POST /v1/numerology/first-letter
**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.
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 chart. The response is JSON: {"success": true, "data": {…}, "meta": {…}} with Hindi + English strings, computed on the Lahiri ayanamsa.
| Field | Type | Required | Description |
|---|---|---|---|
dob | string | ✅ | Date of birth in YYYY-MM-DD format |
name | string | — | Full name (optional — needed for name-based calculations) |
system | string | — | Numerology system — 'chaldean' (Vedic/traditional, recommended) or 'pythagorean' (Western) |
{
"dob": "1990-05-15",
"name": "Rahul Sharma",
"system": "chaldean"
}Get a free API key Try it in the playground
/v1/numerology/bhagyank · /v1/numerology/bridge-number · /v1/numerology/business-compatibility · /v1/numerology/career · /v1/numerology/challenge-numbers · /v1/numerology/child