Stormglass

Stormglass provides a global marine and weather API delivering high-resolution forecasts, historical data, and environmental measurements for any coordinate on Earth. The platform aggregates data from multiple authoritative sources including NOAA, ECMWF, DWD, and others to provide weather point forecasts, marine data, tidal information, solar and astronomical data, biological oceanographic data, and elevation/bathymetry data. Used widely for maritime navigation, renewable energy forecasting, outdoor activity planning, and environmental monitoring applications.

Stormglass publishes 7 API contracts indexed on the APIs.io network, including Astronomy API, Bio API, Elevation API, and 4 more. Tagged areas include Astronomy, Bio, Climate, Elevation, and Forecasting.

The Stormglass catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Stormglass’ developer surface includes authentication, developer portal, documentation, signup flow, pricing, engineering blog, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

45.6/100 developing ▬ flat Agent 22/100 agent aware Front door AI 4/6 moderate Heartbeat 17/100 dormant saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Astronomy Bio Climate Elevation Forecasting Marine Ocean Solar Tides Weather Wind

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 45.6/100 · developing

Contract Quality 12.9 / 21

Developer Ergonomics 4.3 / 17

Access Clarity 12.5 / 17

Operational Transparency 1.5 / 11

Contract Governance 1.4 / 10

Discoverability 5.6 / 9

Regulatory Posture 3.1 / 15

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
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)

7 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 25.0 — up to +15.0 composite points
Operational Transparency scores 13.2 — up to +11.3 composite points
Contract Governance scores 13.6 — up to +10.4 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/stormglass/apis.yml: open an issue on github.com/api-evangelist/stormglass 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Weather and Climate Data	standard	17.2 (thin)	-	-
APIs.guru OpenAPI Directory (API definition directory)	standard	17.2 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 7

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

Stormglass Astronomy API

Solar and lunar astronomical data including sunrise, sunset, moon phases

Stormglass Bio API

Biological and oceanographic data including chlorophyll and nutrients

Stormglass Elevation API

Global elevation and bathymetry data

Stormglass Marine API

Marine environment data including waves, currents, and water temperature

Stormglass Solar API

Solar radiation and UV index data

Stormglass Tides API

Tidal data including extremes, sea level, and tide station listings

Stormglass Weather API

Point weather forecasts and historical weather data

Scroll for all 7

Postman Collections 7

Ready-to-run Postman collections for exercising this provider's APIs.

Stormglass Astronomy API

POSTMAN

Stormglass Astronomy Bio API

POSTMAN

Stormglass Astronomy Elevation API

POSTMAN

Stormglass Astronomy Marine API

POSTMAN

Stormglass Astronomy Solar API

POSTMAN

Stormglass Astronomy Tides API

POSTMAN

Stormglass Astronomy Weather API

POSTMAN

Scroll for all 7

Open Collections 8

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Stormglass Astronomy API

OPEN COLLECTION

Stormglass Astronomy Bio API

OPEN COLLECTION

Stormglass Astronomy Elevation API

OPEN COLLECTION

Stormglass Astronomy Marine API

OPEN COLLECTION

Stormglass Astronomy Solar API

OPEN COLLECTION

Stormglass Astronomy Tides API

OPEN COLLECTION

Stormglass Astronomy Weather API

OPEN COLLECTION

Stormglass API

OPEN COLLECTION

Scroll for all 8

Stormglass API pricing

Prices published by Stormglass, read 2026-10-28 from stormglass.io/pricing/.

Plan	Price
FREE	€0/ Month Includes: 10 requests per day, All weather parameters, No support, Not for commercial use
SMALL	€19/ Month Includes: 500 requests per day, All weather parameters, No support
MEDIUM	€49/ Month Includes: 5000 requests per day, All weather parameters, Full support and for commercial use
LARGE	€129/ Month Includes: 25 000 requests per day, All weather parameters, Full support and for commercial use
CUSTOM ENTERPRISE PLANS	Contact us for more information about custom plans.

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Stormglass's documentation. All 5 limits →

Billed by: subscription · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Stormglass Plans Pricing

5 plans

PLANS

Stormglass Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Stormglass Rate Limits

5 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Stormglass

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Stormglass Finops

FINOPS

Semantic Vocabularies 1

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

Stormglass Context

16 classes · 19 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Stormglass — jsonschema rules

6 rules · 4 warnings 2 info

SPECTRAL

Stormglass API Rules

9 rules · 3 errors 5 warnings 1 info

SPECTRAL

JSON Schema 2

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

Tide Extremes Response

2 properties

JSON SCHEMA

Weather Point Response

2 properties

JSON SCHEMA

JSON Structure 1

JSON Structure definitions describing this provider's data shapes.

