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AstroWay Calculation API

Swiss Ephemeris powered astrology calculations via REST API. Natal charts, synastry, transits, progressions, planetary hours, retrograde periods and more.

Base URL

https://api-calc.astroway.info/api/v1

Authentication

X-Api-Key: your_key

Response Format

{ "ok": true, "data": {...} }

Authentication

All endpoints (except /health) require an API key in the X-Api-Key header.

Plans:

Free — 60 requests/min
Pro — 300 requests/min
Enterprise — 10,000 requests/min

Rate limit exceeded returns 429 with Retry-After header.

Required fields

date — birth date YYYY-MM-DD
time — birth time HH:mm:ss
timezoneOffset — hours from UTC (e.g. 3 for UTC+3)
latitude, longitude — required for houses, aspects, progressions, returns. Not needed for /planets

URL aliases

/void-of-course → /moon-voc · /harmonic → /harmonics

Quick Start

Get Moon sign for a birth date in 3 lines:

curl -X POST https://api-calc.astroway.info/api/v1/planets \
  -H "X-Api-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"date": "1990-05-15", "time": "14:30:00", "timezoneOffset": 3}'

Response includes Moon longitude (e.g. 296.9° = Capricorn), plus all other planets with positions, speeds, declinations and retrograde status.

Full natal chart with houses and aspects:

curl -X POST https://api-calc.astroway.info/api/v1/chart \
  -H "X-Api-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"date": "1990-05-15", "time": "14:30:00", "timezoneOffset": 3,
       "latitude": 50.45, "longitude": 30.52, "houseSystem": "P"}'

Mercury retrograde periods for 2026:

curl -X POST https://api-calc.astroway.info/api/v1/retrograde-periods \
  -H "X-Api-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"startDate": "2026-01-01", "endDate": "2026-12-31", "planetIds": [2]}'

Usage Dashboard

Every API key has a personal usage dashboard. Open it in a browser to see a visual stats page, or fetch JSON programmatically.

Browser (HTML dashboard)

https://api-calc.astroway.info/api/v1/status?key=YOUR_API_KEY

Force JSON

https://api-calc.astroway.info/api/v1/status?key=YOUR_API_KEY&format=json

Force HTML

https://api-calc.astroway.info/api/v1/status?key=YOUR_API_KEY&format=html

The dashboard shows: requests today / 7 days / 30 days, rate limits with usage bars, daily chart, top endpoints by usage, key metadata (plan, rate limit, creation date). No authentication header needed — the key in the URL is the auth.

Fetch specific sections

Use the section parameter to get only the data you need:

Parameter	Returns	Example
`section=limits`	Plan, rate limit, daily/monthly capacity, usage %	`{ "plan": "free", "requestsPerMinute": 60, "usagePercent": { "today": 5 } }`
`section=usage`	Request counts: today, 7 days, 30 days	`{ "today": 42, "week": 285, "month": 1250 }`
`section=endpoints`	Top endpoints by usage (30 days)	`[{ "endpoint": "planets", "total": 800 }]`
`section=daily`	Daily request counts (30 days)	`[{ "date": "2026-03-19", "count": 42 }]`
`section=key`	Key metadata (name, plan, created, last used)	`{ "name": "My App", "plan": "free", ... }`

# Get only rate limits
curl "https://api-calc.astroway.info/api/v1/status?key=YOUR_API_KEY&section=limits"

# Get only usage counters
curl "https://api-calc.astroway.info/api/v1/status?key=YOUR_API_KEY&section=usage"

Error Codes

HTTP	Code	Description
400	`MISSING_FIELDS`	Required fields missing
400	`INVALID_INPUT`	Invalid date/time format
401	`MISSING_API_KEY`	No X-Api-Key header
401	`INVALID_API_KEY`	Key not found or inactive
429	`RATE_LIMIT`	Too many requests
500	`INTERNAL_ERROR`	Server error

Endpoints

Planet IDs

0Sun

1Moon

2Mercury

3Venus

4Mars

5Jupiter

6Saturn

7Uranus

8Neptune

9Pluto

10Mean Node

11True Node

12Mean Lilith

13True Lilith

15Chiron

House Systems

"P"Placidus

"K"Koch

"O"Porphyry

"R"Regiomontanus

"C"Campanus

"A"Equal (ASC)

"W"Whole Sign

"M"Morinus

"B"Alcabitius

"T"Polich/Page

"X"Hindu Bhava

"V"Vehlow