> ## Documentation Index > Fetch the complete documentation index at: https://docs.coinversa.ai/llms.txt > Use this file to discover all available pages before exploring further. # L4 order 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. ## OpenAPI ````yaml /api-reference/openapi.json get /api/public/v1/market/book/coverage openapi: 3.1.0 info: title: coinversa-api version: 0.1.0 servers: - url: https://api.coinversa.ai description: Production security: [] paths: /api/public/v1/market/book/coverage: get: tags: - Market summary: L4 order book coverage description: >- 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. operationId: get-api-public-v1-market-book-coverage responses: '200': content: application/json: schema: $ref: '#/components/schemas/BookCoverageBody' description: OK headers: X-Billing-Grace-Expires: $ref: '#/components/headers/X-Billing-Grace-Expires' X-Billing-State: $ref: '#/components/headers/X-Billing-State' X-RateLimit-Daily: $ref: '#/components/headers/X-RateLimit-Daily' X-RateLimit-Daily-Reset: $ref: '#/components/headers/X-RateLimit-Daily-Reset' X-RateLimit-Monthly: $ref: '#/components/headers/X-RateLimit-Monthly' X-RateLimit-Monthly-Reset: $ref: '#/components/headers/X-RateLimit-Monthly-Reset' X-RateLimit-Next: $ref: '#/components/headers/X-RateLimit-Next' X-RateLimit-Remaining: $ref: '#/components/headers/X-RateLimit-Remaining' X-RateLimit-Reset: $ref: '#/components/headers/X-RateLimit-Reset' X-RateLimit-Route: $ref: '#/components/headers/X-RateLimit-Route' X-RateLimit-Scope: $ref: '#/components/headers/X-RateLimit-Scope' X-RateLimit-Tier: $ref: '#/components/headers/X-RateLimit-Tier' X-Request-ID: $ref: '#/components/headers/X-Request-ID' '400': content: application/problem+json: schema: $ref: '#/components/schemas/APIError' description: Bad Request headers: X-Request-ID: $ref: '#/components/headers/X-Request-ID' '403': content: application/problem+json: schema: $ref: '#/components/schemas/APIError' description: Forbidden headers: X-Request-ID: $ref: '#/components/headers/X-Request-ID' '429': content: application/problem+json: schema: $ref: '#/components/schemas/APIError' description: Too Many Requests headers: Retry-After: $ref: '#/components/headers/Retry-After' X-Billing-Grace-Expires: $ref: '#/components/headers/X-Billing-Grace-Expires' X-Billing-State: $ref: '#/components/headers/X-Billing-State' X-RateLimit-Daily: $ref: '#/components/headers/X-RateLimit-Daily' X-RateLimit-Daily-Reset: $ref: '#/components/headers/X-RateLimit-Daily-Reset' X-RateLimit-Monthly: $ref: '#/components/headers/X-RateLimit-Monthly' X-RateLimit-Monthly-Reset: $ref: '#/components/headers/X-RateLimit-Monthly-Reset' X-RateLimit-Next: $ref: '#/components/headers/X-RateLimit-Next' X-RateLimit-Remaining: $ref: '#/components/headers/X-RateLimit-Remaining' X-RateLimit-Reset: $ref: '#/components/headers/X-RateLimit-Reset' X-RateLimit-Route: $ref: '#/components/headers/X-RateLimit-Route' X-RateLimit-Scope: $ref: '#/components/headers/X-RateLimit-Scope' X-RateLimit-Tier: $ref: '#/components/headers/X-RateLimit-Tier' X-Request-ID: $ref: '#/components/headers/X-Request-ID' '500': content: application/problem+json: schema: $ref: '#/components/schemas/APIError' description: Internal Server Error headers: X-Request-ID: $ref: '#/components/headers/X-Request-ID' '504': content: application/problem+json: schema: $ref: '#/components/schemas/APIError' description: Gateway Timeout headers: X-Request-ID: $ref: '#/components/headers/X-Request-ID' security: - apiKey: [] components: schemas: BookCoverageBody: additionalProperties: false properties: $schema: description: A URL to the JSON Schema for this object. examples: - https://api.coinversa.ai/schemas/BookCoverageBody.json format: uri readOnly: true type: string age_s: format: int64 type: integer coins: format: int64 type: integer latest_block_time: type: string latest_height: format: int64 type: integer notes: items: type: string type: - array - 'null' oldest_block_time: type: string source: type: string stale: type: boolean required: - coins - latest_height - latest_block_time - oldest_block_time - age_s - stale - source - notes type: object APIError: additionalProperties: false properties: $schema: description: A URL to the JSON Schema for this object. examples: - https://api.coinversa.ai/schemas/APIError.json