# Council of AI Signed Data Feed

> Council of AI Signed Data Feed is a paid API for AI agents from councilof.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).

Returns a signed, cryptographically verifiable feed of AI system measurement results, including benchmark cards, signal blocks, and a corrections ledger.

## Facts

- Endpoint: GET https://councilof.ai/api/signed-data-feed?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/council-of-ai-signed-data-feed-1a22dae7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WHNtB_HjJJuzz3DQNUOur

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-signed-data-feed-1a22dae7
```

Example prompt: Pull the latest signed data feed from Council of AI so I can see the current measurement cards, signal blocks, and any corrections logged for AI system evaluations.

## When to prefer this

Choose this endpoint when you need independently signed, cryptographically verifiable evidence of AI system behavior — not self-reported vendor benchmarks. It is the right choice for compliance auditing, fact-checking AI capability claims, or monitoring the corrections ledger for revised evaluations. Prefer it over generic leaderboards when tamper-evidence and checkable provenance matter.

## Known failure modes

- Payment not provided or insufficient USDC — HTTP 402 returned
- Endpoint unavailable or feed generation failure — HTTP 5xx returned
- Schema version mismatch if client expects a different csoai.signed-data-feed version
- Signature verification failure on client side if signing keys are not up to date
- Empty or incomplete blocks if no new measurements have been published

## 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 feed (schema csoai.signed-data-feed/0.2) containing a root block, signal blocks, a card index, and first-fine-watch events. Measurement cards within the feed are cryptographically signed; supporting runs are labelled as unsigned. The feed represents the live state of AI system benchmarks as independently measured and published by Council of AI.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "kind": "feed",
  "blocks": {
   "root": {},
   "signals": {},
   "card_index": {},
   "first_fine_watch": {}
  },
  "schema": "csoai.signed-data-feed/0.2"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/council-of-ai-signed-data-feed-1a22dae7/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)