FluxProof

公開価格、ポリシー、および変更ログのページを監視し、変更前後の証拠をソースURL、コンテンツハッシュ、変更履歴、署名付きウェブフックとともに返します。1ページにつき無料の毎日監視が1回利用可能で、有料パスは30日間の一回払いで、サブスクリプションは不要です。RESTおよびリモートMCPに対応。

workers.dev で表示

ホスト型 MCP サーバー

npx add-mcp 'https://fluxproof.neoaethel.workers.dev/mcp'

Claude Code、Codex、Cursor などにインストールできます

ドキュメント

Know the moment a page changes, and exactly what changed.

Point FluxProof at any public URL. When it changes you get what changed, with the before and after quoted from the page and a fingerprint of each version. Use it from your agent over MCP or from the API.

No account. No payment. No page content is exposed in the free preflight.

Free: 1 page for 30 days, no card · Monitor Pass: $9 for 5 pages · Evidence plans from $29 · See pricing

CAUGHT 21:00 UTC

Basic plan was $19.00 now $24.00 a month

Team plan was $57.00 now $72.00 a month

A real change FluxProof recorded on its own demo pricing page, which changes every hour. Fingerprint 1f49f51f…85c2. Open the page or read the ledger below.

One change, four ways to read it.

One line

Basic plan price: $24.00 → $21.00 · Team plan price: $72.00 → $63.00

On the Monitor Pass and Evidence plans, Claude reads each change and names the watched facts that changed, with old and new values.

Before and after

BEFORE

Removed: Price: $24.00 per month

Removed: Price: $72.00 per month

AFTER

Added: Price: $21.00 per month

Added: Price: $63.00 per month

Quoted from the page on every plan, free included. Fingerprints 1d1d3d1f… → 52755f75…

JSON

{
  "change_id": "chg_Rr8g4SQRe8YsohYToSFLJtMlzW0xAsYE",
  "monitor_id": "mon_a0bvYz11gr_MUfkhfjKDfZFg1zl187Mi",
  "observed_at": "2026-10-15T06:01:48.291Z",
  "prior_sha256": "1d1d3d1f8965d3af073022214b200408213b8d4ecba608f7afe42cb4237ac470",
  "current_sha256": "52755f75e4e26172c77cff0dcf659ed0411b3ed7ee9b9a970b967c394dffda3d",
  "significance": "low",
  "similarity": 1,
  "added": [
    "Price: $21.00 per month",
    "Price: $63.00 per month"
  ],
  "removed": [
    "Price: $24.00 per month",
    "Price: $72.00 per month"
  ],
  "matched_terms": [],
  "price": null,
  "exact": {
    "status": "changed",
    "changes": [
      {
        "item": "Basic plan price",
        "before": "$24.00",
        "after": "$21.00"
      },
      {
        "item": "Team plan price",
        "before": "$72.00",
        "after": "$63.00"
      }
    ],
    "model": "claude-haiku-5-5"
  }
}

MCP

→ tools/call fluxproof_list_changes
  {"monitor_id": "mon_a0bvYz11gr_MUfkhfjKDfZFg1zl187Mi", "limit": 1}

← 2026-10-15T06:01:48.291Z
  removed: Price: $24.00 per month | Price: $72.00 per month
  added:   Price: $21.00 per month | Price: $63.00 per month
  exact:   Basic plan price: $24.00 → $21.00 · Team plan price: $72.00 → $63.00

A real record from FluxProof's demo pricing page, 15 Oct 2026 at 06:01 UTC.

Add it to your agent in one paste.

Claude

claude mcp add --transport http fluxproof https://fluxproof.tryneverclosed.com/claude/mcp

Claude opens FluxProof's sign-in, where you create a free account, paste a key or try the demo. In the Claude apps, add https://fluxproof.tryneverclosed.com/claude/mcp as a custom connector. More

Cursor

{
  "mcpServers": {
    "fluxproof": {
      "url": "https://fluxproof.tryneverclosed.com/mcp",
      "headers": {
        "Authorization": "Bearer YOUR_FLUXPROOF_KEY"
      }
    }
  }
}

Paste into ~/.cursor/mcp.json with your key from the box above or from Pricing.

cURL

curl -X POST https://fluxproof.tryneverclosed.com/v1/monitors \
  -H "Authorization: Bearer $FLUXPROOF_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"url":"https://example.com/pricing","watch_terms":["price"]}'

The full walk-through is in the quickstart.

Source-bound Final URL + observed time

Hash-bound SHA-256 on normalized content

Quiet alerts Terms + semantic magnitude

Works with your tools Dashboard, webhooks, REST API, AI assistants (MCP)

Layout and styling changes are ignored.

01

Normalize

Scripts, styles, markup, and presentation churn are removed before comparison.

02

Compare

Stable text, watched terms, and magnitude determine the evidence level.

03

Deliver

People read a concise receipt. Agents receive deterministic JSON or a webhook.

Pricing changed. Here is the proof.

The newest change on the ledger above, the way FluxProof records it: where, when, both fingerprints, and exactly what was removed and added.

Page

/demo/pricing

Observed

2026-10-15 21:00 UTC

Prior

5b23…1512

Current

1f49…85c2

Removed

Basic · $19.00/month

Added

Basic · $24.00/month

Prove value free. Pay for recurrence.

FluxProof Free

$0

  • 1 source
  • Daily interval for 30 days
  • 35 checks in total: 30 daily checks (the first is the baseline) plus 5 manual checks
  • Latest evidence receipt
  • No webhook

FULL 30-DAY CAPACITY

FluxProof Monitor Pass

$9 a month, cancel any time

  • 5 monitored sources
  • 14,400 scheduled checks: all five at 15 minutes for 30 days, including baselines
  • 600 extra manual-check credits
  • 15,000 total checks
  • Full history and evidence excerpts
  • Each change read by Claude, which names exactly which watched facts changed, with old and new values
  • Signed HTTPS webhooks
  • REST + MCP agent access
  • Renews every 30 days until you cancel. We email you the day before each charge, and cancelling is one click

Need proof, not just a diff?

Evidence plans add price floors, email alerts and timestamped proof packets for brands watching resellers and for lawyers preserving pages. From $29 a month, cancel any time.

What a receipt shows

A receipt shows that a page's public text changed between two checks. It can't tell you why it changed or who changed it. Your rules decide which changes matter.