format: uri readOnly: true type: string code: description: Machine-readable error code; retained for compatibility. type: string current_tier: description: Caller's effective tier type: string detail: description: >- A human-readable explanation specific to this occurrence of the problem. examples: - Property foo is required but is missing. type: string errors: description: Optional list of individual error details items: $ref: '#/components/schemas/ErrorDetail' type: - array - 'null' instance: description: >- A URI reference that identifies the specific occurrence of the problem. examples: - https://example.com/error-log/abc123 format: uri type: string reason: description: >- More specific recovery reason when available: missing_api_key, invalid_api_key, insufficient_tier, or invalid_parameters. HTTP statuses and legacy code values remain unchanged. type: string required_tier: description: Minimum tier for this operation type: string status: description: HTTP status code examples: - 400 format: int64 type: integer title: description: >- A short, human-readable summary of the problem type. This value should not change between occurrences of the error. examples: - Bad Request type: string type: default: about:blank description: A URI reference to human-readable documentation for the error. examples: - https://example.com/errors/example format: uri type: string upgrade_url: description: Where to upgrade type: string type: object ErrorDetail: additionalProperties: false properties: location: description: >- Where the error occurred, e.g. 'body.items[3].tags' or 'path.thing-id' type: string message: description: Error message text type: string value: description: The value at the given location type: object headers: X-Billing-Grace-Expires: description: RFC3339 time when billing grace expires, when applicable. schema: type: string X-Billing-State: description: Billing grace state, when applicable. schema: type: string X-RateLimit-Daily: description: >- Daily account allowance reported by the existing counter check, clamped at zero. Best-effort; present only for a capped tier that reaches the quota check. schema: type: string X-RateLimit-Daily-Reset: description: >- Unix seconds (UTC) after the selected daily quota bucket expires. Not a source-data timestamp. schema: type: string X-RateLimit-Monthly: description: >- Monthly account allowance reported by the existing counter check, clamped at zero. Best-effort; present only for a capped tier that reaches the quota check. schema: type: string X-RateLimit-Monthly-Reset: description: >- Unix seconds (UTC) after the selected monthly quota bucket expires. Follows the existing billing anchor. schema: type: string X-RateLimit-Next: description: >- Legacy Go duration string until the next token is available across the checked buckets; not the daily/monthly reset. schema: type: string X-RateLimit-Remaining: description: >- Minimum remaining tokens across the checked minute and per-route token buckets (account for keys, IP for anonymous requests). Not a fixed-window request allowance. schema: type: string X-RateLimit-Reset: description: >- Unix seconds (UTC), rounded up, when the checked token buckets next permit a request, assuming no competing traffic. Not a full bucket refill. schema: type: string X-RateLimit-Route: description: Remaining tokens in the account's per-route token bucket. schema: type: string X-RateLimit-Scope: description: >- account for authenticated requests (shared across keys); ip for anonymous requests. Describes the limiter scope, not the key's resolved tier. schema: type: string X-RateLimit-Tier: description: Effective tier for this request; only present after access checks pass. schema: type: string X-Request-ID: description: >- Server-generated correlation ID. Include it in a support report; not a guarantee that an unauthenticated request appears in account usage logs. schema: type: string Retry-After: description: >- On HTTP 429, whole seconds to wait before retrying, rounded up. Other traffic may still consume the available allowance. schema: type: string securitySchemes: apiKey: description: >- Create an API key at https://developers.coinversa.ai/keys. REST limits are shared across keys by account; access uses the effective tier of the presented key. in: header name: X-API-Key type: apiKey ````