LBank. Cl...LBank WebSocket Market Data APIReal-time WebSocket API for streaming live market data from LBank. Clients can subscribe to K-line (candles...PartyKit Deployed Party (HTTP / WebSocket)Public HTTP and WebSocket interface for a deployed PartyKit project at project.user.partykit.dev. Each part...Reclaim.ai websocket APIThe websocket API from Reclaim.ai — 7 operation(s) for websocket.ZenRows Scraping BrowserCloud headless browser exposed over WebSocket at wss://browser.zenrows.com?apikey=KEY, compatible with Play...Portainer websocket APICreate exec sessions using websocketszkSync Era WebSocketWebSocket variant of the zkSync Era JSON-RPC endpoint for real-time eth_* subscriptions (newHeads, logs, pe...Mudrex Market Data APIPublic, unauthenticated market-data surface for Mudrex linear perpetual futures. Over REST it returns bulk ...Legend WebSocket APILegend's Hyperliquid-compatible WebSocket at wss://api.legend.trade/ws, using subscription-based messaging....Supabase Realtime APIThe Supabase Realtime API provides WebSocket-based subscriptions for real-time data changes from PostgreSQL...Jupyter Kernel Messaging ProtocolWebSocket-based messaging protocol for communication between Jupyter clients and computational kernels. Sup...InstantDB Realtime Sync APIThe realtime sync transport - a persistent WebSocket at wss://api.instantdb.com/runtime/session over which ...Nabla Copilot User APIThe User API enables client-side applications to act on behalf of an individual user by exchanging server-i...Nabla Core APIThe Nabla Core API transcribes medical encounters, generates structured clinical notes (for example SOAP), ...Pintu Pro Partner APIPintu Pro's institutional/partner trading API. A unified message format is used over both an HTTP endpoint ...Plivo Audio Stream APIThe Plivo Audio Stream API attaches a real-time WebSocket audio stream to a live call, enabling AI voice ag...Trading Economics Streaming APIPersistent WebSocket connection at wss://stream.tradingeconomics.com delivering live market quote ticks by ...PandaScore Live Data APIReal-time in-game state, frames, and event timelines streamed over WebSocket for supported esports titles. ...Cryptomus Exchange and Market Data APIREST and WebSocket API for accessing real-time cryptocurrency exchange rates, order books, tickers, trade h...Quix Streaming Reader API (Real-time)Subscribe to live parameter data, events, definitions, active streams, topic metrics, and raw packages from...Binance Spot WebSocket APIThe Binance Spot WebSocket API provides an alternative way to access spot trading functionality through per...Binance Spot WebSocket StreamsBinance Spot WebSocket Streams deliver real-time market data updates via persistent WebSocket connections. ...Oddpool WebSocket FeedsSingle-connection WebSocket streaming real-time, normalized cross-venue prediction market data (dist, book,...Papercups Realtime Chat API (WebSocket / Phoenix Channels)Bidirectional realtime live chat over Phoenix WebSocket channels. Clients join conversation, conversation-l...SEC API Filing Stream APIReal-time, push-based WebSocket feed of newly published SEC EDGAR filings. Connect to wss://stream.sec-api....Upbit WebSocket APIThe Upbit WebSocket API delivers real-time streaming data for market and account events. Public streams inc...Bitnomial Market Data WebSocket APIReal-time WebSocket market-data feed delivering trade, order book, block trade, and market status messages ...Circle Realtime WebSocket APIBeta ActionCable (Rails) WebSocket surface for realtime chat and notifications, connected at wss://app.circ...TzKT WebSocket APIThe TzKT WebSocket API uses SignalR to deliver real-time push notifications to subscribed clients. Channels...Tendermint Websocket APISubscribe/unsubscribe are reserved for websocket events.Highrise Bot APIWebSocket API for building and running programmable bots inside Highrise rooms. Bots receive a stream of ro...Railway Logs APIGraphQL log surface for builds, deployments, environments, and HTTP traffic. Available both as point-in-tim...
