Cesium

Cesium provides an open platform for 3D geospatial applications, offering tools like CesiumJS, Cesium ion, and integrations for Unity, Unreal, and Omniverse. It serves developers, enterprises, and government agencies with streaming 3D Tiles, curated global content, and AI‑enabled workflows, enabling visualization, analysis, and design of complex spatial data.

Cesium publishes 10 API contracts indexed on the APIs.io network, including Archives API, Asset Elements API, Assets API, and 7 more. Tagged areas include Company, Geospatial, 3D, Platform, and Open Source.

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

Cesium’s developer surface includes signup flow, pricing, engineering blog, and 20 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

41.2/100 developing ▬ flat Agent 31/100 agent ready Heartbeat 97/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 published contract

Company Geospatial 3D Platform Open Source

Kin Score

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

Composite quality — 41.2/100 · developing

Contract Quality 12.7 / 19

Developer Ergonomics 1.2 / 15

Access Clarity 7.7 / 15

Operational Transparency 2.1 / 10

Contract Governance 2.0 / 9

Discoverability 5.6 / 8

Regulatory Posture 2.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 31/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 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 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 0 / 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

8 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 8.3 — up to +18.3 composite points
Operational Transparency scores 21.1 — up to +10.3 composite points
Access Clarity scores 51.3 — up to +9.7 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/cesium/apis.yml: open an issue on github.com/api-evangelist/cesium 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 →

Standards implemented 2

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.

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

OpenAPI

measured — observed by APIs.io (published)

APIs 10

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

Cesium ion API

Cesium ion REST API for tiling and streaming capabilities

Cesium Archives API

Archives allow you to make downloadable versions of your assets for offline use or hosting outside of Cesium ion. With archives you can: * Create a full copy of an asset as a zi...

Cesium Asset Elements API

The Asset Elements API provides a mechanism to query individual elements within an asset.

Cesium Assets API

Whether you have imagery, terrain, 3D buildings, point clouds, photogrammetry, or one of the many other types of data we support, ion creates what we refer to as an asset. There...

Cesium Experimental API

Experimental API lets users test emerging capabilities and help shape future improvements. These endpoints are not intended for production use and may be removed without notice.

Cesium Exports API

Allows you to export the files for a particular asset to an Amazon S3 bucket of your choice. These files can then be hosted through a custom server or downloaded for local/offli...

Cesium Labels API

Labels let you organize assets and stories with reusable metadata tags. The Labels API provides a mechanism to list, create, update, and delete account labels. Asset-label assig...

Cesium OAuth API

The Oauth API provides a mechanism to allow third-party applications to access a user's ion account data through the Oauth 2.0 authorization framework.

Cesium Tokens API

The Tokens API provides a mechanism to create and manage access tokens. Access tokens are used to give applications access to your ion account, including access to stream your i...

Cesium User API

Routes related to the currently authenticated account.

Scroll for all 10

Cesium API pricing

Prices published by Cesium, read 2026-10-13 from cesium.com/platform/cesium-ion/pricing/. A free plan or tier is listed.

Plan	Price
Community	Free (individual)
Commercial Individual	$149/month (individual)
Commercial Team	$524/month (team)
Premium Individual	$499/month (individual)
Premium Team	$874/month (team)
Custom	Contact Sales

Plan details, limits and sources →

Billed by: seat · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Cesium Plans Pricing

6 plans

PLANS

Cesium Price Estimates

0 plans

PLANS

Service Levels 1

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

Cesium

SLA

FinOps 1

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

Cesium Finops

FINOPS

Semantic Vocabularies 1

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

Cesium Context

36 classes · 58 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Cesium API Rules

