Synastry Chart API
AvailableBoth people's positions, the aspects between their charts, and a compatibility block with score, Sun and Moon compatibility and a verdict.
Call it with POST /v1/western/synastry-chart. Input: two people's birth details. Output: JSON, as a direct response. Each successful call costs 1 credit.
- Endpoint
- POST /v1/western/synastry-chart
- Input
- Two people's birth details
- Output
- JSON
- Delivery
- Direct response
- Cost
- 1 credit
- Compute class
- Standard
Example response
Fields in data (inferred from the example)
person_a· objectperson_b· objectinter_aspects· array of objectcompatibility· object
Example response
Captured from the live engine with a sandbox key (so credits_used is 0) and trimmed: long arrays keep their first items and images are replaced by a placeholder.
Loading the example…
Request schema and every field: the Western astrology reference.
Synastry Chart API: common questions
What does the Synastry Chart API return?
Both people's positions, the aspects between their charts, and a compatibility block with score, Sun and Moon compatibility and a verdict. The response's data object includes person_a, person_b, inter_aspects and compatibility. See the reference for an example response.
What input does Synastry Chart need?
Two people's birth details.
How much does a Synastry Chart call cost?
1 credit per successful call; a failed call is not charged. Plans and top-ups are on the pricing page.
Can I try it before paying?
Yes. Every account gets sandbox keys and trial credits, so you can call it from your own code before choosing a plan.