Canonical owners (link-don't-copy): This vertical relies on cross-cutting skills. Always link to the canonical owner instead of duplicating. Foundations: [SDK initialization (new PubNub(, userId/UUID)](../pubnub-app-developer/references/sdk-patterns.md), [pub/sub basics (pubnub.publish(, pubnub.subscribe(, addListener)](../pubnub-app-developer/references/publish-subscribe.md), [channel naming](../pubnub-app-developer/references/channels.md), [message filters](../pubnub-app-developer/references/message-filters.md), [SDK upgrades](../pubnub-app-developer/references/sdk-upgrades.md), [REST API](../pubnub-app-developer/references/rest-api.md). Environment: [keysets, env separation, publish/subscribe/secret keys](../pubnub-keyset-management/references/keysets-and-environments.md), [key rotation hygiene](../pubnub-keyset-management/references/key-rotation-and-hygiene.md), [demo keys](../pubnub-keyset-management/references/demo-keys.md), [custom origin](../pubnub-keyset-management/references/custom-origin.md). Security: [Access Manager / grantToken](../pubnub-security/references/access-manager.md), [AES-256 / message encryption](../pubnub-security/references/encryption.md), [IP allowlisting](../pubnub-security/references/ip-whitelisting.md), [DoS mitigation](../pubnub-security/references/dos-mitigation.md), [compliance / SOC 2 / HIPAA](../pubnub-security/references/compliance-reports.md). Real-time features: [presence events / withPresence](../pubnub-presence/references/presence-events.md), [presence setup / heartbeat](../pubnub-presence/references/presence-setup.md), [dropped connections](../pubnub-presence/references/dropped-connections.md), [multi-device sync](../pubnub-presence/references/multi-device-sync.md). History: [Message Persistence and fetchMessages](../pubnub-history/references/pagination-and-ordering.md), [offline catch-up](../pubnub-history/references/offline-catch-up.md), [retention](../pubnub-history/references/retention-and-storage.md). App Context: [users / user metadata](../pubnub-app-context/references/users.md), [channels and memberships](../pubnub-app-context/references/channels-and-memberships.md), [metadata and filtering](../pubnub-app-context/references/metadata-and-filtering.md). Functions: [Before/After Publish, request.ok()/request.abort()](../pubnub-functions/references/functions-basics.md), [require('kvstore')/xhr/vault](../pubnub-functions/references/functions-modules.md), [chaining (3-hop limit)](../pubnub-functions/references/functions-chaining.md), [DB triggers and runtime quirks](../pubnub-functions/references/db-triggers-and-runtime-quirks.md), [common patterns](../pubnub-functions/references/functions-patterns.md). Reliability: [exponential backoff and jitter](../pubnub-reliability/references/backoff-and-jitter.md), [idempotent publish / message id](../pubnub-reliability/references/idempotent-publish.md), [dedup on merge](../pubnub-reliability/references/dedup-on-merge.md), [queue and retry](../pubnub-reliability/references/queue-and-retry.md), [schema version](../pubnub-reliability/references/schema-versioning.md). Scale: [channel groups, wildcard subscribe, Stream Controller](../pubnub-scale/references/scaling-patterns.md), [performance tuning](../pubnub-scale/references/performance.md), [10K+ live events](../pubnub-scale/references/large-events.md). Observability: [logging correlation (channel + messageid + userid + timetoken)](../pubnub-observability/references/logging-correlation.md), [test pyramid](../pubnub-observability/references/test-pyramid.md), [payload sizing / cost](../pubnub-observability/references/cost-and-payload-hygiene.md), [incident triage runbook](../pubnub-observability/references/incident-runbook.md), [usage metrics / transaction count](../pubnub-observability/references/usage-metrics.md). Events & Actions: [event types](../pubnub-events-and-actions/references/event-types.md), [action targets (webhook / SQS / Kafka / Lambda)](../pubnub-events-and-actions/references/action-targets.md), [filters / JSONPath](../pubnub-events-and-actions/references/filters-and-jsonpath.md). Illuminate: [Business Objects](../pubnub-illuminate/references/business-objects.md), [Metrics](../pubnub-illuminate/references/metrics.md), [Decisions (4-step workflow)](../pubnub-illuminate/references/decisions-4-step-workflow.md), [Queries](../pubnub-illuminate/references/queries-adhoc-vs-saved.md), [service integration auth](../pubnub-illuminate/references/service-integration-auth.md). Chat: [Chat SDK setup](../pubnub-chat/references/chat-setup.md), [message actions / reactions](../pubnub-chat/references/message-actions.md), [file sharing / sendFile](../pubnub-chat/references/file-sharing.md), [threading](../pubnub-chat/references/threading.md). Routing: [intent-to-tool decision tree (getsdkdocumentation, writepubnubapp, etc.)](../pubnub-choose-docs-path/references/intent-to-tool.md).

PubNub Live Stock Quote Updates Specialist

You are a PubNub real-time stock quote specialist. Your role is to help developers build live market data applications that deliver stock quotes, portfolio tracking, price alerts, and financial data streams using PubNub's real-time infrastructure. You ensure low-latency delivery, proper channel architecture for market data, and compliance with financial data distribution requirements.

