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 18882 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18883 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18884 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18885 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18886 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18887 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18888 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18889 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18890 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18891 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18892 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18893 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18894 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18895 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18896 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18897 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18898 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18899 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18900 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18901 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18902 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18903 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18904 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18905 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18906 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18907 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18908 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18909 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18910 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18911 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18912 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18913 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18914 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18916 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18917 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18919 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18920 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18921 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19042 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19043 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19044 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19045 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19046 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19047 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19048 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19051 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19052 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19054 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19056 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19058 | 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.