Castor
Castor (Castor EDC / CDMS) is a cloud electronic data capture (EDC) and clinical data management platform for clinical trials and real-world research. Its RESTful API at https://data.castoredc.com/api exposes study configuration and collected data - studies, participants (records), institutes (sites), users, fields and field metadata, study data points, repeating data (reports), surveys and survey packages, audit trail, and batch data export - authenticated with OAuth2 client-credentials. The API is used to integrate Castor with external systems, automate data entry and extraction, and support statistical analysis via the official R and Python wrapper packages.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Castor the way a machine reads it — 32 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Castor scores 41.5/100 (developing), with a separate agent-readiness read of 25/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-10 · rubric v0.20.0
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</a>[](https://providers.apievangelist.com/providers/castoredc/)<!-- Kin Score · API Evangelist -->
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title="Castor on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/castoredc/card.svg"
alt="Castor Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Castor
Each block below is one kind of artifact we hold for Castor. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 11
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Castor Audit Trail API
Immutable audit trail of study changes.
Castor Data Export API
Bulk export of study data, structure, and option groups.
Castor Fields API
Study fields and their metadata (dependencies, option groups, validations).
Castor Institutes API
Institutes (sites / centers) participating in a study.
Castor Metadata API
Reference metadata such as countries.
Castor Participants API
Participants (records / subjects) enrolled in a study.
Castor Reports API
Reports / repeating data and their instances.
Castor Studies API
Studies accessible to the API client.
Castor Study Data Points API
Collected values for study forms.
Castor Surveys API
Surveys, survey packages, and ePRO.
Castor Users API
Users and study membership.
Scroll within the panel for all 11 ·
Open Collections 13
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONCastor EDC / CDMS Audit Trail API
OPEN COLLECTIONCastor EDC / CDMS Audit Trail Data Export API
OPEN COLLECTIONCastor EDC / CDMS Audit Trail Fields API
OPEN COLLECTIONCastor EDC / CDMS Audit Trail Institutes API
OPEN COLLECTIONCastor EDC / CDMS Audit Trail Metadata API
OPEN COLLECTIONCastor EDC / CDMS Audit Trail Participants API
OPEN COLLECTIONCastor EDC / CDMS Audit Trail Reports API
OPEN COLLECTIONCastor EDC / CDMS Audit Trail Studies API
OPEN COLLECTIONCastor EDC / CDMS Audit Trail Study Data Points API
OPEN COLLECTIONCastor EDC / CDMS Audit Trail Surveys API
OPEN COLLECTIONCastor EDC / CDMS Audit Trail Users API
OPEN COLLECTIONCastor EDC / CDMS API
OPEN COLLECTIONScroll within the panel for all 13 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Castoredc Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Castoredc Finops
FINOPSSecurity Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Castor — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Access & Security 4
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/castoredc · machine-readable index on apis.io
This is an independent, third-party profile of Castor, 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.
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you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.