SMKlog

SMKlog (SMKLOG-2022 LLC, Berkeley Heights, New Jersey) is an independent US parcel shipping calculator and label seller: describe an item in plain words, get live USPS, UPS, FedEx and DHL Express rates from a US origin to the US, Canada, the UK, Germany or Australia, and buy the label online. The same pricing engine is published for machines as the SMKlog Quote API on quote-api.smklog.com: an OpenAPI 3.1 contract with no key required, a remote MCP server with five tools (plus an open-source stdio bridge), an A2A agent card, an RFC 9727 api-catalog, RFC 8414/9728 OAuth metadata for an optional client_credentials rate-limit tier, two provider-published Agent Skills and an llms.txt. Agents price and prepare checkout; a human always completes payment on smklog.com.

SMKlog publishes 3 API contracts indexed on the APIs.io network: Agent API, Quote API, and Status API. Tagged areas include Company, Shipping, Logistics, Parcel Shipping, and shipping-rates.

SMKlog’s developer surface includes documentation, API reference, getting-started guide, support, pricing, authentication, and 21 more developer resources.

🌐 Visit website 📡 Source on GitHub

54.7/100 strong ▬ flat Agent 42/100 agent ready Front door AI 1/6 silent Full breakdown ↓
scored 2026-10-09 · rubric v0.23.0

4 published contracts 1 MCP Servers

Company Shipping LogisticsParcel Shippingshipping-ratesShipping LabelsE-Commerce Agents MCP A2A

Kin Score

Kin Score How this is scored →
scored 2026-10-09 · rubric v0.23.0

Composite quality — 54.7/100 · strong

Contract Quality 8.2 / 19

Developer Ergonomics 7.9 / 15

Access Clarity 9.5 / 15

Operational Transparency 5.1 / 10

Contract Governance 1.6 / 9

Discoverability 6.0 / 8

Regulatory Posture 6.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 42/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

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/.

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/smklog-com: 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 3

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

SMKlog Agent API

The Agent API from SMKlog — 2 operation(s) for agent.

SMKlog Quote API

The Quote API from SMKlog — 1 operation(s) for quote.

SMKlog Status API

The Status API from SMKlog — 1 operation(s) for status.

MCP Servers 1

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

SMKlog MCP Server

Remote MCP server at quote-api.smklog.com over HTTP; 5 tools listed.

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Smklog Com Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Smklog Com Rate Limits

2 limits

RATE LIMITS

OpenAPI Overlays 1

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.

Smklog Com Quote Api Overlay

6 actions · documentation · smklog-com-openapi.yml

GENERATED

Security Posture 3

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

Smklog Com Authentication

none/oauth2 · 2 schemes

SECURITY

Smklog Com Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Smklog Com Vulnerability Disclosure

security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Smklog Com Scopes

1 scope · clientCredentials

1 scopes

SCOPES

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

AgentSkill

WellKnown

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

Access & Security 6

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

SecurityTxt

Security

Authentication

OAuthScopes

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

BlogRSS

BlogRSS

Website

Website

Other 3

Properties that don't map to a standard resource type

Overlay

Overlay

AgentCard

AgentCard

DataSubjectRequest

DataSubjectRequest

Source (apis.yml)

