# mCaptcha

**Canonical:** https://apis.io/providers/mcaptcha/  
**Website:** https://mcaptcha.org/  
**APIs profiled:** 1

mCaptcha provides a proof‑of‑work based captcha system that is privacy‑focused, fully automated, and open source. It protects websites from automated abuse without tracking users, offering a silent, user‑friendly experience. The service includes drop‑in compatibility with reCAPTCHA and hCaptcha, extensive documentation, and client libraries under permissive licenses, while the core remains AGPL‑licensed.

## Kin Score — 29.9 / 100 (thin)

Scored 2026-10-31 under rubric 0.25.0.

| Facet | Score |
|---|---|
| Discoverability | 66.1 |
| Contract Quality | 29.0 |
| Contract Governance | 4.5 |
| Operational Transparency | 15.8 |
| Developer Ergonomics | 52.4 |
| Access Clarity | 10.5 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 20.6 (matched via fallback).

## Agent readiness — 18.9 (agent-aware)

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

## APIs (1)

- **mCaptcha Guard API** — API for mCaptcha user registration, authentication, and account management.

## Security (2)

- **Mcaptcha Domain Security** — TLSv1.3 · DNSSEC
- **Mcaptcha Vulnerability Disclosure** — no policy recorded

## Tags

Company, Captcha, Privacy, OpenSource, PoW, Security

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