# Hardcover

**Canonical:** https://apis.io/providers/hardcover/  
**Website:** https://hardcover.app/  
**APIs profiled:** 2

Hardcover is a social discovery platform for serious book lovers, offering a mobile app and web experience where users can track, share, and explore books. The service lets readers build personal libraries, follow others, discover new reads, and engage with community features such as Discord, blog posts, and public roadmaps. Hardcover provides a GraphQL API for developers to access book data, user progress, and community content, documented at docs.hardcover.app with guides, reference, and SDKs.

## Kin Score — 37.3 / 100 (thin)

Scored 2026-10-31 under rubric 0.25.0.

| Facet | Score |
|---|---|
| Discoverability | 66.1 |
| Contract Quality | 17.8 |
| Contract Governance | 22.0 |
| Operational Transparency | 52.6 |
| Developer Ergonomics | 70.7 |
| Access Clarity | 0.0 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 32.4 (matched via fallback).

## Agent readiness — 31.0 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | served |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | unknown |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | served |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | distinct |

## APIs (2)

- **Hardcover GraphQL API** — GraphQL API for accessing book data, user progress, and community content.
- **Hardcover API** — Hardcover API as documented publicly: 4 operations. Contract generated from the documentation by API Evangelist (2026-10-28); not the provider's own document.

## Security (3)

- **Hardcover Authentication** — 2 schemes
- **Hardcover Domain Security** — TLSv1.3 · HSTS · DMARC
- **Hardcover Vulnerability Disclosure** — security.txt · contact published

## Tags

Company, Social, Book, Reading, Community, API

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/hardcover/). Scores are computed from the provider's own public artifacts under a published rubric.