WebSocket
Variants seen in the corpus:
WebSocketsWebSocket
Providers using this tag (105)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Exemplar 4 Complete, well-documented, and agent-ready
Strong 9 Solid coverage with minor gaps
Developing 27 Usable, with meaningful gaps to close
Thin 39 Limited public surface area
OddpooliTickPusherDeribitVideoSDKPhemexUpbitBitstampMatrixportFirecampHoppscotchWazirXAISStreamBitrueGate.ioPintuForumHibachiCartesiaClockwork LabsRho ProtocolKorbitPartyKitNeuphonicPTC ThingWorxAcres ManufacturingLATOKENRiver MarketsBloFinPowerTradePandaScoreLedgerX (MIAX Derivatives Exchange)FinlightOne TradingCapital.com Public APIPubNubBlue Square Group LimitedTezosNDAX
APIs with this tag (274)
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 9 Complete, well-documented, and agent-ready
Upstox Websocket APIThe Websocket API from Upstox — 4 operation(s) for websocket.OPERA Cloud Business Events Streaming APIPush delivery of OPERA Cloud Business Events as a GraphQL subscription over WebSocket. Each event carries t...0xArchive WebSocket APIReal-time subscriptions for supported Hyperliquid channels and historical replay for Hyperliquid and Lighte...8x8 Event Streaming APIReal-time contact center event stream delivered over the Apache Pulsar WebSocket interface. Clients connect...Qlik Engine APIJSON-RPC WebSocket API for interacting with the Qlik Associative Engine, creating and manipulating apps, an...Qlik Sense Engine APIWebSocket-based API for interacting with the Qlik Associative Engine, including data modeling, selections, ...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.Gemini WebSocket APIThe production Gemini WebSocket API at wss://ws.gemini.com: request/response methods, market data streams (...
Strong 34 Solid coverage with minor gaps
fal Realtime APIWebSocket-based realtime inference for ultra-low latency interactive generative experiences such as LCM/SDX...Polygon WebSocket APIReal-time streaming WebSocket clusters per asset class (stocks/options/indices/forex/crypto). Subscribers 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 subscriptionsRhombus Console WebSocket APIReal-time organization change events delivered over a STOMP 1.2 session framed on a secure WebSocket. Clien...Kensho Scribe Real Time APIReal-time streaming transcription over a WebSocket at wss://scribe.kensho.com/ws. Clients send an Authentic...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...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...Twelve Data WebSocket Streaming APIReal-time price streaming over a persistent, bidirectional WebSocket at wss://ws.twelvedata.com/v1/quotes/p...Anaconda Websocket APIThe websocket API from Anaconda — 3 operation(s) for websocket.ThetaData Streaming WebSocket APIJSON WebSocket streaming of US stock trade/quote, options trade/quote, and index price streams, served loca...Nakama APIThe Nakama API is the core REST and WebSocket API for Heroic Labs' open-source game backend server. It prov...Ultravioleta DAO WebSocket APIThe websocket API from Ultravioleta DAO — 2 operation(s) for websocket.Solana RPC WebSocket Subscriptions APIReal-time WebSocket subscription API for the Solana blockchain. Provides event-driven notifications for acc...MAX Exchange WebSocket APIReal-time streaming service for MAX Exchange. Public channels cover order book (book), trade, ticker, kline...Apstal Analytics APIDocumented REST surface for programmatic access to Apstal analytics: POST /api/v1/m for batched event inges...Blazing Bullet Private Limited WebSocket APIThe WebSocket API from Blazing Bullet Private Limited — 6 operation(s) for websocket.Paradex WebSocket APIJSON-RPC over WebSocket channels for real-time market data, order book, trades, fills, orders, positions an...EODHD WebSockets Real-Time APIStreams real-time trade and quote updates over WebSockets for US stocks, forex, and cryptocurrencies, allow...Liveblocks Realtime Client APIWebSocket-based client API exposed through Liveblocks client SDKs for React, JavaScript, Redux, Zustand, Vu...Paymentsense Connect WebSockets APIDocumented WebSockets interface for the Connect platform, offering an event-driven alternative to the REST ...GoldRush Hyperliquid WebSocket APIWebSocket channels for Hyperliquid markets including l2Book (wire-equal to the public feed), l2BookDiff (Go...APIClaw WebSocket APIThe WebSocket API from APIClaw — 6 operation(s) for websocket.Axway Amplify StreamsAxway Amplify Streams provides a real-time event streaming API platform enabling publishers to push data up...StepFun Realtime APIBidirectional realtime voice over WebSocket (wss://api.stepfun.com/v1/realtime) with OpenAI Realtime-style ...
