B12

aid: b12
name: B12
description: B12 is an AI-powered website builder that generates professional websites, online stores, and web apps from a
  short prompt. Founded on a human-in-the-loop model and now driven by its B12 3.0 AI Agent (launched February 2026), the
  platform lets solopreneurs, consultants, freelancers, and growing teams describe a business idea and launch a site in minutes,
  then run that business online with built-in tools for SEO, online payments and invoicing, scheduling, email marketing, client
  intake, contact management, and contracts with eSignatures. B12 offers self-serve DIY plans as well as Expert plans where
  its design and content team handles setup and ongoing updates. Over 4 million websites have been built on B12. B12 exposes
  its website-generation capability to AI agents through two live, anonymous, remote Model Context Protocol (MCP) endpoints,
  two provider-published Claude Agent Skills, and a Website Generator GPT, but publishes no general-purpose public REST API,
  no OpenAPI, and no developer portal.
url: https://raw.githubusercontent.com/api-evangelist/b12/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  license_evidence:
    not_product:
    - b12io/website-generator-mcp
  open_source: unknown
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - pricing
  - repository-not-product
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: high
  probe_state: covered
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://www.b12.io/static-assets/images/ai-website-builder.jpeg
x-type: company
x-source: vc-portfolio
x-backed-by:
- general-catalyst
x-tier: enriched
x-tier-reason: live MCP surface probed; provider-published skills, llms.txt and packages harvested
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-08-13'
tags:
- Company
- Enterprise
- Website Builder
- Artificial Intelligence
- No-Code
- Small Business
- Website Generation
- MCP
- SEO
- Payments
tags_raw:
- Company
- Enterprise
- Website Builder
- AI
- No-Code
- Small Business
- Website Generation
- Model Context Protocol
- SEO
- Payments
apis:
- name: B12 Website Generator MCP Server
  description: 'B12''s Model Context Protocol server, and the only machine-callable surface B12 publishes. It exposes a single
    tool, generate_website, which builds a website draft with AI from a business name, description, image keywords and subtitle,
    then returns a static preview image and a signup link to claim and edit the site. Two remote deployments run in parallel:
    mcp.b12.io/mcp serves Claude with an MCP-UI preview resource, and b12.io/mcp serves ChatGPT Apps. Both answer anonymously
    with no API key, token or OAuth challenge.'
  humanURL: https://github.com/b12io/website-generator-mcp-server
  baseURL: https://mcp.b12.io/mcp
  tags:
  - MCP
  - Website Generation
  - Artificial Intelligence
  tags_raw:
  - Model Context Protocol
  - Website Generation
  - AI
  properties:
  - type: MCPServer
    url: mcp/b12-mcp.yml
  - type: Authentication
    url: authentication/b12-authentication.yml
  - type: ErrorCatalog
    url: errors/b12-problem-types.yml
  - type: Conventions
    url: conventions/b12-conventions.yml
  - type: RateLimits
    url: rate-limits/b12-rate-limits.yml
  - type: SourceCode
    url: https://github.com/b12io/website-generator-mcp
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.b12.io
- type: MCPServer
  name: B12 Website Generator MCP Server
  url: mcp/b12-mcp.yml
- type: LLMsTxt
  url: llms/b12-llms.txt
- type: DomainSecurity
  url: security/b12-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/b12io
- type: HelpCenter
  url: https://support.b12.io/en
- type: Support
  url: https://www.b12.io/support/
- type: Blog
  url: https://www.b12.io/resource-center/
- type: Pricing
  url: https://www.b12.io/pricing/
- type: SignUp
  url: https://b12.io/signup/
- type: TermsOfService
  url: https://www.b12.io/terms-of-service/
- type: PrivacyPolicy
  url: https://www.b12.io/privacy-policy/
- type: Packages
  url: packages/b12-packages.yml
- type: AgentSkill
  name: B12 Claude Agent Skills (provider-published)
  url: skills/_index.yml
- type: Authentication
  url: authentication/b12-authentication.yml
- type: ErrorCatalog
  url: errors/b12-problem-types.yml
- type: Conventions
  url: conventions/b12-conventions.yml
- type: Conformance
  url: conformance/b12-conformance.yml
- type: Lifecycle
  url: lifecycle/b12-lifecycle.yml
- type: Components
  url: components/b12-components.yml
- type: RateLimits
  url: rate-limits/b12-rate-limits.yml
- type: Plans
  url: plans/b12-plans-pricing.yml
- type: ContentSignal
  name: Content Signals declaration in robots.txt (ai-train=yes, search=yes, ai-input=yes)
  url: well-known/b12-robots.txt
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 12
  pass: local-v1
x-coverage:
  state: covered
  note: 'B12 has no REST API and no OpenAPI, but it is not a thin profile: its agent surface is real, live and fully probeable.
    Two anonymous remote MCP endpoints returned complete tool schemas, and B12 publishes its own Agent Skills, an llms.txt
    and a Content Signals declaration.'
  checked: '2026-08-13'