16 rules · 13 errors 2 warnings 1 info

SPECTRAL

JSON Schema 6

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

Archive Metadata

7 properties

JSON SCHEMA

Asset Endpoint

4 properties

JSON SCHEMA

Asset Metadata

16 properties

JSON SCHEMA

External Asset Endpoint

3 properties

JSON SCHEMA

Token Metadata

9 properties

JSON SCHEMA

Token Metadata

11 properties

JSON SCHEMA

Security Posture 1

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

Cesium Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Conformance

DataModel

ErrorCatalog

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

SecurityTxt

SecurityTxt

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

StatusPage

StatusPage

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

Pricing

Pricing

Company 3

The organization behind the API

Newsroom

Newsroom

Blog

Blog

Website

Website

Other 3

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Leadership

Leadership

Source (apis.yml)

aid: cesium
name: Cesium
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://images.prismic.io/cesium/d8282fb7-4939-4a71-a4e2-08005792e788_cesium-logo-globe.jpg?auto=compress,format&rect=0,9,1172,612&w=1200&h=627
description: Cesium provides an open platform for 3D geospatial applications, offering tools like CesiumJS, Cesium ion, and
  integrations for Unity, Unreal, and Omniverse. It serves developers, enterprises, and government agencies with streaming
  3D Tiles, curated global content, and AI‑enabled workflows, enabling visualization, analysis, and design of complex spatial
  data.
url: https://raw.githubusercontent.com/api-evangelist/cesium/refs/heads/main/apis.yml
x-type: company
x-source: harvest:tag-qc
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-13 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-13'
modified: '2026-10-13'
tags:
- Company
- Geospatial
- 3D
- Platform
- Open Source
tags_raw:
- Company
- Geospatial
- 3D
- Platform
- OpenSource
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/cesium-rules.yml
- type: JSONLD
  url: json-ld/cesium-context.jsonld
- type: Vocabulary
  url: vocabulary/cesium-vocabulary.yml
- type: Conformance
  url: conformance/cesium-conformance.yml
- type: Plans
  url: plans/cesium-plans-pricing.yml
- type: DataModel
  url: data-model/cesium-data-model.yml
- type: ErrorCatalog
  url: errors/cesium-problem-types.yml
- type: LLMsTxt
  url: llms/cesium-llms.txt
- type: SecurityTxt
  url: well-known/cesium-status-security.txt
- type: WellKnown
  url: well-known/cesium-well-known.yml
- type: Hosts
  url: hosts/cesium-hosts.yml
- type: Vendors
  url: vendors/cesium-vendors.yml
- type: SDKs
  url: packages/cesium-packages.yml
- type: Packages
  url: packages/cesium-packages.yml
- type: StatusPage
  url: https://status.cesium.com/
- type: SignUp
  url: https://cesium.com/ion/signup
- type: Pricing
  url: https://cesium.com/platform/cesium-ion/pricing/
- type: Newsroom
  url: https://cesium.com/press/
- type: Leadership
  url: https://cesium.com/team/
- type: GitHubOrganization
  url: https://github.com/CesiumGS
- type: Blog
  url: https://cesium.com/blog/
- type: DomainSecurity
  url: security/cesium-domain-security.yml
- type: Website
  url: https://cesium.com/
apis:
- name: Cesium ion API
  description: Cesium ion REST API for tiling and streaming capabilities
  humanURL: https://ion.cesium.com/
  baseURL: https://ion.cesium.com/
  aid: cesium:cesium-ion-api
- aid: cesium:cesium-archives-api
  name: Cesium Archives API
  description: 'Archives allow you to make downloadable versions of your assets for offline use or hosting outside of Cesium
    ion.


    With archives you can:


    * Create a full copy of an asset as a zip file

    * Clip out a subset of a 3D Tiles, terrain, or imagery asset as a glTF model or 3D Tiles 1.1 zip file


    Full asset downloads do not support Asset Depot assets or terrain assets which use a base terrain. Check the [archivable](#operation/getAsset)
    property of the asset to detect availability.


    <a name="archive-clip-requirements"></a>

    Clips support both your assets and most Asset Depot assets, but have additional restrictions:


    * Clips can only be made from 3D Tiles or terrain & imagery assets.

    * Clips comprised of your assets have a geographic size limit of 200 km^2

    * Clips comprised of Asset Depot assets have a geographic size limit of 25 km^2

    * The number of Clips you can make with Asset Depot assets within a billing period is limited by your plan. See [Cesium
    ion pricing plans](https://cesium.com/platform/cesium-ion/pricing/) for specific limits.


