underground.substratesymposium.com/buy/delta_songs_collection_1
x402 endpoint · grade C · score 55.0 · confidence 0.43
As of 2026-06-30, underground.substratesymposium.com/buy/delta_songs_collection_1 on Base held a flawless 100.0% uptime across 5 reliability checks over the past 30 days. Responses came back moderate at 345 ms median and it has held its advertised price steady at $4.99. Its x402-trust grade is C (score 55.0 from a moderate sample, tracked for 18 days), so it is best avoided for now. It is no longer listed in the x402 directory.
| Trust grade | C (score 55.0) |
| Recommendation | avoid |
| Confidence | 0.43 — free tier, reduced density (every 6th probe) |
| 30-day uptime | 100.0% |
| Median latency | 345 ms |
| Probes (30d, sampled) | 5 |
| Advertised price | $4.99 USDC |
| Price stability (30d) | stable |
| Network | eip155:8453 |
| First seen | 2026-06-12 |
| Last probed | 2026-06-19 |
| Status | delisted |
| Snapshot computed | 2026-06-30 14:20 UTC |
Need more than the free snapshot? The paid API adds a live probe at decision time (with timestamp), full 30-minute probe density & confidence, 90-day history, on-chain settlement correlation, and watch/alerting.
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POST /v1/x402-trust · POST /v1/x402-history · free MCP: npx -y x402-trust-mcp