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
- 504
- UR-B · Answers, minor gaps
- 98
- UR-C · Answers, notable gaps
- 99
- UR-D · Answers, weak or mismatched
- 72
- Unrated: unreachable
- 1,328
- Unrated: no endpoint declared
- 15,261
- Unrated: only a web page declared
- 1,154
- Unrated: robots.txt disallows probing
- 319
- Claimed by owner
- 0
- Opted out
- 0
18,062 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 2026-10-21 03:47:42 UTC. 2,096 current ratings sit in 11 Merkle batch(es) attested on Ethereum Sepolia EAS.
What the declared endpoints do
| Kind | Outcome | Agent–endpoint pairs |
|---|---|---|
| a2a | answers | 584 |
| a2a | HTTP error | 492 |
| a2a | robots.txt disallows | 163 |
| a2a | unreachable | 65 |
| a2a | skipped | 8 |
| a2a | answers, needs auth | 7 |
| a2a | answers, wants payment (402) | 1 |
| mcp | HTTP error | 932 |
| mcp | answers | 537 |
| 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 19546 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19547 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19548 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19549 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19550 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19551 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19552 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19553 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19554 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19555 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19556 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19557 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19558 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19559 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19560 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19561 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19562 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19563 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19564 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19565 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19566 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19567 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19568 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19569 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19570 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19571 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19624 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19625 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19626 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19628 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19629 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19631 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19632 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19633 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19634 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19635 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19636 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19637 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19638 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19639 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19640 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19641 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19643 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19702 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19703 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19704 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19705 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19706 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19707 | Ethereum | — | — | — | 2026-10-15 | |
| Agents 19708 | 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.