SidelineSwap

SidelineSwap is an online marketplace where athletes buy and sell new and used sports equipment across hockey, baseball, softball, lacrosse, football, golf, soccer, skiing, snowboarding and more. Sellers list gear for free, while SidelineSwap handles payments, prepaid shipping labels and buyer protection, and pro shops and teams manage consignment inventory. The company operates a developer portal at developer.sidelineswap.com with a login-gated Inventory API plus REST services on api.sidelineswap.com for identity, commerce and secure payments, enabling partners and pro sellers to sync listings programmatically.

SidelineSwap publishes 1 API on the APIs.io network. Tagged areas include Company, Marketplace, Sports, Sporting Goods, and E-Commerce.

SidelineSwap’s developer surface includes documentation, API reference, support, engineering blog, signup flow, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

21.4/100 emerging ▬ flat Agent 0/100 human only saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Company Marketplace Sports Sporting Goods E-Commerce Commerce Inventory Resale Consignment

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 21.4/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 6.7 / 20

Access Clarity 6.8 / 20

Operational Transparency 0.3 / 13

Contract Governance 0.0 / 12

Discoverability 7.6 / 10

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

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.

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/sidelineswap: 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 →

APIs 1

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

SidelineSwap API

Authenticated REST API surface behind the SidelineSwap developer portal — identity (IAM), commerce and secure payments on api.sidelineswap.com, plus a partner Inventory API (dev...

Security Posture 1

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

Sidelineswap Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

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 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: sidelineswap
name: SidelineSwap
description: SidelineSwap is an online marketplace where athletes buy and sell new and used sports equipment across hockey,
  baseball, softball, lacrosse, football, golf, soccer, skiing, snowboarding and more. Sellers list gear for free, while SidelineSwap
  handles payments, prepaid shipping labels and buyer protection, and pro shops and teams manage consignment inventory. The
  company operates a developer portal at developer.sidelineswap.com with a login-gated Inventory API plus REST services on
  api.sidelineswap.com for identity, commerce and secure payments, enabling partners and pro sellers to sync listings programmatically.
url: https://raw.githubusercontent.com/api-evangelist/sidelineswap/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  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://sidelineswap.com/_next/static/media/icon-72x72.3rxm6dor5innp.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- 500-global
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Marketplace
- Sports
- Sporting Goods
- E-Commerce
- Commerce
- Inventory
- Resale
- Consignment
tags_raw:
- Company
- Marketplace
- Sports
- Sporting Goods
- Ecommerce
- Commerce
- Inventory
- Resale
- Consignment
apis:
- name: SidelineSwap API
  description: Authenticated REST API surface behind the SidelineSwap developer portal — identity (IAM), commerce and secure
    payments on api.sidelineswap.com, plus a partner Inventory API (developer.sidelineswap.com/api/v1) for syncing pro-seller
    and consignment listings. Documentation is published in the login-gated developer portal.
  humanURL: https://developer.sidelineswap.com
  baseURL: https://api.sidelineswap.com
  properties:
  - type: DeveloperPortal
    url: https://developer.sidelineswap.com
  - type: Documentation
    url: https://developer.sidelineswap.com/docs
  - type: APIReference
    url: https://developer.sidelineswap.com/docs
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/sidelineswap-domain-security.yml
- type: LLMsTxt
  url: llms/sidelineswap-llms.txt
- type: Website
  url: https://sidelineswap.com
- type: DeveloperPortal
  url: https://developer.sidelineswap.com
- type: Documentation
  url: https://developer.sidelineswap.com/docs
- type: APIReference
  url: https://developer.sidelineswap.com/docs
- type: GitHubOrganization
  url: https://github.com/SidelineSwap
- type: Support
  url: https://help.sidelineswap.com
- type: Blog
  url: https://sidelineswap.com/blog
- type: SignUp
  url: https://sidelineswap.com/register
- type: TermsOfService
  url: https://sidelineswap.com/terms
- type: PrivacyPolicy
  url: https://sidelineswap.com/privacy
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 2
  pass: local-v1

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