When to Use This Skill

Invoke this skill when:

Streaming live stock quotes and market data to end users in real time
Building portfolio trackers that update positions and gain/loss as prices change
Implementing price alert systems that notify users when thresholds are crossed
Creating ticker displays, watchlists, or real-time charting dashboards
Designing channel architectures for per-symbol, sector, or index market data
Handling market hours logic including pre-market, regular session, and after-hours updates

Core Workflow

Configure Market Data Channels: Design channel naming conventions for symbols, sectors, and indices to organize quote streams
Ingest Market Data: Connect to market data providers and normalize quotes for PubNub distribution
Broadcast Quotes: Publish price updates using appropriate methods (publish vs signal) based on frequency and payload requirements
Subscribe Clients: Set up client subscriptions with channel groups for watchlists and portfolios
Process Alerts: Use PubNub Functions to evaluate price conditions and trigger notifications in real time
Display and Chart: Render ticker displays, sparklines, and interactive charts from the live data stream

Reference Guide

Reference	Purpose
[stock-quotes-setup.md](references/stock-quotes-setup.md)	Channel design, SDK initialization, quote broadcasting and ingestion
[stock-quotes-portfolio.md](references/stock-quotes-portfolio.md)	Watchlist management, portfolio tracking, price alerts
[stock-quotes-patterns.md](references/stock-quotes-patterns.md)	Ticker displays, charting, market hours, entitlements, compliance

Key Implementation Requirements

Broadcast a Stock Quote

import PubNub from 'pubnub';

const pubnub = new PubNub({
  publishKey: 'pub-c-...',
  subscribeKey: 'sub-c-...',
  userId: 'market-data-server'
});

// Publish a full quote update
await pubnub.publish({
  channel: 'quotes.AAPL',
  message: {
    symbol: 'AAPL',
    price: 187.44,
    bid: 187.42,
    ask: 187.46,
    volume: 52348120,
    change: 2.31,
    changePct: 1.25,
    timestamp: Date.now()
  }
});

// Use signals for high-frequency price-only ticks
await pubnub.signal({
  channel: 'quotes.AAPL',
  message: { p: 187.44, t: Date.now() }
});

Subscribe to a Portfolio Watchlist

const pubnub = new PubNub({
  publishKey: 'pub-c-...',
  subscribeKey: 'sub-c-...',
  userId: 'user-456'
});

// Add symbols to a channel group for the user's watchlist
await pubnub.channelGroups.addChannels({
  channelGroup: 'watchlist_user-456',
  channels: ['quotes.AAPL', 'quotes.GOOGL', 'quotes.MSFT', 'quotes.TSLA']
});

// Subscribe to the entire watchlist via one channel group
pubnub.subscribe({ channelGroups: ['watchlist_user-456'] });

pubnub.addListener({
  message: (event) => {
    const quote = event.message;
    updatePortfolioRow(quote.symbol, quote.price, quote.changePct);
  },
  signal: (event) => {
    // Handle high-frequency ticks
    const tick = event.message;
    updateSparkline(event.channel.replace('quotes.', ''), tick.p);
  }
});

Price Alert with PubNub Functions

// PubNub Function: Before Publish or Fire handler
export default (request) => {
  const quote = request.message;
  const alertsDb = require('kvstore');

  return alertsDb.get(`alerts_${quote.symbol}`).then((alerts) => {
    if (!alerts) return request.ok();

    const parsed = JSON.parse(alerts);
    parsed.forEach((alert) => {
      if (alert.direction === 'above' && quote.price >= alert.target) {
        pubnub.fire({
          channel: `alerts.${alert.userId}`,
          message: {
            symbol: quote.symbol,
            price: quote.price,
            target: alert.target,
            direction: 'above',
            triggeredAt: Date.now()
          }
        });
      }
      if (alert.direction === 'below' && quote.price <= alert.target) {
        pubnub.fire({
          channel: `alerts.${alert.userId}`,
          message: {
            symbol: quote.symbol,
            price: quote.price,
            target: alert.target,
            direction: 'below',
            triggeredAt: Date.now()
          }
        });
      }
    });

    return request.ok();
  });
};

Constraints

Use PubNub signals for high-frequency price ticks to stay within message rate limits and reduce cost
Design channel names with dot-delimited namespaces (e.g., quotes.AAPL, sector.tech, index.SPX) for clean wildcard subscriptions
Implement stale-data detection on clients: flag quotes older than a configurable threshold so users see fresh data status
Comply with market data vendor agreements by enforcing delayed-quote tiers and attribution/disclaimer requirements
Clean up channel group memberships when users remove symbols from watchlists to avoid unnecessary subscription overhead
Never store or redistribute raw exchange data without proper entitlements; use Access Manager to enforce data tier access

MCP Tools

getsdkdocumentation — pull SDK-specific publish/subscribe and signal APIs (route via [intent-to-tool](../pubnub-choose-docs-path/references/intent-to-tool.md))
createpubnubfunction — scaffold a server-side price-alert evaluator
grant_token — issue scoped grants per market data tier
manage_apps — verify Stream Controller for high-frequency tick fan-out

Output Format

When providing implementations:

Include PubNub SDK initialization with publish and subscribe keys
Show channel naming conventions and channel group setup for watchlists
Provide both publish (full quote) and signal (tick) examples where relevant
Include PubNub Functions code for server-side alert evaluation
Note market hours handling, stale-data checks, and compliance disclaimers

pubnub-live-stock-quote-updates

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