print-one

Print.one provides a Postcards API that enables businesses to send real, personalized postcards worldwide via a simple HTTP API. Users can upload address lists, customize designs, choose finishes, and schedule deliveries. The service offers pay‑as‑you‑go pricing with no minimum spend, supports batch orders, and integrates with popular tools like Zapier. It aims to boost direct‑mail marketing effectiveness with fast turnaround and high engagement.

print-one publishes 10 API contracts indexed on the APIs.io network, including Address API, Campaigns API, Coupons API, and 7 more. Tagged areas include Postcards, API, Direct Mail, Marketing, and Automation.

The print-one catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 1 Spectral governance ruleset.

print-one’s developer surface includes support, documentation, authentication, API reference, getting-started guide, engineering blog, pricing, and 23 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

58.9/100 strong Agent 49/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 1 Agent Skills

PostcardsAPIDirect Mail Marketing Automation

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 58.9/100 · strong

Contract Quality 14.5 / 21

Developer Ergonomics 12.0 / 17

Access Clarity 5.8 / 17

Operational Transparency 2.0 / 11

Contract Governance 8.1 / 10

Discoverability 5.6 / 9

Regulatory Posture 4.6 / 15

Agent readiness — 49/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 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 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 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 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

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

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

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

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
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's
Protected Resource Metadata +5 pts — a served /.well-known/oauth-protected-resource carrying `resource` (documented), and naming its authorization_servers (verified)

2 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 34.2 — up to +13.2 composite points
Operational Transparency scores 18.4 — up to +10.6 composite points
Contract Quality scores 68.4 — up to +7.9 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/print-one/apis.yml: open an issue on github.com/api-evangelist/print-one 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 →

APIs 10

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

print-one Address API

The Address API from print-one — 2 operation(s) for address.

print-one Campaigns API

The Campaigns API from print-one — 4 operation(s) for campaigns.

print-one Coupons API

The Coupons API from print-one — 3 operation(s) for coupons.

print-one Design Previews API

The Design Previews API from print-one — 4 operation(s) for design previews.

print-one Designs API

The Designs API from print-one — 3 operation(s) for designs.

print-one Imports API

The Imports API from print-one — 8 operation(s) for imports.

print-one Items API

The Items API from print-one — 5 operation(s) for items.

print-one Mailings API

The Mailings API from print-one — 5 operation(s) for mailings.

print-one Webhooks API

Webhooks report system updates to your own systems.

print-one Webhook Events API

You can find more information about webhooks in our help center. Below you can find a list of supported webhook events: order_status_update template_preview_rendered coupon_code...

Scroll for all 10

Agent Skills 1

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

get-campaigns

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Print One Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Print One Rate Limits

0 limits

RATE LIMITS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Print One Webhooks

ASYNCAPI

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Print One Context

120 classes · 182 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

print-one API Rules

14 rules · 10 errors 3 warnings 1 info

SPECTRAL

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.

Print One Openapi Overlay

0 actions · update

UNRECORDED

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

AddCampaignItemResponseDto

29 properties

JSON SCHEMA

CampaignImportDetailsResponseDto

18 properties

JSON SCHEMA

GenericDesignV3Dto

13 properties

JSON SCHEMA

GetCampaignResponseDto

16 properties

JSON SCHEMA

MailingResponseDto

13 properties

JSON SCHEMA

SimpleCampaignImportDetailsResponseDto

13 properties

JSON SCHEMA

Security Posture 2

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

Print One Authentication

apiKey/oauth2 · 2 schemes

SECURITY

Print One Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Print One Scopes

30 scopes · authorizationCode

30 scopes

SCOPES

Agentic Access 1

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

Print One Agentic Access

49 operations · 25 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

WellKnown

Design & Contract 8

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Webhooks

DataModel

ErrorCatalog

Conformance

Webhooks

Scroll for all 8

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

Access & Security 5

Authentication, authorization, and security posture

SecurityTxt

SecurityTxt

OAuthScopes

Authentication

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

Pricing

Pricing

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Hosts

Hosts

Source (apis.yml)