Thin 85 Limited public surface area
Transports (WebRTC/WebSocket)Realtime media transport layer of the framework. Bidirectional audio, video, and data flow over Daily WebRT...1Forge Forex StreamWebSocket stream that delivers real-time bid/ask updates for subscribed forex and cryptocurrency pairs. Str...Bitstamp WebSocket APIReal-time WebSocket API providing live market data streams including order book updates, live trades, ticke...CometChat Realtime & Client SDKClient SDKs (JavaScript, React, React Native, Android, iOS, Flutter, Ionic) connect over a managed WebSocke...Korbit Open API v2 WebSocketWebSocket streaming API for the Korbit exchange. Public channels stream ticker, orderbook and trade market ...Wazo Websocket Event Stream (wazo-websocketd)WebSocket gateway onto the Wazo internal event bus. An authenticated client subscribes to named platform ev...Fortnox Topics WebSocket APIDuplex WebSocket stream at wss://ws.fortnox.se/topics-v1 that pushes minimal change-notification events acr...Qlik Sense Engine JSON APIWebSocket protocol API using JSON-RPC for interacting with the Qlik Associative Engine.AISStream AIS Stream APIReal-time global AIS vessel-tracking stream delivered over a single WebSocket at "wss://stream.aisstream.io...Hyperliquid WebSocket APIReal-time WebSocket feed delivering order-book deltas, trades, candles, BBO, user fills, user funding, user...Syndica ChainStream APIChainStream is Syndica's real-time Solana data streaming API. It consolidates updates from multiple validat...Syndica Solana RPC (WebSocket) APIStandard Solana RPC PubSub WebSocket service supporting accountSubscribe, programSubscribe, signatureSubscr...Kalshi AsyncAPI SpecificationMachine-readable AsyncAPI description of the Kalshi WebSocket streaming API. Suitable for generating async ...Kalshi WebSocket Streaming APIReal-time streaming feed for market data, order book updates, fills, and portfolio events on Kalshi. Docume...OWASP ZAP websocket APIThe websocket API from OWASP ZAP — 6 operation(s) for websocket.Layercode Realtime Voice APIBidirectional realtime WebSocket transport that streams base64 PCM microphone audio from the browser to Lay...Vocode Realtime Streaming ConversationReal-time, bidirectional streaming conversation pipeline (StreamingConversation) in the open-source library...SpacetimeDB HTTP APIThe SpacetimeDB HTTP API lets clients and tools interact with SpacetimeDB databases: publish and delete dat...Foundation Event Replay APIWebSocket streaming API onto the Foundation event bus. Two channels are documented: a real-time event strea...Qlik Engine JSON-RPC APIThe JSON-RPC API over WebSocket that enables interaction with the Qlik Associative Engine for Qlik Sense ap...Gate WebSocket API v4Real-time WebSocket streams for market data (order books, trades, tickers, candlesticks) and private channe...Bitso WebSocket APIReal-time streaming channels for trades, order-book diffs, and full order-book snapshots. Used by trading c...Restream Chat APIWebSocket API for accessing and managing Restream Chat. Receive real-time chat messages from all connected ...Restream Streaming Updates APIWebSocket API for real-time streaming status updates. Connect to wss://streaming.api.restream.io/ws with an...Mattermost WebSocket APIReal-time WebSocket event stream for Mattermost v4. Clients connect to /api/v4/websocket, authenticate via ...WazirX WebSocket APIEndpoints for WebSocket authentication token generationTD Ameritrade Streaming Market Data APIProvides a WebSocket-based streaming API that delivers up-to-the-second market data including real-time Lev...Courier Inbox Real-Time APIWebSocket service that delivers Inbox messages and message-state events (read, unread, opened, archived, cl...PTC ThingWorx WebSocket/AlwaysOn