Developing 66 Usable, with meaningful gaps to close
zerohash Private WebSocket APIAuthenticated WebSocket feed delivering a full account-balance snapshot on subscribe followed by incrementa...BuiltWith Live Feed APIReal-time WebSocket feed of technology detections as they happen across the web.Gemini Live APILow-latency real-time voice and video interactions with Gemini using WebSockets for streaming multimodal in...Lukka Market Data Streaming APIWebSocket streaming for executed trades, Level-1 order-book quotes, Lukka Prime pricing, Lukka Index valuat...Open Poker WebSocket Game APIWebSocket gameplay protocol (V2) at wss://openpoker.ai/ws. Client sends join_lobby, action, rebuy, leave_ta...Portainer Websocket APICreate exec sessions using websocketsTrigger.dev Realtime APIThe Trigger.dev Realtime API streams live run state and typed stream data to backend and frontend clients. ...DeepL Voice APIThe DeepL Voice API provides real-time speech transcription and translation. A POST to /v3/voice/realtime i...WhiteBIT WebSocket APIReal-time market streams and private account streams over WebSocket (wss://api.whitebit.com/ws).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 ...Neon Serverless DriverThe Neon Serverless Driver is a low-latency JavaScript and TypeScript driver that enables querying Neon Pos...Tradier Streaming APIThe Tradier Streaming API delivers real-time market and account events over HTTP and WebSocket. Quote, trad...Allo-Media Stream API for HumansReal-time transcription of live human-to-human conversations over a WebSocket (Phoenix Channels). A client ...Twitch Chat APIManage chat settings, emotes, badges, and announcementsBenzinga WebSocket Streaming APIReal-time WebSocket streams over wss://api.benzinga.com for news, earnings, analyst ratings, consensus rati...Gloria WebSocket APIReal-time news feed via WebSocketBinance.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...Sygnum Market Data APIMarket data service exposed as REST plus a streaming WebSocket channel, so partners can stream prices and m...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...Deutsche Börse Cloud Stream Market Data APICloud-delivered real-time market data streaming over WebSocket (host md.deutsche-boerse.com) with Protocol ...HiveMQ MQTT over WebSocketMQTT 3.x and MQTT 5 messaging endpoints exposed over WebSocket for browser and edge clients to publish and ...Azure Web PubSub Client and Upstream EventsAsyncAPI 2.6 description of the Azure Web PubSub client WebSocket subprotocols (json.webpubsub.azure.v1 and...LSEG WebSocket APIStandards-based WebSocket API for real-time pricing streaming using JSON message formats. Connects to Real-...May Mobility Fleet Realtime APIA WebSocket streaming API that delivers live May Mobility vehicle data in two modes. Telemetry mode streams...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...Discord Gateway APIThe Discord Gateway API provides persistent, stateful WebSocket connections between your client and Discord...Discord Voice APIThe Discord Voice API provides the protocol for establishing and managing voice connections between clients...Supra Web Socket APIBlock-streaming WebSocket subscription ApiBright Data Scraping Browser (Browser API) CDP WebSocketBright Data's Scraping Browser / Browser API: a cloud headless-browser fleet that speaks the Chrome DevTool...Juniper Mist WebSocket Streaming APIMist exposes a WebSocket channel for real-time event subscriptions including device events, location update...Highrise Bot APIWebSocket API for building and running programmable bots inside Highrise rooms. Bots receive a stream of ro...Infoway WebSocket Streaming APIPersistent WebSocket connection for real-time