Open Standard · Web4 Page Framework v1

Your website works for humans.
A Web4 Page works for both.

A Web4 Page is a new AI-native webpage that enables human-to-agent and agent-to-agent interactions — giving AI the ability to read, discover, write, and act on behalf of any entity on the internet. Without one, AI cannot find you, cite you, or do business with you.

Build your Web4 Page →See the framework$ bigsearch init

The AI Visibility Gap

90%

of the internet is
invisible to AI

14B+

AI queries per day
with no standard

58%

drop in organic CTR
when AI Overviews appear

tools exist to control
how AI represents you

The Framework

Web4 Page Framework

A new AI-native webpage that enables human-to-agent and agent-to-agent interactions. Four capability zones — from being understood by AI to being operated by AI.

LLMS.TXTGrounding Page

JSON-LDDeclared identity

OPENAPIAction capability

MCP ENDPOINTSReal-time operation

READDISCOVERWRITEACT

FREE

Step 1 — READ

AI understands who you are

Add your business name, description, products, and llms.txt grounding text. Go from invisible to cited in 60 seconds.

llms.txtgrounding60 sec

FREE

Step 2 — DISCOVER

AI can find and cite you

Auto-generates JSON-LD from your profile. Side B machine-readable. Entity Score calculated. AI models can now discover and cite your entity.

JSON-LDschema.orgEntity Score

$99.99/mo

Step 3 — WRITE

AI can transact with you

Link or generate an OpenAPI spec. Now AI can book appointments, place orders, check inventory — and financial institutions declare their AI-facing API for CFPB compliance.

OpenAPIRESTCFPB

ENTERPRISE

Step 4 — ACT

AI agents operate with you

Register an MCP endpoint. AI agents can now autonomously operate your business in real time — the full agentic web, with your entity at the center.

MCPagentsreal-time

Build + Deploy

From your IDE to the Registry Index

Build a Web4 Page in the no-code builder or from your terminal. Once published, it's indexed instantly — and crawled by AI models on their own schedules.

🏗️

Build

Builder UI or web4page.json in Cursor

→

✅

Validate

Check against open spec at web4page.org

→

🚀

Publish

bigsearch publish or click Publish in builder

→

📇

Indexed

Canonical URL live at bigsearchai.com/b/{slug}

→

🤖

Crawled

AI models crawl registries on their own schedules

→

💬

Cited

Your entity appears in AI answers

# Developer path — install the CLI
npm install -g bigsearch-cli

# Scaffold a web4page.json in your project
bigsearch init

# Validate against the open spec
bigsearch validate

# Publish to the registry
bigsearch publish

# Returns your canonical index URL
→ indexed: true
→ url: bigsearchai.com/b/your-entity
→ entityScore: 74

# Or self-host — drop your file at:
yourdomain.com/.well-known/web4page.json
# Registry crawlers discover it automatically

Research

The infrastructure behind Web4

Web4 is built on a decade of foundational research in transport protocols, AI agents, decentralized identity, and structured data. These are the papers and standards that define the stack.

Transport · IETF Standard