Lumière PayCheck

Check any x402 endpoint before your agent pays it.

CommunityOnlineNo sign-inGlobalFreeCan modify data

What it can do

  • Check Endpoint: Before paying an x402 endpoint, get its trust score (0-100), grade (A-F), and a verdict: proceed, caution, avoid, free, or insufficient_data. Based on continuous monitoring and real te
  • Check Payment: Before paying, check a specific payment against spending rules: is the endpoint trustworthy, is the amount within the cap and not above the monitored price, and is the payTo wallet the
  • Report Outcome: After paying an x402 endpoint using a Lumière PayCheck receipt (from /v1/authorize), report whether the response was usable. This helps keep x402 safe for every agent: problem reports

What data it sees

Do you need an account

No: the server works without sign-in

Check any x402 endpoint before your agent pays it.

Lumière PayCheck monitors 19,000+ x402 endpoints from the Bazaar every 30 minutes and makes real test payments to confirm they deliver what they charge for. Your agent gets a clear answer before any money moves.

What your agent can do

  • Check an endpoint: trust score (0–100), grade (A–F), and a verdict: proceed, caution, or avoid
  • Authorize a payment: confirm the price isn't inflated and the payout wallet hasn't been swapped (hijack detection) before paying
  • Find safe endpoints: the most trustworthy x402 services right now, ranked
  • Report outcomes: flag a paid call that didn't deliver, which triggers an independent re-test

Why trust it

  • Real paid delivery tests, not just uptime pings
  • Payout-wallet changes checked against seller declarations and on-chain evidence
  • Published scoring formula; grades are never paid for

Free to use

No API key or signup. Add the server and ask your agent to check before it pays.

For teams

Running several agents? Plans give each agent its own key with spend limits, human review for unusual payments, signed receipts, and a full audit trail. Builder $9/mo · Business $49/mo · Enterprise custom → lumierepaycheck.org/subscribe

Website · Docs

How to connect

How to connect Lumière PayCheck to Claude

The server address to paste into Claude settings:

https://paycheck--jahman-el.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect Lumière PayCheck to ChatGPT

The server address to paste into ChatGPT settings:

https://paycheck--jahman-el.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect Lumière PayCheck to Cursor

The server address to paste into Cursor settings:

https://paycheck--jahman-el.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (6)

Raw names from tools/list. Only developers need these.

check_endpointBefore paying an x402 endpoint, get its trust score (0-100), grade (A-F), and a verdict: proceed, caution, avoid, free, or insufficient_data. Based on continuous monitoring and real test payments.
check_paymentBefore paying, check a specific payment against spending rules: is the endpoint trustworthy, is the amount within the cap and not above the monitored price, and is the payTo wallet the one we've observed (catches hijacks). Returns allow true/false with reasons. If you pay with a Lumière PayCheck receipt, please call report_outcome afterward.
report_outcomeAfter paying an x402 endpoint using a Lumière PayCheck receipt (from /v1/authorize), report whether the response was usable. This helps keep x402 safe for every agent: problem reports from several independent buyers trigger a paid re-test. Reports never change a grade by themselves. Skip this if the user asked you not to report.
top_endpointsList the x402 endpoints currently safest to pay (verdict proceed or caution, no payout-wallet incidents), best first.
catalog_statsHow many x402 endpoints are monitored and how many fall into each verdict.
get_full_reportExplains how to buy the detailed report for an endpoint (score breakdown, current price quote, wallet and price history, test-payment results). The report itself is a paid x402 endpoint.