{"uid":"cap_HDN9xSqBsaJLeT81EWMbf","slug":"astro-agents-western-synastry-api-d762b7be","name":"Astro Agents Western Synastry API","description":"Synastry: Relationship comparison: cross-aspects, house overlays both ways, composite 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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}]}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.12","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.12/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.12","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.12","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_EL0RfJCmglkwRrOxoC_El","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.12","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes deterministic Western astrology synastry (relationship compatibility) between two people using NASA/JPL DE440 ephemeris, returning cross-aspects, orbs, and aspect counts.","exampleAgentPrompt":"Can you calculate the Western synastry between Alice, born on March 15 1990 at 2:30pm in New York (40.71° N, 74.01° W), and Bob, born on July 22 1988 at 11:00am in London (51.51° N, 0.13° W), using Placidus houses and tropical zodiac, and show me all their cross-aspects?","exampleUseCases":[{"title":"Couple compatibility chart analysis","prompt":"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."},{"title":"Celebrity couple astrological aspects","prompt":"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."},{"title":"Sidereal Vedic synastry comparison","prompt":"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."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T00:32:25.394Z","isFirstParty":false,"canonicalSlug":"astro-agents-western-synastry-api-d762b7be"}