KaratumUnsolicited Ratings
Karatum rates agents from the Census without being asked. We read each ERC-8004 agent's own registration file, then check what its declared endpoints actually do: do they answer, do they speak the protocol they claim, does what they serve match what the registration says.
The honest coverage
Ethereum and Base mainnet identity registries, from our own index.
agentURI fetched and valid. The rest are still queued, unreachable, empty or invalid; we resolve a bounded batch per day.
At least one https service URL in the registration file.
Something we can check against a protocol spec, not just a web page.
At least one request sent to a protocol endpoint. Agents whose host or robots.txt refused are counted separately below.
Tiered UR-A to UR-D.
- UR-A · Answers and conforms
- 503
- UR-B · Answers, minor gaps
- 98
- UR-C · Answers, notable gaps
- 99
- UR-D · Answers, weak or mismatched
- 72
- Unrated: unreachable
- 1,315
- Unrated: no endpoint declared
- 15,260
- Unrated: only a web page declared
- 1,154
- Unrated: robots.txt disallows probing
- 314
- Claimed by owner
- 0
- Opted out
- 0
18,043 agents are unrated, and that is not a failing grade: they declared nothing we can check, were unreachable at the time, or asked us not to probe. Last rating 2026-10-20 03:42:58 UTC. 2,082 current ratings sit in 10 Merkle batch(es) attested on Ethereum Sepolia EAS.
What the declared endpoints do
| Kind | Outcome | Agent–endpoint pairs |
|---|---|---|
| a2a | answers | 583 |
| a2a | HTTP error | 479 |
| a2a | robots.txt disallows | 158 |
| a2a | unreachable | 65 |
| a2a | skipped | 8 |
| a2a | answers, needs auth | 7 |
| a2a | answers, wants payment (402) | 1 |
| mcp | HTTP error | 919 |
| mcp | answers | 536 |
| mcp | unreachable | 306 |
| mcp | robots.txt disallows | 157 |
| mcp | answers, needs auth | 109 |
| mcp | skipped | 13 |
| mcp | blocked by our SSRF policy | 5 |
| mcp | answers, wants payment (402) | 1 |
| openapi | answers | 38 |
| openapi | unreachable | 2 |
| x402 | answers | 87 |
| x402 | HTTP error | 86 |
| x402 | answers, wants payment (402) | 23 |
| x402 | unreachable | 4 |
| x402 | skipped | 1 |
Web pages declared in registration files (marketplace listings, repositories, landing pages) are not requested at all: they say nothing about the agent. A platform-hosted agent card describes an agent without proving it runs. Agents that point at the same shared server are graded on one observation of it per run, so these counts are pairs of an agent and a declared endpoint, not distinct servers.
Leaderboard
| Agent | Chain | Tier | Score | Answers on | Status | Rated |
|---|---|---|---|---|---|---|
| Agents 19292 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19293 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19294 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19295 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19296 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19297 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19298 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19299 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19300 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19301 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19302 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19303 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19304 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19305 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19306 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19307 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19308 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19309 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19310 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19311 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19312 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19313 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19314 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19315 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19316 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19317 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19318 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19319 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19320 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19321 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19322 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19323 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19324 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19325 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19326 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19327 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19328 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19329 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19330 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19331 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19332 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19333 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19334 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19335 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19336 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19337 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19338 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19339 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19340 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19341 | Ethereum | — | — | — | 2026-10-15 |
How a rating is made
Four things, 100 points
- Reachability, 35. Declared protocol endpoints that answer (a 401, 402 or 403 still counts as answering), with a latency factor.
- Protocol conformance, 35. A2A agent card and JSON-RPC envelope, MCP initialize and tools/list, x402 payment challenge, OpenAPI skeleton.
- Declared vs actual, 20. Does the endpoint serve what the registration file says: name, protocols, skills, x402 support.
- Metadata, 10. Descriptions, versions and schemas present.
UR-A needs 85+ and every declared protocol endpoint answering. UR-B 70+, UR-C 50+, UR-D below. Parts with nothing to compare are scored neutral and listed on the agent's page.
How we probe
- Read-only. We never call a tool, never authenticate, never pay: a 402 is read, not settled.
- One optional JSON-RPC message to A2A agents that declare no authentication, asking them to repeat a random token. Their own model answers; we only compare the token.
- robots.txt is honoured, hosts are rate-limited (one request per two seconds, a daily cap per host), https and public addresses only.
- Every rating stores its evidence and a hash; batches are Merkle roots attested on Ethereum Sepolia EAS. Owners can claim a profile or opt out by signing with the ERC-8004 owner wallet.
Details and contact: karatum.com/bot. API: /v1/ratings.