Postscript

Postscript is an SMS and RCS marketing platform built for Shopify brands, covering list growth, campaign and automation delivery, conversational messaging, AI shopping assistants and TCPA compliance. Its developer surface is the Partner API v2 at api.postscript.io, a twenty-operation REST API authenticated with private API keys, through which partners and enterprise shops read and update SMS subscribers, read opt-in keywords, push custom events into Flow Builder, send promotional, transactional and conversational messages, manage webhook subscriptions for shop and subscriber lifecycle events, and run compliance unsubscribe and redaction operations. A browser JavaScript SDK carries the onsite opt-in popups, the checkout consent checkbox and browse-behaviour event tracking.

Postscript publishes 7 API contracts indexed on the APIs.io network, including Subscribers API, Events API, Keywords API, and 4 more. Tagged areas include SMS, Marketing, Messaging, E-Commerce, and Shopify.

The Postscript catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Postscript’s developer surface includes authentication, changelog, documentation, getting-started guide, API reference, pricing, engineering blog, and 37 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

69.0/100 exemplar ▬ flat Agent 43/100 agent ready Front door AI 4/6 moderate saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 5 Agent Skills

SMS Marketing Messaging E-Commerce Shopify RCS Subscribers Webhook Compliance

What this lets a business do 3

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Application Communications

AE-150

KeywordsMessages

POST /api/v2/message_requests GET /api/v2/keywords

Compliance Management

BC-130

Compliance

PATCH /api/v2/compliance/redact PATCH /api/v2/compliance/unsubscribe

Developer Platform & API Ecosystem Management

BC-4270

Webhooks

POST /api/v2/webhooks

Kin Score

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

Composite quality — 69.0/100 · exemplar

Contract Quality 11.7 / 19

Developer Ergonomics 9.0 / 15

Access Clarity 15.0 / 15

Operational Transparency 6.2 / 10

Contract Governance 1.6 / 9

Discoverability 5.6 / 8

Regulatory Posture 4.5 / 15

Create-or-Update Ergonomics 2.8 / 10

Agent readiness — 43/100 · 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 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 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Telecommunications 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/.

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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
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)
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Protected Resource Metadata +5 pts — a served /.well-known/oauth-protected-resource carrying `resource` (documented), and naming its authorization_servers (verified)

4 more unmet checks in the Agent Readiness table above.

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

Contract Governance scores 18.2 — up to +9.8 composite points
Contract Quality scores 62.2 — up to +9.5 composite points
Developer Ergonomics scores 60.1 — up to +8.0 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/postscript/apis.yml: open an issue on github.com/api-evangelist/postscript 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Reviews, Ratings and UGC (review platforms and who integrates with them)	builds-on	19.7 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 3

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.

RCS

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

Model Context Protocol (MCP)

measured — observed by APIs.io (verified)

OpenAPI

measured — observed by APIs.io (published)

APIs 7

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

Postscript Subscribers API

Read, filter, page and update a shop's SMS subscribers. Filters use suffixed operators (__eq, __gt, __contains, __in) across created_at, updated_at, email, phone_number, shopify...

Postscript Events API

Send custom events for use in Postscript Flows and triggers.

Postscript Keywords API

Read the opt-in keywords a shop has configured for subscriber acquisition and attribution.

Postscript Messages API

Send promotional, transactional or conversational SMS and MMS to an existing subscriber, and read the resulting message request and sent message.

Postscript Webhooks API

Create, read, update and delete webhook subscriptions, fetch the Postscript-Signature signing token, retrieve example event payloads and trigger test deliveries.

Postscript Compliance API

TCPA opt-out and data redaction for a subscriber, addressable by subscriber id, phone, email or Shopify customer id.

Postscript Identity API

Verify which partner or shop the calling API token resolves to.

Scroll for all 7

Agent Skills 5

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

Subscribe to and verify Postscript webhooks

AGENT SKILL

Send a custom event into Postscript Flows

AGENT SKILL

Send a message to a Postscript subscriber

AGENT SKILL

Sync and segment Postscript subscribers

AGENT SKILL

Honour an opt-out or erasure request in Postscript

AGENT SKILL

Postscript API pricing

Prices published by Postscript, read 2026-10-28 from postscript.io/pricing.

