gs1?value=5901234123457

Validate and convert GS1 identifiers: GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN-13), GTIN-14, GLN and SSCC.

Validate and convert GS1 identifiers: GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN-13), GTIN-14, GLN and SSCC. Returns the check-digit verdict, the computed correct check digit, the GTIN-14 form with its indicator digit, and conversion between GTIN-8, GTIN-12, GTIN-13 and GTIN-14. No company-prefix split is returned: GS1's prefix-length table is no longer public data. Also computes a missing check digit from a partial code. Structure only, no product database.

UNRATEDListed

Overview

Grade?

UNRATED

0 of 30 paid calls toward a letter

Price

$0.05 per call

Paid calls

none yet

delivery unknown until someone pays

More info

Seller?

0xcd673f7e…9c6b3a39

URL

https://api.duoleads.com/v1/id/gs1?value=5901234123457

MCP server on this host: com.duoleads.api/data-utilities

Seen

first 5 days ago · last 15 hr ago

8 free handshakes

Payment

Pays through

x402

Offered on?

Base USDC

Listed on?

Base

Score, from free handshakes onlyweights 2026.09.6

UN
RATED

0.540 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 0.460: 0.460 uncertain ? + 0.000 short ? · 0.110 to C

How the composite of 0.540 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	0.233		0.140	0	−0.460
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		0.540	gap to 1.000 = 0.460 · 0.000 short · 0.460 uncertain	0.540	−0.000	−0.460

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

The multiplication, written out

  0.600 × 0.233   liveness       
+ 0.200 × 1.000   latency p95    
+ 0.200 × 1.000   price stability
= 0.540           → UNRATED: 8 of 30 paid calls      weights 2026.09.6 · 8 samples · seed cap_01M3NV250RTRYR6ZPWKKFPHEFZ|2026-09-04T02:59:10.018Z|2026.09.6

Verify it yourselfnpx teppi-check https://api.duoleads.com/v1/id/gs1?value=5901234123457curl -s https://api.teppi.xyz/v1/trust/cap_01M3NV250RTRYR6ZPWKKFPHEFZ