# MayStreet

**Canonical:** https://apis.io/providers/maystreet/  
**Website:** https://maystreet.com/  
**APIs profiled:** 2

MayStreet is a low-latency market data infrastructure vendor founded in 2012 and acquired by London Stock Exchange Group (LSEG) in May 2022, with maystreet.com now redirecting into LSEG's data feeds pages. The company captures full-depth exchange feeds in raw PCAP form across 300+ venues and sells them through the Bellport feed handler (C++ library, on-premises or managed), a 20+ petabyte Market Data Lake of historical tick data (PCAP/Parquet queried via Athena SQL and the Medusa Python client), the cloud Analytics Workbench (JupyterLab), and the High Performance Query (HPQ) streaming WebSocket API for near-time data. Access is sales-gated and entitlement-managed with no self-serve signup or public developer portal; the public API surface that exists is documented through example "springboard" repositories on the MayStreet GitHub organization rather than a docs site.

## Kin Score — 8.5 / 100 (minimal)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 8.5).

| Facet | Score |
|---|---|
| Discoverability | 66.7 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 2.6 |
| Developer Ergonomics | 19.0 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

Regulatory layer — **Securities & Market Data**: 20.0 (matched via tags).

## Agent readiness — 12.0 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## APIs (2)

- **MayStreet High Performance Query (HPQ) API** — 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. ...
- **MayStreet Market Data Lake Query API** — Query access to MayStreet's 20+ petabyte Market Data Lake of historical exchange data captured as PCAP and converted to Parquet, exposed as Athena SQL plus a growing set of clie...

## Security (2)

- **Maystreet Authentication** — http-bearer/custom-header · 2 schemes
- **Maystreet Domain Security** — TLSv1.2 · HSTS · DMARC

## Tags

Financial, Market Data, Real-Time, Trading, Low Latency, Tick Data, Order Book, Equities, Options, Feed Handlers, PCAP

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/maystreet/). Scores are computed from the provider's own public artifacts under a published rubric.