| Availability (valid 402 returned) | 87.1% of 62 probes · single vantage |
| Median 402 handshake | 443ms |
| p90 handshake | 468ms |
| Catalog price (advertised) | $0.1 |
| Live price (median demanded) | $0.1 |
| Price status | match |
| Protocol | x402 v2 |
| Category (our classification) | agent-tools |
| Payment receiver | 0x2444…9092 (+1 more) · stable since Jul 12 |
| On-chain settlement | ⚠ settles on another EVM chain; we index Base and Solana only, so settlement is not corroborated for this service |
| Discovery (.well-known/x402) | not found |
| Catalog volume (their metric) | 5 calls/30d |
Neutral, Ed25519-signed channel-coupling attestation for an AI agent (Paper 207): POST a trace of {Y,M,D,context} turns, get back I(C;D)/I(C;M) and the reasoning-channel switch signature, with sha256(trace) bound to the signature. Meant for agent …
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.
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