# B12

**Canonical:** https://apis.io/providers/b12/  
**Website:** https://www.b12.io  
**APIs profiled:** 1

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.

## Kin Score — 32.7 / 100 (thin)

Scored 2026-08-17 under rubric 0.11.0. Trend: rising (+13.8 from 18.9).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 0.0 |
| Governance | 12.5 |
| Operational Transparency | 5.3 |
| Developer Ergonomics | 32.6 |
| Commercial Clarity | 76.3 |

Regulatory layer — **Payments**: 39.1 (matched via tags).

## Agent readiness — 33.8 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| MCP Server | yes |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | yes |
| Well Known Catalog | no |
| Consent Identity | yes |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## APIs (1)

- **B12 Website Generator MCP Server** — 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...

## MCP servers (1)

- **b12-mcp.yml**

## Security (2)

- **B12 Authentication** — none · 2 schemes
- **B12 Domain Security** — TLSv1.3 · HSTS · DMARC

## Plans (1)

- **B12 Plans Pricing**

## Tags

Company, Enterprise, Website Builder, AI, No-Code, Small Business, Website Generation, Model Context Protocol, SEO, Payments

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/b12/). Scores are computed from the provider's own public artifacts under a published rubric.