# FluxProof

> Evidence-bearing public webpage change monitoring for people and agents.

## Start here
- [Product and pricing](https://fluxproof.tryneverclosed.com/)
- [Quickstart](https://fluxproof.tryneverclosed.com/quickstart)
- [REST API specification](https://fluxproof.tryneverclosed.com/openapi.json)
- [MCP discovery](https://fluxproof.tryneverclosed.com/.well-known/mcp/server-card.json)
- [Payment and free offers](https://fluxproof.tryneverclosed.com/.well-known/agent-commerce.json)
- [Policies](https://fluxproof.tryneverclosed.com/policies)
- [A2A agent card](https://fluxproof.tryneverclosed.com/.well-known/agent-card.json)

Remote MCP: https://fluxproof.tryneverclosed.com/mcp
Server: io.github.equinoxaifinance-rgb/fluxproof

Free: one daily monitor for 30 days, 35 checks in total: 30 daily checks (the first is the baseline) plus 5 manual checks, latest receipt, no webhook. Paid: $9 once for 30 days, five monitors, 15,000 total checks, minimum 15-minute interval, history and signed webhooks.

Preflight a public URL before purchase. Discovery and preflight do not charge. Payment requires the buyer's authority. Use a buyer-owned API key in the Authorization Bearer header for REST; MCP authenticated tools accept the same Authorization Bearer header, or an api_key tool argument as a fallback; prefer the header so keys stay out of tool transcripts. Never send keys to third-party pages.

Coverage: public HTML/text/JSON/XML up to 3 MB; no login, browser JavaScript rendering, CAPTCHA bypass or native email/SMS. Significance is a deterministic text signal, not proof of a source's truth or business impact.

Errors return a stable error code plus a plain-language message saying what to fix.

Only metadata, documentation and bounded free access are public. The commercial engine and source are private; buying service access grants no redistribution rights.