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 API contracts indexed 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.

The Stamped catalog on APIs.io includes 1 Spectral governance ruleset.

Stamped’s developer surface includes documentation, API reference, getting-started guide, support, authentication, and 16 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

34.4/100 thin ▬ flat Agent 26/100 agent aware Front door AI 1/6 silent Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

2 published contracts 2 Agent Skills

Company Consumer Reviews Ratings Loyalty E-Commerce Customer Marketing Shopify Loyalty & Incentives

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Customer Relationship Management

BC-420

Customer ActionsCustomersProgram Reporting

POST /api/v3/loyalty/shops/{shopId}/customers/{customerId}/adjust-points POST /api/v3/merchant/shops/{shopId}/customers GET /api/v3/merchant/shops/{shopId}/customers GET /api/v3/merchant/shops/{shopId}/customers/lookup

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 34.4/100 · thin

Contract Quality 9.8 / 19

Developer Ergonomics 8.5 / 15

Access Clarity 0.0 / 15

Operational Transparency 0.8 / 10

Contract Governance 1.6 / 9

Discoverability 5.5 / 8

Regulatory Posture 2.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 26/100 · agent aware

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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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<a href="https://apis.io/providers/stamped/"><img src="https://apis.io/badge/stamped/card.svg" alt="Stamped on APIs.io — Kin Score by API Evangelist"></a>

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

8 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 0.0 — up to +20.0 composite points
Operational Transparency scores 7.9 — up to +12.0 composite points
Contract Quality scores 52.0 — up to +12.0 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/stamped/apis.yml: open an issue on github.com/api-evangelist/stamped to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Reviews, Ratings and UGC (review platforms and who integrates with them)	builds-on	22.2	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

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 5

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

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

Agent Skills 2

Packaged agent skills for driving this provider's APIs from an AI assistant.

Adjust Stamped loyalty points and redeem rewards

AGENT SKILL

Sync Stamped merchant records

AGENT SKILL

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Stamped API Rules

50 rules · 47 errors 2 warnings 1 info

SPECTRAL

OpenAPI Overlays 2

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Stamped Loyalty Operations Overlay

1 action · update · stamped-loyalty-operations-openapi.json

DERIVED

Stamped Merchant Data Overlay

1 action · update · stamped-merchant-data-openapi.json

DERIVED

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

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

X-MCPServerCandidate

X-MCPServerCandidate

AgentSkill

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

DataModel

Conformance

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 2

The organization behind the API

BlogRSS

BlogRSS

Website

Website

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

Source (apis.yml)

aid: stamped
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  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: '2026-10-06'
x-docs-platform: readme
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-17
tags:
- Company
- Consumer
- Reviews
- Ratings
- Loyalty
- E-Commerce
- Customer Marketing
- Shopify
- Loyalty & Incentives
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:
- url: https://website.stamped.io/feed/
  type: BlogRSS
- type: CapabilityMap
  url: capabilities/stamped-capability-edges.yml
  name: Stamped Business Capability Map
- 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: X-MCPServerCandidate
  url: mcp/stamped-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- 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

Stamped API — frequently asked questions

Does Stamped have an API?

Yes. APIs.io lists 5 APIs from Stamped, including Stamped Customer Actions API, Stamped Customers API and Stamped Orders API, and 2 more.

Is there an OpenAPI specification for the Stamped API?

Yes. APIs.io indexes 5 OpenAPI specifications for Stamped, each linked for download from this page.

How do I authenticate with the Stamped API?

Stamped uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Stamped Authentication.

Is the Stamped API ready for AI agents?

Stamped has a Kin Score of 34.4 out of 100 (thin) and an Agent Readiness score of 26.3 (agent-aware), scored by API Evangelist on 2026-11-06.

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