Castr website screenshot

Castr

Castr is a live video streaming and multistreaming platform with video hosting (VOD), that lets you ingest a single RTMP/SRT source and restream it to multiple destinations, record and clip live streams, host and deliver on-demand video, run ultra-low-latency sub-second (WebRTC) streams, and embed a player. Castr exposes a documented, self-serve REST API at https://api.castr.com/v2 for managing live streams and their platform destinations, sub-second streams, video hosting folders and uploads, live-to-VOD recordings, activity/analytics logs and events, and webhook endpoints. Requests are authenticated with an API token issued from the account settings and sent in an authorization header.

Castr publishes 5 APIs on the APIs.io network, including Analytics API, Live Streams API, Sub-Second Streams API, and 2 more. Tagged areas include Live Streaming, Multistreaming, Video Hosting, VOD, and Video.

Castr’s developer surface includes authentication, documentation, API reference, signup flow, pricing, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub
38.5/100 thin ▬ flat Agent 20/100 agent aware Front door AI 2/6 trace saas Full breakdown ↓
scored 2026-10-04 · rubric v0.23.0
AccessPaidSelf serveFree trial⚡ Free to try
1 published contract
Live StreamingMultistreamingVideo HostingVODVideoRestreamingSub-Second StreamingWebRTCAnalyticsWebhook

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Developer Platform & API Ecosystem Management
BC-4270
Webhooks
POST /webhook_endpoints

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-04 · rubric v0.23.0
Composite quality — 38.5/100 · thin
Contract Quality 9.5 / 19
Developer Ergonomics 3.6 / 15
Access Clarity 9.0 / 15
Operational Transparency 2.8 / 10
Contract Governance 0.0 / 9
Discoverability 5.0 / 8
Regulatory Posture 1.8 / 15
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 20/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 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 0 / 4
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 0 / 5
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/.
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 github.com/api-evangelist/castr-live: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 5

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

Castr Analytics API

Activity logs, activity events, and stream stats.

Castr Live Streams API

Live streams and their multistream platform destinations.

Castr Sub-Second Streams API

Ultra-low-latency (WebRTC) live streams.

Castr Video Hosting API

Video hosting folders, uploads, and live-to-VOD recordings.

Castr Webhooks API

Webhook endpoints for event delivery.

Open Collections 7

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

API Collection

OPEN COLLECTION

Castr Analytics API

OPEN COLLECTION

Castr Analytics Live Streams API

OPEN COLLECTION

Castr Analytics Sub-Second Streams API

OPEN COLLECTION

Castr Analytics Video Hosting API

OPEN COLLECTION

Castr Analytics Webhooks API

OPEN COLLECTION

Castr API

OPEN COLLECTION

Scroll for all 7

Pricing Plans 1

Published pricing tiers and plan structures.

Castr Live Plans Pricing

6 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Castr Live Rate Limits

6 limits

RATE LIMITS

FinOps 1

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

Castr Live Finops

FINOPS

Security Posture 2

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

Castr Live Authentication

apiKey · 1 scheme

SECURITY

Castr Live Domain Security

TLSv1.2 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Castr Live Agentic Access

31 operations · 18 acting

31 operations · 18 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

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 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 Plans
Plans
 FinOps
FinOps

Company 3

The organization behind the API

Website
Website
 LinkedIn
LinkedIn
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap
CapabilityMap

Source (apis.yml)

