---
title: "L4 order book coverage"
method: GET
path: "/api/public/v1/market/book/coverage"
tags: ["Market"]
---

# L4 order book coverage

`GET /api/public/v1/market/book/coverage`

How fresh the L4 order-book rollups are: coins covered, the newest L1 block height and block time, the age of the freshest row and whether the source is stale. Returns no book data, so it is free — this is the `book` dataset behind the MCP's data_coverage tool.

## Response `200`

OK

- BookCoverageBody
  - `$schema` string, uri — A URL to the JSON Schema for this object.
  - `age_s` integer, required
  - `coins` integer, required
  - `latest_block_time` string, required
  - `latest_height` integer, required
  - `notes` string[], nullable, required
  - `oldest_block_time` string, required
  - `source` string, required
  - `stale` boolean, required

## Other responses

- `400` — Bad Request
- `403` — Forbidden
- `429` — Too Many Requests
- `500` — Internal Server Error
- `504` — Gateway Timeout

## Changes

- **2026-09-23** `f2eba29805e5` — 6 info
  - added the non-success response with the status `403`
  - removed the non-success response with the status `401`
  - added the optional property `reason` to the response with the `400` status
  - added the optional property `reason` to the response with the `429` status
  - …2 more
- **2026-09-17** `d38edae62711` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/coinversa/apis/coinversa-api/changes/api/public/v1/market/book/coverage/get.md)

---

[API](https://skmtc.dev/coinversa/apis/coinversa-api.md) · [All operations](https://skmtc.dev/coinversa/apis/coinversa-api/llms.txt) · [OpenAPI document](https://skmtc.dev/coinversa/apis/coinversa-api/revisions/f2eba29805e5?raw)