http-header-checker.underscoredone.com

92.5 / 100 · rank 1064 of 1555

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

Availability83

Latency100

Price integrity100

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 61 probes · single vantage
Median 402 handshake	191ms
p90 handshake	202ms
Catalog price (advertised)	$0.01
Live price (median demanded)	$0.01
Price status	match
Protocol	x402 v2
Category (our classification)	other
Payment receiver	0xE974…2F08 (+1 more) · stable 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
Discovery (.well-known/x402)	not found
Catalog volume (their metric)	1 calls/30d

Seller-provided description · unverified · not part of the rating

Sends a request to a web address you provide and reports back everything the server said in response: the status code, all the response headers, how many times it got redirected, and how long the whole thing took.

Embed this grade (free, always current)

<a href="https://x402register.com/s/http-header-checker.underscoredone.com.html"><img src="https://x402register.com/badge/http-header-checker.underscoredone.com.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, from a single network vantage for this service.

Operator of http-header-checker.underscoredone.com? Dispute this rating. Scores are opinions based on automated measurements at the stated times.