Plan	Price
Starter	$0/mo. Includes: $49 monthly minimum spend; Campaigns and automations, unlimited segments, dedicated toll-free number
Growth	$100/mo. Includes: Starter features, plus unlimited opt-in Keywords, live chat and email support
Professional	$500/mo. Includes: Growth features, plus Enhanced Analytics, priority support, API access, 'Powered by Postscript' remo
Enterprise	Contact us Includes: Professional features, plus dedicated CSM, custom product recommendations, Data Warehouse Push, opti
Postscript AI Plan	$699/mo. Includes: Brand Center, Infinity Testing, Shopper
Designated short code	$750/month Includes: Dedicated short code through carriers, passed through at cost

Plan details, limits and sources →

Rate limits

Per-token request rate: 15 requests per second

Rate-limit details →

Billed by: short code · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Postscript Plans Pricing

6 plans

PLANS

Postscript Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Postscript 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.

Postscript

SLA

FinOps 1

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

Postscript Finops

FINOPS

Event Specifications 1

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

Postscript Webhooks

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Postscript API Rules

61 rules · 56 errors 4 warnings 1 info

SPECTRAL

OpenAPI Overlays 7

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.

Postscript Compliance Api Overlay

4 actions · update · postscript-compliance-api-openapi.yml

DERIVED

Postscript Events Api Overlay

4 actions · update · postscript-events-api-openapi.yml

DERIVED

Postscript Identity Api Overlay

4 actions · update · postscript-identity-api-openapi.yml

DERIVED

Postscript Keywords Api Overlay

4 actions · update · postscript-keywords-api-openapi.yml

DERIVED

Postscript Messages Api Overlay

4 actions · update · postscript-messages-api-openapi.yml

DERIVED

Postscript Subscribers Api Overlay

4 actions · update · postscript-subscribers-api-openapi.yml

DERIVED

Postscript Webhooks Api Overlay

4 actions · update · postscript-webhooks-api-openapi.yml

DERIVED

Scroll for all 7

Security Posture 4

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

Postscript Authentication

apiKey · 2 schemes

SECURITY

Postscript Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Postscript Vulnerability Disclosure

