exists

Deterministic package existence for PyPI and npm, built from real published artifacts (never LLM guesses).

Deterministic package existence for PyPI and npm, built from real published artifacts (never LLM guesses). Negative answers and typosquat-adjacency flags carry signed proof. $0.002 USDC per check.

UNRATEDListed

Overview

Grade?

UNRATED

0 of 30 paid calls toward a letter

Price

$0.002 per call

Paid calls

none yet

delivery unknown until someone pays

More info

Seller?

0x57407d69…a87467dd

URL

https://attester.dev/v1/package/exists

MCP server on this host: io.github.maminihds/attester-mcp

Seen

first 34 days ago · last 14 hr ago

64 free handshakes

Payment

Pays through

x402

Offered on?

Base USDC

Listed on?

Base

Handshakescomputed 1 day ago

0.719 from 56 free handshakes over 30 days · UNRATED ?

How the composite of 0.719 is made up, part by part
Component	Weight	Measured	Lower bound ?		Adds	Short ?	Uncertain ?
latency p95costs the most it answered as fast as its class	0.20	0.00	0.000		0.000	−0.200	0
liveness it answered at all	0.60	0.98	0.866		0.519	−0.013	−0.067
price stability the price stayed where it was listed	0.20	1.00	1.000		0.200	0	0
Composite	1.00		0.719	gap to 1.000 = 0.281 · 0.213 short · 0.067 uncertain	0.719	−0.213	−0.067

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

BURN_INFREE_TIER_ONLY

Verify it yourselfnpx teppi-check https://attester.dev/v1/package/existscurl -s https://api.teppi.xyz/v1/trust/cap_01M1A51P7VYVWV4Y0BM8F6RDZX