check-isbn-13

Call when an agent needs whether an ISBN-13 checksum is valid.

Call when an agent needs whether an ISBN-13 checksum is valid. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/check-isbn-13 first.

UNRATEDListed

Overview

Grade?

UNRATED

0 of 30 paid calls toward a letter

Price

$0.005 per call

Paid calls

none yet

delivery unknown until someone pays

More info

Seller?

0x1d61faa0…e0e55a38

URL

https://agentshelf.syntexa.ch/v1/check-isbn-13

Seen

first 10 days ago · last 4 days ago

17 free handshakes

Payment

Pays through

x402

Offered on?

Base USDC

Listed on?

Base

Score, from free handshakes onlyweights 2026.09.6

UN
RATED

0.737 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 0.263: 0.230 uncertain ? + 0.032 short ? · 0.063 to B

How the composite of 0.737 is made up, part by part
Component	Weight	Measured	Lower bound ?		Adds	Short ?	Uncertain ?
livenesscosts the most it answered at all	0.60	1.00	0.616		0.370	0	−0.230
latency p95 it answered as fast as its class	0.20	0.84	0.839		0.168	−0.032	0
price stability the price stayed where it was listed	0.20	1.00	1.000		0.200	0	0
Composite	1.00		0.737	gap to 1.000 = 0.263 · 0.032 short · 0.230 uncertain	0.737	−0.032	−0.230

Not measured: correctness · nobody paid; honesty · nobody paid; schema conformance · no answer had a published shape to check

The multiplication, written out

  0.600 × 0.616   liveness       
+ 0.200 × 0.839   latency p95    
+ 0.200 × 1.000   price stability
= 0.737           → UNRATED: 16 of 30 paid calls      weights 2026.09.6 · 16 samples · seed cap_01M38Z3N479TMX7KE182KZEHTY|2026-09-03T14:54:35.249Z|2026.09.6

Verify it yourselfnpx teppi-check https://agentshelf.syntexa.ch/v1/check-isbn-13curl -s https://api.teppi.xyz/v1/trust/cap_01M38Z3N479TMX7KE182KZEHTY