Handwrite IO

Handwrite is a South Carolina based direct-mail service that writes and mails real handwritten cards on demand, and exposes that fulfillment as a small REST API at https://api.handwrite.io/v1. Four operations cover the whole surface: list the handwriting styles on the account, list the stationery and card options, send a card to between one and ten US recipients (or up to 1,000 orders in a single batch request), and fetch an order to follow it from processing through written to complete and retrieve proof images of the finished card and envelope. Authentication is a single static API key sent raw in the Authorization header, prefixed test_hw for unbilled test-mode calls or live_hw for calls that actually mail and bill. Pricing is per mailed card rather than per API call, from $2.99 down to $2.45 by volume, with the card, envelope, handwriting and postage included. The API is rate limited to 60 requests per minute per key. Handwrite also ships a Zapier integration for teams that do not want to write code.

Handwrite IO publishes 4 APIs on the APIs.io network, including Handwriting API, Orders API, Send API, and 1 more. Tagged areas include Direct Mail, Handwritten, Handwritten Notes, Cards, and Marketing.

The Handwrite IO catalog on APIs.io includes 1 Spectral governance ruleset.

Handwrite IO’s developer surface includes authentication, sandbox, documentation, API reference, getting-started guide, support, engineering blog, and 21 more developer resources.

🌐 Visit website 📡 Source on GitHub

49.3/100 developing ▬ flat Agent 24/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessPaid

1 APIs

Direct MailHandwrittenHandwritten NotesCards Marketing Notes Print Fulfillment Customer Engagement

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 49.3/100 · developing

Contract Quality 10.5 / 19

Developer Ergonomics 7.8 / 15

Access Clarity 9.5 / 15

Operational Transparency 2.3 / 10

Contract Governance 3.0 / 9

Discoverability 5.1 / 8

Regulatory Posture 4.0 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 24/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 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 7 / 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

Regulatory Posture applies to this provider. Its tags matched the Payments 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/handwrite-io: 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 4

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

Handwrite IO Handwriting API

Available handwriting styles

Handwrite IO Orders API

Order tracking and status

Handwrite IO Send API

Send handwritten notes

Handwrite IO Stationery API

Available stationery and cards

Open Collections 6

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

API Collection

OPEN COLLECTION

Handwrite IO Handwriting API

OPEN COLLECTION

Handwrite IO Handwriting Orders API

OPEN COLLECTION

Handwrite IO Handwriting Send API

OPEN COLLECTION

Handwrite IO Handwriting Stationery API

OPEN COLLECTION

Handwrite IO API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Handwrite Io Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Handwrite Io Rate Limits

1 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Handwrite Io Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Handwrite IO API Rules

0 rules ·

SPECTRAL

Security Posture 2

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

Handwrite Io Authentication

apiKey · 1 scheme

SECURITY

Handwrite Io Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Handwrite Io Agentic Access

4 operations · 1 acting

AGENTIC

Resources

Get Started 5

Portal, sign-up, and the first successful call

Sandbox

DeveloperPortal

GettingStarted

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

AgentSkill

AgentSkill

LLMsTxt

LLMsTxt

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

DataModel

Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

HelpCenter

HelpCenter

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Pricing

Pricing

Company 3

The organization behind the API

Blog

Blog

LinkedIn

Website

Website

Source (apis.yml)