apis.yml Raw ↑ 
aid: castr-live
url: https://raw.githubusercontent.com/api-evangelist/castr-live/refs/heads/main/apis.yml
name: Castr
kind: company
description: Castr is a live video streaming and multistreaming platform with video hosting (VOD), that lets you ingest a
  single RTMP/SRT source and restream it to multiple destinations, record and clip live streams, host and deliver on-demand
  video, run ultra-low-latency sub-second (WebRTC) streams, and embed a player. Castr exposes a documented, self-serve REST
  API at https://api.castr.com/v2 for managing live streams and their platform destinations, sub-second streams, video hosting
  folders and uploads, live-to-VOD recordings, activity/analytics logs and events, and webhook endpoints. Requests are authenticated
  with an API token issued from the account settings and sent in an authorization header.
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: paid
  onboarding: self-serve
  trial: true
  try_now: true
  public: false
  label: Paid (free trial) · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/castr-live.png
x-docs-platform: readme
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-09-21
tags:
- Live Streaming
- Multistreaming
- Video Hosting
- VOD
- Video
- Restreaming
- Sub-Second Streaming
- WebRTC
- Analytics
- Webhook
tags_raw:
- Live Streaming
- Multistreaming
- Video Hosting
- VOD
- Video
- Restreaming
- Sub-Second Streaming
- WebRTC
- Analytics
- Webhooks
created: '2026-07-11'
modified: '2026-07-11'
specificationVersion: '0.23'
apis:
- aid: castr-live:castr-live-analytics-api
  name: Castr Analytics API
  description: Activity logs, activity events, and stream stats.
  humanURL: https://developers.castr.com/reference/get_v2-live-streams
  baseURL: https://api.castr.com/v2
  tags:
  - Analytics
  properties:
  - type: OpenAPI
    url: openapi/castr-live-analytics-api-openapi.yml
  - type: Documentation
    url: https://developers.castr.com/docs/getting-started
  - type: APIReference
    url: https://developers.castr.com/reference/get_v2-live-streams
  - type: PostmanCollection
    url: collections/castr-live.postman_collection.json
  - type: OpenCollection
    url: collections/castr-live.opencollection.json
  - type: Documentation
    url: https://developers.castr.com/docs/create-sub-second-streams
  - type: Documentation
    url: https://developers.castr.com/docs/post-a-video
  - type: Documentation
    url: https://developers.castr.com/docs/create-a-livestream-pu
- aid: castr-live:castr-live-live-streams-api
  name: Castr Live Streams API
  description: Live streams and their multistream platform destinations.
  humanURL: https://developers.castr.com/reference/get_v2-live-streams
  baseURL: https://api.castr.com/v2
  tags:
  - Live Streams
  properties:
  - type: OpenAPI
    url: openapi/castr-live-live-streams-api-openapi.yml
  - type: Documentation
    url: https://developers.castr.com/docs/getting-started
  - type: APIReference
    url: https://developers.castr.com/reference/get_v2-live-streams
  - type: PostmanCollection
    url: collections/castr-live.postman_collection.json
  - type: OpenCollection
    url: collections/castr-live.opencollection.json
  - type: Documentation
    url: https://developers.castr.com/docs/create-sub-second-streams
  - type: Documentation
    url: https://developers.castr.com/docs/post-a-video
  - type: Documentation
    url: https://developers.castr.com/docs/create-a-livestream-pu
- aid: castr-live:castr-live-sub-second-streams-api
  name: Castr Sub-Second Streams API
  description: Ultra-low-latency (WebRTC) live streams.
  humanURL: https://developers.castr.com/reference/get_v2-live-streams
  baseURL: https://api.castr.com/v2
  tags:
  - Sub-Second Streams
  properties:
  - type: OpenAPI
    url: openapi/castr-live-sub-second-streams-api-openapi.yml
  - type: Documentation
    url: https://developers.castr.com/docs/getting-started
  - type: APIReference
    url: https://developers.castr.com/reference/get_v2-live-streams
  - type: PostmanCollection
    url: collections/castr-live.postman_collection.json
  - type: OpenCollection
    url: collections/castr-live.opencollection.json
  - type: Documentation
    url: https://developers.castr.com/docs/create-sub-second-streams
  - type: Documentation
    url: https://developers.castr.com/docs/post-a-video
  - type: Documentation
    url: https://developers.castr.com/docs/create-a-livestream-pu
- aid: castr-live:castr-live-video-hosting-api
  name: Castr Video Hosting API
  description: Video hosting folders, uploads, and live-to-VOD recordings.
  humanURL: https://developers.castr.com/reference/get_v2-live-streams
  baseURL: https://api.castr.com/v2
  tags:
  - Video Hosting
  properties:
  - type: OpenAPI
    url: openapi/castr-live-video-hosting-api-openapi.yml
  - type: Documentation
    url: https://developers.castr.com/docs/getting-started
  - type: APIReference
    url: https://developers.castr.com/reference/get_v2-live-streams
  - type: PostmanCollection
    url: collections/castr-live.postman_collection.json
  - type: OpenCollection
    url: collections/castr-live.opencollection.json
  - type: Documentation
    url: https://developers.castr.com/docs/create-sub-second-streams
  - type: Documentation
    url: https://developers.castr.com/docs/post-a-video
  - type: Documentation
    url: https://developers.castr.com/docs/create-a-livestream-pu
- aid: castr-live:castr-live-webhooks-api
  name: Castr Webhooks API
  description: Webhook endpoints for event delivery.
  humanURL: https://developers.castr.com/reference/get_v2-live-streams
  baseURL: https://api.castr.com/v2
  tags:
  - Webhook
  tags_raw:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/castr-live-webhooks-api-openapi.yml
  - type: Documentation
    url: https://developers.castr.com/docs/getting-started
  - type: APIReference
    url: https://developers.castr.com/reference/get_v2-live-streams
  - type: PostmanCollection
    url: collections/castr-live.postman_collection.json
  - type: OpenCollection
    url: collections/castr-live.opencollection.json
  - type: Documentation
    url: https://developers.castr.com/docs/create-sub-second-streams
  - type: Documentation
    url: https://developers.castr.com/docs/post-a-video
  - type: Documentation
    url: https://developers.castr.com/docs/create-a-livestream-pu
common:
- type: CapabilityMap
  url: capabilities/castr-live-capability-edges.yml
  name: Castr Business Capability Map
- type: AgenticAccess
  url: agentic-access/castr-live-agentic-access.yml
- type: DomainSecurity
  url: security/castr-live-domain-security.yml
- type: Authentication
  url: authentication/castr-live-authentication.yml
- type: Website
  url: https://castr.com
- type: LinkedIn
  url: https://www.linkedin.com/company/castr-live
- type: Documentation
  url: https://developers.castr.com/docs/getting-started
- type: APIReference
  url: https://developers.castr.com/reference/get_v2-live-streams
- type: SignUp
  url: https://castr.com/app/manage/api
- type: Pricing
  url: https://castr.com/pricing/
- type: Plans
  url: plans/castr-live-plans-pricing.yml
- type: RateLimits
  url: rate-limits/castr-live-rate-limits.yml
- type: FinOps
  url: finops/castr-live-finops.yml
- type: Blog
  url: https://castr.com/blog/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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