# Underdog

**Canonical:** https://apis.io/providers/underdog/  
**Website:** https://underdog.shop/  
**APIs profiled:** 4

Underdog (legal entity Older is Better, RCS Nantes 918 609 629) is a French direct-to-consumer retailer of professionally refurbished large home appliances and televisions — washing machines, fridges, dishwashers, tumble dryers, ovens, cookers, freezers, wine cabinets, TVs and Thermomix — reconditioned in France and sold at up to 50% below new with a two-year warranty, delivery, installation and old-appliance takeback. It is a circular-economy / climate-tech company backed by Serena. Underdog has no developer programme and publishes no OpenAPI, but its storefront runs on Shopify and it exposes a genuine, live agent-commerce surface on its own domain: an /llms.txt and /agents.md agent instruction document, a Universal Commerce Protocol (UCP) merchant profile at /.well-known/ucp, two anonymously-listable remote MCP endpoints (a 13-tool UCP commerce server and a 1-tool storefront policy server), an introspectable Shopify Storefront GraphQL API, RFC 8414 / RFC 9728 OAuth metadata, and read-only product and collection JSON endpoints.

## Kin Score — 31.0 / 100 (thin)

Scored 2026-09-08 under rubric 0.20.0. Trend: flat (+0.0 from 31.0).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 37.2 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 10.5 |
| Developer Ergonomics | 33.3 |
| Commercial Clarity | 27.6 |
| Access Clarity | 27.6 |

## Agent readiness — 32.1 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | bearer |
| Idempotency | documented |
| Error Semantics | documented |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | yes |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | platform |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## APIs (4)

- **Underdog UCP Commerce MCP API** — The Universal Commerce Protocol (UCP) shopping service Underdog serves from its own domain. A remote MCP endpoint that answers tools/list anonymously with 13 tools covering cata...
- **Underdog Storefront GraphQL API** — The Shopify Storefront GraphQL API as served on underdog.shop. It answers introspection anonymously and exposes 424 types, 35 root query fields (products, collections, search, p...
- **Underdog Storefront Policy MCP API** — A second remote MCP endpoint on underdog.shop that answers tools/list anonymously with a single natural-language tool, search_shop_policies_and_faqs, for questions about the sto...
- **Underdog Storefront JSON Endpoints** — Read-only, unauthenticated JSON representations of the Underdog catalogue published by the Shopify storefront: /products.json, /products/{handle}.json, /collections/{handle}/pro...

## MCP servers (1)

- **Underdog MCP Server**

## Security (1)

- **Underdog Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Tags

Company, Climate Tech, Circular Economy, Refurbished Electronics, Home Appliances, Retail, E-Commerce, Shopify, Agentic Commerce, Universal Commerce Protocol, MCP, GraphQL, France

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/underdog/). Scores are computed from the provider's own public artifacts under a published rubric.