# Council of AI — Corrections Ledger Endpoint

> Council of AI — Corrections Ledger Endpoint is a paid API for AI agents from councilof.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Returns the signed, verifiable corrections ledger for AI measurement cards published by Council of AI, including attestation metadata and settlement provenance.

## Facts

- Endpoint: GET https://councilof.ai/api/pop/corrections?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/council-of-ai-corrections-ledger-endpoint-45eeba03
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VKG32JttPcvl40sfdv-Ca

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability council-of-ai-corrections-ledger-endpoint-45eeba03
```

Example prompt: Pull the latest corrections ledger from Council of AI so I can see which AI measurement results have been officially corrected, along with the signed attestation proving the data hasn't been tampered with.

## When to prefer this

Use this endpoint when you need cryptographically verifiable, signed evidence of corrections to AI measurement results from Council of AI — specifically when auditability and tamper-evidence matter. Prefer this over generic web scraping of the corrections ledger when you need machine-readable structured data with attestation. Ideal for compliance, audit trails, or agent workflows that must verify no benchmark results have been silently altered.

## Known failure modes

- Payment not received or insufficient USDC — returns 402 Payment Required
- Invalid HTTP method (non-GET/HEAD/DELETE) — request rejected by schema validation
- Ledger temporarily unavailable or indexing in progress — state may not be INDEXED
- Attestation signature may be null if the slice is unsigned (labelled as supporting run only)
- Network or settlement verification failure — transaction hash may be null in settle block

## How this service works

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.

## Output

A JSON object containing the full corrections ledger slice with: total correction entry count (n), ledger state (INDEXED), as-of date, raw ledger rows (verbatim artifact bytes), source file references, settlement provenance (payer address, network, transaction hash), and a signed attestation block with ed25519 signature and SHA-256 hashes conforming to the csoai.population-door/0.1 schema.

## Request schema (JSON Schema)

```json
{
 "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"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "n": 76,
  "id": "corrections",
  "kind": "slice",
  "rows": "<the population rows / artifact bytes, verbatim>",
  "as_of": "2026-09-27",
  "state": "INDEXED",
  "n_unit": "correction entries in the source-maintained ledger",
  "schema": "csoai.population-door/0.1",
  "settle": {
   "payer": "<0x… or null>",
   "network": "<caip2 or null>",
   "transaction": "<0x… or null>"
  },
  "source": [
   "functions/api/corrections.ts#LEDGER",
   "/api/corrections"
  ],
  "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>"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/council-of-ai-corrections-ledger-endpoint-45eeba03/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from councilof.ai](https://www.zero.xyz/host/councilof.ai/llms.txt)