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 7 more developer resources.

🌐 Visit website 📡 Source on GitHub
44.5/100 developing ▬ flat Agent 31/100 agent aware Full breakdown ↓
scored 2026-08-03 · rubric v0.9
AccessPaidSelf serveFree trial⚡ Free to try
5 APIs
Live StreamingMultistreamingVideo HostingVODVideoRestreamingSub-Second StreamingWebRTCAnalyticsWebhooks

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-03 · rubric v0.9
Composite quality — 44.5/100 · developing
Contract Quality 14.7 / 25
Developer Ergonomics 5.7 / 20
Commercial Clarity 12.6 / 20
Operational Transparency 4.1 / 13
Governance 0.0 / 12
Discoverability 7.4 / 10
Agent readiness — 31/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
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.

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 1

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

Castr API

OPEN COLLECTION

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

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.
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
- Webhooks
created: '2026-07-11'
modified: '2026-07-11'
specificationVersion: '0.19'
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:
  - 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
Where this information came from

This is an independent, third-party profile of Castr, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.

info@apievangelist.com · Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.