MENTAT

kt_a6521ffbc4232d4c35bb1be5 · Base agent #31596

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-A

Answers and conforms · 94.8 / 100

Rated 2026-10-15 21:51:16 UTC · method ur-1.0

Reachability35.0 / 35

Protocol conformance33.2 / 35

Declared vs actual16.7 / 20

Metadata10.0 / 10

Endpoints probed

Kind	Endpoint	Outcome	Conformance	Latency
a2a	https://api.mentat.market/.well-known/agent-card.json	answers HTTP 200	90%	386 ms
mcp	https://api.mentat.market/mcp	answers HTTP 200	100%	844 ms

Failed checks

a2a:echo_envelope — HTTP 405, not a JSON-RPC 2.0 response

Declared vs actual

matches registration name matches "MENTAT"
matches declared a2a service answers and conforms
matches declared mcp service answers and conforms
differs declares x402Support but no valid x402 challenge was observed at the declared endpoints

Evidence

Evidence hash: 0xe2205aabe840fc832cb875b117af62c50d5b32ce99df6aa0710c5ac83b3cd725
Rating hash: 0x9648c03d0131ff8a8abe9402e5017dbd910a156bc109cf056911a7a0e94fb0db
Full evidence: /v1/ratings/kt_a6521…1be5/evidence (JSON)
Batch: urb_20261015_002 · leaf 303 · root 0xa8bc5c7d37…51d649cd · 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 0xe6f26f05c956d1833a1daaaad57cd0a1e626bfd3 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_a6521ffbc4232d4c35bb1be5/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_a6521ffbc4232d4c35bb1be5/claim \
  -H 'content-type: application/json' -d '{"nonce":"<nonce>","signature":"0x…"}'

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

Census entry · All ratings