trades, order-book depth, candlesticks and multilingual news....Convex Sync ProtocolThe Convex Sync Protocol is the bidirectional WebSocket protocol spoken between Convex client SDKs and the ...Refinitiv Real-Time WebSocket APILow-latency streaming API for real-time market data using WebSocket connections. It supports the Open Messa...Aisera Conversation & Workflows API and WebSocketBuild custom conversational interfaces for AiseraGPT applications — decoration, NLP/NLU processing, slot fi...Morningstar Streaming APIWebSocket-based real-time market data streaming with Level 1 quote and Level 2 market-by-price subscription...HTX WebSocket APIThe HTX WebSocket API provides a two-way real-time channel for subscribing to market data (klines, market d...Amberdata WebSocket Streaming APILow-latency real-time WebSocket streaming over a JSON-RPC 2.0 subscribe interface for spot trades and price...Qlik Engine JSON-RPC APIThe JSON-RPC API over WebSocket that enables interaction with the Qlik Associative Engine for Qlik Sense ap...Reclaim.ai Websocket APIThe websocket API from Reclaim.ai — 7 operation(s) for websocket.Supabase Realtime APIThe Supabase Realtime API provides WebSocket-based subscriptions for real-time data changes from PostgreSQL...ChargePilot VDV 463 InterfaceTwo-way WebSocket-Secure interface between ChargePilot (acting as the Charging Management System, CMS) and ...Gladia Live (Real-time) APIWebSocket API for real-time live audio transcription with sub-second latency, supporting multi-language det...dxFeed dxLink WebSocket APIdxLink is dxFeed's WebSocket protocol for real-time market data streaming with multiplexed virtual channels...University of Amsterdam Web Socket APIThe WebSocket API from University of Amsterdam — 6 operation(s) for websocket.Spring WebFlux WebSocketReactive WebSocket support for full-duplex, bidirectional communication in WebFlux applications. Provides W...Triton One Whirligig WebSocketsWhirligig — Triton's enhanced WebSocket layer over Solana RPC. Adds the missing transactionSubscribe stream...Mudrex Market Data APIPublic, unauthenticated market-data surface for Mudrex linear perpetual futures. Over REST it returns bulk ...Tensor WebSocket APISubscription-based realtime stream of Tensor marketplace events. Channels include `newTransaction` (every c...Pred WebSocket APIPRED uses [Ably](https://ably.com/) for real-time WebSocket data. Use Ably's token auth with `POST /api/v1/...CryptoCompare Streaming WebSocketSingle secure WebSocket endpoint multiplexing every subscription via tilde-delimited subscription strings (...Exonum Node HTTP APIThe HTTP surface an Exonum node serves. The explorer service exposes REST endpoints under /api/explorer (bl...Legend WebSocket APILegend's Hyperliquid-compatible WebSocket at wss://api.legend.trade/ws, using subscription-based messaging....BigONE WebSocket APIReal-time spot market data and private order/account streams at wss://api.big.one/ws/v2 (JSON or protobuf m...Jupyter Kernel Messaging ProtocolWebSocket-based messaging protocol for communication between Jupyter clients and computational kernels. Sup...Argmax Local ServerA local transcription server for macOS that is API-compatible with the Deepgram Speech-to-Text (Live) API, ...OpenSea Stream APIReal-time WebSocket event streaming for NFT marketplace activity per collection, including item listed, ite...Speechmatics Realtime Transcription APIWebSocket API for low-latency real-time streaming transcription supporting live audio input, speaker diariz...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...Proofpoint on Demand (PoD) Log APIThe PoD Log API is Proofpoint's streaming surface rather than a request/response one: a client opens a WebS...
