CardVolume

CardVolume provides documented sales, graded populations and plain‑language research for trading cards that collectors search for. It tracks every price to a sale, publishes market indexes and record sales for categories such as Pokémon, Magic, Yu‑Gi‑Oh! and sports cards, and shows sources and data timestamps. The service does not display asking prices or averages and marks data as “unknown” when evidence is thin.

CardVolume is listed with 1 API on the APIs.io network. Tagged areas include CardVolume, Trading Cards, Collectibles, and Market Data.

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

CardVolume’s developer surface includes pricing, API reference, and 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

10.4/100 minimal Agent 9/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 API 1 MCP Servers

CardVolumeTrading Cards Collectibles Market Data

Kin Score

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

Composite quality — 10.4/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.6 / 17

Access Clarity 2.7 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 4.5 / 9

Regulatory Posture 2.1 / 15

Agent readiness — 9/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 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 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

9 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 3.6 — up to +19.3 composite points
Access Clarity scores 15.8 — up to +16.8 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/cardvolume-com/apis.yml: open an issue on github.com/api-evangelist/cardvolume-com 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.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

APIs 1

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

CardVolume API

Read‑only public data API for verified trading‑card sales.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

CardVolume MCP Server

Remote MCP server at cardvolume.com.

MCP SERVER

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

CardVolume API Rules

34 rules · 32 errors 1 warnings 1 info

SPECTRAL

Security Posture 1

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

Cardvolume Com Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

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

Cardvolume Com Agentic Access

5 operations

5 operations · 0 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

LLMsTxt

MCPServer

WellKnown

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

ErrorCatalog

ErrorCatalog

Conformance

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Pricing

Pricing

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: cardvolume-com
name: CardVolume
description: CardVolume provides documented sales, graded populations and plain‑language research for trading cards that collectors
  search for. It tracks every price to a sale, publishes market indexes and record sales for categories such as Pokémon, Magic,
  Yu‑Gi‑Oh! and sports cards, and shows sources and data timestamps. The service does not display asking prices or averages
  and marks data as “unknown” when evidence is thin.
url: https://artifacts.apis.io/cardvolume-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-03 (modular-v1; was harvest)
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.20'
created: '2026-11-03'
modified: '2026-11-03'
tags:
- CardVolume
- Trading Cards
- Collectibles
- Market Data
tags_raw:
- CardVolume
- Trading Cards
- Collectibles
- Market Data
- API
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/cardvolume-com-agentic-access.yml
- type: Spectral
  url: rules/cardvolume-com-rules.yml
- type: ErrorCatalog
  url: errors/cardvolume-com-problem-types.yml
- type: Conformance
  url: conformance/cardvolume-com-conformance.yml
- type: LLMsTxt
  url: llms/cardvolume-com-llms.txt
- type: MCPServer
  url: mcp/cardvolume-com-mcp.yml
- type: WellKnown
  url: well-known/cardvolume-com-well-known.yml
- type: Hosts
  url: hosts/cardvolume-com-hosts.yml
- type: Vendors
  url: vendors/cardvolume-com-vendors.yml
- type: TermsOfService
  url: https://cardvolume.com/terms/
- type: PrivacyPolicy
  url: https://cardvolume.com/privacy/
- type: Pricing
  url: https://cardvolume.com/learn/pricing/
- type: APIReference
  url: https://cardvolume.com/developers/
- type: DomainSecurity
  url: security/cardvolume-com-domain-security.yml
- type: Website
  url: https://cardvolume.com/
apis:
- name: CardVolume API
  description: Read‑only public data API for verified trading‑card sales.
  humanURL: https://cardvolume.com/developers/
  baseURL: https://cardvolume.com/api/v1
  aid: cardvolume-com:cardvolume-api
x-enrichment:
  date: '2026-11-03'
  status: enriched
  artifacts_added: 16
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

CardVolume API — frequently asked questions

Does CardVolume have an API?

Yes. APIs.io lists 1 API from CardVolume, including CardVolume API.

Does CardVolume have an MCP server?

Yes. APIs.io lists 1 MCP server for CardVolume: Remote MCP server at cardvolume.com.

Is the CardVolume API ready for AI agents?

CardVolume has a Kin Score of 10.4 out of 100 (minimal) and an Agent Readiness score of 8.8 (agent-aware), scored by API Evangelist on 2026-11-06.

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