APIPTC ThingWorx AlwaysOn WebSocket API enables persistent bidirectional connections for industrial edge devic...Photon Realtime Transport ProtocolThe core Photon protocol - NOT a REST or JSON API. Clients connect through a Name Server to a Master Server...PowerTrade WebSocket FeedsReal-time WebSocket market-data feeds (reference data, top-of-book, order books, trades, index and settleme...Bithumb WebSocket APIReal-time WebSocket API for streaming market data including tickers, order books, and trade executions, as ...QuickNode Core RPC APIMulti-chain JSON-RPC, REST, and gRPC endpoints across 77+ blockchains (Ethereum, Solana, Polygon, Arbitrum,...Argmax Local ServerA local transcription server for macOS that is API-compatible with the Deepgram Speech-to-Text (Live) API, ...Bitquery Streaming SubscriptionsGraphQL subscriptions over WebSocket for real-time blockchain data - live DEX trades, transfers, pending tr...Sui Websocket APIThe Websocket API from Sui — 2 operation(s) for websocket.eToro Market Data APIProvides REST and WebSocket access to real-time and historical market data for all asset classes available ...Urban Sky SDK (Real-time Balloon Telemetry)Real-time balloon telemetry feed delivered over WebSocket via the Urban Sky SDK (JavaScript and Python, dis...Capital.com WebSocket APIThe Capital.com WebSocket API streams real-time market data, supporting up to 40 concurrent instruments and...Qlik Engine JSON APIWebSocket-based JSON-RPC API for direct interaction with the Qlik Associative Engine.Helius Solana RPCSolana JSON-RPC and WebSocket endpoints with enhanced WebSockets, archival data, and staked connections.LiteLLM Realtime APIProvides /realtime WebSocket endpoints for real-time model interactions with load balancing and guardrails ...Respeecher Space Real-Time TTS APILow-latency real-time text-to-speech that begins streaming audio in under 200ms via three transports - one-...Aevo Exchange WebSocket APIReal-time WebSocket API for Aevo exchange providing low-latency streams for orderbook updates, trade feeds,...FirecampFirecamp is an open-source API development platform for designing, testing, and documenting REST, GraphQL, ...HTX WebSocket APIThe HTX WebSocket API provides a two-way real-time channel for subscribing to market data (klines, market d...WalletConnect Relay (SDK-mediated)WalletConnect v2 relay network for end-to-end encrypted JSON-RPC pairing between dApps and wallets. Accesse...LiveChat Webhooks and RTM APIAsynchronous event surfaces for LiveChat. HTTP webhooks registered through the Configuration API and the Ag...LiveKit Signaling Protocol (WebSocket)Bi-directional WebSocket signaling protocol used by LiveKit clients to coordinate WebRTC sessions with the ...XRPL WebSocket API (Mainnet)WebSocket interface to the XRP Ledger mainnet supporting all JSON-RPC methods plus real-time subscriptions ...XRPL WebSocket API (Testnet)WebSocket interface to the XRP Ledger Altnet testnet for development and testing. Supports real-time subscr...Mantle WebSocket (Mainnet)WebSocket endpoint for real-time JSON-RPC subscriptions on Mantle mainnet - new blocks, new pending transac...Infura JSON-RPC APIMulti-chain JSON-RPC over HTTPS and WebSockets across 23+ networks (Ethereum, Linea, Polygon, Arbitrum, Opt...AgentOS Runtime APIPre-built FastAPI runtime that exposes 50+ REST, SSE, and WebSocket endpoints for running agents, teams, an...Apache TinkerPop Gremlin Server APIThe Gremlin Server provides WebSocket and HTTP endpoints for submitting Gremlin traversals to a remote grap...Vert.x WebA set of building blocks for building web applications and RESTful HTTP microservices with Vert.x. Provides...Lightpanda CDP WebSocket InterfaceLightpanda's primary programmable interface. The browser runs as a