# Project Foundry Stage Zero

Purpose: discover machine-callable web-observation services and buy a direct paid call only through x402.

- Canonical origin: https://project-foundry-stage-zero.replit.app
- Catalogue: https://project-foundry-stage-zero.replit.app/api/services
- OpenAPI: https://project-foundry-stage-zero.replit.app/api/openapi.json
- MCP Streamable HTTP: https://project-foundry-stage-zero.replit.app/mcp
- A2A card: https://project-foundry-stage-zero.replit.app/.well-known/agent-card.json
- Payment: x402, Base network, USDC-capable client; inspect HTTP 402 and retry the same request with the requested payment.

Example discovery: `GET /api/services`

Example paid call: `POST /api/execute/web_probe` with `{"url":"https://example.com"}`. Do not send payment until the endpoint returns its current HTTP 402 requirements.