thirds.ai

Turn one design into content at scale. thirds.ai makes editable templates from a text prompt, HTML, a picture, or gallery and renders PDFs and images via a web app, REST API, or hosted MCP server. Outputs are PDF, PNG, JPEG, and WebP.

thirds.ai publishes 1 API on the APIs.io network: REST API. Tagged areas include pdf-automation, image-automation, Document Generation, HTML to PDF, and HTML to Image.

The thirds.ai catalog on APIs.io includes 1 event-driven AsyncAPI specification.

thirds.ai’s developer surface includes authentication, documentation, pricing, support, engineering blog, changelog, sandbox, and 17 more developer resources.

🌐 Visit website 📡 Source on GitHub

55.3/100 strong Agent 42/100 agent native Full breakdown ↓
scored 2026-09-18 · rubric v0.22.0

1 APIs 2 MCP Servers

pdf-automationimage-automationDocument Generation HTML to PDFHTML to Imagetemplate-renderingBranded ContentDeveloper Tools MCP Server agent-nativemarketing-ops

Kin Score

Kin Score How this is scored →
scored 2026-09-18 · rubric v0.22.0

Composite quality — 55.3/100 · strong

Contract Quality 14.2 / 23

Developer Ergonomics 10.2 / 18

Access Clarity 11.4 / 18

Operational Transparency 7.7 / 12

Contract Governance 0.5 / 11

Discoverability 6.5 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 42/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 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

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.

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/thirds-ai: 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 2

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

thirds.ai REST API

REST API for HTML-to-PDF, HTML-to-image, AI template generation, template editing, brand kits, rendering, and batch operations. Bearer API key auth with idempotency support.

thirds.ai MCP Server

Hosted MCP server exposing thirds.ai tools (create_brand_kit, create_template, edit_template, publish_template, render, create_batch, get_status, and more) over Streamable HTTP ...

MCP Servers 2

Model Context Protocol servers that expose these APIs to AI agents.

thirds.ai MCP Server

Official hosted MCP server exposing thirds.ai PDF/image rendering, template, brand-kit and batch tools over Streamable HTTP with bearer-token auth. Uses the caller's existing ac...

MCP SERVER

thirds.ai MCP Server

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Thirds Ai Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Thirds Ai Rate Limits

5 limits

RATE LIMITS

Event Specifications 1

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

Thirds Ai Webhooks

ASYNCAPI

Security Posture 3

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

Thirds Ai Authentication

apiKey/http · 2 schemes

SECURITY

Thirds Ai Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Thirds Ai Vulnerability Disclosure

