verify

Cryptographic verification of the offer-receipt extension of x402.

Cryptographic verification of the offer-receipt extension of x402. Accepts a signed offer in eip712, jws or eip191 form — either bundled as {format, payload, signature} or as payload plus a separate signature — and an optional signed receipt. Recovers the signer, compares it with the payTo of the offer, compares receipt and offer field by field and names every divergence with the value on each side, checks whether the offer has expired and whether the receipt timestamps are plausible against sta

UNRATEDDelisted

Overview

Grade?

UNRATED

0 of 30 paid calls toward a letter

Price

$0.003 per call

Paid calls

none yet

delivery unknown until someone pays

More info

Seller?

0x2880edff…771c4e5e

URL

https://x402.halowerk.com/receipt/verify

Seen

first 35 days ago · last 26 days ago

29 free handshakes

Payment

Pays through

x402

Offered on?

Base USDC

Listed on?

Base

Score, from free handshakes onlyweights 2026.09.1

UN
RATED

0.312 liveness verified, no letter

To a letter · 30 paid calls

0 of 30

Held down by liveness · gap to 1.000 is 0.688: 0.137 uncertain ? + 0.551 short ? · 0.138 to D

How the composite of 0.312 is made up, part by part
Component	Weight	Measured	Lower bound ?		Adds	Short ?	Uncertain ?
livenesscosts the most it answered at all	0.60	0.41	0.187		0.112	−0.351	−0.137
latency p95 it answered as fast as its class	0.20	0.00	0.000		0.000	−0.200	0
price stability the price stayed where it was listed	0.20	1.00	1.000		0.200	0	0
Composite	1.00		0.312	gap to 1.000 = 0.688 · 0.551 short · 0.137 uncertain	0.312	−0.551	−0.137

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

The multiplication, written out

  0.600 × 0.187   liveness       
+ 0.200 × 0.000   latency p95    
+ 0.200 × 1.000   price stability
= 0.312           → UNRATED: 28 of 30 paid calls      weights 2026.09.1 · 28 samples · seed cap_01M1A5Q95NPE4XBXX49ADZA6J9|2026-08-15T22:08:31.424Z|2026.09.1

Verify it yourselfnpx teppi-check https://x402.halowerk.com/receipt/verifycurl -s https://api.teppi.xyz/v1/trust/cap_01M1A5Q95NPE4XBXX49ADZA6J9