kairostamp.com

82.4 / 100 · rank 1503 of 1587

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

Latency54

Price integrity84

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 62 probes
Median 402 handshake	1234ms
p90 handshake	1656ms
Catalog price (advertised)	$0.001
Live price (median demanded)	$0.01
Price status	match
Protocol	x402 v2
Category (our classification)	finance-crypto
Payment receiver	0xdB6F…8453 · changed 2× since Jul 12
Base USDC settlement to this receiver wallet (30d' measured by us)	x402-plausible (amount matches a listed price): $0 · 10 transfers · 2 distinct senders. All USDC inflow' upper bound incl. non-x402: $0 · 10 transfers.
Second vantage	confirmed 402 from a second network path (Cloudflare edge), 1h ago
Discovery (.well-known/x402)	not found
Catalog volume (their metric)	1 calls/30d

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

/api/v1/change-check	$0.01	$0.05 (differs)
/api/v1/link-map	$0.002	$0.015 (differs)
/api/v1/robots-check	$0.001	$0.001 (matches)
/api/v1/sitemap	$0.002	$0.002 (matches)
/api/v1/snapshot	$0.01	$0.01 (matches)
/api/v1/digest	$0.002	not yet probed
/api/v1/headers	$0.001	not yet probed
/api/v1/redirect-audit	$0.001	not yet probed
/api/v1/text-extract	$0.003	not yet probed
/api/v1/verify	$0.001	not yet probed

grade evidence: hourly probes of /api/v1/verify. 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)

20260823 10:34	payment receiver changed to 0xdB6F…8453
20260823 04:34	payment receiver changed to 0x3584…0496, 0xdB6F…8453
2026-08-23 15:36	price changed $0.001 → $0.005
2026-08-23 11:36	price changed $0.01 → $0.001

Seller description of the probed product (one of 10 listed) · unverified · not part of the rating

Receipt verification: read-only hash-chain verification of one existing Kairostamp receipt id. Recomputes the canonical SHA-256 digest, compares it with the stored chain hash, checks linkage to the preceding entry and reports whether the entry is covered …

receiver-changed

Embed this grade (free, always current)

<a href="https://x402register.com/s/kairostamp.com.html"><img src="https://x402register.com/badge/kairostamp.com.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 kairostamp.com? Dispute this rating. Scores are opinions based on automated measurements at the stated times.