---
title: "Archive Coverage Gap"
method: POST
path: "/archive/coverage-gap"
---

# Archive Coverage Gap

`POST /archive/coverage-gap`

## Request

- Base URL: `https://api.colourmemory.com` (the document declares no server; this is the origin it was published from)
- URL: `https://api.colourmemory.com/archive/coverage-gap`
- Auth: none declared

Given a list of themes, report which are well-evidenced in the archive
and which are under-evidenced or missing.

Returns a coverage matrix: for each theme, the number of matching entries,
the strongest entry, the claim_strength of the best match, and what kind
of source would be needed to improve coverage.

Use this before building an archive_report_brief to know where the
evidence is strong and where the agent will have to flag gaps.

## Headers

- `x-api-key` string, nullable
- `origin` string, nullable

## Request body

- CoverageGapRequest
  - `themes` string[], required
  - `archives` string[]
  - `period_start` integer
  - `period_end` integer

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/colourmemory/apis/colour-memory-api.md) · [All operations](https://skmtc.dev/colourmemory/apis/colour-memory-api/llms.txt) · [OpenAPI document](https://skmtc.dev/colourmemory/apis/colour-memory-api/revisions/4ba028f64042?raw)