RSC

The Royal Society of Chemistry (RSC) provides developer APIs through its ChemSpider platform, enabling programmatic access to one of the world's largest chemistry databases with over 88 million unique chemical compounds. The APIs support compound search, structure retrieval, format conversion, and data enrichment for cheminformatics applications.

RSC publishes 4 API contracts indexed on the APIs.io network, including Filter API, Lookups API, Records API, and 1 more. Tagged areas include Chemistry, Cheminformatics, Chemical Data, and Science.

The RSC catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

RSC’s developer surface includes engineering blog, authentication, developer portal, signup flow, and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

31.9/100 thin ▬ flat Agent 19/100 agent aware Front door AI 3/6 light Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Chemistry CheminformaticsChemical DataScience

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 31.9/100 · thin

Contract Quality 11.0 / 19

Developer Ergonomics 1.8 / 15

Access Clarity 4.7 / 15

Operational Transparency 0.8 / 10

Contract Governance 1.2 / 9

Discoverability 4.3 / 8

Regulatory Posture 3.1 / 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
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

10 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 11.9 — up to +17.6 composite points
Access Clarity scores 31.6 — up to +13.7 composite points
Operational Transparency scores 7.9 — up to +12.0 composite points

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.

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/rsc/apis.yml: open an issue on github.com/api-evangelist/rsc 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 4

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

RSC Filter API

Search and filter chemical compounds by various properties.

RSC Lookups API

Look up reference data such as available data sources.

RSC Records API

Retrieve compound record details, images, and molecular files.

RSC Tools API

Chemical format conversion and validation utilities.

Open Collections 5

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

RSC ChemSpider Compounds API

OPEN COLLECTION

RSC ChemSpider Compounds Filter API

OPEN COLLECTION

RSC ChemSpider Compounds Filter Lookups API

OPEN COLLECTION

RSC ChemSpider Compounds Filter Records API

OPEN COLLECTION

RSC ChemSpider Compounds Filter Tools API

OPEN COLLECTION

RSC API pricing

Not yet checked against RSC's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against RSC's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Rsc Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Rsc Rate Limits

5 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

RSC

SLA

FinOps 1

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

Rsc Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Rsc Context

5 classes · 15 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

RSC — jsonschema rules

5 rules · 3 warnings 2 info

SPECTRAL

RSC API Rules

18 rules · 2 errors 14 warnings 2 info

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

ChemSpider Compound

14 properties

JSON SCHEMA

JSON Structure 1

JSON Structure definitions describing this provider's data shapes.

Rsc Compound Structure

0 properties

JSON STRUCTURE

Examples 3

Example request and response payloads for these APIs.

Rsc Convert Chemical Format Example

2 fields

EXAMPLE

Rsc Filter By Name Example

2 fields

EXAMPLE

Rsc Get Record Details Example

2 fields

EXAMPLE

Security Posture 2

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

Rsc Authentication

apiKey · 1 scheme

SECURITY

Rsc Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Rsc Agentic Access

16 operations · 8 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

Signup

Signup

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Plans

FinOps

TermsOfService

PrivacyPolicy

Company 3

The organization behind the API

Blog

Blog

Website

Website

LinkedIn

Source (apis.yml)

aid: rsc
name: RSC
description: The Royal Society of Chemistry (RSC) provides developer APIs through its ChemSpider platform, enabling programmatic
  access to one of the world's largest chemistry databases with over 88 million unique chemical compounds. The APIs support
  compound search, structure retrieval, format conversion, and data enrichment for cheminformatics applications.
type: Index
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: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
position: Consuming
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/rsc.png
tags:
- Chemistry
- Cheminformatics
- Chemical Data
- Science
created: '2025-03-01'
modified: '2026-10-06'
url: https://raw.githubusercontent.com/api-evangelist/rsc/refs/heads/main/apis.yml
specificationVersion: '0.23'
apis:
- aid: rsc:rsc-filter-api
  name: RSC Filter API
  description: Search and filter chemical compounds by various properties.
  humanURL: https://developer.rsc.org/
  baseURL: https://api.rsc.org/compounds/v1
  tags:
  - Filter
  properties:
  - type: OpenAPI
    url: openapi/rsc-filter-api-openapi.yml
  - type: Documentation
    url: https://developer.rsc.org/compounds-v1/apis
- aid: rsc:rsc-lookups-api
  name: RSC Lookups API
  description: Look up reference data such as available data sources.
  humanURL: https://developer.rsc.org/
  baseURL: https://api.rsc.org/compounds/v1
  tags:
  - Lookups
  properties:
  - type: OpenAPI
    url: openapi/rsc-lookups-api-openapi.yml
  - type: Documentation
    url: https://developer.rsc.org/compounds-v1/apis
- aid: rsc:rsc-records-api
  name: RSC Records API
  description: Retrieve compound record details, images, and molecular files.
  humanURL: https://developer.rsc.org/
  baseURL: https://api.rsc.org/compounds/v1
  tags:
  - Records
  properties:
  - type: OpenAPI
    url: openapi/rsc-records-api-openapi.yml
  - type: Documentation
    url: https://developer.rsc.org/compounds-v1/apis
- aid: rsc:rsc-tools-api
  name: RSC Tools API
  description: Chemical format conversion and validation utilities.
  humanURL: https://developer.rsc.org/
  baseURL: https://api.rsc.org/compounds/v1
  tags:
  - Tools
  properties:
  - type: OpenAPI
    url: openapi/rsc-tools-api-openapi.yml
  - type: Documentation
    url: https://developer.rsc.org/compounds-v1/apis
common:
- type: Plans
  url: plans/rsc-plans-pricing.yml
- type: RateLimits
  url: rate-limits/rsc-rate-limits.yml
- type: FinOps
  url: finops/rsc-finops.yml
- url: https://www.rsc.org/news
  type: Blog
- type: Website
  url: https://rsc.org
- type: AgenticAccess
  url: agentic-access/rsc-agentic-access.yml
- type: DomainSecurity
  url: security/rsc-domain-security.yml
- type: Authentication
  url: authentication/rsc-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/rsc-equipment-rental
- type: Portal
  url: https://developer.rsc.org/
- type: Authentication
  url: https://developer.rsc.org/
- type: Signup
  url: https://developer.rsc.org/
- type: TermsOfService
  url: https://www.rsc.org/legal/
- type: PrivacyPolicy
  url: https://www.rsc.org/help-legal/legal/privacy/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

RSC API — frequently asked questions

Does RSC have an API?

Yes. APIs.io lists 4 APIs from RSC, including RSC Filter API, RSC Lookups API and RSC Records API, and 1 more.

Is there an OpenAPI specification for the RSC API?

Yes. APIs.io indexes 4 OpenAPI specifications for RSC, each linked for download from this page.

How do I authenticate with the RSC API?

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

How much does the RSC API cost?

APIs.io lists 3 pricing plans for RSC, with each plan's price, limits and inclusions under Pricing on this page.

Is the RSC API ready for AI agents?

RSC has a Kin Score of 31.9 out of 100 (thin) and an Agent Readiness score of 19.0 (agent-aware), scored by API Evangelist on 2026-11-06.

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