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Astro Agents Western Synastry API
x402
Astro Agents Western Synastry API is a paid API for AI agents from astro-agent.dev, paid per call via x402, $0.12/call, status unknown (last checked 2026-10-11).
Computes deterministic Western astrology synastry (relationship compatibility) between two people using NASA/JPL DE440 ephemeris, returning cross-aspects, orbs, and aspect counts.
Price / call$0.12
Success—
StatusUnknown
How this service works
Synastry: Relationship comparison: cross-aspects, house overlays both ways, composite midpoints.
Output
Returns a JSON object containing: a meta block with engine version, ephemeris details, determinism flag, and a reproducible SHA-256 hash of the result; an endpoint label; and a result excerpt with aspect_counts (harmonious, challenging, conjunctions) and an array of cross_aspects, each detailing the aspect type, angle, orb, orb_allowed, points involved, and exactness percentage.
Example use cases
Couple compatibility chart analysis
“Calculate the Western synastry for my partner and me — I was born January 5 1985 at 8:00am in Los Angeles (34.05° N, 118.24° W) and she was born June 18 1987 at 3:45pm in Chicago (41.88° N, 87.63° W). Use tropical zodiac with Placidus houses and show me all aspects including oppositions and trines.”
Celebrity couple astrological aspects
“Run a synastry chart between Brad Pitt, born December 18 1963 at 6:31am in Shawnee, Oklahoma (35.33° N, 96.93° W), and Angelina Jolie, born June 4 1975 at 9:09am in Los Angeles (34.05° N, 118.24° W), using whole sign houses and tropical zodiac. I want to see only conjunctions, oppositions, and trines.”
Sidereal Vedic synastry comparison
“Compare the birth charts of two people using sidereal zodiac and Lahiri ayanamsa — Person A was born September 10 1992 at 7:00pm in Mumbai (19.08° N, 72.88° E) and Person B was born February 28 1990 at noon in Delhi (28.61° N, 77.21° E). Use whole sign houses and include all planets.”
Technical details
Endpoint
POSThttps://astro-agent.dev/v1/western/synastry?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need reproducible, deterministic synastry computations grounded in real ephemeris data (NASA/JPL DE440) rather than LLM-generated or approximate astrological interpretations. Ideal when verifiability matters (SHA-256 hashes allow result auditing), when both Western and Vedic zodiac systems need to be supported, or when you want fine-grained control over house systems, aspect filters, orb sizes, and specific planetary points. Prefer over generic astrology APIs when precision, reproducibility, and agent-friendly structured output are required.
Side effects
- Missing required latitude or longitude for either person returns a validation error
- Invalid date or time format causes parsing failure
- Requesting an unsupported house system or ayanamsa enum value returns a 400 error
- Dates outside the JPL DE440 ephemeris range (1800–2200) may return an out-of-range error
- Invalid orb values exceeding the maximum of 15 degrees return a validation error
- Payment not included or insufficient USDC causes a 402 payment required error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"meta": {
"engine": "astro-agents/1.0.3",
"llm_used": false,
"ephemeris": "NASA/JPL DE440 (1800-01-01..2200-01-01)",
"deterministic": true,
"result_sha256": "d73954df219854b1f2ad98476b58986d82ee19cfffc91b8adaea011df6eb4f01"
},
"endpoint": "western/synastry",
"result_excerpt": {
"aspect_counts": {
"harmonious": 27,
"challenging": 28,
"conjunctions": 11
},
"cross_aspects": [
{
"orb": 0.192882,
"angle": 180,
"aspect": "opposition",
"point_a": "a:true_node",
"point_b": "b:mercury",
"orb_allowed": 8,
"exactness_pct": 97.6
}
]
}
}
}Tags
x402
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