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The dataset generation failed
Error code:   DatasetGenerationError
Exception:    CastError
Message:      Couldn't cast
agent_id: int64
chain: string
chain_id: int64
plan_rank: int64
reason: string
state: string
total_feedbacks_8004scan: int64
uri: string
uri_len: int64
uri_scheme: string
uri_sha256: string
service_names: string
declared: string
n_services: int64
name: string
reg_type: string
services_field: string
x402support: bool
content_sha256: string
content_type: string
http_status: int64
to
{'agent_id': Value('int64'), 'chain': Value('string'), 'chain_id': Value('int64'), 'plan_rank': Value('int64'), 'state': Value('string'), 'total_feedbacks_8004scan': Value('int64'), 'uri': Value('string'), 'uri_len': Value('int64'), 'uri_scheme': Value('string'), 'uri_sha256': Value('string'), 'service_names': Json(decode=True), 'declared': Json(decode=True), 'n_services': Value('int64'), 'name': Value('string'), 'reg_type': Value('string'), 'services_field': Value('string'), 'x402support': Value('bool'), 'reason': Value('string')}
because column names don't match
Traceback:    Traceback (most recent call last):
                File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1827, in _prepare_split_single
                  for key, table in generator:
                                    ^^^^^^^^^
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 613, in wrapped
                  for item in generator(*args, **kwargs):
                              ~~~~~~~~~^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/json/json.py", line 343, in _generate_tables
                  self._cast_table(pa_table, json_field_paths=json_field_paths),
                  ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/json/json.py", line 132, in _cast_table
                  pa_table = table_cast(pa_table, self.info.features.arrow_schema)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2378, in table_cast
                  return cast_table_to_schema(table, schema)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2306, in cast_table_to_schema
                  raise CastError(
                  ...<3 lines>...
                  )
              datasets.table.CastError: Couldn't cast
              agent_id: int64
              chain: string
              chain_id: int64
              plan_rank: int64
              reason: string
              state: string
              total_feedbacks_8004scan: int64
              uri: string
              uri_len: int64
              uri_scheme: string
              uri_sha256: string
              service_names: string
              declared: string
              n_services: int64
              name: string
              reg_type: string
              services_field: string
              x402support: bool
              content_sha256: string
              content_type: string
              http_status: int64
              to
              {'agent_id': Value('int64'), 'chain': Value('string'), 'chain_id': Value('int64'), 'plan_rank': Value('int64'), 'state': Value('string'), 'total_feedbacks_8004scan': Value('int64'), 'uri': Value('string'), 'uri_len': Value('int64'), 'uri_scheme': Value('string'), 'uri_sha256': Value('string'), 'service_names': Json(decode=True), 'declared': Json(decode=True), 'n_services': Value('int64'), 'name': Value('string'), 'reg_type': Value('string'), 'services_field': Value('string'), 'x402support': Value('bool'), 'reason': Value('string')}
              because column names don't match
              
              The above exception was the direct cause of the following exception:
              
              Traceback (most recent call last):
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 1369, in compute_config_parquet_and_info_response
                  parquet_operations, partial, estimated_dataset_info = stream_convert_to_parquet(
                                                                        ~~~~~~~~~~~~~~~~~~~~~~~~~^
                      builder, max_dataset_size_bytes=max_dataset_size_bytes
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                  )
                  ^
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 948, in stream_convert_to_parquet
                  builder._prepare_split(split_generator=splits_generators[split], file_format="parquet")
                  ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1694, in _prepare_split
                  for job_id, done, content in self._prepare_split_single(
                                               ~~~~~~~~~~~~~~~~~~~~~~~~~~^
                      gen_kwargs=gen_kwargs, job_id=job_id, **_prepare_split_args
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                  ):
                  ^
                File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1880, in _prepare_split_single
                  raise DatasetGenerationError("An error occurred while generating the dataset") from e
              datasets.exceptions.DatasetGenerationError: An error occurred while generating the dataset