Thin 109 Limited public surface area
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,...Pintu Pro Partner APIPintu Pro's institutional/partner trading API. A unified message format is used over both an HTTP endpoint ...Bitnomial Market Data WebSocket APIReal-time WebSocket market-data feed delivering trade, order book, block trade, and market status messages ...Plivo Audio Stream APIThe Plivo Audio Stream API attaches a real-time WebSocket audio stream to a live call, enabling AI voice ag...Tendermint Websocket APISubscribe/unsubscribe are reserved for websocket events.Wazo Websocket Event Stream (wazo-websocketd)WebSocket gateway onto the Wazo internal event bus. An authenticated client subscribes to named platform ev...Polymarket WebSocketReal-time streaming feed for order book updates, trades, and market events on the Polymarket CLOB - used by...iTick Market Data APIToken-authenticated REST and WebSocket API for real-time and historical financial market data across crypto...Pusher Channels APIPub/sub channels over WebSocket (client) and HTTP (server publish). Public, private, and presence channels ...Deribit WebSocket APIJSON-RPC over WebSocket interface for real-time bidirectional communication with the Deribit exchange. Reco...Independent Reserve WebSockets APIWebSockets feed for order book and ticker data, documented with samples in the independentreserve/websocket...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....SpacetimeDB HTTP APIThe SpacetimeDB HTTP API lets clients and tools interact with SpacetimeDB databases: publish and delete dat...Jito Streaming SurfacesReal-time streaming surfaces from Jito infrastructure — the wss tip_stream for continuous bundle-tip percen...Mattermost WebSocket APIReal-time WebSocket event stream for Mattermost v4. Clients connect to /api/v4/websocket, authenticate via ...Nord Pool Intraday Trading APIWebSocket API for continuous intraday power trading - clients speak STOMP over secure WebSocket (port 443) ...FDC3 Desktop Agent BridgingFDC3 Desktop Agent Bridging (DAB) is a wire protocol that enables multiple Desktop Agent implementations to...Korbit Open API v2 WebSocketWebSocket streaming API for the Korbit exchange. Public channels stream ticker, orderbook and trade market ...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...Qlik Sense Engine JSON APIWebSocket protocol API using JSON-RPC for interacting with the Qlik Associative Engine.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...Virtualitics Explore Python API (pyVIP)pyVIP is the Virtualitics Python API for Virtualitics Explore. It runs over a WebSocket connection between ...OWASP ZAP Websocket APIThe websocket API from OWASP ZAP — 6 operation(s) for websocket.PartyKit Deployed Party (HTTP / WebSocket)Public HTTP and WebSocket interface for a deployed PartyKit project at project.user.partykit.dev. Each part...PartyKit Party.Server (Server API)Library API for defining server-side logic for a "party" - a backend object backed by a Cloudflare Durable ...PartyKit PartySocket (Client API)Browser and runtime client library for connecting to a PartyKit server over WebSockets. Wraps the standard ...Neuphonic TTS WebSocket APIWebSocket endpoint for continuous, low-latency text-to-speech streaming. Enables real-time voice synthesis ...PTC ThingWorx WebSocket/AlwaysOn APIPTC ThingWorx AlwaysOn WebSocket API enables persistent bidirectional connections for industrial edge devic...LMNT Speech Sessions APIWebSocket-based real-time speech generation API for streaming LLM text output to synthesized audio with res...zkSync Era WebSocketWebSocket variant of the zkSync Era JSON-RPC endpoint for real-time eth_* subscriptions (newHeads, logs, pe...QuickNode Core RPC APIMulti-chain JSON-RPC, REST, and gRPC endpoints across 77+ blockchains (Ethereum, Solana, Polygon, Arbitrum,...Foundation Event Replay APIWebSocket streaming API onto the Foundation event bus. Two channels are documented: a real-time event strea...LATOKEN Public WebSocket APISTOMP-over-WebSocket API at wss://api.latoken.com/stomp with public market-data and private account topics....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...