Endpoint · computeGETapi.sitecheck-api.workers.dev /api/validate ?type=isbn&value=0306406152
Checks the check digit and structure of an identifier with no network call: ISBN-10 and ISBN-13 (with ISBN-10 to 13 conversion), EAN-8, UPC-A, EAN-13 and GTIN-14 (with the GS1…
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Checks the check digit and structure of an identifier with no network call: ISBN-10 and ISBN-13 (with ISBN-10 to 13 conversion), EAN-8, UPC-A, EAN-13 and GTIN-14 (with the GS1 prefix country), VIN (manufacturer code, region, model year), IMEI, ISIN (country) and a generic Luhn number. type=auto detects the type. Up to 50 comma-separated values give a results array.Overview
Grade?
UNRATED
0 of 30 paid calls toward a letter
Price
$0.001 per call
Paid calls
none yet
delivery unknown until someone pays
More info
Seller?
URL
https://api.sitecheck-api.workers.dev/api/validate?type=isbn&value=0306406152
MCP server on this host: io.github.bck-stack/sitecheck
Seen
first 9 days ago · last 17 hr ago
9 free handshakes
Payment
Pays through
x402
Offered on?
Arc, Base USDC, Solana, xrpl:0
Listed on?
Base, Solana
Score, from free handshakes onlyweights 2026.09.6
UN
RATED
RATED
0.591 liveness verified, no letter
To a letter · 30 paid calls
0 of 30
Held back by sample size, not by the seller · gap to 1.000 is 0.409: 0.409 uncertain ? + 0.000 short ? · 0.059 to C
| Component | Weight | Measured | Lower bound ? | Adds | Short ? | Uncertain ? | |
|---|---|---|---|---|---|---|---|
| livenesscosts the most it answered at all |
0.60 | 1.00 | 0.318 | 0.191 | 0 | −0.409 | |
| latency p95 it answered as fast as its class |
0.20 | 1.00 | 1.000 | 0.200 | 0 | 0 | |
| price stability the price stayed where it was listed |
0.20 | 1.00 | 1.000 | 0.200 | 0 | 0 | |
| Composite | 1.00 | 0.591 | gap to 1.000 = 0.409 · 0.000 short · 0.409 uncertain | 0.591 | −0.000 | −0.409 |
Not measured: correctness · nobody paid; honesty · nobody paid; schema conformance · no answer had a published shape to check
The multiplication, written out
0.600 × 0.318 liveness
+ 0.200 × 1.000 latency p95
+ 0.200 × 1.000 price stability
= 0.591 → UNRATED: 9 of 30 paid calls weights 2026.09.6 · 9 samples · seed cap_01M4WF5CZ10HHWTCVD3MX5P9JX|2026-09-23T03:00:47.566Z|2026.09.6
Verify it yourself
npx teppi-check https://api.sitecheck-api.workers.dev/api/validate?type=isbn&value=0306406152curl -s https://api.teppi.xyz/v1/trust/cap_01M4WF5CZ10HHWTCVD3MX5P9JX