CDP server (`lightpanda serve`) and expo...Lightpanda CloudManaged, hosted CDP browser endpoints reached over secure WebSocket (e.g. `wss://euwest.cloud.lightpanda.io...Matrixport WebSocket APIThe WebSocket API from Matrixport — 1 operation(s) for websocket.ACTIV Web One API (AtlasFeed)WebSocket-based (WebAssembly) JavaScript/TypeScript market data API for browser and Node.js, installed as n...Nostr Protocol (NIP-01)NIP-01 defines the core Nostr protocol: event format (id, pubkey, created_at, kind, tags, content, sig), cl...Nostr Relay WebSocket InterfaceA Nostr relay is a WebSocket server that accepts signed events, stores them subject to its own policy, and ...Rev AI Streaming Speech-to-Text APIReal-time speech transcription via WebSocket connections supporting up to 10 concurrent streams with a 3-ho...One Trading WebSocket Streams APIReal-time WebSocket API for market data (order book, price ticks, book ticker) and, after authenticating, p...Pushover Open Client APIReal-time client API for Pushover. Combines a WebSocket channel at wss://client.pushover.net/push that stre...Alchemy Node API (JSON-RPC)Multi-chain JSON-RPC over HTTPS and WebSockets covering standard eth_*, solana, and other chain methods, pl...Synthetix WebSocket Info APIPublic WebSocket API for real-time Synthetix market data subscriptions including live market prices, candle...Synthetix WebSocket Trade APIAuthenticated WebSocket API for real-time trading operations and account event streaming on Synthetix. Supp...Huly Platform SDKThe @hcengineering/api-client Node.js package provides typed programmatic access to the Huly Platform. It e...Morgan Stanley API Platform (WebSocket Streaming)Alongside its REST APIs, the Morgan Stanley API Platform exposes streaming WebSocket APIs for onboarded ins...Whop Realtime WebSocket APIBidirectional realtime WebSocket for Whop apps - custom app messages and chat/feed updates - connected and ...Sei Websocket APISubscribe/unsubscribe are reserved for websocket events.Perp V1 Market Maker APISigned, high-performance interface for connecting trading bots to the perp.com V1 matching engine: a privat...Litecoin Space WebSocket APIA real-time WebSocket API provided by Litecoin Space (litecoinspace.org) for subscribing to live Litecoin n...AVEVA PI System REST APIThe AVEVA PI System REST API (PI Web API) provides RESTful HTTP access to time- series sensor data, asset m...Rime TTS APIRealtime text-to-speech API supporting streaming HTTP, WebSocket, and SSE delivery for Arcana and Mist mode...BitMart Futures WebSocket APIThe BitMart Futures WebSocket API streams real-time derivatives market data and account updates through per...BitMart Spot WebSocket APIThe BitMart Spot WebSocket API delivers real-time streaming market data and private account updates via per...Arkham Entity Intelligence APIREST and WebSocket API for programmatic access to Arkham's entity dataset - resolve addresses to entities, ...Arkham Exchange WebSocket APIWebSocket API for Arkham Exchange streaming market data and private account events - real-time ticker, dept...Ultraleap Tracking WebSocketAn open-source WebSocket server from Ultraleap that restores the LeapJS-compatible websocket surface remove...Exotel AgentStream Voice Streaming APIDocumented WebSocket (wss://) voice-streaming API. When a call reaches a Voicebot or Stream applet, Exotel ...CoinEx WebSocket API v2 - FuturesReal-time WebSocket API for CoinEx futures and perpetual contract markets. Supports streaming subscriptions...CoinEx WebSocket API v2 - SpotReal-time WebSocket API for CoinEx spot markets. Supports streaming subscriptions for market depth, trade f...WhistleWhistle is a cross-platform HTTP, HTTPS, HTTP/2, WebSocket, and TCP debugging proxy tool. It lets developer...
