---
title: "Track caliber popularity over time"
method: GET
path: "/v1/stats/caliber-popularity-by-era"
tags: ["Statistics"]
---

# Track caliber popularity over time

`GET /v1/stats/caliber-popularity-by-era`

## Request

- Base URL: `https://api.gunspec.io`
- URL: `https://api.gunspec.io/v1/stats/caliber-popularity-by-era`
- Auth: one of:
  - API key in header `X-API-Key`
  - HTTP bearer

Returns how often each cartridge was chambered per period, for charting which calibers rose and fell.

**Requires Studio tier or higher.**

## Query parameters

- `from_decade` string
- `to_decade` string

## Response `200`

Track caliber popularity over time

- object
  - `success` boolean, required: Always true on a successful response. Every error carries `false` and an `error` object instead.
  - `data` object[], required: The response payload.
    - `decade` string: The decade this row covers, e.g. `1940s`.
    - `calibers` object[]: The cartridges chambered by firearms introduced in this decade.
      - `caliberId` string: Slug of the cartridge. Resolve against `/v1/calibers/{id}`.
      - `caliberName` string: Display name of the cartridge.
      - `firearmCount` integer: How many firearms this row covers.

## Other responses

- `400`: Validation error
- `401`: Missing or invalid API key
- `403`: The credential is valid and the caller is not permitted. Three causes, none of which reissuing a key changes: the plan is below the endpoint's tier, the account is suspended, or the key is not attached to the thing being acted on, meaning a user account for `/v1/me` or a shop for `/v1/vendor`. Distinct from 401, which means the credential is missing, malformed or expired and a new one can work.
- `429`: A limit was reached. `RATE_LIMITED` is the per-minute limit: wait `Retry-After` seconds (a minute) and retry. `DAILY_CAP_EXCEEDED` is the plan's daily limit, per key: nothing will be served until the counters return to zero at midnight UTC. `MONTHLY_CAP_EXCEEDED` is the plan's monthly allowance, for the whole account: nothing will be served until midnight UTC on the first of next month, or until the plan changes. For both, `Retry-After` is the seconds until then and `error.resetsAt` says when as an instant. Calls made after a refusal are refused too and do not spend the month, and a free key that keeps calling is paused, so stop at the first one and resume at the reset.
- `500`: Internal server error

---

[API](https://skmtc.dev/gunspec/apis/gunspec-io-api.md) · [All operations](https://skmtc.dev/gunspec/apis/gunspec-io-api/llms.txt) · [OpenAPI document](https://skmtc.dev/gunspec/apis/gunspec-io-api/revisions/f2e974d8b05c?raw)