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 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

28.5/100 thin ▬ flat Agent 20/100 agent aware saas Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0

AccessPaidSelf serveFree trial⚡ Free to try

1 APIs

Live Streaming Multistreaming Video Hosting VOD VideoRestreamingSub-Second StreamingWebRTC Analytics Webhook

Kin Score

Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0

Composite quality — 28.5/100 · thin

Contract Quality 0.8 / 23

Developer Ergonomics 4.3 / 18

Access Clarity 11.4 / 18

Operational Transparency 3.7 / 12

Contract Governance 0.0 / 11

Discoverability 6.2 / 9

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

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.

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

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

Blog

Blog

Source (apis.yml)

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
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: 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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