Agent Letter Desk

Agent Letter Desk provides AI-generated letters that are printed and mailed on behalf of users. The service integrates with AI models like Claude, ChatGPT, Grok, and Mistral Vibe, allowing users to compose letters via chat and have them sent via USPS Certified Mail. It offers features such as guided templates, safeguards, and destination options, targeting both US and EU markets. The platform is currently in invite-only beta, with a waitlist for broader access.

Agent Letter Desk is listed with 1 API on the APIs.io network. Tagged areas include Artificial Intelligence, Mail, Certified Mail, LetterService, and Automation.

Agent Letter Desk’s developer surface includes authentication, support, documentation, and 12 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

17.3/100 emerging ▬ flat Agent 22/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaidApproval

1 API

Artificial Intelligence Mail Certified MailLetterServiceAutomation Company

Kin Score

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

Composite quality — 17.3/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 3.2 / 17

Access Clarity 5.4 / 17

Operational Transparency 0.6 / 11

Contract Governance 0.0 / 10

Discoverability 4.9 / 9

Regulatory Posture 3.0 / 15

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

8 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 19.0 — up to +16.2 composite points
Access Clarity scores 31.6 — up to +13.7 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/agentletterdesk-com/apis.yml: open an issue on github.com/api-evangelist/agentletterdesk-com 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 →

Standards implemented 2

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.

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

APIs 1

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

Agent Letter Desk API

API documentation referenced but no machine-readable spec found.

Agent Letter Desk API pricing

Prices published by Agent Letter Desk, read 2026-11-01 from agentletterdesk.com/guides/credit-card-billing-error-lett....

Plan	Price
Standard	$17.99 for 1 page

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Agentletterdesk Com Plans Pricing

1 plans

PLANS

Security Posture 3

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

Agentletterdesk Com Authentication

1 scheme

SECURITY

Agentletterdesk Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentletterdesk Com Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Access & Security 5

Authentication, authorization, and security posture

Security

Security

Authentication

Authentication

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: agentletterdesk-com
name: Agent Letter Desk
accessModel:
  pricing: paid
  onboarding: approval
  trial: false
  try_now: false
  public: false
  label: Paid · Requires approval
  confidence: medium
  probe_state: unreadable
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://agentletterdesk.com/assets/og.1888715da0.png
description: Agent Letter Desk provides AI-generated letters that are printed and mailed on behalf of users. The service integrates
  with AI models like Claude, ChatGPT, Grok, and Mistral Vibe, allowing users to compose letters via chat and have them sent
  via USPS Certified Mail. It offers features such as guided templates, safeguards, and destination options, targeting both
  US and EU markets. The platform is currently in invite-only beta, with a waitlist for broader access.
url: https://artifacts.apis.io/agentletterdesk-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-01 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-01'
modified: '2026-11-01'
tags:
- Artificial Intelligence
- Mail
- Certified Mail
- LetterService
- Automation
- Company
tags_raw:
- AI
- Mail
- CertifiedMail
- LetterService
- Automation
- Company
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/agentletterdesk-com-plans-pricing.yml
- type: Security
  url: https://agentletterdesk.com/support#security
- type: Authentication
  url: authentication/agentletterdesk-com-authentication.yml
- type: LLMsTxt
  url: llms/agentletterdesk-com-llms.txt
- type: SecurityTxt
  url: well-known/agentletterdesk-com-security.txt
- type: WellKnown
  url: well-known/agentletterdesk-com-well-known.yml
- type: Hosts
  url: hosts/agentletterdesk-com-hosts.yml
- type: Vendors
  url: vendors/agentletterdesk-com-vendors.yml
- type: TermsOfService
  url: https://agentletterdesk.com/terms
- type: Support
  url: https://agentletterdesk.com/support
- type: PrivacyPolicy
  url: https://agentletterdesk.com/privacy
- type: Documentation
  url: https://agentletterdesk.com/guides
- type: VulnerabilityDisclosure
  url: security/agentletterdesk-com-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/agentletterdesk-com-domain-security.yml
- type: Website
  url: https://agentletterdesk.com/
apis:
- name: Agent Letter Desk API
  description: API documentation referenced but no machine-readable spec found.
  humanURL: https://agentletterdesk.com/guides
  baseURL: null
  aid: agentletterdesk-com:agent-letter-desk-api
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: No OpenAPI, AsyncAPI, GraphQL, gRPC or WSDL files were found despite probing known endpoints and documentation pages.
  evidence:
  - url: https://api.agentletterdesk.com/openapi.json
    status: error
  checked: '2026-11-01'
x-enrichment:
  date: '2026-11-01'
  status: enriched
  artifacts_added: 17
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Agent Letter Desk API — frequently asked questions

Does Agent Letter Desk have an API?

Yes. APIs.io lists 1 API from Agent Letter Desk, including Agent Letter Desk API.

How do I authenticate with the Agent Letter Desk API?

Agent Letter Desk documents its authentication (1 scheme). The details are profiled on APIs.io as Agentletterdesk Com Authentication.

How much does the Agent Letter Desk API cost?

Agent Letter Desk publishes its prices; its Standard plan is $17.99 for 1 page as of 2026-11-01. APIs.io lists 1 pricing plan for Agent Letter Desk, with each plan's price, limits and inclusions under Pricing on this page.

Is the Agent Letter Desk API ready for AI agents?

Agent Letter Desk has a Kin Score of 17.3 out of 100 (emerging) and an Agent Readiness score of 21.6 (agent-aware), scored by API Evangelist on 2026-11-06.

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