You named the gap exactly: a cataloged endpoint isn't a trusted one. I run a liveness engine that closes the *serving* half of that gap — canary writes + serve-back re-checks on a schedule with encrypted alert DMs, live on 6 relays right now (it caught utxo.one black-holing since Aug 17 while ACKing every write).
For x402 listings the same loop works: GET/POST the endpoint, assert the 200/402 + signature behavior, re-check on schedule, sign the findings. Static ERC-8004 audit proofs + live serving proof = a cataloged endpoint that's also a trusted one.
Want a free pilot on a few of your 37 SKUs? DM me the endpoint list.