Stormglass Weather Point Structure

0 properties

JSON STRUCTURE

Examples 3

Example request and response payloads for these APIs.

Stormglass Get Astronomy Point Example

2 fields

EXAMPLE

Stormglass Get Tide Extremes Example

2 fields

EXAMPLE

Stormglass Get Weather Point Example

2 fields

EXAMPLE

Security Posture 2

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

Stormglass Authentication

apiKey · 1 scheme

SECURITY

Stormglass Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

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

Stormglass Agentic Access

10 operations

10 operations · 0 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

Signup

Signup

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 2

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrg

GitHubOrg

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 5

Pricing, plans, and the legal terms of use

Plans

FinOps

Pricing

TermsOfService

PrivacyPolicy

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: stormglass
name: Stormglass
description: Stormglass provides a global marine and weather API delivering high-resolution forecasts, historical data, and
  environmental measurements for any coordinate on Earth. The platform aggregates data from multiple authoritative sources
  including NOAA, ECMWF, DWD, and others to provide weather point forecasts, marine data, tidal information, solar and astronomical
  data, biological oceanographic data, and elevation/bathymetry data. Used widely for maritime navigation, renewable energy
  forecasting, outdoor activity planning, and environmental monitoring applications.
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
position: Consuming
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/stormglass.png
x-docs-platform: docsify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
tags:
- Astronomy
- Bio
- Climate
- Elevation
- Forecasting
- Marine
- Ocean
- Solar
- Tides
- Weather
- Wind
created: '2025-05-02'
modified: '2026-05-19'
url: https://raw.githubusercontent.com/api-evangelist/stormglass/refs/heads/main/apis.yml
specificationVersion: '0.23'
apis:
- aid: stormglass:stormglass-astronomy-api
  name: Stormglass Astronomy API
  description: Solar and lunar astronomical data including sunrise, sunset, moon phases
  humanURL: https://stormglass.io/
  baseURL: https://api.stormglass.io/v2
  tags:
  - Astronomy
  properties:
  - type: OpenAPI
    url: openapi/stormglass-astronomy-api-openapi.yml
  - type: Documentation
    url: https://docs.stormglass.io/
  - type: Pricing
    url: https://stormglass.io/pricing
  - type: Signup
    url: https://stormglass.io/register
  - type: Website
    url: https://stormglass.io/
  - type: Blog
    url: https://stormglass.io/blog
  - type: TermsOfService
    url: https://stormglass.io/terms-and-conditions/
  - type: PrivacyPolicy
    url: https://stormglass.io/privacy-policy/
- aid: stormglass:stormglass-bio-api
  name: Stormglass Bio API
  description: Biological and oceanographic data including chlorophyll and nutrients
  humanURL: https://stormglass.io/
  baseURL: https://api.stormglass.io/v2
  tags:
  - Bio
  properties:
  - type: OpenAPI
    url: openapi/stormglass-bio-api-openapi.yml
  - type: Documentation
    url: https://docs.stormglass.io/
  - type: Pricing
    url: https://stormglass.io/pricing
  - type: Signup
    url: https://stormglass.io/register
  - type: Website
    url: https://stormglass.io/
  - type: Blog
    url: https://stormglass.io/blog
  - type: TermsOfService
    url: https://stormglass.io/terms-and-conditions/
  - type: PrivacyPolicy
    url: https://stormglass.io/privacy-policy/
- aid: stormglass:stormglass-elevation-api
  name: Stormglass Elevation API
  description: Global elevation and bathymetry data
  humanURL: https://stormglass.io/
  baseURL: https://api.stormglass.io/v2
  tags:
  - Elevation
  properties:
  - type: OpenAPI
    url: openapi/stormglass-elevation-api-openapi.yml
  - type: Documentation
    url: https://docs.stormglass.io/
  - type: Pricing
    url: https://stormglass.io/pricing
  - type: Signup
    url: https://stormglass.io/register
  - type: Website
    url: https://stormglass.io/
  - type: Blog
    url: https://stormglass.io/blog
  - type: TermsOfService
    url: https://stormglass.io/terms-and-conditions/
  - type: PrivacyPolicy
    url: https://stormglass.io/privacy-policy/
- aid: stormglass:stormglass-marine-api
  name: Stormglass Marine API
  description: Marine environment data including waves, currents, and water temperature
  humanURL: https://stormglass.io/
  baseURL: https://api.stormglass.io/v2
  tags:
  - Marine
  properties:
  - type: OpenAPI
    url: openapi/stormglass-marine-api-openapi.yml
  - type: Documentation
    url: https://docs.stormglass.io/
  - type: Pricing
    url: https://stormglass.io/pricing
