#endpoint verification Startups & Tools

Autonomous API payments introduce a vulnerability: endpoints can fail, return incorrect data, quietly raise prices, or redirect funds to compromised wallets—with agents discovering problems only after transactions settle. Lumière PayCheck addresses this gap by serving as a verification layer that validates x402 endpoints before payment occurs, ensuring agents access services that deliver as promised. The platform monitors roughly 64,000 x402 endpoints across blockchain networks and executes real test payments to confirm endpoint integrity. This active verification approach—checking actual performance rather than relying on passive monitoring—distinguishes the product. Each endpoint receives classification as proceed, caution, or avoid, giving agent builders immediate risk assessment for payment decisions. Integration flexibility removes adoption barriers. The service reaches developers through a free REST API, MCP server compatibility (integrated with Claude and Cursor), or the x402-paycheck npm package. The free tier serves individual developers without payment requirements, while API keys enable higher rate limits for scaling. For teams, Lumière PayCheck adds governance and compliance layers. Features span per-agent spending caps, manual review workflows for unusual payments, signed receipts with full audit trails, and sanctions screening of payout wallet addresses. These additions position the product for finance and compliance operations, not solely development teams. Current monitoring data shows approximately 57,900 endpoints passing validation from a tracked base of 64,000, suggesting substantial adoption within the x402 ecosystem. Team pricing starts at $200 monthly plus $750 setup, with bundled agent features at $500 monthly plus $2,000 setup. This cost structure targets organizations automating invoicing, quote follow-ups, missed-call management, insurance verification, and receipt tracking.