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.
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