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), ...AVEVA PI System REST APIThe AVEVA PI System REST API (PI Web API) provides RESTful HTTP access to time- series sensor data, asset m...Sense Realtime APIThe Sense Realtime API delivers live electricity usage data via a WebSocket connection, streaming second-by...BloFin WebSocket APIPublic and private WebSocket channels for futures (wss://openapi.blofin.com/ws/public, /ws/private), spot (...CometChat Realtime & Client SDKClient SDKs (JavaScript, React, React Native, Android, iOS, Flutter, Ionic) connect over a managed WebSocke...PowerTrade WebSocket FeedsReal-time WebSocket market-data feeds (reference data, top-of-book, order books, trades, index and settleme...ZenRows Scraping BrowserCloud headless browser exposed over WebSocket at wss://browser.zenrows.com?apikey=KEY, compatible with Play...Courier Inbox Real-Time APIWebSocket service that delivers Inbox messages and message-state events (read, unread, opened, archived, cl...Urban Sky SDK (Real-time Balloon Telemetry)Real-time balloon telemetry feed delivered over WebSocket via the Urban Sky SDK (JavaScript and Python, dis...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...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...Nakama Realtime Socket APIPersistent WebSocket connection carrying realtime features - status presence, realtime chat channels, relay...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...WellnessLiving WebSocket APIThe WebSocket API from WellnessLiving — 1 operation(s) for websocket.Bitvavo Market Data Pro WebSocket APIMarket Data Pro WebSocket API published by Bitvavo.Bitvavo WebSocket APIReal-time WebSocket API for market data, trading, transfers, and account management on Bitvavo.LiteLLM Realtime APIProvides /realtime WebSocket endpoints for real-time model interactions with load balancing and guardrails ...Helius Solana RPCSolana JSON-RPC and WebSocket endpoints with enhanced WebSockets, archival data, and staked connections.One Trading WebSocket Streams APIReal-time WebSocket API for market data (order book, price ticks, book ticker) and, after authenticating, p...Trading Economics Streaming APIPersistent WebSocket connection at wss://stream.tradingeconomics.com delivering live market quote ticks by ...Vert.x WebA set of building blocks for building web applications and RESTful HTTP microservices with Vert.x. Provides...Upbit WebSocket APIThe Upbit WebSocket API delivers real-time streaming data for market and account events. Public streams inc...LiveKit Signaling Protocol (WebSocket)Bi-directional WebSocket signaling protocol used by LiveKit clients to coordinate WebRTC sessions with the ...Capital.com WebSocket APIThe Capital.com WebSocket API streams real-time market data, supporting up to 40 concurrent instruments and...Hyperliquid WebSocket APIReal-time WebSocket feed delivering order-book deltas, trades, candles, BBO, user fills, user funding, user...InstantDB Realtime Sync APIThe realtime sync transport - a persistent WebSocket at wss://api.instantdb.com/runtime/session over which ...Papercups Realtime Chat API (WebSocket / Phoenix Channels)Bidirectional realtime live chat over Phoenix WebSocket channels. Clients join conversation, conversation-l...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...Ultraleap Tracking WebSocketAn open-source WebSocket server from Ultraleap that restores the LeapJS-compatible surface removed when Lea...Bitstamp WebSocket APIReal-time WebSocket API providing live market data streams including order book updates, live trades, ticke...Qlik Engine JSON APIWebSocket-based JSON-RPC API for direct interaction with the Qlik Associative Engine.1Forge Forex StreamWebSocket stream that delivers real-time bid/ask updates for subscribed forex and cryptocurrency pairs. Str...ACTIV Web One API (AtlasFeed)WebSocket-based (WebAssembly) JavaScript/TypeScript market data API for browser and Node.js, installed as n...Apache TinkerPop Gremlin Server APIThe Gremlin Server provides WebSocket and HTTP endpoints for submitting Gremlin traversals to a remote grap...Circle Realtime WebSocket APIBeta ActionCable (Rails) WebSocket surface for realtime chat and notifications, connected at wss://app.circ...Alchemy Node API (JSON-RPC)Multi-chain JSON-RPC over HTTPS and WebSockets covering standard eth_*, solana, and other chain methods, pl...Matrixport WebSocket APIThe WebSocket API from Matrixport — 1 operation(s) for websocket.Pushbullet Realtime Event StreamSecure WebSocket stream that delivers realtime events to a Pushbullet account, including periodic `nop` kee...FirecampFirecamp is an open-source API development platform for designing, testing, and documenting REST, GraphQL, ...SEC API Filing Stream APIReal-time, push-based WebSocket feed of newly published SEC EDGAR filings. Connect to wss://stream.sec-api....Bloomberg HTTP APIHTTP wrapper making the Bloomberg Open API available via HTTP and WebSockets, allowing clients to access re...HoppscotchHoppscotch is a lightweight open-source browser-based API client supporting REST, GraphQL, WebSockets, SSE,...