First Letter / Cornerstone
The Cornerstone is the first letter of the given name. In numerology, it is the most influential letter, shaping how a person approaches new beginnings, challenges, and opportunities. Returns the letter's numeric value, planet, and detailed meaning.
Required: dob, name
Optional: system
Returns: First letter, its Chaldean value, ruling planet, element, traits, and bilingual interpretation.
Example request
cURL
curl -X POST https://api.grahaapi.com/v1/numerology/first-letter \
-H "Authorization: Bearer sk-test-your-key" \
-H "Content-Type: application/json" \
-d '{
"dob": "1990-05-15",
"name": "Rahul Sharma",
"system": "chaldean"
}'Test keys (sk-test-…) are free and unlimited, and return the exact production response structure computed from a fixed sample input. The response is JSON: {"success": true, "data": {…}, "meta": {…}} with Hindi name twins where available (e.g. sign / sign_hi).
Request fields
| Field | Type | Required | Description |
|---|---|---|---|
dob | string | required | Date of birth in YYYY-MM-DD format |
name | string | optional | Full name (optional — needed for name-based calculations) |
system | string | optional | Numerology system — 'chaldean' (Vedic/traditional, recommended) or 'pythagorean' (Western) |
Example body
JSON
{
"dob": "1990-05-15",
"name": "Rahul Sharma",
"system": "chaldean"
}