no policy recorded

SECURITY

Postscript Trust Center

SOC 2, GDPR

SECURITY

Agentic Access 1

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

Postscript Agentic Access

20 operations · 9 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

X-MCPServerCandidate

AgentSkill

LLMsTxt

LlmsText

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conventions

Conformance

ErrorCatalog

Lifecycle

DataModel

Components

Webhooks

Scroll for all 7

Build 3

SDKs, sample code, and the tooling you integrate with

Packages

Packages

ToolCrosswalk

ToolCrosswalk

SDKs

SDKs

Access & Security 7

Authentication, authorization, and security posture

TrustCenter

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

DomainSecurity

Authentication

Authentication

Compliance

Scroll for all 7

Operate 6

Status, limits, changes, and where to get help

StatusPage

RateLimits

ChangeLog

RateLimits

ChangeLog

Support

Commercial 6

Pricing, plans, and the legal terms of use

FinOps

Plans

Pricing

TermsOfService

APITermsOfService

APITermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: postscript
name: Postscript
description: Postscript is an SMS and RCS marketing platform built for Shopify brands, covering list growth, campaign and
  automation delivery, conversational messaging, AI shopping assistants and TCPA compliance. Its developer surface is the
  Partner API v2 at api.postscript.io, a twenty-operation REST API authenticated with private API keys, through which partners
  and enterprise shops read and update SMS subscribers, read opt-in keywords, push custom events into Flow Builder, send promotional,
  transactional and conversational messages, manage webhook subscriptions for shop and subscriber lifecycle events, and run
  compliance unsubscribe and redaction operations. A browser JavaScript SDK carries the onsite opt-in popups, the checkout
  consent checkbox and browse-behaviour event tracking.
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: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  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/postscript.png
x-docs-platform: readme
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-04
tags:
- SMS
- Marketing
- Messaging
- E-Commerce
- Shopify
- RCS
- Subscribers
- Webhook
- Compliance
tags_raw:
- SMS
- Marketing
- Messaging
- E-commerce
- Shopify
- RCS
- Subscribers
- Webhooks
- Compliance
url: https://raw.githubusercontent.com/api-evangelist/postscript/refs/heads/main/apis.yml
created: '2025-01-01'
modified: '2026-08-13'
specificationVersion: '0.23'
apis:
- aid: postscript:postscript-subscribers-api
  name: Postscript Subscribers API
  description: Read, filter, page and update a shop's SMS subscribers. Filters use suffixed operators (__eq, __gt, __contains,
    __in) across created_at, updated_at, email, phone_number, shopify_customer_id and ps_id.
  humanURL: https://developers.postscript.io/reference/get-subscribers
  baseURL: https://api.postscript.io
  tags:
  - Subscribers
  properties:
  - type: OpenAPI
    url: openapi/postscript-subscribers-api-openapi.yml
  - type: Overlay
    url: overlays/postscript-subscribers-api-overlay.yaml
- aid: postscript:postscript-events-api
  name: Postscript Events API
  description: Send custom events for use in Postscript Flows and triggers.
  humanURL: https://developers.postscript.io/reference/create-custom-event
  baseURL: https://api.postscript.io
  tags:
  - Event
  tags_raw:
  - Events
  properties:
  - type: OpenAPI
    url: openapi/postscript-events-api-openapi.yml
  - type: Overlay
    url: overlays/postscript-events-api-overlay.yaml
- aid: postscript:postscript-keywords-api
  name: Postscript Keywords API
  description: Read the opt-in keywords a shop has configured for subscriber acquisition and attribution.
  humanURL: https://developers.postscript.io/reference/get-keywords
  baseURL: https://api.postscript.io
  tags:
  - Keywords
  properties:
  - type: OpenAPI
    url: openapi/postscript-keywords-api-openapi.yml
  - type: Overlay
    url: overlays/postscript-keywords-api-overlay.yaml
- aid: postscript:postscript-messages-api
  name: Postscript Messages API
  description: Send promotional, transactional or conversational SMS and MMS to an existing subscriber, and read the resulting
    message request and sent message.
  humanURL: https://developers.postscript.io/reference/create-message
  baseURL: https://api.postscript.io
  tags:
  - Message
  - SMS
  tags_raw:
  - Messages
  - SMS
  properties:
  - type: OpenAPI
    url: openapi/postscript-messages-api-openapi.yml
  - type: Overlay
    url: overlays/postscript-messages-api-overlay.yaml
- aid: postscript:postscript-webhooks-api
  name: Postscript Webhooks API
  description: Create, read, update and delete webhook subscriptions, fetch the Postscript-Signature signing token, retrieve
    example event payloads and trigger test deliveries.
  humanURL: https://developers.postscript.io/docs/configuring-webhooks
  baseURL: https://api.postscript.io
  tags:
  - Webhook
  - Event
  tags_raw:
  - Webhooks
  - Events
  properties:
  - type: OpenAPI
    url: openapi/postscript-webhooks-api-openapi.yml
  - type: Overlay
    url: overlays/postscript-webhooks-api-overlay.yaml
