openephemeris-com
Open Ephemeris provides a high‑precision ephemeris API for developers and AI agents, delivering sub‑arcsecond planetary positions, aspects, and full chart structures from NASA JPL DE440 data covering 1550‑2650 CE. The service powers astrology, human design, astro‑cartography, and compatibility engines with clean REST endpoints and MCP integration for ChatGPT and Claude, offering free trial credits and detailed documentation.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles openephemeris-com the way a machine reads it — 33 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — openephemeris-com scores 59.7/100 (strong), with a separate agent-readiness read of 38/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-10-31 · rubric v0.25.0
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How we profile openephemeris-com
Each block below is one kind of artifact we hold for openephemeris-com. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 20
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
openephemeris-com ACG API
Map the cosmos to the earth. Astrocartography (ACG), cyclocartography (CCG), and Local Space endpoints. Returns GeoJSON feature collections—perfect for drawing maps in your app....
openephemeris-com Agricultural API
Work with the earth's rhythms. Biodynamic planting profiles and multi-day agricultural calendars. **1 unit per request.**
openephemeris-com API Metadata API
Discover the API schema and current contract hash. **Free — not metered.**
openephemeris-com Calendar API
Mark the turning of the wheel. Cross-quarter days, exact moon phases, and lunar standstills. **10 units per request.**
openephemeris-com Catalogs API
Explore our extensive reference catalogs. See all supported planets, asteroids, fixed stars, and star groups available for calculation. **Free — not metered.**
openephemeris-com Chinese API
Eastern insights. BaZi (Four Pillars) charts, element balance, luck pillars, ten gods analysis, compatibility, solar terms, and the Chinese zodiac. **1 unit per request** (eleme...
openephemeris-com Comparative API
Explore relationships and overlays. Cast synastry, composite, and transit-to-natal charts effortlessly. **3 units per request** (flat rate; does not scale by subject count).
openephemeris-com Eclipse API
Find the shadows. Calculate solar and lunar eclipses, global circumstances, next-visible searches, and Saros series data (solar eclipses only — lunar eclipse responses do not po...
openephemeris-com Electional API
Find the best moment for a specific activity. Score a moment's viability, search a date range for top-ranked windows, track planetary stations, and search active aspects. **5 un...
openephemeris-com Ephemeris API
Discover the foundation of any chart. Get natal positions, houses, lots, core aspects, and fixed stars. Calculated with NASA-grade precision (JPL DE440, 1550–2650 CE). **1 unit ...
openephemeris-com Health API
System health and readiness checks. **Free — not metered.**
openephemeris-com Human Design API
Map the energetic blueprint. Bodygraphs, composite charts, transit fields, and pentas. **2 units per request** (transit-chart and composite are 3).
openephemeris-com Location Timezone API
Geocoding and timezone resolution to help you locate your charts accurately. **1 unit per request.**
openephemeris-com Lunar API
Track the Moon's journey. Phases, aspects, void-of-course windows, and exact lunar ingresses. **1 unit per request.**
openephemeris-com Predictive API
Look ahead (or behind). Find exact times for transits, cast solar & lunar returns, calculate progressions, and run traditional time-lord techniques (primary directions, firdaria...
openephemeris-com Tidal API
Calculate tidal forces and lunar coastal influences. **1 unit per request.**
openephemeris-com Time Conversion API
Convert between time formats. Julian Day numbers, sidereal time, sunrise/sunset. **1 unit per request.**
openephemeris-com Vedic API
Vedic (Jyotish) calculations including Ayanamsha and the Navamsa (D-9) divisional chart. **1 unit per request.**
openephemeris-com Venus Cycles API
Explore the elegant dance of Venus. Synodic cycle analysis and Star Points. **1 unit per request.**
openephemeris-com Visualization API
Render chart imagery. Generate natal chart wheels, comparative bi-wheels, and Human Design bodygraphs as SVG or PNG. Free on every tier, including Explorer. **2 units per reques...
Scroll within the panel for all 20 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Semantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Openephemeris Com Context
JSON-LDSpectral Rules 1
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
openephemeris-com API Rules
SPECTRALJSON Schema 6
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
ACGCCGRequestPayload
JSON SCHEMAACGLocalSpaceRequestPayload
JSON SCHEMAACGRequestPayload
JSON SCHEMANatalChartEnhancedResponse
JSON SCHEMAVedicChartRequest
JSON SCHEMAZodiacalReleasingResponse
JSON SCHEMASecurity Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for openephemeris-com — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 2
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 3
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 5
Authentication, authorization, and security posture
Operate 2
Status, limits, changes, and where to get help
Commercial 4
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 2
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/openephemeris-com · machine-readable index on apis.io
This is an independent, third-party profile of openephemeris-com, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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