| Availability (valid 402 returned) | 100.0% of 160 probes · single vantage |
| Median 402 handshake | 84ms |
| p90 handshake | 441ms |
| Catalog price (advertised) | $0.15 |
| Live price (median demanded) | $0.15 |
| Price status | match |
| Protocol | x402 v2 |
| Category (our classification) | finance-crypto |
| Payment receiver | 0x1664…e4de · 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) | 2 calls/30d |
Curated ERC20 token balances across high-volume EVM chains with D1-backed historical wallet snapshots and source coverage. Price 0.15 USDC on Base via x402. Demo: https://wallet-portfolio-history-mcp.mtree.workers.dev/demo/tools/token_balances. Contact: …
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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