---
title: "Fama-French US portfolio returns"
method: GET
path: "/api/v1/fama-french/us-portfolio"
tags: ["Finance"]
---

# Fama-French US portfolio returns

`GET /api/v1/fama-french/us-portfolio`

US-equity sorted/industry portfolio returns from the Ken French Data Library. Pick a portfolio file (e.g. portfolios_formed_on_me, 6_portfolios_2x3, 25_portfolios_5x5, 49_industry_portfolios), a measure (value / equal weighted returns, number_of_firms, firm_size) and a frequency (monthly / annual). Daily and weekly portfolio files return their native frequency. See /fama-french/portfolio-catalog for the 119 valid portfolio labels.

## Query parameters

- `portfolio` string — US portfolio label.
- `measure` string — value, equal, number_of_firms, firm_size
- `frequency` string — monthly, annual (ignored for daily/weekly files)
- `limit` integer — Number of most-recent periods.

## Response `200`

Wide records: one row per period with a column per portfolio formation.

- EnvelopeStubData
  - `data` StubData, required — Response shape not yet documented; fields are returned as-is.
  - `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.

---

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