Payments on Base + Solana
Compare · Checking an x402 endpoint before your agent pays
An x402 endpoint can be down, return the wrong data, quietly raise its price, or switch its payout wallet. Before an agent pays, there are four ways to find out.
| Pay and hope | Your own checks | On-chain explorers and dashboards | Lumière PayCheck | |
|---|---|---|---|---|
| Knows if it actually delivers | Only after paying | Only for endpoints you test yourself | Shows that payments happened, not whether the response was right | Yes: real test payments check that endpoints return what they promise |
| Payout wallet changed (possible hijack) | No | If you track it | You'd have to notice | Flagged, and checked against seller declarations, prior wallets and funding history |
| Sanctions (OFAC) screening of the payout wallet | No | If you build it | No | Yes: checked against the U.S. Treasury SDN list, refreshed daily |
| Price changes | You find out when you pay | If you compare quotes | After the fact | Compared with what the endpoint charged before |
| Answer before paying | No | Yes, for what you check | Not built for it | A proceed / caution / avoid verdict over API, MCP or the x402-paycheck SDK |
| Coverage | None | The endpoints you choose | Payment history across a network | Tens of thousands of x402 endpoints on Base and Solana, monitored continuously |
| Cost | Lost payments | Your engineering time | Usually free to browse | Checks are free; batch lookups $0.01 per 100 endpoints |
Other approaches vary by provider and setup. Lumière PayCheck details reflect how it works today.
Yes. Endpoint checks and the MCP server are free. Batch lookups and full reports are paid per call in USDC over x402.
Our tester makes real, small paid calls and checks that the response matches what the endpoint promises. Grades come only from what we observe.
No. Sellers can fund a test of a higher-priced endpoint, but the grade comes only from what that test finds.