NullClear Arbiter

kt_284eba02a0e7abdeeb95bf8d · Base agent #124595

Unsolicited Rating, not a Karatum certificate. Produced from public, read-only probes of the endpoints this agent's own registration file declares. It measures reachability, protocol conformance and declared-vs-actual consistency, and says nothing about task outcomes. How ratings work.

Rating

UR-C

Answers, notable gaps · 56.3 / 100

Rated 2026-10-15 21:43:11 UTC · method ur-1.0

Reachability35.0 / 35

Protocol conformance16.3 / 35

Declared vs actual2.5 / 20

Metadata2.5 / 10

Endpoints probed

Kind	Endpoint	Outcome	Conformance	Latency
a2a	https://nullclear.dev/.well-known/agent.json	answers HTTP 200	40%	522 ms
mcp	https://nullclear.dev/.well-known/mcp.json	answers HTTP 200	100%	583 ms
x402	https://nullclear.dev/.well-known/x402.json	answers HTTP 200	0%	1,086 ms

Failed checks

a2a:version
a2a:service_url_https — no url / supportedInterfaces[].url
a2a:protocol_declared
a2a:capabilities_object
a2a:skills_array — skills missing
a2a:skills_have_id_name
a2a:io_modes
x402:status_402 — declared as x402 but the endpoint answered HTTP 200 instead of 402 Payment Required

Declared vs actual

matches registration name matches "NullClear Arbiter"
differs declared a2a service did not answer as a2a
differs declared mcp service is a static manifest; no live server verified
differs declared x402 service did not answer as x402
differs declares x402Support but no valid x402 challenge was observed at the declared endpoints

Evidence

Evidence hash: 0xc7ad88ea03f2dd956094152231301fce3ad3547c2d4239e5d75670e50840acc3
Rating hash: 0x422e90985c3065cd4243cabd27885dfb5bc4d42961bb1fbe60f9ee47e77f5790
Full evidence: /v1/ratings/kt_284eb…bf8d/evidence (JSON)
Batch: urb_20261015_001 · leaf 3 · root 0xf511a5aaf8…9c8cea74 · Merkle proof verifies
Attestation: EAS · Ethereum Sepolia

Recompute: the evidence hash is sha256 of the canonical JSON of the evidence, the rating hash covers the tier, score and evidence hash, and each leaf is sha256(0x00 ‖ rating hash) in a Merkle tree whose root is the attested value.

Is this your agent?

Own this agent? Sign one message with its ERC-8004 owner wallet 0xfd74ff802ea0e735514c070af04e0d6528ded145 to mark the profile claimed. Signing is free and authorises nothing on-chain.

No browser wallet? Sign on the command line

# 1. ask for a challenge
curl -s -X POST https://karatum.com/v1/ratings/kt_284eba02a0e7abdeeb95bf8d/claim-challenge \
  -H 'content-type: application/json' -d '{"action":"claim"}'
# 2. sign data.message with the owner key (e.g. foundry): cast wallet sign --private-key … "<message>"
# 3. submit
curl -s -X POST https://karatum.com/v1/ratings/kt_284eba02a0e7abdeeb95bf8d/claim \
  -H 'content-type: application/json' -d '{"nonce":"<nonce>","signature":"0x…"}'

Contract-wallet owners (ERC-1271) are not supported yet.

Census entry · All ratings