---
title: "H.3 - Aggregate Reserves of Depository Institutions"
method: GET
path: "/api/v1/fed/h3"
tags: ["Central Banks & Monetary"]
---

# H.3 - Aggregate Reserves of Depository Institutions

`GET /api/v1/fed/h3`

Federal Reserve H.3 statistical release (weekly Thursday). Reserve balances, borrowings, and total reserves of depository institutions. Post-2020 reserve-requirement reduction to zero retired several legacy series; discontinued series are available via include_discontinued=true. Data drawn live from FRED with 1-hour cache.

## Query parameters

- `lookback_weeks` integer — Weeks of history to return (default 52, max 260).
- `include_discontinued` boolean — When true, include discontinued and superseded series in the response. Default false returns only release_status=active series.

## Response `200`

H.3 weekly observation grid with series_metadata + failed_series envelope.

- EnvelopeFedH3Data
  - `data` FedH3Data, required
    - `release_date` string, nullable — FRED release publish date if known, otherwise null. The B3 endpoints currently leave this null and use latest_observation_date for freshness.
    - `latest_observation_date` string, nullable — Max observation_date across active series.
    - `series_metadata` FedReleaseSeriesMetadata[], required
      - `series_id` string, required
      - `title` string, required
      - `units` string, required
      - `frequency` string, required
      - `seasonally_adjusted` boolean, required
      - `release_status` string, required — One of: active, discontinued, superseded.
      - `last_updated` string, nullable — ISO 8601 timestamp from FRED metadata. Null when not retrieved.
      - `last_observation_date` string, nullable — Latest observation date for this series, ISO 8601.
      - `superseded_by` string, nullable — Replacement series ID when release_status=superseded.
    - `failed_series` string[] — Series whose fetch failed (network, 404, parse error). Distinct from legitimate null observations inside snapshots. Empty list = full success.
    - `weekly_data` FedReleaseSnapshot[], required
      - `observation_date` string, required
      - `series` object, required — Map series_id -> numeric value or null.
  - `meta` SugraMeta, required — Metadata attached to every /api/v1/* response envelope.
    - `endpoint` string, required — Requested endpoint path.
    - `data_time` string, required — ISO 8601 UTC timestamp of the source data, not of the request.
    - `response_time` string, required — ISO 8601 UTC timestamp when this response was produced.
    - `provider` string, required — API name and version.
    - `source` string, nullable — Identifier of the primary upstream source used for this response.
    - `attribution` string, nullable — Human-readable attribution mandated by an upstream source (e.g. a securities regulator or self-regulatory organization). Present only on responses whose source requires the owner and source to be clearly identified. Do not remove or alter it when using the response.
    - `fallback_used` boolean, nullable — True when the primary source failed and a fallback produced the data.
    - `fallback_chain` string[], nullable — Ordered list of sources attempted, in the order they were tried.
    - `cached` boolean, nullable — True when this response was served from the internal cache.
    - `stale` boolean, nullable — True when the cached response was returned after the upstream rate-limited or errored. Clients can use this to detect degraded data.

## Other responses

- `401` — Missing or invalid `x-api-key` header. JSON body with a stable `code` distinguishing `missing_api_key` (no header sent) from `invalid_api_key` (header sent, key not accepted); any other 401 source carries the generic `unauthorized` with its detail as `reason`. Plus `hint`. `plan` is always null on 401 - an unauthenticated request has no plan; quota exhaustion is 429, not 401.
- `422` — Validation Error
- `429` — Daily rate limit exceeded. Check `X-RateLimit-Reset` for the next window.
- `503` — Upstream source is temporarily unavailable. Retry after a short delay.

---

[API](https://skmtc.net/sugra/apis/sugra-api.md) · [All operations](https://skmtc.net/sugra/apis/sugra-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/sugra/sugra-api/versions/4c4530760ba1/schema)