x402donghang.duckdns.org

79.7 / 100 · rank 1510 of 1592

last 120 hours · short tick = valid 402 · full tick = invalid or no answer · faint = not probed

score components (0-100) · not the raw measurements below

Availability91

Latency67

Price integrity44

Protocol100

Consistency100

Availability is the one component that is a success rate, so it alone carries an evidence discount: it enters as the 95% Wilson lower bound of the measured share (cubed), which is why its bar reads below the raw percentage above — thin evidence scores below a long proven record. Latency, price, protocol and consistency are direct measurements, shown as-is.

Availability (valid 402 returned)	100.0% of 117 probes
Median 402 handshake	791ms
p90 handshake	837ms
Catalog price (advertised)	$0.01
Live price (median demanded)	$10
Price status	match
Protocol	x402 v2
Category (our classification)	other
Payment receiver	0x7F39…5B3d (+1 more) · stable since Jul 12
Base USDC settlement to this receiver wallet (30d' measured by us)	x402-plausible (amount matches a listed price): $0 · 11 transfers · 1 distinct senders. All USDC inflow' upper bound incl. non-x402: $0 · 11 transfers.
Second vantage	confirmed 402 from a second network path (Cloudflare edge), 3h ago
Discovery (.well-known/x402)	present
Catalog volume (their metric)	12 calls/30d

listed products (catalog path · advertised price · live price we measured)

/x402/v1/crypto-radar	$0.03	$0.19 (differs)
/x402/v1/chat/completions	$0.01	not yet probed
/x402/v1/crypto-brief	$0.03	not yet probed
/x402/v1/summarize	$0.02	not yet probed

grade evidence: hourly probes of /x402/v1/chat/completions. Availability, latency and protocol measure the operator's shared infrastructure and generalize across its products; the price check applies to the probed product. We now also probe one other product per hour, rotating; "live price we measured" shows what each answered.

event log (from our catalog snapshots and probes)

2026-08-15 15:46	price changed $0.01 → $10
2026-08-13 23:12	price changed $0.03 → $0.01

Seller description of the probed product (one of 4 listed) · unverified · not part of the rating

Grok 4.5 High chat via x402. OpenAI-compatible /v1/chat/completions, streaming supported. Listed as grok-4.5-high. $0.01 USDC per request on Base/Solana mainnet. See GET /x402/v1/models for the full chat catalog.

Embed this grade (free, always current)

<a href="https://x402register.com/s/x402donghang.duckdns.org.html"><img src="https://x402register.com/badge/x402donghang.duckdns.org.svg" alt="x402 register grade B"></a>

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 x402donghang.duckdns.org? Dispute this rating. Scores are opinions based on automated measurements at the stated times.