contact published

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Sandbox

Sandbox

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

Conformance

Lifecycle

ErrorCatalog

DataModel

Webhooks

Scroll for all 7

Access & Security 4

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

Operate 3

Status, limits, changes, and where to get help

Support

Support

ChangeLog

ChangeLog

RateLimits

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

name: thirds.ai
description: Turn one design into content at scale. thirds.ai makes editable templates from a text prompt, HTML, a picture,
  or gallery and renders PDFs and images via a web app, REST API, or hosted MCP server. Outputs are PDF, PNG, JPEG, and WebP.
url: https://raw.githubusercontent.com/api-evangelist/thirds-ai/refs/heads/main/apis.yml
created: '2026-09-18'
modified: '2026-09-18'
specificationVersion: '0.21'
tags:
- pdf-automation
- image-automation
- Document Generation
- HTML to PDF
- HTML to Image
- template-rendering
- Branded Content
- Developer Tools
- MCP Server
- agent-native
- marketing-ops
tags_raw:
- pdf-automation
- image-automation
- document-generation
- html-to-pdf
- html-to-image
- template-rendering
- branded-content
- developer-tools
- mcp-server
- agent-native
- marketing-ops
apis:
- name: thirds.ai REST API
  description: REST API for HTML-to-PDF, HTML-to-image, AI template generation, template editing, brand kits, rendering, and
    batch operations. Bearer API key auth with idempotency support.
  humanURL: https://thirds.ai/docs/api-reference
  baseURL: https://thirds.ai/v1
  tags:
  - pdf-automation
  - image-automation
  - Document Generation
  - HTML to PDF
  - HTML to Image
  - template-rendering
  - Branded Content
  - Developer Tools
  - MCP Server
  - agent-native
  - marketing-ops
  tags_raw:
  - pdf-automation
  - image-automation
  - document-generation
  - html-to-pdf
  - html-to-image
  - template-rendering
  - branded-content
  - developer-tools
  - mcp-server
  - agent-native
  - marketing-ops
  properties:
  - type: OpenAPI
    url: openapi/thirds-ai-openapi.yml
  - type: OpenAPI
    url: https://thirds.ai/v1/openapi.json
  - type: Documentation
    url: https://thirds.ai/docs
  - type: LLMsTxt
    url: https://thirds.ai/llms.txt
  - type: Overlay
    url: overlays/thirds-ai-openapi-overlay.yaml
  - type: APIReference
    url: https://thirds.ai/docs/api-reference
  - type: GettingStarted
    url: https://thirds.ai/docs/quickstart
- name: thirds.ai MCP Server
  description: Hosted MCP server exposing thirds.ai tools (create_brand_kit, create_template, edit_template, publish_template,
    render, create_batch, get_status, and more) over Streamable HTTP with bearer-token auth. Uses your existing account, credits,
    and templates.
  humanURL: https://thirds.ai/docs/mcp
  baseURL: https://thirds.ai/mcp
  tags:
  - pdf-automation
  - image-automation
  - Document Generation
  - HTML to PDF
  - HTML to Image
  - template-rendering
  - Branded Content
  - Developer Tools
  - MCP Server
  - agent-native
  - marketing-ops
  tags_raw:
  - pdf-automation
  - image-automation
  - document-generation
  - html-to-pdf
  - html-to-image
  - template-rendering
  - branded-content
  - developer-tools
  - mcp-server
  - agent-native
  - marketing-ops
  properties:
  - type: MCPServer
    url: mcp/thirds-ai-mcp.yml
  - type: MCPServer
    url: https://thirds.ai/mcp
  - type: Documentation
    url: https://thirds.ai/docs/mcp
  - type: LLMsTxt
    url: https://thirds.ai/llms.txt
  - type: ToolCrosswalk
    url: mcp/thirds-ai-tool-crosswalk.yml
maintainers:
- FN: thirds.ai
  url: https://thirds.ai
  email: support@thirds.ai
generated:
  by: apis.io/add
  model: claude-opus-4-8
  confidence: 96
  at: '2026-09-18T09:14:04.214Z'
common:
- type: DomainSecurity
  url: security/thirds-ai-domain-security.yml
- type: Authentication
  url: authentication/thirds-ai-authentication.yml
- type: Website
  url: https://thirds.ai
- type: Documentation
  url: https://thirds.ai/docs
- type: Pricing
  url: https://thirds.ai/pricing
- type: Support
  url: https://thirds.ai/support
- type: Blog
  url: https://thirds.ai/blog
- type: TermsOfService
  url: https://thirds.ai/terms
- type: PrivacyPolicy
  url: https://thirds.ai/privacy
- type: ChangeLog
  url: https://thirds.ai/changelog
- type: LLMsTxt
  url: llms/thirds-ai-llms.txt
- type: Conventions
  url: conventions/thirds-ai-conventions.yml
- type: Idempotency
  url: conventions/thirds-ai-conventions.yml
- type: Conformance
  url: conformance/thirds-ai-conformance.yml
- type: Lifecycle
  url: lifecycle/thirds-ai-lifecycle.yml
- type: Plans
  url: plans/thirds-ai-plans-pricing.yml
- type: RateLimits
  url: rate-limits/thirds-ai-rate-limits.yml
- type: Sandbox
  url: sandbox/thirds-ai-sandbox.yml
- type: ErrorCatalog
  url: errors/thirds-ai-problem-types.yml
- type: DataModel
  url: data-model/thirds-ai-data-model.yml
- type: Webhooks
  url: asyncapi/thirds-ai-webhooks.yml
- type: AgentSkill
  url: skills/_index.yml
- type: VulnerabilityDisclosure
  url: security/thirds-ai-vulnerability-disclosure.yml
- type: Security
  url: security/thirds-ai-vulnerability-disclosure.yml
x-enrichment:
  date: '2026-09-18'
  status: enriched
  artifacts_added: 22
  pass: local-v3

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