Cosmic Ephemeris

Cosmic Ephemeris provides a comprehensive suite of astrology calculation APIs, offering 78 live endpoints covering Western, Sidereal, and Vedic astrology, symbolic readings, Tarot interpretations, and Hindu calendar data. The service supports up to 500 free monthly requests and includes SDK and MCP guides for developers.

Cosmic Ephemeris publishes 3 API contracts indexed on the APIs.io network: Calculations API, Interpretation API, and Pro timeline API. Tagged areas include Astrology, API, Developer, Data, and U.S.-based.

The Cosmic Ephemeris catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Cosmic Ephemeris’ developer surface includes authentication, signup flow, pricing, getting-started guide, documentation, and 24 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

53.8/100 developing Agent 44/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 1 MCP Servers 1 Agent Skills

AstrologyAPIDeveloperDataU.S.-based

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 53.8/100 · developing

Contract Quality 14.7 / 21

Developer Ergonomics 7.2 / 17

Access Clarity 13.0 / 17

Operational Transparency 1.2 / 11

Contract Governance 2.2 / 10

Discoverability 5.5 / 9

Regulatory Posture 4.6 / 15

Agent readiness — 44/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's

3 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Operational Transparency scores 10.5 — up to +11.6 composite points
Developer Ergonomics scores 42.3 — up to +11.5 composite points
Contract Governance scores 22.0 — up to +9.4 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/cosmic-ephemeris/apis.yml: open an issue on github.com/api-evangelist/cosmic-ephemeris to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

Cosmic Ephemeris Calculations API

The Calculations API from Cosmic Ephemeris — 76 operation(s) for calculations.

Cosmic Ephemeris Interpretation API

Deterministic rule-based output, distinct from raw calculation data.

Cosmic Ephemeris Pro timeline API

The Pro timeline API from Cosmic Ephemeris — 1 operation(s) for pro timeline.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Cosmic Ephemeris MCP Server

Remote MCP server at api.cosmicephemeris.com requiring an API key.

MCP SERVER

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

cosmic-ephemeris-calculate-full-birth-chart

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Cosmic Ephemeris Plans Pricing

3 plans

PLANS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Cosmic Ephemeris Context

120 classes · 328 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Cosmic Ephemeris API Rules

17 rules · 15 errors 1 warnings 1 info

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

BirthChartResponse

3 properties

JSON SCHEMA

ConnectedElectionalCriterionRepairHardeningParetoAuditElectionalCriterionRepairHardeningParetoAuditResponse

0 properties

JSON SCHEMA

ConnectedElectionalCriterionRepairHardeningParetoHierarchyAuditElectionalCriterionRepairHardeningParetoHierarchyAuditResponse

0 properties

JSON SCHEMA

ConnectedVimshottariResponse

0 properties

JSON SCHEMA

PlaceSearchRequest

3 properties

JSON SCHEMA

PlaceSearchResponse

6 properties

JSON SCHEMA

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Cosmic Ephemeris Authentication

2 schemes

SECURITY

Cosmic Ephemeris Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Cosmic Ephemeris Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Cosmic Ephemeris Agentic Access

78 operations · 70 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

SignUp

SignUp

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

MCPServer

WellKnown

Design & Contract 8

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Idempotency

Conventions

ErrorCatalog

Conformance

Scroll for all 8

Build 3

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

SDKs

SDKs

Packages

Packages

Access & Security 5

Authentication, authorization, and security posture

Security

Security

Authentication

Authentication

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Hosts

Hosts

Source (apis.yml)