aid: smklog-com
name: SMKlog
description: 'SMKlog (SMKLOG-2022 LLC, Berkeley Heights, New Jersey) is an independent US parcel shipping calculator and label
  seller: describe an item in plain words, get live USPS, UPS, FedEx and DHL Express rates from a US origin to the US, Canada,
  the UK, Germany or Australia, and buy the label online. The same pricing engine is published for machines as the SMKlog
  Quote API on quote-api.smklog.com: an OpenAPI 3.1 contract with no key required, a remote MCP server with five tools (plus
  an open-source stdio bridge), an A2A agent card, an RFC 9727 api-catalog, RFC 8414/9728 OAuth metadata for an optional client_credentials
  rate-limit tier, two provider-published Agent Skills and an llms.txt. Agents price and prepare checkout; a human always
  completes payment on smklog.com.'
image: https://smklog.com/assets/icon-512.png
url: https://raw.githubusercontent.com/api-evangelist/smklog-com/refs/heads/main/apis.yml
x-type: company
x-source: harvest:a2a-registry
x-tier: profiled
x-tier-reason: full-pipeline enrichment 2026-09-19 from the live smklog.com and quote-api.smklog.com surface
specificationVersion: '0.20'
created: '2026-09-19'
modified: '2026-10-08'
tags:
- Company
- Shipping
- Logistics
- Parcel Shipping
- shipping-rates
- Shipping Labels
- E-Commerce
- Agents
- MCP
- A2A
tags_raw:
- Company
- Shipping
- Logistics
- Parcel Shipping
- Shipping Rates
- Shipping Labels
- Ecommerce
- Agents
- MCP
- A2A
apis:
- aid: smklog-com:smklog-com-agent-api
  name: SMKlog Agent API
  description: The Agent API from SMKlog — 2 operation(s) for agent.
  humanURL: https://smklog.com/api
  baseURL: https://quote-api.smklog.com
  tags:
  - Agents
  tags_raw:
  - Agent
  properties:
  - type: OpenAPI
    url: openapi/smklog-com-agent-api-openapi.yml
  - type: Documentation
    url: https://smklog.com/api
  - type: APIReference
    url: https://quote-api.smklog.com/openapi.json
  - type: GettingStarted
    url: https://smklog.com/repack-line
  - type: ToolCrosswalk
    url: mcp/smklog-com-tool-crosswalk.yml
  - type: Authentication
    url: authentication/smklog-com-authentication.yml
  - type: OAuthScopes
    url: scopes/smklog-com-scopes.yml
  - type: Conventions
    url: conventions/smklog-com-conventions.yml
  - type: ErrorCatalog
    url: errors/smklog-com-problem-types.yml
  - type: Lifecycle
    url: lifecycle/smklog-com-lifecycle.yml
  - type: Conformance
    url: conformance/smklog-com-conformance.yml
  - type: RateLimits
    url: rate-limits/smklog-com-rate-limits.yml
  - type: Plans
    url: plans/smklog-com-plans-pricing.yml
  - type: DataModel
    url: data-model/smklog-com-data-model.yml
  - type: ChangeLog
    url: changelog/smklog-com-changelog.yml
- aid: smklog-com:smklog-com-quote-api
  name: SMKlog Quote API
  description: The Quote API from SMKlog — 1 operation(s) for quote.
  humanURL: https://smklog.com/api
  baseURL: https://quote-api.smklog.com
  tags:
  - Quotes
  tags_raw:
  - Quote
  properties:
  - type: OpenAPI
    url: openapi/smklog-com-quote-api-openapi.yml
  - type: Documentation
    url: https://smklog.com/api
  - type: APIReference
    url: https://quote-api.smklog.com/openapi.json
  - type: GettingStarted
    url: https://smklog.com/repack-line
  - type: ToolCrosswalk
    url: mcp/smklog-com-tool-crosswalk.yml
  - type: Authentication
    url: authentication/smklog-com-authentication.yml
  - type: OAuthScopes
    url: scopes/smklog-com-scopes.yml
  - type: Conventions
    url: conventions/smklog-com-conventions.yml
  - type: ErrorCatalog
    url: errors/smklog-com-problem-types.yml
  - type: Lifecycle
    url: lifecycle/smklog-com-lifecycle.yml
  - type: Conformance
    url: conformance/smklog-com-conformance.yml
  - type: RateLimits
    url: rate-limits/smklog-com-rate-limits.yml
  - type: Plans
    url: plans/smklog-com-plans-pricing.yml
  - type: DataModel
    url: data-model/smklog-com-data-model.yml
  - type: ChangeLog
    url: changelog/smklog-com-changelog.yml
- aid: smklog-com:smklog-com-status-api
  name: SMKlog Status API
  description: The Status API from SMKlog — 1 operation(s) for status.
  humanURL: https://smklog.com/api
  baseURL: https://quote-api.smklog.com
  tags:
  - Status
  properties:
  - type: OpenAPI
    url: openapi/smklog-com-status-api-openapi.yml
  - type: Documentation
    url: https://smklog.com/api