Emerging 25 Early or largely undocumented
CoinAPI EMS Trading APICoinAPI's Execution Management System (EMS) is a unified, multi-exchange crypto trading API that lets insti...CoinAPI Market Data APINormalized cryptocurrency market data covering more than 350 exchanges and 28,000+ assets. Provides trades,...Lyra WebSocket APIWebSocket API for real-time streaming of market data, order book updates, ticker subscriptions, and private...CentrifugoAn open-source language-agnostic realtime messaging server providing WebSocket, SSE, HTTP streaming, and We...GraphQL SubscriptionsA GraphQL operation type that delivers realtime updates to clients, typically carried over WebSocket using ...Phoenix ChannelsThe realtime layer of the Elixir Phoenix Framework — soft-realtime channels, presence, and pub/sub built on...Socket.IOA widely deployed open-source realtime engine for Node.js (with clients across JavaScript, Java, Swift, Kot...WebSocketA full-duplex communication protocol over a single TCP connection, standardized by the IETF as RFC 6455 and...Pendle Real-Time Feeds (Socket.IO)Real-time data feeds delivered over Socket.IO from `https://api-v2.pendle.finance/pendle-v2`. Clients conne...ACTIV OnePlatform Web API (One API)WebSocket/WebAssembly JavaScript API for the ACTIV OnePlatform (Options Atlas), delivering real-time stream...Bitget WebSocket APIReal-time WebSocket API providing public and private channels for market data (tickers, candles, order book...RestfoxRestfox is a lightweight, offline-first web HTTP client for testing REST APIs, similar to Postman but brows...QuoteMedia Streaming Data Feed APIEnterprise tick-by-tick streaming feed for real-time or delayed Level 1 and Level 2 market data, normalized...Mock Service WorkerMock Service Worker (MSW) is an open-source library for mocking REST, GraphQL, WebSocket, and Server-Sent E...Dash Insight REST APIOpen-source REST and WebSocket API for querying the Dash Core (layer 1) blockchain. Provides endpoints for ...CoinDCX Streaming Socket.IO APIReal-time Socket.IO streaming at stream.coindcx.com for public spot and futures market data (orderbook dept...tldraw Sync (Multiplayer)tldraw provides a multiplayer sync layer (WebSocket-based) that customers can self-host or use through tldr...Abios Atlas APIAtlas is the Abios REST and WebSocket data API delivering fixtures, live match state, historical stats, pla...Netflix Zuul Push MessagingZuul Push Messaging enables server-to-client push communications over WebSockets and Server Sent Events (SS...Flowdesk Platform ConnectFlowdesk Platform Connect is the developer API for programmatic OTC spot trading. It offers a REST interfac...Qlik Engine APIJSON-RPC API for interacting with the Qlik Associative Engine.Mango v4 Fills FeedLow-latency WebSocket feed (service-mango-fills) that parses Mango V4 Perp and Openbook event queues and em...Mango v4 Orderbook FeedLow-latency WebSocket feed (service-mango-orderbook) that parses Mango V4 Perp and Openbook spot bookside a...Soketi Pusher-Compatible APIImplements the Pusher protocol (channels, private channels, presence channels, encrypted channels) for drop...Jakarta WebSocketJakarta WebSocket defines a standard API for creating server and client endpoints that communicate using th...
Minimal 3 Almost no public developer surface
Soccer APIThe advertised live football data API — REST plus a WebSocket stream — covering competitions, fixtures, liv...MayStreet High Performance Query (HPQ) APILow-latency, near-time market data query API delivered as a streaming WebSockets service so clients can pro...Parallel Finance JSON-RPC (polkadot.js)Substrate/Polkadot JSON-RPC interface to the Parallel Finance parachain, accessed over WebSocket with the p...
Companies reaching this through an API (152)
These companies publish an API, specification or operation carrying “WebSocket” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.