aid: print-one
name: print-one
description: Print.one provides a Postcards API that enables businesses to send real, personalized postcards worldwide via
  a simple HTTP API. Users can upload address lists, customize designs, choose finishes, and schedule deliveries. The service
  offers pay‑as‑you‑go pricing with no minimum spend, supports batch orders, and integrates with popular tools like Zapier.
  It aims to boost direct‑mail marketing effectiveness with fast turnaround and high engagement.
image: https://print.one/favicon.ico?84548c17643e802c
url: https://artifacts.apis.io/print-one/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-31 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-31'
modified: '2026-10-31'
tags:
- Postcards
- API
- Direct Mail
- Marketing
- Automation
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/print-one-agentic-access.yml
- type: Spectral
  url: rules/print-one-rules.yml
- type: JSONLD
  url: json-ld/print-one-context.jsonld
- type: Vocabulary
  url: vocabulary/print-one-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Webhooks
  url: asyncapi/print-one-webhooks.yml
- type: DataModel
  url: data-model/print-one-data-model.yml
- type: ErrorCatalog
  url: errors/print-one-problem-types.yml
- type: Conformance
  url: conformance/print-one-conformance.yml
- type: LLMsTxt
  url: llms/print-one-llms.txt
- type: SecurityTxt
  url: well-known/print-one-printone-security.txt
- type: SecurityTxt
  url: well-known/print-one-api-security.txt
- type: WellKnown
  url: well-known/print-one-well-known.yml
- type: Hosts
  url: hosts/print-one-hosts.yml
- type: SDKs
  url: packages/print-one-packages.yml
- type: Packages
  url: packages/print-one-packages.yml
- type: Webhooks
  url: https://help.print.one/api/webhooks
- type: TermsOfService
  url: https://print.one/terms-and-conditions
- type: Support
  url: https://support.print.one
- type: Documentation
  url: https://docs.print.one/
- type: OAuthScopes
  url: scopes/print-one-scopes.yml
- type: Authentication
  url: authentication/print-one-authentication.yml
- type: DomainSecurity
  url: security/print-one-domain-security.yml
- type: Website
  url: https://print.one/
- type: DeveloperPortal
  url: https://portal.print.one
- type: APIReference
  url: https://portal.print.one
- type: GettingStarted
  url: https://print.one/pricing/
- type: Blog
  url: https://print.one/blog/
- type: Pricing
  url: https://print.one/pricing/
- type: SignUp
  url: https://print.one/register/
apis:
- aid: print-one:print-one-address-api
  name: print-one Address API
  description: The Address API from print-one — 2 operation(s) for address.
  humanURL: https://docs.print.one/v3
  baseURL: https://api.print.one
  tags:
  - Address
  properties:
  - type: OpenAPI
    url: openapi/print-one-address-api-openapi.yml
  - type: JSONSchema
    url: json-schema/print-one-add-campaign-item-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-campaign-import-details-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-get-campaign-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-generic-design-v3-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-mailing-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-simple-campaign-import-details-response-dto-schema.json
- aid: print-one:print-one-campaigns-api
  name: print-one Campaigns API
  description: The Campaigns API from print-one — 4 operation(s) for campaigns.
  humanURL: https://docs.print.one/v3
  baseURL: https://api.print.one
  tags:
  - Campaigns
  properties:
  - type: OpenAPI
    url: openapi/print-one-campaigns-api-openapi.yml
  - type: JSONSchema
    url: json-schema/print-one-add-campaign-item-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-campaign-import-details-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-get-campaign-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-generic-design-v3-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-mailing-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-simple-campaign-import-details-response-dto-schema.json
- aid: print-one:print-one-coupons-api
  name: print-one Coupons API
  description: The Coupons API from print-one — 3 operation(s) for coupons.
  humanURL: https://docs.print.one/v3
  baseURL: https://api.print.one
  tags:
  - Coupons
  properties:
  - type: OpenAPI
    url: openapi/print-one-coupons-api-openapi.yml
  - type: JSONSchema
    url: json-schema/print-one-add-campaign-item-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-campaign-import-details-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-get-campaign-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-generic-design-v3-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-mailing-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-simple-campaign-import-details-response-dto-schema.json
- aid: print-one:print-one-design-previews-api
  name: print-one Design Previews API
  description: The Design Previews API from print-one — 4 operation(s) for design previews.
  humanURL: https://docs.print.one/v3
  baseURL: https://api.print.one
  tags:
  - Design Previews
  properties:
  - type: OpenAPI
    url: openapi/print-one-design-previews-api-openapi.yml
  - type: JSONSchema
    url: json-schema/print-one-add-campaign-item-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-campaign-import-details-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-get-campaign-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-generic-design-v3-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-mailing-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-simple-campaign-import-details-response-dto-schema.json
- aid: print-one:print-one-designs-api
  name: print-one Designs API
  description: The Designs API from print-one — 3 operation(s) for designs.
  humanURL: https://docs.print.one/v3
  baseURL: https://api.print.one
  tags:
  - Designs
  properties:
  - type: OpenAPI
    url: openapi/print-one-designs-api-openapi.yml
  - type: JSONSchema
    url: json-schema/print-one-add-campaign-item-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-campaign-import-details-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-get-campaign-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-generic-design-v3-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-mailing-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-simple-campaign-import-details-response-dto-schema.json
- aid: print-one:print-one-imports-api
  name: print-one Imports API
  description: The Imports API from print-one — 8 operation(s) for imports.
  humanURL: https://docs.print.one/v3
  baseURL: https://api.print.one
  tags:
  - Imports
  properties:
  - type: OpenAPI
    url: openapi/print-one-imports-api-openapi.yml
  - type: JSONSchema
    url: json-schema/print-one-add-campaign-item-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-campaign-import-details-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-get-campaign-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-generic-design-v3-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-mailing-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-simple-campaign-import-details-response-dto-schema.json
- aid: print-one:print-one-items-api
  name: print-one Items API
  description: The Items API from print-one — 5 operation(s) for items.
  humanURL: https://docs.print.one/v3
  baseURL: https://api.print.one
  tags:
  - Items
  properties:
  - type: OpenAPI
    url: openapi/print-one-items-api-openapi.yml
  - type: JSONSchema
    url: json-schema/print-one-add-campaign-item-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-campaign-import-details-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-get-campaign-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-generic-design-v3-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-mailing-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-simple-campaign-import-details-response-dto-schema.json
- aid: print-one:print-one-mailings-api
  name: print-one Mailings API
  description: The Mailings API from print-one — 5 operation(s) for mailings.
  humanURL: https://docs.print.one/v3
  baseURL: https://api.print.one
  tags:
  - Mailings
  properties:
  - type: OpenAPI
    url: openapi/print-one-mailings-api-openapi.yml
  - type: JSONSchema
    url: json-schema/print-one-add-campaign-item-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-campaign-import-details-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-get-campaign-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-generic-design-v3-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-mailing-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-simple-campaign-import-details-response-dto-schema.json
- aid: print-one:print-one-webhooks-api
  name: print-one Webhooks API
  description: Webhooks report system updates to your own systems.
  humanURL: https://docs.print.one/v3
  baseURL: https://api.print.one
  tags:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/print-one-webhooks-api-openapi.yml
  - type: JSONSchema
    url: json-schema/print-one-add-campaign-item-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-campaign-import-details-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-get-campaign-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-generic-design-v3-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-mailing-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-simple-campaign-import-details-response-dto-schema.json
- aid: print-one:print-one-webhook-events-api
  name: print-one Webhook Events API
  description: 'You can find more information about webhooks in our help center.


