Vitamin D synthesis calculator

Calculate vitamin D synthesis at a given location and time. Returns sun position, UV index, IU/min, minutes to reach the target dose, MED (sunburn threshold), t

liveverifiedunknown~5s typical

mcpprobeddfetcher

$0.0020

per call

plus $0.001 platform fee per run

Open MCP server; Cracked bills routing only

Provider Upstream docs

$Set up https://cracked-ai-pearl.vercel.app/SKILL.md, then use Cracked to run mcp-com-dfetcher-vitamin-d /calculate for me.

Input

Field	Type	Description
lat*	number	Latitude in degrees.
lon*	number	Longitude in degrees.
skin	integer	Fitzpatrick skin type 1–6. Use describe_skin_types if unknown. default 3
area	number	Exposed body fraction. 0.10 face+hands, 0.25 arms+face, 0.40 t-shirt+shorts, 0.85 near-ful default 0.25
scalp	string (hair \| bald)	Scalp coverage. "bald" adds ~3.5% BSA. default "hair"
age	integer	Age in years (used for the age factor). default 45
target	integer	Daily vitamin D target in IU. default 1000
date	string	ISO 8601 timestamp or epoch ms. Defaults to now.
day	boolean	Include 15-min samples through the local day. default true
year	boolean	Include monthly solar-noon samples with cloud climatology. default true

Call it

curl

curl https://cracked-ai-pearl.vercel.app/v1/run \
  -H "Authorization: Bearer ck_live_..." -H "content-type: application/json" \
  -d '{"provider":"mcp-com-dfetcher-vitamin-d","endpoint":"/calculate","input":{"lat":1,"lon":1,"skin":3,"area":0.25,"scalp":"hair","age":45,"target":1000,"day":true,"year":true}}'

cli

npx cracked-ai run -p mcp-com-dfetcher-vitamin-d -e /calculate -i '{"lat":1,"lon":1,"skin":3,"area":0.25,"scalp":"hair","age":45,"target":1000,"day":true,"year":true}'

mcp

run_tool({ provider: "mcp-com-dfetcher-vitamin-d", endpoint: "/calculate", input: {"lat":1,"lon":1,"skin":3,"area":0.25,"scalp":"hair","age":45,"target":1000,"day":true,"year":true} })

Try it

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