solar.halowerk.com/shadow-simulator
As of 2026-08-15, solar.halowerk.com/shadow-simulator on Base held a flawless 100.0% uptime across 37 reliability checks since first seen 2026-08-14 (1 day). Responses came back moderate at 191 ms average from a single EU vantage point (so this includes network distance to the endpoint) and it has held its advertised price steady at $0.0020. Its x402-trust grade is B (score 70.6 from a moderate sample, tracked for 1 day), but confidence is still limited, so treat the grade as provisional rather than a green light.
Pure astronomy and geometry on level ground: sun position by the NOAA method, shadow length as object height divided by the tangent of the sun elevation. Refraction is only applied to sunrise and sunset. Terrain slope, surrounding buildings, vegetation and diffuse light are not modelled, so a point outside the shadow can still be shaded in reality. Times are UTC.(Provider-supplied: an unverified claim, not checked by us. The trust grade above is our independent measurement.)
POST /v1/x402-trust or the x402_trust_score MCP tool.Latency is measured from a single EU vantage point; includes network round-trip distance to the endpoint; a geographically distant endpoint reads slower even when its server is fast, so it is only lightly weighted in the score.
10 better-scored endpoints serving a semantically similar purpose exist.
We don't reveal which ones here. The ranked list (resource URLs, exact scores, prices & similarity, etc...) is one paid call away. Purchase it right here with a browser wallet, no code required:
A wallet payment page opens first; approve the USDC payment and the ranked JSON list loads right in your browser. Agents use the x402_find_alternatives MCP tool or POST /v1/similar directly.
Full observation record ▾
| Trust grade | B (score 70.6) |
| Recommendation | caution |
| Confidence | 0.47, full-density (every probe in the 30-day window) |
| 30-day uptime | 100.0% |
| Avg latency (EU vantage) | 191 ms |
| Probes (30d) | 37 |
| Advertised price | $0.002 USDC |
| Price stability (30d) | stable |
| Network | eip155:8453 |
| First seen | 2026-08-14 |
| Last probed | 2026-08-15 |
| Status | listed |
| Snapshot computed | 2026-08-15 14:17 UTC |
- ✓Live probe at decision time:
We re-check the endpoint the moment you ask (timestamped) and compute the score from all scores up until this moment, instead of this cached snapshot that may be up to 24h old. - ✓Confidence band, full component breakdown & structured risk flags:
Exactly why the score is what it is, machine-readable. - ✓On-chain settlement proof:
Real USDC volume & distinct-payer count for the payTo wallet: is anyone actually paying it? - ✓90-day raw history:
Every listing/price/payTo change and probe result (viaPOST /v1/x402-history), up to 90 days back. - ✓The ranked better-scored alternatives:
The resource URLs, scores & prices we don't reveal above (viaPOST /v1/similar), if there are better alternatives available. - ✓Change & liveness alerts:
Get notified on payTo/price changes, spec regressions or downtime (viaPOST /v1/watch-endpoint-30d). Connect up to 10 Discord / Slack webhooks or poll regularly with bearer auth. Increases probe-density to every 5 minutes instead of the usual 30 for the watched endpoint.
... Simply give your agents the tools to do all of that for you, with a simple command
npx -y x402-trust-mcpPrefer HTTP? Call POST /v1/x402-trust directly (pay-per-call over x402, from $0.005).