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...Quix Streaming Reader API (Real-time)Subscribe to live parameter data, events, definitions, active streams, topic metrics, and raw packages from...WazirX WebSocket APIEndpoints for WebSocket authentication token generationeToro Market Data APIProvides REST and WebSocket access to real-time and historical market data for all asset classes available ...Perp V1 Market Maker APISigned, high-performance interface for connecting trading bots to the perp.com V1 matching engine: a privat...AISStream AIS Stream APIReal-time global AIS vessel-tracking stream delivered over a single WebSocket at "wss://stream.aisstream.io...Exotel AgentStream Voice Streaming APIDocumented WebSocket (wss://) voice-streaming API. When a call reaches a Voicebot or Stream applet, Exotel ...Railway Logs APIGraphQL log surface for builds, deployments, environments, and HTTP traffic. Available both as point-in-tim...TzKT WebSocket APIThe TzKT WebSocket API uses SignalR to deliver real-time push notifications to subscribed clients. Channels...Infura JSON-RPC APIMulti-chain JSON-RPC over HTTPS and WebSockets across 23+ networks (Ethereum, Linea, Polygon, Arbitrum, Opt...Bitso WebSocket APIReal-time streaming channels for trades, order-book diffs, and full order-book snapshots. Used by trading c...Fortnox Topics WebSocket APIDuplex WebSocket stream at wss://ws.fortnox.se/topics-v1 that pushes minimal change-notification events acr...Layercode Realtime Voice APIBidirectional realtime WebSocket transport that streams base64 PCM microphone audio from the browser to Lay...Pushover Open Client APIReal-time client API for Pushover. Combines a WebSocket channel at wss://client.pushover.net/push that stre...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...Transports (WebRTC/WebSocket)Realtime media transport layer of the framework. Bidirectional audio, video, and data flow over Daily WebRT...Gate WebSocket API v4Real-time WebSocket streams for market data (order books, trades, tickers, candlesticks) and private channe...Otis Integrated Dispatch (OID) APICloud-based or on-premise API for integrating service robots and third-party applications with Otis elevato...Rime TTS APIRealtime text-to-speech API supporting streaming HTTP, WebSocket, and SSE delivery for Arcana and Mist mode...Bitquery Streaming SubscriptionsGraphQL subscriptions over WebSocket for real-time blockchain data - live DEX trades, transfers, pending tr...
Emerging 52 Early or largely undocumented
Bithumb WebSocket APIReal-time WebSocket API for streaming market data including tickers, order books, and trade executions, as ...Morgan Stanley API Platform (WebSocket Streaming)Alongside its REST APIs, the Morgan Stanley API Platform exposes streaming WebSocket APIs for onboarded ins...Photon Realtime Transport ProtocolThe core Photon protocol - NOT a REST or JSON API. Clients connect through a Name Server to a Master Server...Sei Websocket APISubscribe/unsubscribe are reserved for websocket events.Vocode Realtime Streaming ConversationReal-time, bidirectional streaming conversation pipeline (StreamingConversation) in the open-source library...AgentSea Agent REST APIHTTP surface exposed by the AgentSea NestJS module (@lov3kaizen/agentsea-nestjs) when enableRestApi/enableW...Whop Realtime WebSocket APIBidirectional realtime WebSocket for Whop apps - custom app messages and chat/feed updates - connected and ...Sui Websocket APIThe Websocket API from Sui — 2 operation(s) for websocket.Bitget WebSocket APIReal-time WebSocket API providing public and private channels for market data (tickers, candles, order book...