# MayStreet High Performance Query (HPQ) API

**Canonical:** https://apis.io/apis/maystreet/maystreet-high-performance-query-api/  
**Provider:** MayStreet — https://apis.io/providers/maystreet/  
**Base URL:** wss://mdx.uat.maystreet.com  
**Documentation:** https://github.com/maystreet/workbench-hpq-springboard

MayStreet High Performance Query (HPQ) API is one of 2 APIs that [MayStreet](https://apis.io/providers/maystreet/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Market Data, WebSocket, Streaming, Tick Data, and Near-Time. The published artifact set on APIs.io includes API documentation.

Low-latency, near-time market data query API delivered as a streaming WebSockets service so clients can process arbitrarily-sized result sets frame-by-frame without pagination. Publicly documented only through the workbench-hpq-springboard example notebooks and hpq.py client on GitHub, which name the UAT endpoint wss://mdx.uat.maystreet.com (the production mdx.maystreet.com host resolves in DNS but is entitlement-gated and not publicly reachable). Access requires a MayStreet/LSEG Analytics Workbench entitlement.

## Machine-readable artifacts (2)

- **Documentation** — https://github.com/maystreet/workbench-hpq-springboard
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/maystreet/refs/heads/main/apis.yml

## Other MayStreet APIs (1)

- [MayStreet Market Data Lake Query API](https://apis.io/apis/maystreet/maystreet-data-lake-query-api/)

## Tags

Market Data, WebSocket, Streaming, Tick Data, Near-Time

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/maystreet/maystreet-high-performance-query-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/maystreet/.