launchcheck-x402.fly.dev

92.7 / 100 · rank 1202 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

Availability90

Latency100

Price integrity98

Protocol100

Consistency75

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)	99.4% of 168 probes
Median 402 handshake	238ms
p90 handshake	408ms
Catalog price (advertised)	$1
Live price (median demanded)	$1
Price status	match
Protocol	x402 v2
Category (our classification)	other
Payment receiver	0x87F9…DBa4 · changed 1× 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
Second vantage	confirmed 402 from a second network path (Cloudflare edge), 4h ago
Discovery (.well-known/x402)	not found
Catalog volume (their metric)	13 calls/30d

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

/v1/proposal-check	$1	$1 (differs)
/v1/proposal-check/deep	$2	$2 (matches)
/v1/reaction-check	$0.5	$0.5 (matches)

grade evidence: hourly probes of /v1/proposal-check. 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)

20260814 22:34	payment receiver changed to 0x87F9…DBa4
2026-08-17 23:26	price changed $0.5 → $1
2026-08-17 19:34	price changed $1 → $0.5

Seller description of the probed product (one of 3 listed) · unverified · not part of the rating

Stress-test a product, feature, API, implementation, or business proposal before meaningful investment. ProposalCheck evaluates the core thesis, assumptions, differentiation, feasibility, economics, scope, dependencies, validation strategy, kill criteria, …

receiver-changed

Embed this grade (free, always current)

<a href="https://x402register.com/s/launchcheck-x402.fly.dev.html"><img src="https://x402register.com/badge/launchcheck-x402.fly.dev.svg" alt="x402 register grade A"></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 launchcheck-x402.fly.dev? Dispute this rating. Scores are opinions based on automated measurements at the stated times.