MayStreet

aid: maystreet
url: https://raw.githubusercontent.com/api-evangelist/maystreet/refs/heads/main/apis.yml
name: MayStreet
kind: company
description: 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.
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  - sandbox
  - url: https://maystreet.com/
    status: 301
    note: declared website redirects to https://www.lseg.com/en/data-analytics/market-data/data-feeds — a different registrable
      domain (maystreet.com -> lseg.com), possible rename or acquisition (probed 2026-09-03, roadmap#169)
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/maystreet.png
tags:
- Finance
- Market Data
- Real-Time
- Trading
- Low Latency
- Tick Data
- Order Book
- Stocks
- Options
- Feed Handlers
- PCAP
tags_raw:
- Financial
- Market Data
- Real-Time
- Trading
- Low Latency
- Tick Data
- Order Book
- Equities
- Options
- Feed Handlers
- PCAP
created: '2026-07-21'
modified: '2026-07-22'
specificationVersion: '0.23'
apis:
- aid: maystreet:maystreet-high-performance-query-api
  name: MayStreet High Performance Query (HPQ) API
  tags:
  - Market Data
  - WebSocket
  - Streaming
  - Tick Data
  - Near-Time
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://github.com/maystreet/workbench-hpq-springboard
  baseURL: wss://mdx.uat.maystreet.com
  properties:
  - url: https://github.com/maystreet/workbench-hpq-springboard
    type: Documentation
  description: 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.
- aid: maystreet:maystreet-data-lake-query-api
  name: MayStreet Market Data Lake Query API
  tags:
  - Market Data
  - Historical
  - Tick Data
  - SQL
  - Python
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://github.com/maystreet/workbench-data-lake-springboard
  properties:
  - url: https://github.com/maystreet/workbench-data-lake-springboard
    type: Documentation
  - url: https://github.com/maystreet/workbench-medusa-springboard
    type: Documentation
  description: 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 client functions through the Medusa2 Python client library
    inside Analytics Workbench. The Medusa client also reaches Refinitiv Tick History and Machine Readable News History stores
    backed by Google BigQuery. Publicly documented only via springboard example repositories on GitHub; no public REST endpoint
    or self-serve access is documented.
common:
- type: DomainSecurity
  url: security/maystreet-domain-security.yml
- type: Authentication
  url: authentication/maystreet-authentication.yml
- type: Conventions
  url: conventions/maystreet-conventions.yml
- type: ErrorCatalog
  url: errors/maystreet-problem-types.yml
- type: Sandbox
  url: sandbox/maystreet-sandbox.yml
- type: Lifecycle
  url: lifecycle/maystreet-lifecycle.yml
- type: LLMsTxt
  url: llms/maystreet-llms.txt
- type: Website
  url: https://maystreet.com/
- type: GitHubOrganization
  url: https://github.com/maystreet
- type: LinkedIn
  url: https://www.linkedin.com/company/maystreet
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com