aid: handwrite-io
name: Handwrite IO
description: 'Handwrite is a South Carolina based direct-mail service that writes and mails real handwritten cards on demand,
  and exposes that fulfillment as a small REST API at https://api.handwrite.io/v1. Four operations cover the whole surface:
  list the handwriting styles on the account, list the stationery and card options, send a card to between one and ten US
  recipients (or up to 1,000 orders in a single batch request), and fetch an order to follow it from processing through written
  to complete and retrieve proof images of the finished card and envelope. Authentication is a single static API key sent
  raw in the Authorization header, prefixed test_hw for unbilled test-mode calls or live_hw for calls that actually mail and
  bill. Pricing is per mailed card rather than per API call, from $2.99 down to $2.45 by volume, with the card, envelope,
  handwriting and postage included. The API is rate limited to 60 requests per minute per key. Handwrite also ships a Zapier
  integration for teams that do not want to write code.'
url: https://raw.githubusercontent.com/api-evangelist/handwrite-io/refs/heads/main/apis.yml
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  - sandbox
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/handwrite-io.png
tags:
- Direct Mail
- Handwritten
- Handwritten Notes
- Cards
- Marketing
- Notes
- Print
- Fulfillment
- Customer Engagement
created: '2024-11-14'
modified: '2026-08-13'
specificationVersion: '0.23'
apis:
- aid: handwrite-io:handwrite-io-handwriting-api
  name: Handwrite IO Handwriting API
  description: Available handwriting styles
  humanURL: https://documentation.handwrite.io/#get-handwritings
  baseURL: https://api.handwrite.io/v1
  tags:
  - Handwriting
  properties:
  - type: OpenAPI
    url: openapi/handwrite-io-handwriting-api-openapi.yml
  - type: Overlay
    url: overlays/handwrite-io-handwriting-api-overlay.yaml
  - type: PostmanCollection
    url: collections/handwrite-io-handwriting-api.postman_collection.json
  - type: OpenCollection
    url: collections/handwrite-io-handwriting-api.opencollection.json
  - type: Documentation
    url: https://documentation.handwrite.io/#introduction
  - type: Authentication
    url: https://documentation.handwrite.io/#getting-started
  - type: Rules
    url: https://raw.githubusercontent.com/api-evangelist/handwrite-io/refs/heads/main/rules/handwrite-io-rules.yml
- aid: handwrite-io:handwrite-io-orders-api
  name: Handwrite IO Orders API
  description: Order tracking and status
  humanURL: https://documentation.handwrite.io/#get-an-order
  baseURL: https://api.handwrite.io/v1
  tags:
  - Order
  tags_raw:
  - Orders
  properties:
  - type: OpenAPI
    url: openapi/handwrite-io-orders-api-openapi.yml
  - type: Overlay
    url: overlays/handwrite-io-orders-api-overlay.yaml
  - type: PostmanCollection
    url: collections/handwrite-io-orders-api.postman_collection.json
  - type: OpenCollection
    url: collections/handwrite-io-orders-api.opencollection.json
  - type: Documentation
    url: https://documentation.handwrite.io/#introduction
  - type: Authentication
    url: https://documentation.handwrite.io/#getting-started
  - type: Rules
    url: https://raw.githubusercontent.com/api-evangelist/handwrite-io/refs/heads/main/rules/handwrite-io-rules.yml
- aid: handwrite-io:handwrite-io-send-api
  name: Handwrite IO Send API
  description: Send handwritten notes
  humanURL: https://documentation.handwrite.io/#send-a-letter
  baseURL: https://api.handwrite.io/v1
  tags:
  - Send
  properties:
  - type: OpenAPI
    url: openapi/handwrite-io-send-api-openapi.yml
  - type: Overlay
    url: overlays/handwrite-io-send-api-overlay.yaml
  - type: PostmanCollection
    url: collections/handwrite-io-send-api.postman_collection.json
  - type: OpenCollection
    url: collections/handwrite-io-send-api.opencollection.json
  - type: Documentation
    url: https://documentation.handwrite.io/#introduction
  - type: Authentication
    url: https://documentation.handwrite.io/#getting-started
  - type: Rules
    url: https://raw.githubusercontent.com/api-evangelist/handwrite-io/refs/heads/main/rules/handwrite-io-rules.yml
- aid: handwrite-io:handwrite-io-stationery-api
  name: Handwrite IO Stationery API
  description: Available stationery and cards
  humanURL: https://documentation.handwrite.io/#get-stationery
  baseURL: https://api.handwrite.io/v1
  tags:
  - Stationery
  properties:
  - type: OpenAPI
    url: openapi/handwrite-io-stationery-api-openapi.yml
  - type: Overlay
    url: overlays/handwrite-io-stationery-api-overlay.yaml
  - type: PostmanCollection
    url: collections/handwrite-io-stationery-api.postman_collection.json
  - type: OpenCollection
    url: collections/handwrite-io-stationery-api.opencollection.json
  - type: Documentation
    url: https://documentation.handwrite.io/#introduction
  - type: Authentication
    url: https://documentation.handwrite.io/#getting-started
