x402 Seller Field Guide

caution grade B Base found on x402scan confidence 0.25
https://x402-preflight-grokbot.netlify.app/api/guide
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Advertised description
x402 Seller Field Guide (Markdown, ~18k chars): per-chain USDC EIP-712 name/version table that fixes 'FiatTokenV2: invalid signature', v2 PAYMENT-REQUIRED header gotchas, CDP vs PayAI facilitator setup…Show more ▾Show less ▴x402 Seller Field Guide (Markdown, ~18k chars): per-chain USDC EIP-712 name/version table that fixes 'FiatTokenV2: invalid signature', v2 PAYMENT-REQUIRED header gotchas, CDP vs PayAI facilitator setup (self_send_not_allowed, Bazaar listing after first settlement), discovery files, a Netlify Functions + Hono seller template, a pre-listing test checklist, and measured eth_getLogs limits. Free preview: /guide.html
(Provider-supplied: an unverified claim, not checked by us. The trust grade above is our independent measurement.)
30-day uptime
100.0%
Avg latency (EU)
1064 ms
slow · 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
Confidence
0.25
full-density score
Advertised price
$2
USDC
Price stability
Stable
last 30 days
Probes (30d)
5
full record · up to 48/day
More details ▾
Endpoint ID351212
Pay on Base$2 USDC · to 0x6573…10c1 ↗
First seen2026-10-28
Last probed2026-10-29
Statuslisted
Snapshot computed2026-10-29 16:41 UTC (free snapshot, recomputed at least every 24h)
Why this verdict?1 warning
A wallet payment page opens first; approve the USDC payment and the full JSON report loads right in your browser. Want a taste first? Read a free full sample report.
This page is the free cached snapshot (computed 15 hours ago, refreshed at least every 24h). Here's what the paid API adds.
  • ✓Live re-probe at decision time
    The score is computed the moment you ask, not up to 24h ago.
  • ✓Instant snapshot refresh
    Every paid call rewrites this page, the badge and the card immediately.
  • ✓The full “why”, machine-readable
    Confidence band, component breakdown, every risk flag with its evidence.
  • ✓On-chain settlement proof
    Real USDC volume and distinct payers behind the pay-to wallet.
  • ✓90-day raw history
    Every listing, price and payTo change, every probe result.
  • ✓Ranked better alternatives
    Higher-scored endpoints serving the same function, when they exist.
  • ✓Change & liveness alerts
    PayTo/price moves, spec regressions, downtime; 5-minute probes while watched.
$npx -y x402-trust-mcpGive your agents the tools to do all of this for you, with one install. Agents use the x402_trust_score MCP tool or POST /v1/x402-trust directly (pay-per-call over x402, from $0.005).