BMLL Technologies

aid: bmll-technologies
url: https://raw.githubusercontent.com/api-evangelist/bmll-technologies/refs/heads/main/apis.yml
name: BMLL Technologies
kind: company
description: BMLL is a London-based provider of harmonised historical Level 3, 2, and 1 order book data and analytics for
  capital markets, covering global equities, ETFs, futures, and options. Acquired by Nordic Capital in October 2025 (with
  Optiver as minority shareholder), BMLL sells its data through the BMLL Data Lab hosted Python environment, the BMLL Data
  Feed file product, and entitlement-gated REST APIs (Reference Data, Time-Series, Market Data, and an async query APIv2)
  documented publicly via the bmll Python SDK on PyPI, with delivery over API, S3, SFTP, and Snowflake. There is no self-serve
  signup - access is sales-led with key-pair credentials issued per account.
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/bmll-technologies.png
tags:
- Financial
- Market Data
- Order Book
- Stocks
- Trading
- Reference Data
- Historical Data
- Analytics
- ETF
- Futures
- Options
created: '2026-07-21'
modified: '2026-07-22'
specificationVersion: '0.19'
apis:
- aid: bmll-technologies:bmll-reference-data-api
  name: BMLL Reference Data API
  tags:
  - Reference Data
  - Instruments
  - Markets
  - Listings
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://pypi.org/project/bmll/
  baseURL: https://reference.data.bmlltech.com
  properties:
  - url: https://pypi.org/project/bmll/
    type: Documentation
  - url: https://data.bmlltech.com
    type: Portal
  description: Query reference data for the instruments, listings, and markets in the BMLL universe (equities, ETFs, futures,
    options), including availability by data type (LOB, listing/instrument/market-level metrics, DataFeed) and ETF constituent
    data. Documented publicly through the bmll Python SDK (ReferenceDataClient); the host is live but requires entitled key-pair
    credentials (probed 403 without auth).
- aid: bmll-technologies:bmll-time-series-api
  name: BMLL Time-Series API
  tags:
  - Time Series
  - Analytics
  - Order Book
  - Metrics
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://pypi.org/project/bmll/
  baseURL: https://time-series.data.bmlltech.com
  properties:
  - url: https://pypi.org/project/bmll/
    type: Documentation
  - url: https://data.bmlltech.com
    type: Portal
  description: Daily time-series metrics and analytics derived from BMLL's harmonised Level 3 order book history, including
    classified trades, queried by instrument, listing, or market. Documented publicly through the bmll Python SDK (TimeSeriesClient);
    the host is live but requires entitled key-pair credentials (probed 403 without auth).
- aid: bmll-technologies:bmll-market-data-api
  name: BMLL Market Data API
  tags:
  - Market Data
  - Market State
  - CBBO
  - Quotes
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://pypi.org/project/bmll/
  baseURL: https://market-data.data.bmlltech.com
  properties:
  - url: https://pypi.org/project/bmll/
    type: Documentation
  - url: https://data.bmlltech.com
    type: Portal
  description: Retrieve per-instrument market state and consolidated best bid and offer (CBBO) for listings on a given day,
    with an async poll-for-result request pattern. Documented publicly through the bmll Python SDK (MarketDataClient); the
    host is live but requires entitled key-pair credentials (probed 403 without auth).
- aid: bmll-technologies:bmll-api-v2
  name: BMLL APIv2 Query API
  tags:
  - Datasets
  - Query
  - Async
  - Historical Data
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://pypi.org/project/bmll/
  baseURL: https://api.data.bmlltech.com
  properties:
  - url: https://pypi.org/project/bmll/
    type: Documentation
  - url: https://data.bmlltech.com
    type: Portal
  description: Asynchronous dataset query API (initiate query, poll, download results as JSONL/Arrow into pandas or polars)
    over BMLL datasets, including a timeseries query endpoint. An OpenAPI definition exists at https://api.data.bmlltech.com/openapi.json
    but it returned HTTP 401 Unauthorized when probed, so it could not be harvested. Documented publicly through the bmll
    Python SDK (ApiV2Client).
common:
- type: DomainSecurity
  url: security/bmll-technologies-domain-security.yml
- type: Website
  url: https://bmlltech.com/
- type: Portal
  url: https://data.bmlltech.com
- type: Documentation
  url: https://www.bmlltech.com/products/bmll-data-feed/documentation
- type: GitHubOrganization
  url: https://github.com/bmlltech
- type: LinkedIn
  url: https://www.linkedin.com/company/bmll
- type: Blog
  url: https://www.bmlltech.com/knowledge-hub
- type: Support
  url: https://support.bmlltech.com/
- type: PrivacyPolicy
  url: https://www.bmlltech.com/support-pages/privacy
- type: TermsOfService
  url: https://www.bmlltech.com/support-pages/terms
- type: Compliance
  url: https://www.bmlltech.com/news/our-news/bmll-awarded-iso-27001-certification
- type: Packages
  url: packages/bmll-technologies-packages.yml
- type: SDKs
  url: packages/bmll-technologies-packages.yml
- type: Authentication
  url: authentication/bmll-technologies-authentication.yml
- type: Conventions
  url: conventions/bmll-technologies-conventions.yml
- type: ErrorCatalog
  url: errors/bmll-technologies-problem-types.yml
- type: Conformance
  url: conformance/bmll-technologies-conformance.yml
- type: ChangeLog
  url: changelog/bmll-technologies-changelog.yml
- type: CLI
  url: cli/bmll-technologies-cli.yml
- type: Lifecycle
  url: lifecycle/bmll-technologies-lifecycle.yml
- type: LLMsTxt
  url: llms/bmll-technologies-llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com