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...Aevo Exchange WebSocket APIReal-time WebSocket API for Aevo exchange providing low-latency streams for orderbook updates, trade feeds,...NestJSNestJS is a progressive Node.js framework for building efficient, reliable, and scalable server-side applic...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,...AgentOS Runtime APIPre-built FastAPI runtime that exposes 50+ REST, SSE, and WebSocket endpoints for running agents, teams, an...Litecoin Space WebSocket APIA real-time WebSocket API provided by Litecoin Space (litecoinspace.org) for subscribing to live Litecoin n...Respeecher Space Real-Time TTS APILow-latency real-time text-to-speech that begins streaming audio in under 200ms via three transports - one-...WhistleWhistle is a cross-platform HTTP, HTTPS, HTTP/2, WebSocket, and TCP debugging proxy tool. It lets developer...Mantle WebSocket (Mainnet)WebSocket endpoint for real-time JSON-RPC subscriptions on Mantle mainnet - new blocks, new pending transac...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...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...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 ...QuoteMedia Streaming Data Feed APIEnterprise tick-by-tick streaming feed for real-time or delayed Level 1 and Level 2 market data, normalized...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...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...Rev AI Streaming Speech-to-Text APIReal-time speech transcription via WebSocket connections supporting up to 10 concurrent streams with a 3-ho...ABB Robot Web Services (RWS)Robot Web Services is the canonical REST/HTTP(S) API exposed by ABB OmniCore (RobotWare 7) and IRC5 control...ABB Robot Web Services SubscriptionsWebSocket-based subscription service that pushes change events for subscribed RWS resources (IO signals, RA...RestfoxRestfox is a lightweight, offline-first web HTTP client for testing REST APIs, similar to Postman but brows...Lyra WebSocket APIWebSocket API for real-time streaming of market data, order book updates, ticker subscriptions, and private...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...Huly Platform SDKThe @hcengineering/api-client Node.js package provides typed programmatic access to the Huly Platform. It e...Nitric Websocket ResourceSDK resource for declaring realtime bidirectional websocket endpoints with connect, disconnect, and message...Mock Service WorkerMock Service Worker (MSW) is an open-source library for mocking REST, GraphQL, WebSocket, and Server-Sent E...CoinDCX Streaming Socket.IO APIReal-time Socket.IO streaming at stream.coindcx.com for public spot and futures market data (orderbook dept...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...Flowdesk Platform ConnectFlowdesk Platform Connect is the developer API for programmatic OTC spot trading. It offers a REST interfac...tldraw Sync (Multiplayer)tldraw provides a multiplayer sync layer (WebSocket-based) that customers can self-host or use through tldr...Soketi Pusher-Compatible APIImplements the Pusher protocol (channels, private channels, presence channels, encrypted channels) for drop...Qlik Engine APIJSON-RPC API for interacting with the Qlik Associative Engine.Netflix Zuul Push MessagingZuul Push Messaging enables server-to-client push communications over WebSockets and Server Sent Events (SS...Dash Insight REST APIOpen-source REST and WebSocket API for querying the Dash Core (layer 1) blockchain. Provides endpoints for ...Jakarta WebSocketJakarta WebSocket defines a standard API for creating server and client endpoints that communicate using th...Abios Atlas APIAtlas is the Abios REST and WebSocket data API delivering fixtures, live match state, historical stats, pla...
Minimal 4 Almost no public developer surface
MayStreet High Performance Query (HPQ) APILow-latency, near-time market data query API delivered as a streaming WebSockets service so clients can pro...Soccer APIThe advertised live football data API — REST plus a WebSocket stream — covering competitions, fixtures, liv...Parallel Finance JSON-RPC (polkadot.js)Substrate/Polkadot JSON-RPC interface to the Parallel Finance parachain, accessed over WebSocket with the p...TD Ameritrade Streaming Market Data APIProvides a WebSocket-based streaming API that delivers up-to-the-second market data including real-time Lev...