  - type: Rules
    url: https://raw.githubusercontent.com/api-evangelist/handwrite-io/refs/heads/main/rules/handwrite-io-rules.yml
common:
- type: AgenticAccess
  url: agentic-access/handwrite-io-agentic-access.yml
- type: DomainSecurity
  url: security/handwrite-io-domain-security.yml
- type: Authentication
  url: authentication/handwrite-io-authentication.yml
- type: Conventions
  url: conventions/handwrite-io-conventions.yml
- type: ErrorCatalog
  url: errors/handwrite-io-problem-types.yml
- type: RateLimits
  url: rate-limits/handwrite-io-rate-limits.yml
- type: Plans
  url: plans/handwrite-io-plans-pricing.yml
- type: FinOps
  url: finops/handwrite-io-finops.yml
- type: Lifecycle
  url: lifecycle/handwrite-io-lifecycle.yml
- type: Sandbox
  url: sandbox/handwrite-io-sandbox.yml
- type: DataModel
  url: data-model/handwrite-io-data-model.yml
- type: Conformance
  url: conformance/handwrite-io-conformance.yml
- type: Packages
  url: packages/handwrite-io-packages.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/handwrite-io-llms.txt
- type: DeveloperPortal
  url: https://documentation.handwrite.io/
- type: Documentation
  url: https://documentation.handwrite.io/
- type: APIReference
  url: https://documentation.handwrite.io/#endpoints
- type: GettingStarted
  url: https://documentation.handwrite.io/#getting-started
- type: GitHubOrganization
  url: https://github.com/handwriteio
- type: Support
  url: https://www.handwrite.io/contact-us
- type: HelpCenter
  url: https://www.handwrite.io/faq
- type: Blog
  url: https://www.handwrite.io/blog
- type: Pricing
  url: https://www.handwrite.io/pricing
- type: SignUp
  url: https://app.handwrite.io/signup
- type: Login
  url: https://app.handwrite.io/login
- type: LinkedIn
  url: https://www.linkedin.com/company/handwrite
- type: Website
  url: https://handwrite.io/
- type: Integrations
  url: https://www.handwrite.io/integrations
integrations:
- name: Handwrite
- name: Zapier
  url: https://zapier.com/apps/handwrite/integrations
  description: Handwrite's own integrations page positions Zapier as the no-code path — "trigger a personalized handwritten
    card from more than 3,000 apps" including Shopify, Salesforce and Magento.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 19
  pass: local-v1
x-pointers-deliberately-withheld:
  note: Artifacts exist in this repo for these, but no apis.yml pointer is wired, because the pointer would assert that HANDWRITE
    publishes the surface. Each was probed on 2026-08-13.
  withheld:
  - type: WellKnown
    artifact: well-known/handwrite-io-well-known.yml
    reason: every /.well-known/ path returned 404 on all four Handwrite hosts
  - type: SecurityTxt
    artifact: well-known/handwrite-io-well-known.yml
    reason: /.well-known/security.txt returned 404 on all four hosts
  - type: MCPServer
    artifact: mcp/handwrite-io-mcp.yml
    reason: no server exists; the file is an API Evangelist candidate tool list derived from the OpenAPI (deployment.mode
      = none), and mcp.handwrite.io is NXDOMAIN
  - type: AgentCard
    artifact: none
    reason: /.well-known/agent-card.json and /.well-known/agent.json returned 404 on all four hosts; per pipeline rule no
      stub was authored
  - type: ChangeLog
    artifact: changelog/handwrite-io-changelog.yml
    reason: Handwrite publishes no changelog; the artifact reconstructs history from their own API-Docs commit log and records
      the absence
  - type: StatusPage
    artifact: lifecycle/handwrite-io-lifecycle.yml
    reason: status.handwrite.io is NXDOMAIN and handwrite.statuspage.io 200s only because it redirects to Atlassian marketing
      — a soft-200, not a status page
  - type: Deprecation
    artifact: lifecycle/handwrite-io-lifecycle.yml
    reason: no deprecation or sunset policy published; no RFC 8594 headers observed
  - type: Idempotency
    artifact: conventions/handwrite-io-conventions.yml
    reason: no idempotency key is supported, which is a material hazard on POST /send rather than a scoring nicety
  - type: SDKs
    artifact: packages/handwrite-io-packages.yml
    reason: zero first-party client libraries in any registry; the only installable client is a community Elixir package last
      released 2020-11-14
  - type: Compliance
    artifact: conformance/handwrite-io-conformance.yml
    reason: no certifications, trust center, terms of service or privacy policy published
  - type: Security
    artifact: none
    reason: probe-security-programs.py found no vulnerability disclosure program and no trust center
  - type: Webhooks
    artifact: none
    reason: no webhook, callback or event surface exists; order status is polling-only
  - type: TermsOfService / PrivacyPolicy
    artifact: none
    reason: /terms, /terms-of-service, /privacy, /privacy-policy, /legal all 404 on www.handwrite.io and app.handwrite.io;
      the site sitemap lists 15 URLs and contains no legal page

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