Catchback Cards

Catchback Cards (CatchBack) is a Y Combinator (Winter 2026) company building a mobile and web platform for trading card collectors, focused on Pokemon and sports cards. Collectors open digital mystery packs to receive physical cards, receive instant buyback offers paid out via Venmo or PayPal, and trade cards through a $1 marketplace. The platform differentiates on transparency: it lets creators build custom mystery packs with personalized chases and customized odds using cryptographically trusted tooling, and publishes open-source verification so collectors can independently validate pack randomness and odds. The company launched its iOS app on January 25, 2026 and is a seven-person team based in San Francisco. Catchback Cards is a consumer application and does not currently publish a public API, developer portal, or OpenAPI definition; this profile is maintained in the API Evangelist network as a portfolio lead and is enriched only with independently verifiable facts.

Catchback Cards is profiled on the APIs.io network. Tagged areas include Company, Trading Cards, Collectibles, Marketplace, and Consumer.

🌐 Visit website 📡 Profile data on GitHub

3.0/100 minimal ▬ flat Agent 0/100 human only Front door AI 1/6 silent Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

0 APIs

Company Trading Cards Collectibles Marketplace Consumer Mobile Payments Y Combinator

Kin Score

Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0

Composite quality — 3.0/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.3 / 11

Contract Governance 0.0 / 10

Discoverability 4.1 / 9

Regulatory Posture 0.8 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 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 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Payments 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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<a href="https://apis.io/providers/catchback-cards/"><img src="https://apis.io/badge/catchback-cards/card.svg" alt="Catchback Cards on APIs.io — Kin Score by API Evangelist"></a>

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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 github.com/api-evangelist/catchback-cards: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Mobile SDK Publishers (Play SDK Index, CocoaPods, ADA certification)	undeclared	-	-	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Security Posture 1

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

Catchback Cards Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: catchback-cards
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/catchback-cards.png
name: Catchback Cards
description: 'Catchback Cards (CatchBack) is a Y Combinator (Winter 2026) company building a mobile and web platform for trading
  card collectors, focused on Pokemon and sports cards. Collectors open digital mystery packs to receive physical cards, receive
  instant buyback offers paid out via Venmo or PayPal, and trade cards through a $1 marketplace. The platform differentiates
  on transparency: it lets creators build custom mystery packs with personalized chases and customized odds using cryptographically
  trusted tooling, and publishes open-source verification so collectors can independently validate pack randomness and odds.
  The company launched its iOS app on January 25, 2026 and is a seven-person team based in San Francisco. Catchback Cards
  is a consumer application and does not currently publish a public API, developer portal, or OpenAPI definition; this profile
  is maintained in the API Evangelist network as a portfolio lead and is enriched only with independently verifiable facts.'
url: https://raw.githubusercontent.com/api-evangelist/catchback-cards/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
x-batch: W26
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Trading Cards
- Collectibles
- Marketplace
- Consumer
- Mobile
- Payments
- Y Combinator
common:
- type: DomainSecurity
  url: security/catchback-cards-domain-security.yml
- type: Website
  url: https://catchbackcards.com
- type: GitHubOrganization
  url: https://github.com/CatchBack-Cards
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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