| Availability (valid 402 returned) | 100.0% of 60 probes · single vantage |
| Median 402 handshake | 288ms |
| p90 handshake | 440ms |
| Catalog price (advertised) | $0.03 |
| Live price (median demanded) | $0.03 |
| Price status | match |
| Protocol | x402 v2 |
| Category (our classification) | agent-tools |
| Payment receiver | 0xe4b5…721b · stable since Jul 12 |
| Base USDC inflow to this receiver wallet (30d, all sources — not just x402) | shared receiver wallet — total inflow is not attributable to this domain alone |
| Discovery (.well-known/x402) | present |
| Catalog volume (their metric) | 1 calls/30d |
Human-in-the-loop approval for AI agents: one paid call puts a proposed action (title, summary, tool, args, risk) in front of the agent's human owner via a one-tap approve/deny link pushed to ntfy, Slack, Discord or any webhook. The agent gets approve | …
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 askhuman.grindfree.net? Dispute this rating. Scores are opinions based on automated measurements at the stated times.