  - type: Webhooks
    url: asyncapi/postscript-webhooks.yml
- aid: postscript:postscript-compliance-api
  name: Postscript Compliance API
  description: TCPA opt-out and data redaction for a subscriber, addressable by subscriber id, phone, email or Shopify customer
    id.
  humanURL: https://developers.postscript.io/reference/unsubscribe
  baseURL: https://api.postscript.io
  tags:
  - Compliance
  - Subscribers
  properties:
  - type: OpenAPI
    url: openapi/postscript-compliance-api-openapi.yml
  - type: Overlay
    url: overlays/postscript-compliance-api-overlay.yaml
- aid: postscript:postscript-identity-api
  name: Postscript Identity API
  description: Verify which partner or shop the calling API token resolves to.
  humanURL: https://developers.postscript.io/reference/verify-identity
  baseURL: https://api.postscript.io
  tags:
  - Identity
  properties:
  - type: OpenAPI
    url: openapi/postscript-identity-api-openapi.yml
  - type: Overlay
    url: overlays/postscript-identity-api-overlay.yaml
common:
- type: FinOps
  url: finops/postscript-finops.yml
- type: CapabilityMap
  url: capabilities/postscript-capability-edges.yml
  name: Postscript Business Capability Map
- type: AgenticAccess
  url: agentic-access/postscript-agentic-access.yml
- type: TrustCenter
  url: security/postscript-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/postscript-vulnerability-disclosure.yml
- type: Security
  url: https://postscript.io/security
- type: DomainSecurity
  url: security/postscript-domain-security.yml
- type: Authentication
  url: authentication/postscript-authentication.yml
- type: Conventions
  url: conventions/postscript-conventions.yml
- type: Conformance
  url: conformance/postscript-conformance.yml
- type: ErrorCatalog
  url: errors/postscript-error-codes.yml
- type: Lifecycle
  url: lifecycle/postscript-lifecycle.yml
- type: StatusPage
  url: https://status.postscript.io
- type: DataModel
  url: data-model/postscript-data-model.yml
- type: Packages
  url: packages/postscript-packages.yml
- type: Components
  url: components/postscript-components.yml
- type: X-MCPServerCandidate
  url: mcp/postscript-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: ToolCrosswalk
  url: mcp/postscript-tool-crosswalk.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Webhooks
  url: asyncapi/postscript-webhooks.yml
- type: LLMsTxt
  url: llms/postscript-llms.txt
- type: Plans
  url: plans/postscript-plans-pricing.yml
- type: RateLimits
  url: rate-limits/postscript-rate-limits.yml
- type: ChangeLog
  url: changelog/postscript-changelog.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/postscriptio
- type: Website
  url: https://postscript.io
- type: DeveloperPortal
  url: https://developers.postscript.io
- type: Documentation
  url: https://developers.postscript.io
- type: GettingStarted
  url: https://developers.postscript.io/docs/getting-started
- type: Authentication
  url: https://developers.postscript.io/docs/api-authentication
- type: RateLimits
  url: https://developers.postscript.io/docs/rate-limits
- type: Compliance
  url: https://developers.postscript.io/docs/compliance
- type: APIReference
  url: https://developers.postscript.io/reference
- type: ChangeLog
  url: https://developers.postscript.io/changelog
- type: SDKs
  url: https://developers.postscript.io/docs/javascript-sdk-api-reference
- type: Integrations
  url: https://developers.postscript.io/docs/how-to-use-zapier-with-our-api
- type: Pricing
  url: https://postscript.io/pricing
- type: Blog
  url: https://postscript.io/blog
- type: Support
  url: https://help.postscript.io
- type: SignUp
  url: https://postscript.io/partners-signup
- type: Login
  url: https://app.postscript.io/login
- type: TermsOfService
  url: https://postscript.io/terms-of-service
- type: APITermsOfService
  url: https://postscript.io/api-terms-of-service
- type: PrivacyPolicy
  url: https://postscript.io/privacy
- type: LlmsText
  url: https://developers.postscript.io/llms.txt
integrations:
- name: Postscript
- name: True Classic CaseStudy-FEATURE IMG
- name: Integration-hero_img
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 33
  pass: local-v1

Postscript API — frequently asked questions

Does Postscript have an API?

Yes. APIs.io lists 7 APIs from Postscript, including Postscript Subscribers API, Postscript Events API and Postscript Keywords API, and 4 more.

Is there an OpenAPI specification for the Postscript API?

Yes. APIs.io indexes 7 OpenAPI specifications for Postscript, each linked for download from this page.

How do I authenticate with the Postscript API?

Postscript uses bearer-token authentication (apiKey · 2 schemes). The details are profiled on APIs.io as Postscript Authentication.

How much does the Postscript API cost?

Postscript publishes its prices; its Starter plan is $0/mo. as of 2026-10-28. APIs.io lists 6 pricing plans for Postscript, with each plan's price, limits and inclusions under Pricing on this page.

Is the Postscript API ready for AI agents?

Postscript has a Kin Score of 69.0 out of 100 (exemplar) and an Agent Readiness score of 42.8 (agent-ready), scored by API Evangelist on 2026-11-06.

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