X402/REGISTER
B

api.builtwith.com

89.9 / 100 · rank 1249 of 1544
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
Latency82
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 62 probes
Median 402 handshake468ms
p90 handshake686ms
Catalog price (advertised)$0.0495
Live price (median demanded)$0.0495
Price statusmatch
Protocolx402 v2
Category (our classification)data-intel
Payment receiver0x1937…6C94 · stable since Jul 12
Base USDC settlement to this receiver wallet (30d' measured by us)x402-plausible (amount matches a listed price): $0 · 3 transfers · 1 distinct senders. All USDC inflow' upper bound incl. non-x402: $0 · 3 transfers.
Second vantageconfirmed 402 from a second network path (Cloudflare edge), just now
Discovery (.well-known/x402)present
Catalog volume (their metric)6 calls/30d

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

/agent/ask$0.0495$0.0495 (matches)
/agent/company-domains$0.0495$0.0495 (matches)
/agent/company-identifiers$0.0495$0.0495 (matches)
/agent/keywords$0.0495$0.0495 (matches)
/agent/redirects$0.0495$0.0495 (matches)
/agent/relationships$0.0495$0.0495 (matches)
/agent/tags$0.0495$0.0495 (matches)
/agent/trust$0.0495$0.0495 (matches)
/agent/changes$0.0495not yet probed
/agent/domain$0.0495not yet probed

and 2 more listed paths

grade evidence: hourly probes of /agent/domain. 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.

Seller description of the probed product (one of 12 listed) · unverified · not part of the rating

Return BuiltWith technology detections and metadata for one domain. Useful for company research, stack analysis, competitive intelligence, and sales qualification.

Embed this grade (free, always current)
x402 register grade B
<a href="https://x402register.com/s/api.builtwith.com.html"><img src="https://x402register.com/badge/api.builtwith.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 api.builtwith.com? Dispute this rating. Scores are opinions based on automated measurements at the stated times.