> ## Documentation Index
> Fetch the complete documentation index at: https://acaas.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Changelog

> Every change shipped to ACAAS, in reverse chronological order.

ACAAS is in public beta. Behavior may shift between minor versions; breaking
changes are called out explicitly. Subscribe to the
[RSS feed](/changelog.rss) to get notified when anything ships.

<Update label="2026-04-22" description="v0.1.3" tags={["New endpoint", "Improvement"]}>
  ## Rate limit introspection

  Added [`GET /v1/rate-limits`](/api-reference/rate-limits) so callers can
  inspect their current quota without spending a request. The response
  includes `requests_remaining`, `resets_in_seconds`, and a categorical
  `status` (`ok`, `approaching_limit`, `at_limit`).

  Authenticated responses now also include the `X-RateLimit-Remaining` and
  `X-RateLimit-Reset` headers, so you do not need a separate call to know
  where you stand.

  See the new [Rate limiting guide](/rate-limiting) for the full ladder
  and proactive pacing patterns.
</Update>

<Update label="2026-04-08" description="v0.1.2" tags={["Experimental", "Improvement"]}>
  ## Tunable emphasis ratio

  `/v1/emphasize` now accepts an `emphasis_ratio` parameter between just
  above `0` and `1.0`, defaulting to `0.3`. Lower values produce sparser
  highlights; higher values are more generous.

  The emphasis model itself was retrained on a corpus of release notes,
  product announcements, and headlines. Output is meaningfully more useful
  for short text and slightly more verbose for very long input.

  Behavior remains non-deterministic. See
  [Experimental emphasis](/experimental-emphasis) for guidance on when
  and when not to depend on this endpoint.
</Update>

<Update label="2026-03-20" description="v0.1.1" tags={["Bug fix"]}>
  ## Whisper response shape

  Fixed a bug where `/v1/whisper` returned `characters_amplified: 0` for
  any input that was already lowercase. The field now correctly reports
  the count of characters whose case changed, regardless of direction.

  Fixed a regression where `/v1/scream` with `intensity: 1` occasionally
  appended two exclamation marks instead of one. The villain has been
  dispatched.
</Update>

<Update label="2026-03-05" description="v0.1.0" tags={["New endpoint", "Breaking change"]}>
  ## Public beta launch

  ACAAS is now generally available in public beta. All six endpoints are
  live:

  * `POST /v1/shout` — uppercase a string.
  * `POST /v1/scream` — uppercase with configurable exclamation intensity.
  * `POST /v1/whisper` — the quiet cousin. Returns lowercase.
  * `POST /v1/emphasize` — experimental. A model picks which words to bold.
  * `GET /v1/health` — service health. No auth required.
  * `GET /v1/rate-limits` — quota introspection.

  **Breaking change from the private alpha.** Authentication moved from the
  `Authorization: Bearer` header to a dedicated `X-API-Key` header. Update
  any pre-launch integrations accordingly.

  Request bodies are now capped at 10,000 characters. Larger payloads
  return `413 Payload Too Large`.

  Start with the [Quickstart](/quickstart) or jump straight to the
  [API reference](/api-reference/shout).
</Update>