    Individual archives count against your account storage quota. If your account goes over storage quota, additional archives
    will not be possible without upgrading your plan or deleting existing archives or assets to free up space.'
  humanURL: https://ion.cesium.com/
  baseURL: https://ion.cesium.com/
  tags:
  - Archives
  properties:
  - type: OpenAPI
    url: openapi/cesium-archives-api-openapi.yml
  - type: JSONSchema
    url: json-schema/cesium-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-asset-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-default-token-schema.json
  - type: JSONSchema
    url: json-schema/cesium-external-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-archive-metadata2-schema.json
- aid: cesium:cesium-asset-elements-api
  name: Cesium Asset Elements API
  description: The Asset Elements API provides a mechanism to query individual elements within an asset.
  humanURL: https://ion.cesium.com/
  baseURL: https://ion.cesium.com/
  tags:
  - Asset Elements
  properties:
  - type: OpenAPI
    url: openapi/cesium-asset-elements-api-openapi.yml
  - type: JSONSchema
    url: json-schema/cesium-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-asset-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-default-token-schema.json
  - type: JSONSchema
    url: json-schema/cesium-external-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-archive-metadata2-schema.json
- aid: cesium:cesium-assets-api
  name: Cesium Assets API
  description: 'Whether you have imagery, terrain, 3D buildings, point clouds, photogrammetry, or one of the many other types
    of data we support, ion creates what we refer to as an asset.


    There are seven types of assets:


    | Value | Description |

    | - | - |

    | 3DTILES | A [3D Tiles](https://github.com/CesiumGS/3d-tiles) tileset |

    | GLTF | A [glTF](https://github.com/KhronosGroup/glTF/tree/master/specification/2.0) model |

    | IMAGERY | An TMS and WMTS compatible imagery layer |

    | TERRAIN | A [quantized-mesh-1.0](https://github.com/CesiumGS/quantized-mesh) terrain tileset |

    | CZML | A [CZML](https://github.com/AnalyticalGraphicsInc/czml-writer/wiki/CZML-Guide) dataset |

    | KML | A [KML](https://developers.google.com/kml) or KMZ dataset |

    | GEOJSON | A [GeoJSON](https://geojson.org/) dataset |


    The Assets API provides a mechanism to discover, create, and stream these assets into your own applications.'
  humanURL: https://ion.cesium.com/
  baseURL: https://ion.cesium.com/
  tags:
  - Assets
  properties:
  - type: OpenAPI
    url: openapi/cesium-assets-api-openapi.yml
  - type: JSONSchema
    url: json-schema/cesium-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-asset-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-default-token-schema.json
  - type: JSONSchema
    url: json-schema/cesium-external-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-archive-metadata2-schema.json
- aid: cesium:cesium-experimental-api
  name: Cesium Experimental API
  description: Experimental API lets users test emerging capabilities and help shape future improvements. These endpoints
    are not intended for production use and may be removed without notice.
  humanURL: https://ion.cesium.com/
  baseURL: https://ion.cesium.com/
  tags:
  - Experimental
  properties:
  - type: OpenAPI
    url: openapi/cesium-experimental-api-openapi.yml
  - type: JSONSchema
    url: json-schema/cesium-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-asset-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-default-token-schema.json
  - type: JSONSchema
    url: json-schema/cesium-external-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-archive-metadata2-schema.json
- aid: cesium:cesium-exports-api
  name: Cesium Exports API
  description: 'Allows you to export the files for a particular asset to an Amazon S3 bucket of your choice. These files can
    then be hosted through a custom server or downloaded for local/offline use.


    The number of bytes exported counts against your monthly streaming quota. If your account goes over streaming quota, additional
    exports will not be possible until the next billing cycle.