aid: cosmic-ephemeris
name: Cosmic Ephemeris
image: https://cosmicephemeris.com/images/cosmic-ephemeris-social.png
description: Cosmic Ephemeris provides a comprehensive suite of astrology calculation APIs, offering 78 live endpoints covering
  Western, Sidereal, and Vedic astrology, symbolic readings, Tarot interpretations, and Hindu calendar data. The service supports
  up to 500 free monthly requests and includes SDK and MCP guides for developers.
url: https://raw.githubusercontent.com/api-evangelist/cosmic-ephemeris/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-20 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-20'
modified: '2026-10-20'
tags:
- Astrology
- API
- Developer
- Data
- U.S.-based
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/cosmic-ephemeris-agentic-access.yml
- type: Plans
  url: plans/cosmic-ephemeris-plans-pricing.yml
- type: Spectral
  url: rules/cosmic-ephemeris-rules.yml
- type: JSONLD
  url: json-ld/cosmic-ephemeris-context.jsonld
- type: Vocabulary
  url: vocabulary/cosmic-ephemeris-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/cosmic-ephemeris-data-model.yml
- type: Idempotency
  url: conventions/cosmic-ephemeris-conventions.yml
- type: Conventions
  url: conventions/cosmic-ephemeris-conventions.yml
- type: Security
  url: security/cosmic-ephemeris-vulnerability-disclosure.yml
- type: Authentication
  url: authentication/cosmic-ephemeris-authentication.yml
- type: ErrorCatalog
  url: errors/cosmic-ephemeris-problem-types.yml
- type: Conformance
  url: conformance/cosmic-ephemeris-conformance.yml
- type: ToolCrosswalk
  url: mcp/cosmic-ephemeris-tool-crosswalk.yml
- type: MCPServer
  url: mcp/cosmic-ephemeris-mcp.yml
- type: SecurityTxt
  url: well-known/cosmic-ephemeris-security.txt
- type: WellKnown
  url: well-known/cosmic-ephemeris-well-known.yml
- type: Hosts
  url: hosts/cosmic-ephemeris-hosts.yml
- type: SDKs
  url: packages/cosmic-ephemeris-packages.yml
- type: Packages
  url: packages/cosmic-ephemeris-packages.yml
- type: TermsOfService
  url: https://cosmicephemeris.com/terms.html
- type: SignUp
  url: https://cosmicephemeris.com/signup.html
- type: PrivacyPolicy
  url: https://cosmicephemeris.com/privacy.html
- type: Pricing
  url: https://cosmicephemeris.com/pricing.html
- type: GettingStarted
  url: https://cosmicephemeris.com/docs-onboarding-context.html
- type: VulnerabilityDisclosure
  url: security/cosmic-ephemeris-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/cosmic-ephemeris-domain-security.yml
- type: Website
  url: https://cosmicephemeris.com/
- type: Documentation
  url: https://cosmicephemeris.com/docs.html
apis:
- aid: cosmic-ephemeris:cosmic-ephemeris-calculations-api
  name: Cosmic Ephemeris Calculations API
  description: The Calculations API from Cosmic Ephemeris — 76 operation(s) for calculations.
  humanURL: https://cosmicephemeris.com
  baseURL: https://api.cosmicephemeris.com
  tags:
  - Calculations
  properties:
  - type: OpenAPI
    url: openapi/cosmic-ephemeris-calculations-api-openapi.yml
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-place-search-response-schema.json
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-place-search-request-schema.json
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-connected-electional-criterion-repair-hardening-pareto-hierarchy-audit-electional-criterion-repair-hardening-pareto-hierarchy-audit-response-schema.json
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-connected-vimshottari-response-schema.json
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-birth-chart-response-schema.json
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-connected-electional-criterion-repair-hardening-pareto-audit-electional-criterion-repair-hardening-pareto-audit-response-schema.json
- aid: cosmic-ephemeris:cosmic-ephemeris-interpretation-api
  name: Cosmic Ephemeris Interpretation API
  description: Deterministic rule-based output, distinct from raw calculation data.
  humanURL: https://cosmicephemeris.com
  baseURL: https://api.cosmicephemeris.com
  tags:
  - Interpretation
  properties:
  - type: OpenAPI
    url: openapi/cosmic-ephemeris-interpretation-api-openapi.yml
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-place-search-response-schema.json
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-place-search-request-schema.json
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-connected-electional-criterion-repair-hardening-pareto-hierarchy-audit-electional-criterion-repair-hardening-pareto-hierarchy-audit-response-schema.json
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-connected-vimshottari-response-schema.json
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-birth-chart-response-schema.json
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-connected-electional-criterion-repair-hardening-pareto-audit-electional-criterion-repair-hardening-pareto-audit-response-schema.json
- aid: cosmic-ephemeris:cosmic-ephemeris-pro-timeline-api
  name: Cosmic Ephemeris Pro timeline API
  description: The Pro timeline API from Cosmic Ephemeris — 1 operation(s) for pro timeline.
  humanURL: https://cosmicephemeris.com
  baseURL: https://api.cosmicephemeris.com
  tags:
  - Pro timeline
  properties:
  - type: OpenAPI
    url: openapi/cosmic-ephemeris-pro-timeline-api-openapi.yml
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-place-search-response-schema.json
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-place-search-request-schema.json
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-connected-electional-criterion-repair-hardening-pareto-hierarchy-audit-electional-criterion-repair-hardening-pareto-hierarchy-audit-response-schema.json
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-connected-vimshottari-response-schema.json
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-birth-chart-response-schema.json
  - type: JSONSchema
    url: json-schema/cosmic-ephemeris-connected-electional-criterion-repair-hardening-pareto-audit-electional-criterion-repair-hardening-pareto-audit-response-schema.json
x-submission-notes: 'Please list Cosmic Ephemeris and its public developer APIs: 78 documented astrology calculations plus
  supplemental Tarot, symbolic readings, and Vedic systems.


  Main OpenAPI 3.1:

  https://cosmicephemeris.com/openapi.json


  Postman collection:

  https://cosmicephemeris.com/postman.json


  Supplemental API documentation:

  https://cosmicephemeris.com/docs-interpretation.html


  MCP documentation:

  https://cosmicephemeris.com/docs-mcp.html


  Public MCP endpoint:

  https://api.cosmicephemeris.com/mcp


  Official MC'
x-submission-probe: root 200, OpenAPI 200 (8MB), soft-404 clean
x-submitted-by: support@cosmicephemeris.com (apis.io/add, 2026-10-18)
x-enrichment:
  date: '2026-10-20'
  status: enriched
  artifacts_added: 26
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Cosmic Ephemeris API — frequently asked questions

Does Cosmic Ephemeris have an API?

Yes. APIs.io lists 3 APIs from Cosmic Ephemeris, including Cosmic Ephemeris Calculations API, Cosmic Ephemeris Interpretation API and Cosmic Ephemeris Pro timeline API.

Is there an OpenAPI specification for the Cosmic Ephemeris API?

Yes. APIs.io indexes 3 OpenAPI specifications for Cosmic Ephemeris, each linked for download from this page.

How do I authenticate with the Cosmic Ephemeris API?

Cosmic Ephemeris documents its authentication (2 schemes). The details are profiled on APIs.io as Cosmic Ephemeris Authentication.

How much does the Cosmic Ephemeris API cost?

APIs.io lists 3 pricing plans for Cosmic Ephemeris, with each plan's price, limits and inclusions under Pricing Plans on this page.

Does Cosmic Ephemeris have an MCP server?

Yes. APIs.io lists 1 MCP server for Cosmic Ephemeris: Remote MCP server at api.cosmicephemeris.com requiring an API key.

Is the Cosmic Ephemeris API ready for AI agents?

Cosmic Ephemeris has a Kin Score of 53.8 out of 100 (developing) and an Agent Readiness score of 44.4 (agent-ready), scored by API Evangelist on 2026-10-31.

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