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agent_id
int64
chain
string
chain_id
int64
plan_rank
int64
state
string
total_feedbacks_8004scan
int64
uri
string
uri_len
int64
uri_scheme
string
uri_sha256
string
service_names
unknown
declared
unknown
n_services
int64
name
string
reg_type
string
services_field
string
x402support
bool
reason
string
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null
null
null
null
null
null
null
null
70
ethereum
1
12,060
NO_URI
0
0
empty
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null
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71
ethereum
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12,061
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72
ethereum
1
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null
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null
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73
ethereum
1
12,063
NO_URI
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0
empty
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null
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null
null
null
null
null
null
74
ethereum
1
12,064
NO_URI
0
0
empty
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
null
null
null
null
null
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75
ethereum
1
12,065
NO_URI
0
0
empty
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null
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null
null
null
null
null
null
76
ethereum
1
12,066
NO_URI
0
0
empty
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null
null
null
null
null
null
null
null
77
ethereum
1
12,067
NO_URI
0
0
empty
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
null
null
null
null
null
null
null
null
78
ethereum
1
12,068
NO_URI
0
0
empty
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
null
null
null
null
null
null
null
null
79
ethereum
1
12,069
NO_URI
0
0
empty
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
null
null
null
null
null
null
null
null
80
ethereum
1
12,070
NO_URI
0
0
empty
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
null
null
null
null
null
null
null
null
81
ethereum
1
12,071
NO_URI
0
0
empty
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
null
null
null
null
null
null
null
null
82
ethereum
1
12,072
NO_URI
0
0
empty
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null
null
null
null
null
null
null
null
83
ethereum
1
12,073
NO_URI
0
0
empty
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
null
null
null
null
null
null
null
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84
ethereum
1
12,074
NO_URI
0
0
empty
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null
null
null
null
null
null
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85
ethereum
1
12,075
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0
empty
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null
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86
ethereum
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12,076
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0
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ethereum
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12,077
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ethereum
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12,078
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null
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12,079
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ethereum
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12,080
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ethereum
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12,081
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null
null
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null
null
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ethereum
1
12,082
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0
empty
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null
null
null
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ethereum
1
12,083
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ethereum
1
12,086
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null
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97
ethereum
1
12,087
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98
ethereum
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12,088
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ethereum
1
12,089
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End of preview.

ERC-8004 agent census - measured read, 2026-09-26

Every agent id in the ERC-8004 Identity Registry (0x8004A169FB4a3325136EB29fA0ceB6D2e539a432) on Ethereum, Base and BNB Smart Chain, read with eth_call only (no transaction, no key), each with exactly one state. Published by CSOAI Ltd (Council of AI, https://councilof.ai). We measure; we do not certify, grade, rank or endorse any agent. Contact, objections and re-checks: nicholas@csoai.org (see below).

Read state: PARTIAL. Why:

  • the agentURI of EVERY agent id 0..max on the three chains was read on-chain (EXHAUSTED at that level)
  • off-chain registration files were fetched only for the top-20% plan, and not all of the plan within the fetch budget (NOT_FETCHED, counted)
  • 8004scan's reach listing is capped at offset 10000 (Base truncated: agents with feedback beyond it are ordered by chain order)
  • BSC was read at 'latest' across a block window, not at one pinned block (see limits)

Record record.json sha256 60bd9728f22159351feb71ccd6e0c01faab582f0ccf661415e36f339e52d2538, signed (Ed25519, did:web:csoai.org#board-attestation-1) at 2026-09-26T05:31:49.737Z; OpenTimestamps PENDING_CALENDAR_COMMITMENT at staging (a calendar commitment, not a Bitcoin attestation).

chain agent ids read read at
ethereum 51,458 finalized block 26,058,367
base 95,776 finalized block 51,798,319
bsc 358,401 block tag latest across blocks 124,057,093 to 124,061,273 (a window, not one block; see Limits)
state agents
DECLARES_ENDPOINT 13,210
NO_ENDPOINT 187,513
INVALID_JSON 2,205
URI_UNREACHABLE 13,788
NO_URI 52,469
URI_UNSUPPORTED_SCHEME 5,436
TOKEN_REVERTED 0
NOT_FETCHED 231,014

DECLARES_ENDPOINT = a registration JSON object with a services entry named MCP, A2A or web whose endpoint is http(s). NOT_FETCHED (231,014) = a registration file that was not fetched: outside the top-20% plan, or refused by robots.txt, a 429, or a non-public address. It is unmeasured, not absent.

Plan: top ceil(0.2*N) agents: 8004scan total_feedbacks > 0 first (desc), ties and zero-feedback agents in chain order ethereum, base, bsc, then agent id ascending; 101,127 agents, 11,989 of them by 8004scan feedback.