    Exports are not supported for certain assets, such as from the Asset Depot or terrain assets which use a base terrain.
    Check the [exportable](#operation/getAsset) property of the asset to detect availability.'
  humanURL: https://ion.cesium.com/
  baseURL: https://ion.cesium.com/
  tags:
  - Export
  tags_raw:
  - Exports
  properties:
  - type: OpenAPI
    url: openapi/cesium-exports-api-openapi.yml
  - type: JSONSchema
    url: json-schema/cesium-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-asset-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-default-token-schema.json
  - type: JSONSchema
    url: json-schema/cesium-external-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-archive-metadata2-schema.json
- aid: cesium:cesium-labels-api
  name: Cesium Labels API
  description: 'Labels let you organize assets and stories with reusable metadata tags.


    The Labels API provides a mechanism to list, create, update, and delete account labels. Asset-label assignment is documented
    with the asset routes.'
  humanURL: https://ion.cesium.com/
  baseURL: https://ion.cesium.com/
  tags:
  - Labels
  properties:
  - type: OpenAPI
    url: openapi/cesium-labels-api-openapi.yml
  - type: JSONSchema
    url: json-schema/cesium-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-asset-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-default-token-schema.json
  - type: JSONSchema
    url: json-schema/cesium-external-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-archive-metadata2-schema.json
- aid: cesium:cesium-oauth-api
  name: Cesium OAuth API
  description: The Oauth API provides a mechanism to allow third-party applications to access a user's ion account data through
    the Oauth 2.0 authorization framework.
  humanURL: https://ion.cesium.com/
  baseURL: https://ion.cesium.com/
  tags:
  - OAuth
  - Authentication
  tags_raw:
  - Oauth
  - Authentication
  properties:
  - type: OpenAPI
    url: openapi/cesium-oauth-api-openapi.yml
  - type: JSONSchema
    url: json-schema/cesium-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-asset-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-default-token-schema.json
  - type: JSONSchema
    url: json-schema/cesium-external-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-archive-metadata2-schema.json
- aid: cesium:cesium-tokens-api
  name: Cesium Tokens API
  description: 'The Tokens API provides a mechanism to create and manage access tokens.  Access tokens are used to give applications
    access to your ion account, including access to stream your ion assets.


    Every account has a single default token with the `assets:read` and `geocode` scopes.  This token cannot be modified or
    deleted, and provides read access to all assets associated with that user''s ion account.'
  humanURL: https://ion.cesium.com/
  baseURL: https://ion.cesium.com/
  tags:
  - Tokens
  properties:
  - type: OpenAPI
    url: openapi/cesium-tokens-api-openapi.yml
  - type: JSONSchema
    url: json-schema/cesium-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-asset-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-default-token-schema.json
  - type: JSONSchema
    url: json-schema/cesium-external-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-archive-metadata2-schema.json
- aid: cesium:cesium-user-api
  name: Cesium User API
  description: Routes related to the currently authenticated account.
  humanURL: https://ion.cesium.com/
  baseURL: https://ion.cesium.com/
  tags:
  - User
  properties:
  - type: OpenAPI
    url: openapi/cesium-user-api-openapi.yml
  - type: JSONSchema
    url: json-schema/cesium-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-asset-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-schema.json
  - type: JSONSchema
    url: json-schema/cesium-token-metadata-default-token-schema.json
  - type: JSONSchema
    url: json-schema/cesium-external-asset-endpoint-schema.json
  - type: JSONSchema
    url: json-schema/cesium-archive-metadata2-schema.json
x-enrichment:
  date: '2026-10-13'
  status: enriched
  artifacts_added: 17
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Cesium API — frequently asked questions

Does Cesium have an API?

Yes. APIs.io lists 10 APIs from Cesium, including Cesium ion API, Cesium Archives API and Cesium Asset Elements API, and 7 more.

Is there an OpenAPI specification for the Cesium API?

Yes. APIs.io indexes 9 OpenAPI specifications for Cesium, each linked for download from this page.

How much does the Cesium API cost?

Cesium publishes its prices; its Community plan is Free (individual) as of 2026-10-13. APIs.io lists 6 pricing plans for Cesium, with each plan's price, limits and inclusions under Pricing on this page.

Is the Cesium API ready for AI agents?

Cesium has a Kin Score of 41.2 out of 100 (developing) and an Agent Readiness score of 31.0 (agent-ready), scored by API Evangelist on 2026-11-06.

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