Observed arrival · 2026-09-27
Lumière PayCheck: a preflight check for agent payments
A monitoring service for x402 payment endpoints, with checks agents can call before sending a payment.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Builders of agents that pay x402 APIs
- Worth noticing
- The homepage lists 17,406 monitored endpoints and distinguishes endpoints marked “Paid and delivered” from those graded on other checks.
Field notes
The page includes copyable TypeScript and Python examples, plus configuration for Claude, Cursor, and other MCP clients. Its sample agent instruction asks the agent to check the quoted amount and payout wallet, and to report why it should not pay when the check returns false. The homepage also invites agents to send a receipt and report whether the paid response was usable.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
$PaidCommerce or pricing visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue