Should my agent depend on the MCP server io.github.nock-for-mak/x402-checker?

Verdict: allow — rich-solo — safe to depend on As of 2026-09-06T06:21:45Z: a dated observation with receipts, not a warranty.

x402 Checker (AI Nock)

io.github.nock-for-mak/x402-checker

Free check/board/name; paid bid/report 0.05, 1c fx/wx/lookups, news 0.001.

— the operator's own registry description reported

Publisher io.github.nock-for-mak · first seen 2026-08-20 · endpoint https://x402-checker.nock-for-mak.workers.dev/mcp

allow

verdict

rich-solo

cluster

ok_tools

answers

tools served

Dependency rating derived

allow
allow — alive & usable · retrieval-public ● · V3 has answer key ◐

allow — because answers ●, 43 tools legible (band A) ●, no confirmed drift in 3 probes ●; not yet checked: truth (3 attempts unverifiable, 0 disagreements)

Cluster rich-solo · distinctiveness 0.363 (moderate). Every figure is a percentile or class within the 15,472-server census — see the whole spectrum.

Does it answer? Q1 · observed

answersalive_tools

latency167 ms

vs populationtypical

protocolcurrent

authopen

Can it be used? Q4 · observed

tools43

vs populationhigh

capabilities1

harnessA

Did it hold when checked? Q3–Q4 · derived

identitysolo

servers on its host1

verifiabilityunassessed

duplicate inventoryno

drift events0

answers true0/0 agree

🔏 Signed receipt rr_3906702e1eaa6f380ad25d62 · ed25519 · key rs-rcpt-2026-08 — this rating is tamper-evident; an agent gets the full signature from check_server and can verify it against the published key.

Q1Does it answer?alive & usable — 3 probes ●evidence ↓

Q2What is it?retrieval-public ● evidence ↓

Q3Can it be checked?V3 has answer key ◐evidence ↓

Q4Did it hold?harness A · truth not yet run · no drift ●evidence ↓

Q5What company does it keep?rich-solo · 1 on its host (context, not verdict) ◐evidence ↓

● observed · ◐ derived · ○ reported — the verdict synthesizes Q1–Q4; Q5 is context. Methodology →

History observed

Every probe we made, oldest → newest (3 shown, 2026-08-23 → 2026-09-06). Green answered · amber answered-but-walled · red no useful answer. A gap in our cadence is a gap in coverage, not evidence about the server.

changelog (2 events)

date	type	what changed
2026-08-30	inventory	tools 12 → 43
2026-08-23	outcome	first probe: ok_tools

What kind of tools these are derived

Verification only means something relative to a tool's NATURE — an email-sender has no "true answer", a generator has no answer key. Classification evidence: classified from tool names/descriptions/annotations WE OBSERVED. What checking applies to each kind (the full methodology →):

nature	tools	meaning	what checking applies
retrieval-public	37	serves public facts	truth-checkable against a public source — the V-ladder applies in full
computational	4	deterministic transforms	self-checkable by re-computation and known-answer tests
action	2	changes the world	no true answer exists; we check the CONTRACT (destructive/read-only/idempotent declarations, error legibility) and never fire real actions

Tools last seen observed

arxiv bid bizdays block board check check_batch cron crypto_news cve dex domain email ens find fng fx gas geo gh headers hn json md name_lookup name_register now pm price quote redirect report sanctions sig so ssl token tsec tx tz who wiki wx

Harness readiness observed

Can an agent's harness pick this tool and call it correctly? Graded on the three things an agent reads — name, description, typed parameters. Band A — an agent can pick and call these reliably.

legibility check	tools passing	ok
name is clear & specific	34/43	34/43
has a description	43/43	✓
description is substantive	43/43	✓
parameters are typed	42/43	42/43
parameters are described	43/43	✓

43 of 43 tools graded · 43 with a captured input schema. RS-008, Tier-1 — no domain knowledge, applies to any tool. “Alive” is not the same as “usable”.

Truth checks observed

Not yet confirmed — 3 attempt(s) currently unverifiable (rate limits, walls, or unmappable schemas — never counted against the server) · 0 disagreements.

claim class	key	verdict	primary source
OFAC SDN screening (vs the official list)	ISLAMIC REVOLUTIONARY GUARD CORPS	unverifiable	ofac-sdn
OFAC SDN screening (vs the official list)	MAERSK LINE	unverifiable	ofac-sdn
OFAC SDN screening (vs the official list)	unmapped	unverifiable	ofac-sdn

Protocol conformance observed

2025-06-18

protocol version

—

session model

1.41.0

server version x402-checker

Capabilities: tools

Drift observed

No confirmed drift on record. Baseline set 2026-09-06; changes appear here after human review.

raw probe records

probed (UTC)	outcome	http	ms	protocol
2026-09-06T06:16:43Z	ok_tools	200	167	2025-06-18
2026-08-30T06:16:31Z	ok_tools	200	42	2025-06-18
2026-08-23T06:14:00Z	ok_tools	200	68	2025-06-18

Watch or embed this verdict

Operators: put the live verdict in your README — it updates with every census, links back here, and is a dated observation, never a warranty:

[![Robin Saige verdict](https://robinsaige.com/badge/io.github.nock-for-mak/x402-checker.svg)](https://robinsaige.com/s/io.github.nock-for-mak/x402-checker)

Depend on it? Subscribe to its change feed — outcome changes and confirmed drift, no account needed. Building on it? The full dossier as JSON — verdict, rating, truth checks, history — stable enough to gate CI on.

← overview

Operator of this server? Everything we hold about it is on this page — free, no account, for anyone. Wrong attribution, stale probe, misclassification? Dispute this record →