Declared endpoints probed (discovery only)

  • MCP: PARTIAL. 2,113 attempted of 2,144 planned (31 not attempted: robots.txt HTTP n: treated as disallow-all (RFC 9309 server error; 429 = slow down) 15; robots.txt disallows this path for CSOAI-census 16). States: RESPONDED 580, AUTH_REQUIRED 32, MCP_ERROR 2, SSE_ENDPOINT_ONLY 3, NOT_MCP 1,092, UNREACHABLE 393, TIMEOUT 11. Sent: robots.txt, server/discover or initialize, tools/list; never tools/call, any credential or any payment.
  • A2A agent cards: EXHAUSTED in the prober's own sense (every planned card URL has an outcome): 4,389 of 4,389. Not every one was requested: ROBOTS_DISALLOWED 26 and HF_SPACE_NOT_CONTACTED 1 are outcomes without a request. States: CARD_SERVED 886, CARD_INVALID 16, AUTH_REQUIRED 6, NOT_FOUND 3,407, UNREACHABLE 36, TIMEOUT 11, HF_SPACE_NOT_CONTACTED 1, ROBOTS_DISALLOWED 26. Sent: GET of the agent card only; never message/send or any task.
  • Distinct endpoints declared: MCP 2,152, A2A 4,399. Declared but not planned (never requested): MCP - not an endpoint URL: unparseable host 1, rights gate MEASURE_PUBLIC RESTRICTED: templated endpoint: needs a caller-supplied value 1, rights gate MEASURE_PUBLIC RESTRICTED: advertised address is not public (loopback/private/local) 7; A2A - rights gate MEASURE_PUBLIC RESTRICTED: templated endpoint: needs a caller-supplied value 4, rights gate MEASURE_PUBLIC RESTRICTED: advertised address is not public (loopback/private/local) 6.

Limits

  • BSC was read at block tag 'latest' across a block WINDOW (window_start .. window_end in chains.bsc.pinned_block), not at one pinned finalized block: both keyless BSC RPCs refused eth_call against a numbered block (rpc-bsc.48.club: 'not supported'; bsc-rpc.publicnode.com: HTTP 403), measured 2026-09-26. Agents registered or re-pointed during the window may be read either side of the change.
  • Ethereum and Base were read at one finalized block (number AND hash recorded).
  • 8004scan offset cap: Base agents with feedback beyond offset 10000 are ordered by chain order, not by feedback.
  • IPFS registration files were fetched only through gateway.pinata.cloud (ipfs.io and dweb.link answered 429 to a single request); a gateway failure is URI_UNREACHABLE, not proof the CID is gone.
  • rpc.flashbots.net answered HTTP 403 and was not used; mainnet.base.org was used alongside Tenderly for Base after it matched the pinned block hash.
  • fetch.requests is a LOWER BOUND: the fetcher's request counter was updated from 48 threads without a lock, so increments can be lost; per-row outcomes are exact.
  • ipfs.io (listed directly as an https host by thousands of agents) answered 429 after one retry and was stopped for the run: those rows are NOT_FETCHED, not unreachable.
  • POLITENESS INCIDENT: from 2026-09-26T02:31:28Z to about 03:02Z TWO copies of the classifier/fetcher ran at once (one started by a finisher script, one by this lane's agent), each with its own per-host gate. During that window a registration host could receive up to 2 requests/s instead of <= 1, and some registration files were fetched twice. The agent's copy was stopped at about 03:02Z (SIGTERM); the rows here are from the copy that ran to completion. No endpoint probe (MCP/A2A) was affected.

Not evidence of

  • that any agent is safe, honest, active, owned by who it names, or does what its registration says
  • endorsement, ranking, grading or approval of any agent or operator
  • anything about agents on other chains or other registries
  • a count of distinct operators (ids are not operators)

Files

file rows sha256
record.json - 60bd9728f22159351feb71ccd6e0c01faab582f0ccf661415e36f339e52d2538
agents.jsonl.gz 505,635 eafd6b18313df16a139114347f136afc527d7c349f01e7c348a436657e9b6995
probe-mcp.jsonl.gz - 16b4d82f02a5570ba95589238f2b7e862be1ca6bd5712d11088f818fc9223a35
probe-a2a.jsonl.gz - 2e9803edb9fa69ccfced7da563f9373ea135b0ec6d40d355bf05b01c1f27239f
declared-mcp.jsonl.gz - 03cc39fdee2e6a88918fce7b0aae25abe1029eab81dbc4d2d9c6b0a0c9df5fa8
declared-a2a.jsonl.gz - 58124a58de5c4926129404e053b089bab75296319512aaae2955190b21dec363

record.signed.json (signature), record.json.ots (OpenTimestamps proof), record.ots.json (its stated state), SHA256SUMS (every file above).

