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 API contracts indexed 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 📡 Profile data on GitHub

46.5/100 developing ▬ flat Agent 23/100 agent aware Front door AI 1/6 silent Heartbeat 0/100 dormant saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaid

1 published contract 3 Agent Skills

Direct MailHandwrittenHandwritten NotesCards Marketing Notes Print Fulfillment Customer Engagement

Kin Score

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

Composite quality — 46.5/100 · developing

Contract Quality 9.4 / 19

Developer Ergonomics 7.8 / 15

Access Clarity 9.5 / 15

Operational Transparency 2.3 / 10

Contract Governance 2.0 / 9

Discoverability 5.0 / 8

Regulatory Posture 2.3 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 23/100 · 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

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

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

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

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
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
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

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 50.2 — up to +12.5 composite points
Operational Transparency scores 23.7 — up to +9.9 composite points
Developer Ergonomics scores 51.8 — up to +9.6 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/handwrite-io/apis.yml: open an issue on github.com/api-evangelist/handwrite-io 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 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 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 5

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

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

Agent Skills 3

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

handwrite-io-browse-options

AGENT SKILL

handwrite-io-send-handwritten-card

AGENT SKILL

handwrite-io-track-order

AGENT SKILL

Handwrite IO API pricing

Prices published by Handwrite IO, read 2026-10-28 from www.handwrite.io/pricing.

Plan	Price
1 - 99 cards	$2.99 per card Includes: the card, envelope, writing, and postage
100 - 249 cards	$2.75 per card Includes: the card, envelope, writing, and postage
250 - 499 cards	$2.60 per card Includes: the card, envelope, writing, and postage
500 - 999 cards	$2.45 per card Includes: the card, envelope, writing, and postage
1000 +	Contact Us per card

Plan details, limits and sources →

Rate limits

Default API key limit: 60 requests per minute

Rate-limit details →

Billed by: card · FinOps profile →

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

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Handwrite IO

SLA

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

OpenAPI Overlays 4

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.

Handwrite Io Handwriting Api Overlay

4 actions · documentation · handwrite-io-handwriting-api-openapi.yml

DERIVED

Handwrite Io Orders Api Overlay

5 actions · documentation · handwrite-io-orders-api-openapi.yml

DERIVED

Handwrite Io Send Api Overlay

5 actions · documentation · handwrite-io-send-api-openapi.yml

DERIVED

Handwrite Io Stationery Api Overlay

4 actions · documentation · handwrite-io-stationery-api-openapi.yml

DERIVED

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: '2026-11-06'
  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

Handwrite IO API — frequently asked questions

Does Handwrite IO have an API?

Yes. APIs.io lists 4 APIs from Handwrite IO, including Handwrite IO Handwriting API, Handwrite IO Orders API and Handwrite IO Send API, and 1 more.

Is there an OpenAPI specification for the Handwrite IO API?

Yes. APIs.io indexes 4 OpenAPI specifications for Handwrite IO, each linked for download from this page.

How do I authenticate with the Handwrite IO API?

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

How much does the Handwrite IO API cost?

Handwrite IO publishes its prices; its 1 - 99 cards plan is $2.99 per card as of 2026-10-28. APIs.io lists 5 pricing plans for Handwrite IO, with each plan's price, limits and inclusions under Pricing on this page.

Is the Handwrite IO API ready for AI agents?

Handwrite IO has a Kin Score of 46.5 out of 100 (developing) and an Agent Readiness score of 22.7 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/handwrite-io"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/handwrite-io/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/handwrite-io/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.