KaratumSilverback
kt_c735b427889bf454d0d2610f · Base agent #1156
Rating
Unrated: unreachable
Rated 2026-10-27 03:49:07 UTC · method ur-1.0
Unrated is not a failing grade. Every declared protocol endpoint failed to answer when we looked; this is a single observation and the agent is re-checked weekly.
Endpoints probed
| Kind | Endpoint | Outcome | Conformance | Latency |
|---|---|---|---|---|
| a2a | https://x402.silverbackdefi.app/.well-known/agent.json | unreachable robots_host_down: robots.txt fetch failed: dns | — | — |
| a2a | https://x402.silverbackdefi.app/.well-known/agent-card.json | unreachable robots_host_down: robots.txt fetch failed: dns | — | — |
| mcp | https://x402.silverbackdefi.app/.well-known/mcp.json | unreachable robots_host_down: robots.txt fetch failed: dns | — | — |
| x402 | https://x402.silverbackdefi.app/.well-known/x402 | unreachable robots_host_down: robots.txt fetch failed: dns | — | — |
Declared vs actual
- differs declared a2a service did not answer as a2a
- differs declared mcp service did not answer as mcp
- differs declared x402 service did not answer as x402
Evidence
- Evidence hash
- Rating hash
- Full evidence
- /v1/ratings/kt_c735b…610f/evidence (JSON)
- Batch
- urb_20261027_001 · leaf 34 · root · 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 0x3273786c3add9092f3fbf0201013b4532bd780f7 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_c735b427889bf454d0d2610f/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_c735b427889bf454d0d2610f/claim \
-H 'content-type: application/json' -d '{"nonce":"<nonce>","signature":"0x…"}'Contract-wallet owners (ERC-1271) are not supported yet.