How to verify

Signature. In record.signed.json, serialise payload as JSON with keys sorted recursively, no whitespace, UTF-8. Its sha256 must equal signature.payload_sha256, and payload.artifact.sha256 must equal the sha256 of record.json. Verify signature.sig_ed25519 (hex) over those bytes with the Ed25519 key #board-attestation-1 in https://csoai.org/.well-known/did.json. Fetch it with a named User-Agent: the default Python-urllib one is refused (403).

import json, hashlib, base64, urllib.request
from cryptography.hazmat.primitives.asymmetric import ed25519
s = json.load(open("record.signed.json"))
c = json.dumps(s["payload"], sort_keys=True, separators=(",", ":"), ensure_ascii=False).encode()
assert hashlib.sha256(c).hexdigest() == s["signature"]["payload_sha256"]
assert hashlib.sha256(open("record.json", "rb").read()).hexdigest() == s["payload"]["artifact"]["sha256"]
req = urllib.request.Request("https://csoai.org/.well-known/did.json", headers={"User-Agent": "erc8004-agent-census-verify/0.1 (+https://councilof.ai/contact)"})
did = json.load(urllib.request.urlopen(req, timeout=30))
x = [m for m in did["verificationMethod"] if m["id"].endswith("#board-attestation-1")][0]["publicKeyJwk"]["x"]
ed25519.Ed25519PublicKey.from_public_bytes(base64.urlsafe_b64decode(x + "==")).verify(bytes.fromhex(s["signature"]["sig_ed25519"]), c)
print("VERIFIES record.json")

Files. sha256sum -c SHA256SUMS. Timestamp. pip install opentimestamps-client, then ots upgrade record.json.ots and ots verify record.json.ots; until an upgrade returns a Bitcoin block attestation the proof is a pending calendar commitment and proves nothing about time.

Contact, objections and re-checks

Publisher and accountable entity: CSOAI Ltd (Council of AI, https://councilof.ai). Contact: nicholas@csoai.org (also https://councilof.ai/contact).

  • Object to a row, or ask for a re-check. If you control an agent id or an endpoint listed here and think its state is wrong, out of date, or should not be published, email nicholas@csoai.org with the chain and agent id (or the endpoint URL). We re-read it with the same read-only tools and reply with what we saw. If the published state was wrong, the correction is published here as a new file and listed under Corrections; published files are never edited in place. A re-check reports one read at one moment; it is not a grade.
  • Opt out of future fetches and probes. Registration-file fetches and endpoint probes send the User-Agent CSOAI-census/0.1 (+https://councilof.ai/census) and honour robots.txt for the token CSOAI-census: a disallowed path is recorded NOT_FETCHED or NOT_ATTEMPTED and is not requested. A Disallow for CSOAI-census is enough; you can also email us. On-chain reads (eth_call against public RPCs) read the public registry and contact no agent.
  • Corrections. Published in a Corrections section of this card and at https://councilof.ai/corrections. A superseding record never rewrites the earlier one. None so far.

Licence

Data: CC-BY-4.0. Cite as: CSOAI Ltd (Council of AI), ERC-8004 agent census, measured read 2026-09-26, csoai/erc8004-agent-census, record.json sha256 60bd9728f22159351feb71ccd6e0c01faab582f0ccf661415e36f339e52d2538.

Provenance

record.json was built by erc8004_record.py sha256 d481a6d3c49f78ea7ef1e3944926f1bc034dc61363279e980140e838ffde7310 (named in the record's producer). This card was written at staging by the same script's stage step, sha256 bdde522903151f3177050ce93ea82b31cfecd77748a48c2887f8ddf3b3d48bf0; the stage step changes only this card, SHA256SUMS and the publish script.

How to cite

CSOAI Ltd (Council of AI). ERC-8004 agent census (measured read, 2026-09-26). 2026. Hugging Face dataset csoai/erc8004-agent-census. https://huggingface.co/datasets/csoai/erc8004-agent-census

@misc{csoai_erc8004_agent_census,
  title        = {ERC-8004 agent census (measured read, 2026-09-26)},
  author       = {{CSOAI Ltd}},
  year         = {2026},
  howpublished = {Hugging Face dataset, https://huggingface.co/datasets/csoai/erc8004-agent-census},
  note         = {Corrections: https://councilof.ai/api/corrections}
}

Licence: CC-BY-4.0. Attribute Council of AI, CSOAI Ltd (16939677), https://councilof.ai.

Corrections and verification

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