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Paxos offers WebSocket APIs for real-time market data:

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Smart Order Routing WebSocket API

Authenticated, bidirectional WebSocket API for Order Routing customers. Stream aggregated order book updates, top-of-book quotes, execution data, and heartbeats. Learn more.

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Stablecoin Market Price Feed

Public WebSocket feed for external stablecoin market index prices. No authentication required. Learn more.
For a hands-on introduction to Order Routing streams, see the Smart Order Routing WebSocket guide.

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Smart Order Routing

Production: wss://ws.paxos.com/
Sandbox: wss://ws.sandbox.paxos.com/ Authentication uses OAuth2 with the exchange:read_aggregated_marketdata_stream scope. See rate limits for subscription guidance.

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Stablecoin Market Price Feed

The stablecoin market price feed provides real-time market index price updates for external stablecoins. No authentication is required.
  • Current support: USDCUSD
  • Update frequency: Typically ~1 message per second, varying with market volatility
  • Message content: Market name, current price (4 decimals), and timestamp

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Server Endpoints

Production: wss://ws.paxos.com
Sandbox: wss://ws.sandbox.paxos.com

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Channels

  • /marketdata/stablecoin — All stablecoin markets
  • /marketdata/stablecoin/{market} — Single stablecoin market (for example, USDCUSD)
See the Stablecoin Data API reference for message schemas and examples.

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Example

Request URL: wss://ws.sandbox.paxos.com/marketdata/stablecoin/USDCUSD
Once a secure (wss://) connection is established, the feed begins streaming data subject to the rate limits. Clients should implement a reconnection mechanism in case of server disconnection.