Companies reaching this through an API (158)
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
AgentSea
Aisera
Alchemy
Allo-Media
Amberdata
Anaconda
Apache TinkerPop
APIClaw
Apstal
Argmax
Arkham Intelligence
AT Protocol
Axway
Benzinga
BigONE
Binance
BitFury
BitMart
Bitnomial
Bitquery
Bitso
Bitvavo
Blazing Bullet Private Limited
Blockchain.com
Bloomberg Professional Service
Bright Data
BuiltWith
Bullish
Circle
CoinDCX
CometChat
Courier
CryptoCompare
Cryptomus
Dash
Deutsche Börse
dxFeed
EODHD
Exotel
fal
FDC3
Fortnox
Google Gemini
Hansoft
Helius
Huly
Hyperliquid
Independent Reserve
Show all 158 companies ↓
Infura
InstantDB
Jakarta EE
Jito Labs
Juniper Mist AI
Jupyter Notebook
Kalshi
Layercode
LBank
Litecoin
LiteLLM
LiveChat
LiveKit
LMNT
Lukka
Lyra
Mantle Network
Mattermost
May Mobility
MayStreet
MEXC
Morgan Stanley
Morningstar
Mudrex
Nabla
Nakama
Neon
Netflix Zuul
Nitric
Nord Pool
OpenSea
Options Technology
Oracle Hospitality
Otis Worldwide
OWASP ZAP
Papercups
Parallel Finance
Paymentsense
Pendle Finance
Perp
Phidata / Agno
Pipecat
Plivo
Polymarket
Portainer
Pred
Proofpoint
Pushbullet
Pushover
Qlik
Qlik Cloud
Qlik Mashups
Qlik Sense
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
Solana
Spring WebFlux
StepFun
Sui
Supabase
Supra
Sygnum
Syndica
Synthetix
TD Ameritrade
Tendermint
Tensor
The Mobility House
ThetaData
tldraw
Tradier
Trading Economics
Trigger.dev
Triton One
Twelve Data
Twitch
Ultraleap
Ultravioleta DAO
University of Amsterdam
Upstox
Urban Sky
Vert.x
Virtualitics
Vocode
Wazo
WellnessLiving
Whop
XRP Ledger
ZenRows
zkSync
Score breakdown
Frequency
68.8
log-scaled weighted occurrences
Breadth
2.4
spread across providers
Quality lift
38.9
mean composite of providers using it
Cohesion
27.8
strength of nearest seed neighbor
Related tags
Real-Time 169 co-occurrences
Market Data 91 co-occurrences
Streaming 111 co-occurrences
Trading 75 co-occurrences
Exchange 44 co-occurrences
Cryptocurrency 86 co-occurrences
Derivatives 27 co-occurrences
Futures 23 co-occurrences
Where this tag comes from
Provider tag107
Api tag275
Openapi tag18
Openapi op tag52
Cohort brief
Auto-generatedThe 105 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
105
all scored
Mean Kin Score
37.1
+14.9 vs catalog 22.2
Mean Agent Readiness
24.2
+12.2 vs catalog 12
Spread
11.3–78
median 35.6 · σ 14
How the 105 split by band
Exemplar 4Strong 9Developing 27Thin 39Emerging 26Minimal 0
Facet averages, against the whole catalog
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Contract Quality | 39.9 | 17.2 | +22.7 | 105 |
| Developer Ergonomics | 43.6 | 23.2 | +20.4 | 105 |
| Operational Transparency | 27.9 | 13 | +14.9 | 105 |
| Discoverability | 70.3 | 57.9 | +12.4 | 105 |
| Access Clarity | 29.4 | 23.9 | +5.5 | 105 |
| Contract Governance | 11.3 | 6.5 | +4.8 | 105 |
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) | 21% | 13% | +8 |
| MCP server (first-party) | 22% | 12% | +10 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 8% | 11% | -3 |
| Security | 98% | 98% | 0 |
| Arazzo workflows | 6% | 2% | +4 |
| Governance rules | 45% | 16% | +29 |
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 Postman 78
- 2 0xArchive 71.7
- 3 Amazon API Gateway 69.1
- 4 Gemini Trust Company 67.6
- 5 Massive (formerly Polygon.io) 64.9
- 6 Kraken 64.4
- 7 SiftingIO 61.1
- 8 AgentMail 60.4
- 9 Odds API 58.9
- 10 Heroic Labs 58.8
Top by Agent Readiness
- 1 0xArchive 68.7
- 2 AgentMail 64.6
- 3 Massive (formerly Polygon.io) 59.9
- 4 WhiteBIT 55.9
- 5 Postman 55.6
- 6 Gemini Trust Company 49.5
- 7 Odds API 45.5
- 8 PubNub 45.2
- 9 SiftingIO 43.2
- 10 Korbit 43.2
All 105 members of this roster resolve to a scored provider in
the catalog.
Coverage caveat. 83 of 105 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 24 October 2026, across 31984 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.
Coverage caveat. 83 of 105 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 24 October 2026, across 31984 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.