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 API contracts indexed 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.

The Castr catalog on APIs.io includes 1 Spectral governance ruleset.

Castr’s developer surface includes authentication, documentation, API reference, signup flow, pricing, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

31.3/100 thin ▬ flat Agent 19/100 agent aware Front door AI 2/6 trace Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessPaidSelf serveFree trial⚡ Free to try

1 published contract

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

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 How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 31.3/100 · thin

Contract Quality 9.5 / 19

Developer Ergonomics 4.8 / 15

Access Clarity 3.8 / 15

Operational Transparency 0.7 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 0.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 19/100 · 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

Pagination 0 / 5

Distinct Operations 3 / 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 Ask about this →
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) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

10 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 25.5 — up to +14.9 composite points Ask about this →
Developer Ergonomics scores 32.1 — up to +13.6 composite points Ask about this →
Contract Quality scores 50.7 — up to +12.3 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/castr-live/apis.yml: open an issue on github.com/api-evangelist/castr-live 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 1

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.

OpenAPI

measured — observed by APIs.io (published)

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 6

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

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

Castr API pricing

Not yet checked against Castr's own pricing page. Compiled by API Evangelist on 2026-07-11 from castr.com/pricing/; confirm before you rely on a figure.

Plan	Price
Starter paid	$16.67 per subscription / month
Standard paid	$41.67 per subscription / month
Premium paid	$166.67 per subscription / month
Ultra paid	$291.67 per subscription / month
Events / OTT paid	$624.99 per subscription / month
Custom / Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

API Requests: not published requests
Concurrent Streams: per plan streams
Multistream Destinations: per plan destinations

Compiled by API Evangelist, not yet checked against Castr's documentation. All 6 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Castr Plans Pricing

6 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Castr Rate Limits

6 limits

RATE LIMITS

FinOps 1

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

Castr Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Castr API Rules

55 rules · 52 error-severity 1 warn-severity 2 info-severity

SPECTRAL

Security Posture 2

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

Castr Authentication

apiKey · 1 scheme

SECURITY

Castr Domain Security

TLSv1.2 · HSTS · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Castr 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 4

The organization behind the API

BlogRSS

BlogRSS

Website

Website

LinkedIn

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

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
  gated: none
  gated_source:
  - onboarding
  label: Paid (free trial) · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  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: '2026-10-06'
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:
- url: https://castr.com/blog/feed.xml
  type: BlogRSS
- 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

Castr API — frequently asked questions

Does Castr have an API?

Yes. APIs.io lists 5 APIs from Castr, including Castr Analytics API, Castr Live Streams API and Castr Sub-Second Streams API, and 2 more.

Is there an OpenAPI specification for the Castr API?

Yes. APIs.io indexes 5 OpenAPI specifications for Castr, each linked for download from this page.

How do I authenticate with the Castr API?

Castr uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Castr Authentication.

How much does the Castr API cost?

APIs.io lists 6 pricing plans for Castr, with each plan's price, limits and inclusions under Pricing on this page.

Is the Castr API ready for AI agents?

Castr has a Kin Score of 31.3 out of 100 (thin) and an Agent Readiness score of 19.0 (agent-aware), scored by API Evangelist on 2026-11-13.

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get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
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apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
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