# D Fetcher

**Canonical:** https://apis.io/providers/dfetcher-com/  
**Website:** https://dfetcher.com/  
**APIs profiled:** 2

D Fetcher provides a simple web calculator and open JSON API to estimate how long you need sun exposure to achieve a target vitamin D dose. It uses real‑time UV index data, location lookup, skin type, body surface area and age to compute minutes of sunlight needed. The service is free, CORS‑open, and requires no API key, making it easy to integrate into health apps, wearables, or personal dashboards.

## Kin Score — 17.1 / 100 (emerging)

Scored 2026-11-06 under rubric 0.27.0.

| Facet | Score |
|---|---|
| Discoverability | 56.7 |
| Contract Quality | 9.4 |
| Contract Governance | 22.0 |
| Operational Transparency | 15.8 |
| Developer Ergonomics | 11.9 |
| Access Clarity | 10.5 |

Regulatory layer — **Health**: 11.7 (matched via tags).

## Agent readiness — 16.4 (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 | no |
| 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 |
| MCP Tool Quality | na |

## Access

Open access — onboarding: open, pricing: unknown, trial: no (confidence: low).

## APIs (2)

- **D Fetcher API** — JSON API for the D Fetcher vitamin D synthesis calculator.
- **D Fetcher API** — D Fetcher API as documented publicly: 1 operations. Contract generated from the documentation by API Evangelist (2026-11-05); not the provider's own document.

## MCP servers (1)

- **D Fetcher MCP Server** — Remote MCP server at dfetcher.com.

## Security (1)

- **Dfetcher Com Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Vitamin D, Health, Calculator, OpenAPI, Free

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