{"uid":"cap_c1d7UsgN2AhLXKpqiUAiX","slug":"council-of-ai-population-layer-0-slice-15fa365f","name":"Council of AI — Population Layer 0 Slice","description":"We measure how AI systems behave against frozen, published tests and publish checkable evidence. Issued measurement cards are signed; unsigned supporting runs are labelled. Read the live board and corrections ledger.","url":"https://councilof.ai/api/pop/layer0?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"n":29,"id":"layer0","kind":"slice","rows":"<the population rows / artifact bytes, verbatim>","as_of":"2026-09-03T05:10:26Z","state":"MEASURED","n_unit":"live probes of the estate's machine surface in the ceremony","schema":"csoai.population-door/0.1","settle":{"payer":"<0x… or null>","network":"<caip2 or null>","transaction":"<0x… or null>"},"source":["/interop/layer0-ceremony-2026-09-03.json","/interop/ots/manifest.json"],"attestation":{"schema":"https://councilof.ai/schema/card-v0.json","sha256":"<hex>","payload":{"kind":"csoai.population.slice/0.1","rows_sha256":"<hex>"},"surface":"population.slice","sig_ed25519":"<hex or null>"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_UvhMYp-Lbl4r9Xe0VREHu","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a signed, cryptographically attested measurement slice of AI systems in 'layer0' of the CSOAI population estate, including live probe counts and source attestation data.","exampleAgentPrompt":"Pull the latest signed measurement slice for Council of AI's layer0 population — I want the current probe count, the attestation signature, and the source references so I can verify the results independently.","exampleUseCases":[{"title":"Verifying AI benchmark integrity","prompt":"Fetch the signed Council of AI layer0 measurement card for me — I need the ed25519 attestation signature and sha256 hash so I can confirm the benchmark results haven't been tampered with."},{"title":"Monitoring live AI estate probe count","prompt":"How many live probes are currently in the Council of AI layer0 estate? Pull the latest measurement slice and tell me the count and the timestamp it was measured at."},{"title":"Auditing AI system behavior evidence","prompt":"Get me the Council of AI layer0 population slice including the source artifact paths and the settlement transaction info — I'm auditing the evidence trail for our compliance report."}],"resultDescription":"A JSON object containing: the number of live probes (n), the slice ID ('layer0'), kind, verbatim population rows, measurement timestamp (as_of), state ('MEASURED'), unit description, schema version, settlement info (payer, network, transaction), source artifact URLs, and a full attestation block with schema URL, sha256, payload, surface label, and an ed25519 signature (or null if unsigned).","failureModes":["Payment not included or insufficient (HTTP 402) — must send 0.01 USDC via x402 protocol","Measurement not yet settled — state may be pending rather than MEASURED","Signature field null — supporting run rather than a fully signed card","Source artifacts unavailable — /interop paths may not resolve","Stale data — as_of timestamp may lag if ceremony has not run recently"],"whenToPreferThis":"Choose this endpoint when you need machine-verifiable, cryptographically signed evidence of how AI systems behave on frozen published tests — specifically for the layer0 population slice. Prefer it over general AI leaderboards when auditability, non-repudiation, and independent re-verification of results are required. The ed25519 attestation and sha256 hashes allow any third party to re-check the measurement without trusting the issuer.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T02:16:27.765Z","isFirstParty":false,"canonicalSlug":"council-of-ai-population-layer-0-slice-15fa365f"}