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 18832 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18833 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18834 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18835 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18836 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18837 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18838 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18839 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18840 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18841 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18842 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18843 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18844 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18845 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18846 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18847 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18848 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18849 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18850 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18851 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18852 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18853 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18854 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18855 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18856 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18857 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18858 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18859 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18860 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18861 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18862 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18863 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18864 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18865 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18866 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18867 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18868 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18869 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18870 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18871 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18872 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18873 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18874 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18875 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18876 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18877 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18878 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18879 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18880 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 18881 | 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.