generated: '2026-07-22'
method: searched
source: https://docs.alpaca.markets/us/changelog
description: >-
  Alpaca publishes an auto-generated, dated API changelog on the docs site (announced alongside the
  Trading MCP Server and CLI in June 2026). Entries are per-change, tagged by API surface (Broker,
  Trading, Market Data) and list affected endpoints. Recent window captured below; the live
  changelog is the source of truth.
scheme: dated entries (auto-generated from spec/docs changes), per-API-surface
entries:
  - date: '2026-07-20'
    title: ULID Regeneration for Historical v1 Event Streams
    apis: [Broker API]
    kind: data-correction
    highlights:
      - Regenerated non-unique event_ulid values on /v1/events/accounts/status and /v1/events/nta (June 2023 - December 2024 window); numeric event_id unchanged.
    url: https://docs.alpaca.markets/us/changelog/ulid-regeneration-for-historical-v1-event-streams
  - date: '2026-07-20'
    title: Clarified the archive-portfolio description
    apis: [Broker API]
    kind: docs-clarification
    affected: ['DELETE /v1/rebalancing/portfolios/{portfolio_id}']
    url: https://docs.alpaca.markets/us/changelog/2026-07-20-portfolio-archive-90d3cf9
  - date: '2026-07-20'
    title: '"fractionable" field added to US treasury and corporate bond schemas'
    apis: [Broker API]
    kind: addition
    affected: ['GET /v1/assets/fixed_income/us_corporates', 'GET /v1/assets/fixed_income/us_treasuries']
    url: https://docs.alpaca.markets/us/changelog/2026-07-20-fractionable-56627af
  - date: '2026-07-20'
    title: Portfolio history numeric fields can be null
    apis: [Broker API, Trading API]
    kind: schema-change
    affected: ['GET /v1/trading/accounts/{account_id}/account/portfolio/history', 'GET /v2/account/portfolio/history']
    highlights:
      - equity, profit_loss, profit_loss_pct, and base_value on PortfolioHistory are now nullable to match service behavior.
    url: https://docs.alpaca.markets/us/changelog/2026-07-20-portfolio-history-09b0f9f
  - date: '2026-07-20'
    title: New Corporate Actions events streaming endpoint (SSE)
    apis: [Market Data API]
    kind: addition
    affected: ['GET /v1beta1/events/corporate-actions']
    highlights:
      - Streams cash/stock dividends, splits, mergers, spin-offs, reorganizations, rights, redemptions, name changes, and more; filter by event type/region; replay via since/until and event-id cursors.
    url: https://docs.alpaca.markets/us/changelog/2026-07-20-corporate-actions-b7b8e98