| Availability (valid 402 returned) | 100.0% of 147 probes · single vantage |
| Median 402 handshake | 295ms |
| p90 handshake | 817ms |
| Catalog price (advertised) | $0.01 |
| Live price (median demanded) | $0.01 |
| Price status | match |
| Protocol | x402 v2 |
| Category (our classification) | agent-tools |
| Payment receiver | 0xd6b7…5b1b · stable since Jul 12 |
| Base USDC inflow to this receiver wallet (30d, all sources — not just x402) | none observed |
| Discovery (.well-known/x402) | not found |
| Catalog volume (their metric) | 1 calls/30d |
$0.01 AI-agent tool-call preflight: return ALLOW, REVIEW, or BLOCK before an MCP/tool call, payment, fetch, message, write, or execution. One deterministic request combines prompt-injection and hidden-Unicode scanning, SSRF/unsafe-URL screening, JSON …
What this grade does and doesn't measure: it scores the paid-request handshake — whether the service returns a spec-valid 402 payment challenge, how fast, and whether its price is honest. We do not pay these endpoints yet, so we do not verify that the paid response returns correct or complete content. Availability is a probe success rate measured hourly, from a single network vantage for this service.
Operator of goldkey-edge-storefront.noah-ing.workers.dev? Dispute this rating. Scores are opinions based on automated measurements at the stated times.