| Availability (valid 402 returned) | 100.0% of 160 probes |
| Median 402 handshake | 226ms |
| p90 handshake | 279ms |
| Catalog price (advertised) | $0.25 |
| Live price (median demanded) | $0.25 |
| Price status | match |
| Protocol | x402 v1 |
| Category (our classification) | finance-crypto |
| Payment receiver | 0xb1e8…1Bf9 · stable since Jul 12 |
| Base USDC inflow to this receiver wallet (30d, all sources — not just x402) | none observed |
| Second vantage | confirmed 402 from a second network path (Cloudflare edge), 4h ago |
| Discovery (.well-known/x402) | not found |
| Catalog volume (their metric) | 0 calls/30d |
JSON feed of arbitrage opportunities between Polymarket and Kalshi. Charged only when actionable opportunities are returned.
v1-legacy
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, corroborated by a second network path for this service.
Operator of arb.axryl.com? Dispute this rating. Scores are opinions based on automated measurements at the stated times.