vocabulary:
  name: TD Ameritrade Vocabulary
  description: >-
    Domain vocabulary for the TD Ameritrade brokerage API (now deprecated following
    acquisition by Charles Schwab in May 2024). Documents key trading, account
    management, and market data terms from the TD Ameritrade developer platform.
  url: https://developer.tdameritrade.com/
  version: '2026-05-03'
  tags:
    - Finance
    - Brokerage
    - Trading
    - Market Data
    - Deprecated

terms:

  - term: TD Ameritrade
    definition: >-
      Online brokerage firm acquired by Charles Schwab. TD Ameritrade provided
      developer APIs for programmatic trading until May 2024 when the platform
      was fully migrated to Charles Schwab.
    type: Brand
    tags:
      - Company

  - term: Charles Schwab Trader API
    definition: >-
      The successor API to TD Ameritrade following the Schwab acquisition.
      Available at developer.schwab.com for new registrations.
    type: Service
    tags:
      - Successor

  - term: Account
    definition: >-
      A brokerage account holding securities positions, cash balances, and
      order history. Can be CASH or MARGIN type.
    type: Resource
    tags:
      - Core Resource

  - term: Order
    definition: >-
      An instruction to buy or sell a security. Can be MARKET, LIMIT, STOP,
      STOP_LIMIT, or other types with various duration and session options.
    type: Resource
    tags:
      - Trading

  - term: Order Leg
    definition: >-
      A single component of a trade order specifying the instruction (BUY/SELL),
      quantity, and instrument. Complex orders may have multiple legs.
    type: Concept
    tags:
      - Trading

  - term: CUSIP
    definition: >-
      Committee on Uniform Securities Identification Procedures number. A 9-character
      alphanumeric identifier uniquely identifying a security in North America.
    type: Identifier
    tags:
      - Instrument

  - term: Quote
    definition: >-
      Real-time market data for a security including bid/ask prices, last trade,
      volume, and other market statistics.
    type: Resource
    tags:
      - Market Data

  - term: Option Chain
    definition: >-
      A list of all available option contracts for a given underlying security,
      organized by expiration date and strike price.
    type: Resource
    tags:
      - Options

  - term: Watchlist
    definition: >-
      A named list of securities that a user tracks for monitoring purposes.
      Persisted per account.
    type: Resource
    tags:
      - Portfolio Management

  - term: Price History
    definition: >-
      Historical OHLCV (Open, High, Low, Close, Volume) price data for a security,
      available at minute, daily, weekly, or monthly frequencies.
    type: Resource
    tags:
      - Market Data

  - term: Market Movers
    definition: >-
      The top 10 securities with the largest price changes (up or down) by value
      or percentage for a given market index.
    type: Resource
    tags:
      - Market Data

  - term: OAuth 2.0
    definition: >-
      Authentication protocol used by TD Ameritrade API. Requires authorization
      code flow with offline access scope for refresh tokens.
    type: Authentication
    tags:
      - Security

  - term: Pattern Day Trader
    abbreviation: PDT
    definition: >-
      FINRA-defined classification for accounts that execute four or more day trades
      within five business days in a margin account, requiring $25,000 minimum equity.
    type: Regulatory Concept
    tags:
      - Regulatory
      - Compliance

  - term: Buying Power
    definition: >-
      The amount of funds available in an account to purchase securities.
      For margin accounts, this exceeds the cash balance.
    type: Account Metric
    tags:
      - Account

  - term: Day Trade
    definition: >-
      Opening and closing the same security position within the same trading day.
    type: Trading Concept
    tags:
      - Trading

  - term: Good Till Cancel
    abbreviation: GTC
    definition: >-
      An order duration option where the order remains active until it is either
      executed or manually cancelled by the trader.
    type: Order Duration
    tags:
      - Order Management