---
title: "Read the public primary-source occurrence and population-reference catalog"
method: GET
path: "/api/v1/event-rates"
---

# Read the public primary-source occurrence and population-reference catalog

`GET /api/v1/event-rates`

## Request

- Base URL: `https://probable.media`
- URL: `https://probable.media/api/v1/event-rates`
- Auth: none declared

Returns seven count/exposure references, SSA mortality lookup metadata, and populationReferences containing the full eight NHTSA, BLS, and CDC series. Each population series includes its latest point and a descriptive comparison with priorYear, priorValue, change, and relativeChange. Source hashes, vintages, definitions, limitations, and refresh policies remain public. News and editorial contributions are zero; published cohort and age-adjusted rates are never averaged or ranked across incompatible units.

## Response `200`

Public occurrence catalog with references and full populationReferences

- object
  - `references` object[]
  - `populationReferences` PopulationReferenceCatalogItem[]
    - `id` string, required
    - `title` string, required
    - `publisher` string, required
    - `population` string, required
    - `countryCode` 'USA', required
    - `countryName` 'United States', required
    - `kind` 'cohort_survival' | 'mortality_rate' | 'road_fatality_rate', required
    - `unit` string, required
    - `methodology` string, required
    - `dimensions` object, required
    - `points` object[], required
      - `year` integer, required
      - `value` number, required
      - `numerator` number
      - `denominator` number
      - `cohortYear` integer
      - `provisional` boolean
    - `sources` object[], required
    - `limitations` string, required
    - `refreshPolicy` 'source_release_import', required
    - `latest` object, required
      - `year` integer, required
      - `value` number, required
      - `numerator` number
      - `denominator` number
      - `cohortYear` integer
      - `provisional` boolean
    - `comparison` object, nullable, required
      - `priorYear` integer, required
      - `priorValue` number, required
      - `change` number, required
      - `relativeChange` number, nullable, required
      - `interpretation` string, required: Descriptive source-period difference, not a significance test or forecast.
    - `newsContribution` 0, required
    - `editorialContribution` 0, required
    - `comparableAcrossReferences` false, required

---

[API](https://skmtc.dev/probable/apis/probable-public-api.md) · [All operations](https://skmtc.dev/probable/apis/probable-public-api/llms.txt) · [OpenAPI document](https://skmtc.dev/probable/apis/probable-public-api/revisions/28e1acd459f3?raw)