Stamped

Stamped is a reviews, ratings, and loyalty platform for e-commerce brands on Shopify, BigCommerce, and custom/headless platforms. Its V3 API is organized into three domains: Merchant Data (customers, products, orders), Loyalty Operations (points adjustments, VIP tiers, reward redemption, activities, and program reporting), and Reviews. Authentication is a shop-scoped Private API Key sent in the stamped-api-key header. Surfaced as a portfolio company of GV and enriched by the API Evangelist pipeline from Stamped's public developer documentation at developers.stamped.io.

Stamped publishes 5 APIs on the APIs.io network, including Customer Actions API, Customers API, Orders API, and 2 more. Tagged areas include Company, Consumer, Reviews, Ratings, and Loyalty.

Stamped’s developer surface includes documentation, API reference, getting-started guide, support, authentication, and 14 more developer resources.

🌐 Visit website 📡 Source on GitHub
34.2/100 thin ▬ flat Agent 36/100 agent ready Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0
AccessSelf serve
5 APIs 1 MCP Servers
CompanyConsumerReviewsRatingsLoyaltyE-CommerceCustomer MarketingShopify

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0
Composite quality — 34.2/100 · thin
Contract Quality 13.4 / 25
Developer Ergonomics 9.6 / 20
Access Clarity 0.0 / 20
Operational Transparency 1.0 / 13
Contract Governance 2.0 / 12
Discoverability 8.2 / 10
Agent readiness — 36/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 6 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 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/stamped: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 5

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

Stamped Customer Actions API

The Customer Actions API from Stamped — 6 operation(s) for customer actions.

Stamped Customers API

The Customers API from Stamped — 3 operation(s) for customers.

Stamped Orders API

The Orders API from Stamped — 3 operation(s) for orders.

Stamped Products API

The Products API from Stamped — 3 operation(s) for products.

Stamped Program Reporting API

The Program Reporting API from Stamped — 2 operation(s) for program reporting.

Open Collections 6

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Loyalty Operations Customer Actions API

OPEN COLLECTION

Loyalty Operations Customer Actions Customers API

OPEN COLLECTION

Loyalty Operations Customer Actions Orders API

OPEN COLLECTION

Loyalty Operations Customer Actions Products API

OPEN COLLECTION

Loyalty Operations Customer Actions Program Reporting API

OPEN COLLECTION

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Stamped MCP Server

MCP SERVER

Security Posture 2

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

Stamped Authentication

apiKey · 1 scheme

SECURITY

Stamped Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Stamped Agentic Access

26 operations · 15 acting

26 operations · 15 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 AgenticAccess
AgenticAccess
 MCPServer
MCPServer
 AgentSkill
AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 ErrorCatalog
ErrorCatalog
 DataModel
DataModel
 Conformance
Conformance
 Lifecycle
Lifecycle

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 2

Status, limits, changes, and where to get help

Support
Support
 Deprecation
Deprecation

Company 1

The organization behind the API

Website
Website

Other 1

Properties that don't map to a standard resource type

Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
aid: stamped
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/stamped.png
name: Stamped
description: 'Stamped is a reviews, ratings, and loyalty platform for e-commerce brands on Shopify, BigCommerce, and custom/headless
  platforms. Its V3 API is organized into three domains: Merchant Data (customers, products, orders), Loyalty Operations (points
  adjustments, VIP tiers, reward redemption, activities, and program reporting), and Reviews. Authentication is a shop-scoped
  Private API Key sent in the stamped-api-key header. Surfaced as a portfolio company of GV and enriched by the API Evangelist
  pipeline from Stamped''s public developer documentation at developers.stamped.io.'
url: https://raw.githubusercontent.com/api-evangelist/stamped/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- gv
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Consumer
- Reviews
- Ratings
- Loyalty
- E-Commerce
- Customer Marketing
- Shopify
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- aid: stamped:stamped-customer-actions-api
  name: Stamped Customer Actions API
  description: The Customer Actions API from Stamped — 6 operation(s) for customer actions.
  humanURL: https://developers.stamped.io/docs/merchant-apis
  baseURL: https://stamped.io/api/v3/merchant
  tags:
  - Customer Actions
  properties:
  - type: OpenAPI
    url: openapi/stamped-customer-actions-api-openapi.yml
- aid: stamped:stamped-customers-api
  name: Stamped Customers API
  description: The Customers API from Stamped — 3 operation(s) for customers.
  humanURL: https://developers.stamped.io/docs/merchant-apis
  baseURL: https://stamped.io/api/v3/merchant
  tags:
  - Customers
  properties:
  - type: OpenAPI
    url: openapi/stamped-customers-api-openapi.yml
- aid: stamped:stamped-orders-api
  name: Stamped Orders API
  description: The Orders API from Stamped — 3 operation(s) for orders.
  humanURL: https://developers.stamped.io/docs/merchant-apis
  baseURL: https://stamped.io/api/v3/merchant
  tags:
  - Order
  tags_raw:
  - Orders
  properties:
  - type: OpenAPI
    url: openapi/stamped-orders-api-openapi.yml
- aid: stamped:stamped-products-api
  name: Stamped Products API
  description: The Products API from Stamped — 3 operation(s) for products.
  humanURL: https://developers.stamped.io/docs/merchant-apis
  baseURL: https://stamped.io/api/v3/merchant
  tags:
  - Product
  tags_raw:
  - Products
  properties:
  - type: OpenAPI
    url: openapi/stamped-products-api-openapi.yml
- aid: stamped:stamped-program-reporting-api
  name: Stamped Program Reporting API
  description: The Program Reporting API from Stamped — 2 operation(s) for program reporting.
  humanURL: https://developers.stamped.io/docs/merchant-apis
  baseURL: https://stamped.io/api/v3/merchant
  tags:
  - Program Reporting
  properties:
  - type: OpenAPI
    url: openapi/stamped-program-reporting-api-openapi.yml
common:
- type: Overlay
  url: overlays/stamped-loyalty-operations-overlay.yaml
- type: DomainSecurity
  url: security/stamped-domain-security.yml
- type: Website
  url: https://stamped.io
- type: DeveloperPortal
  url: https://developers.stamped.io
- type: Documentation
  url: https://developers.stamped.io/docs/getting-started
- type: APIReference
  url: https://developers.stamped.io/reference/
- type: GettingStarted
  url: https://developers.stamped.io/docs/getting-started
- type: Support
  url: https://stampedsupport.zendesk.com/hc/en-us
- type: LLMsTxt
  url: llms/stamped-llms.txt
- type: Authentication
  url: authentication/stamped-authentication.yml
- type: AgenticAccess
  url: agentic-access/stamped-agentic-access.yml
- type: Conventions
  url: conventions/stamped-conventions.yml
- type: ErrorCatalog
  url: errors/stamped-problem-types.yml
- type: DataModel
  url: data-model/stamped-data-model.yml
- type: MCPServer
  url: mcp/stamped-mcp.yml
- type: Conformance
  url: conformance/stamped-conformance.yml
- type: Lifecycle
  url: lifecycle/stamped-lifecycle.yml
- type: Deprecation
  url: lifecycle/stamped-lifecycle.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 18
  pass: local-v1