  - type: APIReference
    url: https://quote-api.smklog.com/openapi.json
  - type: GettingStarted
    url: https://smklog.com/repack-line
  - type: ToolCrosswalk
    url: mcp/smklog-com-tool-crosswalk.yml
  - type: Authentication
    url: authentication/smklog-com-authentication.yml
  - type: OAuthScopes
    url: scopes/smklog-com-scopes.yml
  - type: Conventions
    url: conventions/smklog-com-conventions.yml
  - type: ErrorCatalog
    url: errors/smklog-com-problem-types.yml
  - type: Lifecycle
    url: lifecycle/smklog-com-lifecycle.yml
  - type: Conformance
    url: conformance/smklog-com-conformance.yml
  - type: RateLimits
    url: rate-limits/smklog-com-rate-limits.yml
  - type: Plans
    url: plans/smklog-com-plans-pricing.yml
  - type: DataModel
    url: data-model/smklog-com-data-model.yml
  - type: ChangeLog
    url: changelog/smklog-com-changelog.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/smklog-com-plans-pricing.yml
- type: RateLimits
  url: rate-limits/smklog-com-rate-limits.yml
- url: https://smklog.com/feed.xml
  type: BlogRSS
- type: Overlay
  url: overlays/smklog-com-quote-api-overlay.yaml
- type: VulnerabilityDisclosure
  url: security/smklog-com-vulnerability-disclosure.yml
- type: Website
  url: https://smklog.com/
- type: Documentation
  url: https://smklog.com/api
- type: APIReference
  url: https://quote-api.smklog.com/openapi.json
- type: GettingStarted
  url: https://smklog.com/repack-line
- type: Support
  url: https://smklog.com/support
- type: Pricing
  url: https://smklog.com/pricing
- type: TermsOfService
  url: https://smklog.com/terms
- type: PrivacyPolicy
  url: https://smklog.com/privacy
- type: GitHubOrganization
  url: https://github.com/smklog
- type: LLMsTxt
  url: llms/smklog-com-llms.txt
- type: LLMsTxt
  name: Provider-hosted llms.txt
  url: https://smklog.com/llms.txt
- type: AgentCard
  url: a2a/smklog-com-a2a.yml
- type: MCPServer
  url: mcp/smklog-com-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: WellKnown
  url: well-known/smklog-com-well-known.yml
- type: SecurityTxt
  url: well-known/smklog-com-security.txt
- type: Security
  url: https://smklog.com/.well-known/security.txt
- type: Packages
  url: packages/smklog-com-packages.yml
- type: Authentication
  url: authentication/smklog-com-authentication.yml
- type: OAuthScopes
  url: scopes/smklog-com-scopes.yml
- type: DomainSecurity
  url: security/smklog-com-domain-security.yml
- type: DataSubjectRequest
  url: https://smklog.com/privacy
x-enrichment:
  date: '2026-09-19'
  status: enriched
  artifacts_added: 38
  pass: local-v3
x-a2a:
  verified: true
  probed: '2026-10-08'
  url: https://smklog.com/.well-known/agent-card.json
  grade: conformant
  protocol_version: '1.0'
  control: 404
x-correction-request:
  requested: '2026-10-07'
  source:
  - _messages/2026-10/2026-10-07-fastmail-38773-a2a-card-check-on-apisioa2asmklog-com-applies-v03.md
  request: 'Dmitrii Timin (ceo@smklog.com), 2026-10-07: https://apis.io/a2a/smklog-com shows "Agent card, not A2A" with no-protocolVersion,
    no-top-level-url and supportedInterfaces-instead-of-preferredTransport-and-url -- 0.3 rules applied to an A2A 1.0 card
    (spec 4.4.1, 4.4.6: no top-level url/preferredTransport/protocolVersion; supportedInterfaces[] carries url, protocolBinding,
    protocolVersion). The page is built from a 2026-09-19 copy; the live card has three skills, declares 1.0 and is JWS-signed.
    Re-capture and fix the check.'
  applied: '2026-10-08'
  applied_note: 'Verified live 2026-10-08: card 200 application/json on smklog.com (same JSON on quote-api.smklog.com), version
    1.4.0, supportedInterfaces[0] {url https://quote-api.smklog.com/a2a, protocolBinding JSONRPC, protocolVersion 1.0}, 3
    skills, ES256 JWS signature verifies against https://smklog.com/.well-known/jwks.json (kid smklog-a2a-2026-09) over the
    JCS-canonical card; the endpoint answers both tasks/get (0.3) and GetTask (1.0) with a JSON-RPC -32001. Re-captured the
    card verbatim and rewrote a2a/smklog-com-a2a.yml: lib_agent_card.grade_agent_card (fixed for the 1.0 layout in network
    9ab6c0cb4, roadmap#611) grades it conformant with no deviations; the three hand-recorded deviations were 0.3 rules and
    are removed. The /a2a/ page changes only when build_a2a.py is next run.'

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