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Documentation Index

Fetch the complete documentation index at: https://docs.humandesignapi.nl/llms.txt

Use this file to discover all available pages before exploring further.

All v2 endpoints require your API key as a Bearer token: 
Authorization: Bearer YOUR_API_KEY

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Geocoding Key

Location-based endpoints (/v2/charts and /v2/charts/simple) additionally require a Google Geocoding API key: 
HD-Geocode-Key: YOUR_GEOCODE_KEY
This key is used to convert location strings (e.g., “Amsterdam, The Netherlands”) into geographic coordinates. You can get one from the Google Cloud Console.
The coordinates endpoint (/v2/charts/coordinates) does not need a geocoding key. If you already have latitude and longitude, use it to skip geocoding entirely.

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Full Request Example

curl -X POST https://api.humandesignapi.nl/v2/charts/simple \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "HD-Geocode-Key: YOUR_GEOCODE_KEY" \
  -d '{
    "birthdate": "1990-01-15",
    "birthtime": "14:30",
    "location": "Amsterdam, The Netherlands"
  }'

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v1 Authentication (Legacy)

v1 uses a different header format. New integrations should use v2. See the migration guide.
v1 endpoints require two custom headers: 
HD-Api-Key: YOUR_API_KEY
HD-Geocode-Key: YOUR_GEOCODE_KEY
The same API key works for both v1 and v2 — only the header name changes.

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Access Tiers

Your plan determines which endpoints you can access:
TierEndpointsPlans
Basic/v2/charts/simple, /v1/bodygraphs/simpleHobbyist
AdvancedAll endpoints (including /v2/charts, /v2/charts/coordinates, /v1/bodygraphs)Developer, Scale, Lifetime
Calling an endpoint above your tier returns 403 with error code ACCESS_DENIED.

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API Key Security

Keep your API key secret. Never expose it in client-side code, public repositories, or browser requests.
  • Your API key is available in the dashboard
  • If your key is compromised, rotate it immediately from the dashboard. The old key is invalidated instantly
  • Each API call deducts one credit from your plan’s allocation

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Authentication Errors

Error CodeStatusDescription
API_KEY_MISSING401No Authorization header provided
API_KEY_INVALID401API key not found or deactivated
GEOCODE_KEY_MISSING401No HD-Geocode-Key header on a location-based endpoint
GEOCODE_KEY_INVALID400Google Geocoding API key is invalid or restricted
ACCESS_DENIED403Your plan does not include this endpoint
ACCOUNT_INACTIVE403Account has been deactivated