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

42.7/100 developing ▬ flat Agent 20/100 agent aware Full breakdown ↓
scored 2026-08-24 · rubric v0.13.0

AccessPaidSelf serveFree trial⚡ Free to try

5 APIs

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

Kin Score

Kin Score How this is scored →
scored 2026-08-24 · rubric v0.13.0

Composite quality — 42.7/100 · developing

Contract Quality 14.0 / 25

Developer Ergonomics 4.5 / 20

Access Clarity 12.6 / 20

Operational Transparency 4.1 / 13

Contract Governance 0.0 / 12

Discoverability 7.4 / 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

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. 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. Want it done for you? Prioritized profiling — $2,500 →

APIs 5

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

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.

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.
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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