  - type: Signup
    url: https://stormglass.io/register
  - type: Website
    url: https://stormglass.io/
  - type: Blog
    url: https://stormglass.io/blog
  - type: TermsOfService
    url: https://stormglass.io/terms-and-conditions/
  - type: PrivacyPolicy
    url: https://stormglass.io/privacy-policy/
- aid: stormglass:stormglass-solar-api
  name: Stormglass Solar API
  description: Solar radiation and UV index data
  humanURL: https://stormglass.io/
  baseURL: https://api.stormglass.io/v2
  tags:
  - Solar
  properties:
  - type: OpenAPI
    url: openapi/stormglass-solar-api-openapi.yml
  - type: Documentation
    url: https://docs.stormglass.io/
  - type: Pricing
    url: https://stormglass.io/pricing
  - type: Signup
    url: https://stormglass.io/register
  - type: Website
    url: https://stormglass.io/
  - type: Blog
    url: https://stormglass.io/blog
  - type: TermsOfService
    url: https://stormglass.io/terms-and-conditions/
  - type: PrivacyPolicy
    url: https://stormglass.io/privacy-policy/
- aid: stormglass:stormglass-tides-api
  name: Stormglass Tides API
  description: Tidal data including extremes, sea level, and tide station listings
  humanURL: https://stormglass.io/
  baseURL: https://api.stormglass.io/v2
  tags:
  - Tides
  properties:
  - type: OpenAPI
    url: openapi/stormglass-tides-api-openapi.yml
  - type: Documentation
    url: https://docs.stormglass.io/
  - type: Pricing
    url: https://stormglass.io/pricing
  - type: Signup
    url: https://stormglass.io/register
  - type: Website
    url: https://stormglass.io/
  - type: Blog
    url: https://stormglass.io/blog
  - type: TermsOfService
    url: https://stormglass.io/terms-and-conditions/
  - type: PrivacyPolicy
    url: https://stormglass.io/privacy-policy/
- aid: stormglass:stormglass-weather-api
  name: Stormglass Weather API
  description: Point weather forecasts and historical weather data
  humanURL: https://stormglass.io/
  baseURL: https://api.stormglass.io/v2
  tags:
  - Weather
  properties:
  - type: OpenAPI
    url: openapi/stormglass-weather-api-openapi.yml
  - type: Documentation
    url: https://docs.stormglass.io/
  - type: Pricing
    url: https://stormglass.io/pricing
  - type: Signup
    url: https://stormglass.io/register
  - type: Website
    url: https://stormglass.io/
  - type: Blog
    url: https://stormglass.io/blog
  - type: TermsOfService
    url: https://stormglass.io/terms-and-conditions/
  - type: PrivacyPolicy
    url: https://stormglass.io/privacy-policy/
common:
- type: Plans
  url: plans/stormglass-plans-pricing.yml
- type: RateLimits
  url: rate-limits/stormglass-rate-limits.yml
- type: FinOps
  url: finops/stormglass-finops.yml
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/stormglass/overview
- type: AgenticAccess
  url: agentic-access/stormglass-agentic-access.yml
- type: DomainSecurity
  url: security/stormglass-domain-security.yml
- type: Authentication
  url: authentication/stormglass-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/stormglassio
- type: Portal
  url: https://stormglass.io/
- type: Documentation
  url: https://docs.stormglass.io/
- type: Signup
  url: https://stormglass.io/register
- type: Pricing
  url: https://stormglass.io/pricing
- type: Website
  url: https://stormglass.io/
- type: Blog
  url: https://stormglass.io/blog
- type: TermsOfService
  url: https://stormglass.io/terms-and-conditions/
- type: PrivacyPolicy
  url: https://stormglass.io/privacy-policy/
- type: GitHubOrg
  url: https://github.com/stormglass
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Stormglass API — frequently asked questions

Does Stormglass have an API?

Yes. APIs.io lists 7 APIs from Stormglass, including Stormglass Astronomy API, Stormglass Bio API and Stormglass Elevation API, and 4 more.

Is there an OpenAPI specification for the Stormglass API?

Yes. APIs.io indexes 7 OpenAPI specifications for Stormglass, each linked for download from this page.

How do I authenticate with the Stormglass API?

Stormglass uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Stormglass Authentication.

How much does the Stormglass API cost?

Stormglass publishes its prices; its FREE plan is €0/ Month as of 2026-10-28. APIs.io lists 5 pricing plans for Stormglass, with each plan's price, limits and inclusions under Pricing on this page.

Is the Stormglass API ready for AI agents?

Stormglass has a Kin Score of 45.6 out of 100 (developing) and an Agent Readiness score of 21.8 (agent-aware), scored by API Evangelist on 2026-11-06.

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get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
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apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
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