    Below you can find a list of supported webhook events:


    order_status_update


    template_preview_rendered


    coupon_code_used


    qr_code_scanned


    mailing_sent'
  humanURL: https://docs.print.one/v3
  baseURL: https://api.print.one
  tags:
  - Webhook Events
  properties:
  - type: OpenAPI
    url: openapi/print-one-webhook-events-api-openapi.yml
  - type: JSONSchema
    url: json-schema/print-one-add-campaign-item-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-campaign-import-details-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-get-campaign-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-generic-design-v3-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-mailing-response-dto-schema.json
  - type: JSONSchema
    url: json-schema/print-one-simple-campaign-import-details-response-dto-schema.json
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 38
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

print-one API — frequently asked questions

Does print-one have an API?

Yes. APIs.io lists 10 APIs from print-one, including print-one Address API, print-one Campaigns API and print-one Coupons API, and 7 more.

Is there an OpenAPI specification for the print-one API?

Yes. APIs.io indexes 10 OpenAPI specifications for print-one, each linked for download from this page.

How do I authenticate with the print-one API?

print-one uses bearer-token authentication (apiKey/oauth2 · 2 schemes). The details are profiled on APIs.io as Print One Authentication.

Is the print-one API ready for AI agents?

print-one has a Kin Score of 58.9 out of 100 (strong) and an Agent Readiness score of 49.1 (agent-ready), scored by API Evangelist on 2026-10-31.

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