1Forge
8x8
Aisera
Alchemy
Allo-Media
Amberdata
Anaconda
Apache TinkerPop
Apstal
Argmax
Arkham Intelligence
AT Protocol
AVEVA
Axway
Benzinga
Binance
BitMart
Bitnomial
Bitquery
Bitso
Blockchain.com
BuiltWith
Bullish
Circle
CoinDCX
CometChat
Convex
Courier
Covalent
CryptoCompare
Cryptomus
Dash
DeepL
Deutsche Börse
Discord
dxFeed
eToro
Exotel
fal
FDC3
Fortnox
Gemini
Hansoft
Helius
Highrise
Huly
Hyperliquid
Infura
InstantDB
Jakarta EE
Show all 152 companies ↓
Jito Labs
Juniper Mist AI
Jupyter Notebook
Kalshi
Layercode
LBank
Leap Motion
Litecoin
LiteLLM
Liveblocks
LiveChat
LiveKit
LMNT
Lukka
Lyra
Mantle Network
Mattermost
MayStreet
MEXC
Morgan Stanley
Morningstar
Mudrex
Nabla
Nakama
Neon
Netflix Zuul
Nord Pool
OpenSea
Options Technology
Oracle Hospitality
OWASP ZAP
Papercups
Parallel Finance
PartyKit
Pendle Finance
Perp
Phidata / Agno
Pipecat
Plivo
Polygon
Polymarket
Portainer
Pred
Proofpoint
PTC ThingWorx
Pushover
Qlik
Qlik Cloud
Qlik Mashups
Qlik Sense APIs
Qlik Sense Enterprise
QuickNode
Quix
QuoteMedia
Railway
Reclaim.ai
Refinitiv
Refinitiv Eikon
Reown
Respeecher
Restream
Rev AI
Rhombus Systems
Ribbon Finance
Rime
S&P Global
SEC API
Sei
Sense
Soccer API
Soketi
Solana
Spring WebFlux
StepFun
Sui
Supabase
Sygnum
Syndica
Synthetix
TD Ameritrade
Tendermint
Tensor
The Mobility House
ThetaData
tldraw
Tradier
Trading Economics
Triton One
Twelve Data
Twitch
University of Amsterdam
Upstox
Urban Sky
Vert.x
Virtualitics
Vocode
Wazo
WellnessLiving
Whop
XRP Ledger
ZenRows
zkSync
Score breakdown
Frequency
67.6
log-scaled weighted occurrences
Breadth
2.0
spread across providers
Quality lift
43.6
mean composite of providers using it
Cohesion
23.6
strength of nearest seed neighbor
Related tags
Real-Time 113 co-occurrences
Streaming 103 co-occurrences
Market Data 76 co-occurrences
Trading 62 co-occurrences
Exchange 28 co-occurrences
Cryptocurrency 51 co-occurrences
Futures 19 co-occurrences
Options 21 co-occurrences
Where this tag comes from
Provider tag73
Api tag246
Openapi tag12
Openapi op tag32
Cohort brief
Auto-generatedThe 72 providers in the APIs.io catalog tagged WebSocket, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
Providers
72
all scored
Mean Kin Score
38.4
+14.5 vs catalog 23.9
Mean Agent Readiness
21.5
+9.5 vs catalog 12
Spread
11.9–74.5
median 38.1 · σ 13.8
How the 72 split by band
Exemplar 4Strong 3Developing 25Thin 25Emerging 15Minimal 0
Facet averages, against the whole catalog
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Contract Quality | 41.1 | 19.8 | +21.3 | 72 |
| Developer Ergonomics | 40.1 | 23.4 | +16.7 | 72 |
| Operational Transparency | 28.2 | 13.9 | +14.3 | 72 |
| Discoverability | 72.1 | 61.2 | +10.9 | 72 |
| Access Clarity | 36.4 | 26.5 | +9.9 | 72 |
| Contract Governance | 11.3 | 6.4 | +4.9 | 72 |
A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.
What this cohort publishes
| Artifact | This cohort | Catalog | Difference |
|---|---|---|---|
| MCP server (any) | 11% | 10% | +1 |
| MCP server (first-party) | 15% | 13% | +2 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 3% | 11% | -8 |
| Security | 97% | 96% | +1 |
| Arazzo workflows | 6% | 2% | +4 |
| Governance rules | 44% | 14% | +30 |
mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.
Top by Kin Score
- 1 Kraken 74.5
- 2 0xArchive 72.7
- 3 Postman 72.5
- 4 Heroic Labs 67.9
- 5 Amazon API Gateway 64.9
- 6 SiftingIO 63.9
- 7 MaiCoin 60.4
- 8 Qfex 54
- 9 Binance.US 52.6
- 10 Stream 50.9
All 72 members of this roster resolve to a scored provider in
the catalog.Generated from the catalog build of
16 September 2026, across 27514
providers, using the same computation served by the
APIs.io cohort API. Briefs are published for rosters of
5 or more scored providers; below that a distribution is not meaningful.
Work with this as data
Every tag here is available over the APIs.io API and to AI agents over MCP.