# Checkmate

**Canonical:** https://apis.io/providers/checkmate/  
**Website:** https://joincheckmate.com  
**APIs profiled:** 1

Checkmate is a shopping intelligence and data company whose network powers three products: Checkmate for consumers (a browser extension and mobile app that automatically finds the best price and applies working discount codes across 284,000+ merchants for 5M+ monthly shoppers), Mate for brands (AI-powered revenue intelligence), and OpenStock for publishers and agents. OpenStock is a commerce API and Model Context Protocol (MCP) server that exposes the entire Checkmate network through a single endpoint — letting AI agents, shopping copilots, and applications discover merchants, pull live catalogues and offers, generate real merchant-backed discount codes, check availability, and attribute orders. Backed by GV (Google Ventures).

## Kin Score — 40.3 / 100 (developing)

Scored 2026-08-30 under rubric 0.17.2. Trend: flat (-0.6 from 40.9).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 48.8 |
| Governance | 4.5 |
| Contract Governance | 4.5 |
| Operational Transparency | 10.5 |
| Developer Ergonomics | 47.0 |
| Commercial Clarity | 34.2 |
| Access Clarity | 34.2 |

Regulatory layer — **Payments**: 48.4 (matched via tags).

## Agent readiness — 25.4 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | bearer |
| Idempotency | documented |
| Error Semantics | verified |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | derived |
| 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 | no |

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (3)

- **Checkmate Health API** — The Health API from Checkmate — 1 operation(s) for health.
- **Checkmate Merchants API** — The Merchants API from Checkmate — 2 operation(s) for merchants.
- **Checkmate Shoppers API** — The Shoppers API from Checkmate — 1 operation(s) for shoppers.

## MCP servers (1)

- **Checkmate MCP Server** — OpenStock by Checkmate — "the world's largest MCP for ecommerce." A single Model Context Protocol server that exposes catalogues, offers, and merchant-backed discount-code gener...

## Security (3)

- **Checkmate Authentication** — http · 1 scheme
- **Checkmate Domain Security** — TLSv1.3 · HSTS · DMARC
- **Checkmate Vulnerability Disclosure** — security.txt · contact published

## Tags

Company, Consumer, Commerce, E-Commerce, Shopping, Discount Codes, Coupons, Merchants, MCP, Agentic Commerce, Retail

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