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.
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/maystreet.png
tags:
- 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: '0.19'
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