Alt

Alt (alt.xyz) is an alternative-asset platform for high-value graded trading cards, founded by Leore Avidar, who previously co-founded the address and print API company Lob. Alt lets collectors and investors research, value, buy, sell, vault, and borrow against slabbed cards in one place, spanning baseball, basketball, football, hockey, soccer, golf, tennis, racing and combat-sports cards as well as Pokemon and other trading-card games. The platform combines a fixed-price marketplace, timed and "Liquid" auctions, an Instant Pricer, market-trend and research views, a physical vault in Delaware that removes sales tax from transactions, and card-backed lending. Its pricing engine, Alt Value, is a machine-learning model tuned by card-pricing specialists that produces a real-time value for every BGS, PSA and SGC card vaulted with Alt, and that value underwrites every trade, loan and product on the platform. Alt raised a $75M Series B in November 2021 led by Spearhead with Seven Seven Six and a group of professional athletes. Alt publishes no public developer program: there is no developer portal, API reference, OpenAPI definition, SDK, CLI, sandbox or self-service API signup. Its programmatic surface is the private backend behind the alt.xyz web and mobile applications (a FastAPI/GraphQL platform service, with the engineering organisation on GitHub as github.com/onlyalt), which integrates payment, identity-verification, authentication, lending-servicing and shipping vendors but is neither documented nor offered to third parties.

Alt is profiled on the APIs.io network. Tagged areas include Company, Collectibles, Trading Cards, Sports Cards, and Alternative Assets.

Alt’s developer surface includes engineering blog, support, pricing, signup flow, and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub
17.8/100 emerging ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
0 APIs
CompanyCollectiblesTrading CardsSports CardsAlternative AssetsMarketplaceAuctionsAsset ValuationMachine LearningLendingFintechE-Commerce

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 17.8/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 1.3 / 20
Commercial Clarity 8.9 / 20
Operational Transparency 0.7 / 13
Governance 0.0 / 12
Discoverability 6.9 / 10
Agent readiness — 0/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
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
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/alt: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Security Posture 1

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

Alt Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

SignUp
SignUp
 Login
Login

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support
Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 6

The organization behind the API

Website
Website
 About
About
 Blog
Blog
 Careers
Careers
 LinkedIn
LinkedIn
 Crunchbase
Crunchbase

Other 1

Properties that don't map to a standard resource type

SecondaryMarket
SecondaryMarket

Source (apis.yml)

apis.yml Raw ↑ 
aid: alt
name: Alt
description: 'Alt (alt.xyz) is an alternative-asset platform for high-value graded trading cards, founded by Leore Avidar,
  who previously co-founded the address and print API company Lob. Alt lets collectors and investors research, value, buy,
  sell, vault, and borrow against slabbed cards in one place, spanning baseball, basketball, football, hockey, soccer, golf,
  tennis, racing and combat-sports cards as well as Pokemon and other trading-card games. The platform combines a fixed-price
  marketplace, timed and "Liquid" auctions, an Instant Pricer, market-trend and research views, a physical vault in Delaware
  that removes sales tax from transactions, and card-backed lending. Its pricing engine, Alt Value, is a machine-learning
  model tuned by card-pricing specialists that produces a real-time value for every BGS, PSA and SGC card vaulted with Alt,
  and that value underwrites every trade, loan and product on the platform. Alt raised a $75M Series B in November 2021 led
  by Spearhead with Seven Seven Six and a group of professional athletes. Alt publishes no public developer program: there
  is no developer portal, API reference, OpenAPI definition, SDK, CLI, sandbox or self-service API signup. Its programmatic
  surface is the private backend behind the alt.xyz web and mobile applications (a FastAPI/GraphQL platform service, with
  the engineering organisation on GitHub as github.com/onlyalt), which integrates payment, identity-verification, authentication,
  lending-servicing and shipping vendors but is neither documented nor offered to third parties.'
url: https://raw.githubusercontent.com/api-evangelist/alt/refs/heads/main/apis.yml
image: https://alt.xyz/logo.svg
x-type: company
x-source: harvest:secondary-market
x-harvest-source-url: https://forgeglobal.com/alt_stock/
x-tier: profiled
x-tier-reason: enrichment-pass
specificationVersion: '0.20'
created: '2026-08-02'
modified: '2026-08-02'
tags:
- Company
- Collectibles
- Trading Cards
- Sports Cards
- Alternative Assets
- Marketplace
- Auctions
- Asset Valuation
- Machine Learning
- Lending
- Fintech
- E-Commerce
apis: []
x-enrichment:
  date: '2026-08-02'
  status: enriched
  artifacts_added: 3
  pass: local-v1
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/alt-domain-security.yml
- type: Website
  url: https://alt.xyz/
- type: About
  url: https://alt.xyz/company
- type: Blog
  url: https://alt.xyz/blog
- type: Support
  url: https://support.alt.xyz/
- type: Pricing
  url: https://support.alt.xyz/en/articles/9682168-alt-fees
- type: SignUp
  url: https://alt.xyz/signup
- type: Login
  url: https://alt.xyz/login
- type: TermsOfService
  url: https://alt.xyz/terms
- type: PrivacyPolicy
  url: https://alt.xyz/privacy
- type: GitHubOrganization
  url: https://github.com/onlyalt
- type: Careers
  url: https://job-boards.greenhouse.io/alt
- type: LinkedIn
  url: https://www.linkedin.com/company/altxyzofficial
- type: Crunchbase
  url: https://www.crunchbase.com/organization/alt-xyz
- type: SecondaryMarket
  url: https://forgeglobal.com/alt_stock/
- type: LLMsTxt
  url: llms/alt-llms.txt